2007-12-31 Tracking News

Contents on 31 December '07

IAU Minor Planet Center
- NEOCP Activity -- 15 listings: 8 new, 7 updated
- New MPECs -- six MPECs
- Observers -- 52 observing facilities
Impact Risk Monitoring -- three objects
Chronology

Resources:

Consolidated Risk Tables - the CRT page
Earth's Busy Neighborhood Traffic Report
Ephemerides for risk-rated and nearby objects
Old & new CRT Archive
Old News Archive & Small Objects Archive

The latest A/CC news is available via framed access, RSS news feed, or redirection. - Note: A/CC has a main Web site and also a backup site with its own duplicate RSS news feed.

Navigation tips: Use the << and >> arrows on the menus for each regular section (Observers, Risks, etc.) to move to the previous and next day's news for that section. Use the Index menu item to access specific days this year through a calendar interface. And use the all-up news archive to access news from any time since A/CC began in early 2002. To keep track of what's new each day, watch the Chronology section.

NEOCP Activity on 31 December '07

The MPC's NEO Confirmation Page has 15 listings: 8 new, 7 updated

When last checked at 2354 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had eight new and seven updated listings. Of these, eight were "one nighters." The Tracking News counted a total of eighteen objects listed on the NEOCP at some point on this day.

New MPECs on 31 December '07

Minor Planet Electronic Circulars

As of last check at 2354 UTC, there were six MPECs issued this day from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2007-Y56 time-stamped "02:56 UT" - Comet C/2007 W1 (Boattini) - see below
MPEC 2007-Y57 time-stamped "02:59 UT" - Comet C/2007 W3 (LINEAR) - see below
MPEC 2007-Y58 time-stamped "03:02 UT" - Comet C/2007 Y1 (LINEAR) - see below
MPEC 2007-Y59 time-stamped "03:11 UT" - Observations of Comets - see below
MPEC 2007-Y60 time-stamped "07:07 UT" - Daily Orbit Update - see below
MPEC 2007-Y61 time-stamped "12:49 UT" - 2006 SU131

MPEC 2007-Y61 - "12:49 UT" - 2006 SU131

K06SD1U 2006 SU131 (H=18.7 ~616m) from the Spacewatch 1.8m telescope (Dec. 15.41-44p3 & 31.39-40p2 at V=22.6)

<< DOU on 31 Dec. '07 >> MPEC 2007-Y60 - "07:07 UT" - Daily Orbit Update

Observations of risk-listed objects
K07Y02B 2007 YB2 (Q=4.926 AU, arc=13 days, H=18.3 ~741m) from Spacewatch 1.8m (Dec. 30.35-36p2) and Paus Obs. (Dec. 31.08p1)
K07X11K 2007 XK11 (Q=4.511 AU, arc=24 days, H=19.2 ~490m) from Spacewatch 1.8m (Dec. 30.21-22p3)
Observations of recently (no longer) risk-listed objects
K07Y00Z 2007 YZ (arc=13 days, H=19.8 ~371m) from the Catalina Sky Survey (CSS) (Dec. 30.41-48p7), Petit Jean Mtn. South Obs. (PJMSO) (Dec. 30.42p7), and Begues Obs. (Dec. 30.85p3)
K07Y00G 2007 YG (small asteroid, arc=14 days, H=23.1 ~81m) from Spacewatch 1.8m (Dec. 30.30p3 at V=22.9)
Observations of other objects
K07Y01X 2007 YX1 (Q=4.542 AU, arc=2 opp, H=17.2 ~1.23 km) from Begues Obs. (Dec. 30.79p3)
K07X20J 2007 XJ20 (arc=17 days, H=18.4 ~708m) from Desert Moon Obs. (Dec. 30.17-21p3)
K07X16H 2007 XH16 (arc=21 days, H=19.7 ~389m) from Siegen Obs. (Dec. 21.97p3) and Stia Obs. (Dec. 27.70p5)
K07W55F 2007 WF55 (arc=29 days, H=19.1 ~513m) from Frasso Sabino Obs. (Dec. 29.79-80p2)
K07W03V 2007 WV3 (arc=42 days, H=19.7 ~389m) from Desert Moon Obs. (Dec. 30.24-28p3)
K07VO3O 2007 VO243 (arc=45 days, H=19.4 ~446m) from Spacewatch 1.8m (Dec. 30.28-29p3)
K07VO3L 2007 VL243 (i=43.3°, q=0.262 AU, arc=46 days, H=17.8 ~933m) from the Siding Spring Survey (SSS) (Dec. 28.47p1 & 30.45p2)
K07V04Q 2007 VQ4 (arc=57 days, H=15.8 ~2.34 km, q=1.271 AU) from PJMSO (Dec. 30.46-47p6)
K07U51Q 2007 UQ51 (arc=60 days, H=20.2 ~309m) from Spacewatch 1.8m (Dec. 30.27-28p3)
K07U06S 2007 US6 (arc=3 opp, H=18.3 ~741m) from LONEOS (Dec. 30.19-27p4)
K07S06P 2007 SP6 (arc=100 days, H=18.2 ~776m) from Stia Obs. (Dec. 29.75-77p4), PJMSO (Dec. 30.44-45p6), and Begues Obs. (Dec. 30.86-87p3)
K07P27V 2007 PV27 (arc=138 days, H=20.2 ~309m) from Spacewatch 1.8m (Dec. 30.54-55p2)
K07L00S 2007 LS (Q=4.532 AU, arc=2 opp, H=17.8 ~933m) from Desert Moon Obs. (Dec. 30.06-08p3)
K06B07T 2006 BT7 (arc=3 opp, H=18.4 ~708m) from Spacewatch 1.8m (Dec. 30.39-40p3 at V=22.3)
K05X08K 2005 XK8 (arc=2 opp, H=19.7 ~389m) from Stia Obs. (Dec. 29.73-74p5)
K05X01D 2005 XD1 (arc=2 opp, H=19.2 ~490m) from Stia Obs. (Dec. 29.70-71p5), Frasso Sabino Obs. (Dec. 29.80-81p4), and San Vito Obs. (Dec. 29.95-96p3)
K05W56J 2005 WJ56 (arc=3 opp, H=17.9 ~891m) from PJMSO (Dec. 30.45-46p7)
K05W02R 2005 WR2 (arc=3 opp, H=19.3 ~467m) from the Spacewatch 0.9m telescope (Dec. 30.24-27p3)
K05T45U 2005 TU45 (arc=3 opp, H=17.0 ~1.35 km) from PJMSO (Dec. 30.43p5)
K04X60Y 2004 XY60 (q=0.130 AU, arc=3 opp, H=19.0 ~537m) from SSS (Dec. 28.52p2)
K03Q90B 2003 QB90 (arc=3 opp, H=18.1 ~812m) from Spacewatch 1.8m (Dec. 30.42-43p3)
K03B84H 2003 BH84 (arc=2 opp, H=16.9 ~1.41 km) from Stia Obs. (Dec. 29.79-81p5)
K03B35T 2003 BT35 (i=57.3°, arc=3 opp, H=18.7 ~616m) from Desert Moon Obs. (Dec. 30.32-34p3)
K00C59H 2000 CH59 (arc=3 opp, H=19.7 ~389m) from PJMSO (Dec. 30.47-48p5)
J98Y04M 1998 YM4 (arc=2 opp, H=19.7 ~389m) from the Mt. Lemmon Survey (MLS) (Dec. 30.30-31p4)
G2058 162058 1997 AE12 from MLS (Dec. 30.40-44p4 at V=22.1)
F4347 154347 2002 XK4 from PJMSO (Dec. 30.48p5)
F3591 153591 2001 SN263 from Balzaretto Obs. (Dec. 29.92-93p3)
99935 99935 2002 AV4 from Siegen Obs. (Dec. 21.79p3)
96189 96189 1991 NT3 from CSS (Dec. 30.48-50p4)
86324 86324 1999 WA2 from Siegen Obs. (Dec. 18.89-90p3 & 21.77p3)
68359 68359 2001 OZ13 from San Vito Obs. (Dec. 29.96-97p3)
68063 68063 2000 YJ66 from MLS (Dec. 30.24-26p4) and CSS (Dec. 30.33-35p4)
66407 66407 1999 LQ28 from PJMSO (Dec. 30.49p5)
34613 34613 2000 UR13 from CSS (Dec. 30.33-35p4)
18736 18736 1998 NU from CSS (Dec. 30.20-22p4)
04954 4954 Eric (1990 SQ) from Siegen Obs. (Dec. 18.91p3 & 21.78p3)
04450 4450 Pan (1987 SY) from CSS (Dec. 30.51-53p4)
01620 1620 Geographos (1951 RA) from PJMSO (Dec. 30.49-50p5)

MPEC 2007-Y59 - "03:11 UT" - Observations of Comets

CK07U010 C/2007 U1 (LINEAR) from Ageo Obs. (Dec. 18.72p3), CSS (Dec. 20.26-32p11), Montana Blanca Obs. (Dec. 26.90p1), Paus Obs. (Dec. 27.89p2 & 30.88-89p2), LINEAR (Dec. 28.39-44p5), Buchloe Obs. (Dec. 29.77-78p3), and Begues Obs. (Dec. 30.94p3)
PK07T060 P/2007 T6 (Catalina) from Montcabre Obs. (Dec. 24.96p2 & 29.08-13p3)
CK07T050 C/2007 T5 (Gibbs) from Montcabre Obs. (Dec. 28.00p2) and CSS (Dec. 30.45-46p4)
PK07R040 P/2007 R4 (Garradd) from Ageo Obs. (Nov. 17.64p2 & Dec. 16.53p2), Buchloe Obs. (Nov. 28.77p1 & Dec. 29.77p1), KLENOT (Dec. 29.80p4), and Kambah Obs. (Dec. 30.56-57p2)
CK07Q030 C/2007 Q3 (Siding Spring) from North Ryde Obs. (Dec. 26.48-51p2, 28.52-54p2 & 29.55-57p2) and Kambah Obs. (Dec. 26.59-60p2, 29.52-53p2 & 30.46-47p2)
PK07H010 P/2007 H1 (McNaught) from Kambah Obs. (Dec. 4.59-60p2), Montcabre Obs. (Dec. 24.75p3), Vicksburg Obs. (Dec. 26.10-11p2), Hiratsuka Obs. (Dec. 26.41-42p2), Chante-Perdrix Obs. (Dec. 27.76-80p3), La Murta Obs. (Dec. 27.80p3), and CAST Obs. (Dec. 27.83p1)
CK07E010 C/2007 E1 (Garradd) from Ageo Obs. (Dec. 16.64p2) and La Vara Obs. (Dec. 27.88p1)
CK07D030 C/2007 D3 (LINEAR) from Schiaparelli Obs. (Dec. 19.11p1 & 19.18p1) and Kambah Obs. (Dec. 28.61-63p2 & 29.69-70p2)
PK07C020 P/2007 C2 (Catalina) from Capannoli Obs. (Dec. 29.01p1), Spacewatch 0.9m (Dec. 30.30-33p3), CSS (Dec. 30.42-44p4), and LINEAR (Dec. 30.45-50p5)
CK07B020 C/2007 B2 (Skiff) from LINEAR (Dec. 18.46-51p5) and Monte Deva Obs. (Dec. 28.09-10p4)
CK06W030 C/2006 W3 (Christensen) from Ageo Obs. (Dec. 20.76-77p3), La Vara Obs. (Dec. 26.93-94p4 & 27.93-94p3), Montcabre Obs. (Dec. 27.95-96p3), Iluro Obs. (Dec. 28.91p3), and Buchloe Obs. (Dec. 29.76p3)
CK06U060 C/2006 U6 (Spacewatch) from Kambah Obs. (Dec. 7.47-48p2, 29.57p2 & 30.48p2) and North Ryde Obs. (Dec. 26.44-46p2 & 29.50-52p2)
CK06S050 C/2006 S5 (Hill) from Kitami Obs. (Dec. 8.62-63p3), Siegen Obs. (Dec. 18.96-97p3), AAAA Buenos Aires Obs. (Dec. 20.28-31p2), CAST Obs. (Dec. 27.86p1 & 28.90p1), Monte Deva Obs. (Dec. 28.08-09p5), Capannoli Obs. (Dec. 28.99-00p2), Mataro Obs. (Dec. 28.00-01p3), Iluro Obs. (Dec. 29.07p3), Buchloe Obs. (Dec. 29.81p3), and CSS (Dec. 30.42-44p4)
CK06Q010 C/2006 Q1 (McNaught) from AAAA Buenos Aires Obs. (Dec. 20.18-27p5), CEAMIG-REA (Dec. 28.25-29p4), North Ryde Obs. (Dec. 28.58-60p2), and Kambah Obs. (Dec. 28.64p2 & 29.59p2)
CK06O02F C/2006 OF2 (Broughton) from Herne Obs. (Dec. 21.76p1), La Vara Obs. (Dec. 26.81-82p3 & 27.82-83p2), and CAST Obs. (Dec. 28.73p1)
CK06M010 C/2006 M1 (LINEAR) from La Murta Obs. (Dec. 27.87-88p3) and LINEAR (Dec. 30.19-24p4)
CK06K010 C/2006 K1 (McNaught) from Vicksburg Obs. (Dec. 26.14-15p2), North Ryde Obs. (Dec. 26.53p1, 28.48-50p2 & 29.46-48p2), Kambah Obs. (Dec. 26.54p2 & 30.51p2), and Buchloe Obs. (Dec. 29.79p3)
CK05EH3L C/2005 EL173 (LONEOS) from Ageo Obs. (Dec. 16.48-49p2), Kambah Obs. (Dec. 26.56-57p2 & 30.49-50p2), and North Ryde Obs. (Dec. 30.45-48p2)
0195P 195P/Hill from Montcabre Obs. (Dec. 26.96-97p3) and LINEAR (Dec. 28.38-41p3)
0192P 192P/Shoemaker-Levy 1 from Ageo Obs. (Dec. 24.39p3), Hiratsuka Obs. (Dec. 26.38-39p3), Chante-Perdrix Obs. (Dec. 28.75-77p3), and Buchloe Obs. (Dec. 29.73p2)
0191P 191P/McNaught from La Vara Obs. (Dec. 27.89-90p3), LINEAR (Dec. 28.26-31p5), and Posadas Obs. (Dec. 29.94-95p3)
0190P 190P/Mueller from Ageo Obs. (Dec. 17.69-70p2 & 20.72-73p3), Chante-Perdrix Obs. (Dec. 28.80-81p3), and Begues Obs. (Dec. 30.90p1)
0173P 173P/Mueller 5 from Capannoli Obs. (Dec. 28.99-02p2) and CSS (Dec. 30.33p2)
0128P 128P/Shoemaker-Holt 1 from Schiaparelli Obs. (Dec. 21.09p1 & 21.18p1), CAST Obs. (Dec. 27.86p1), and LINEAR (Dec. 30.39-44p5)
0116P 116P/Wild 4 from Chante-Perdrix Obs. (Dec. 27.87-90p3) and Buchloe Obs. (Dec. 29.79-80p3)
0110P 110P/Hartley 3 from Kitami Obs. (Dec. 8.59-60p3), Ageo Obs. (Dec. 24.53p3), Montcabre Obs. (Dec. 25.93-95p3 & 28.97-98p3), La Murta Obs. (Dec. 27.84-85p3), CAST Obs. (Dec. 27.85p1 & 28.81p1), El Olivo Obs. (Dec. 27.91-92p3), La Vara Obs. (Dec. 27.99-01p3 & 28.91-92p3), Mataro Obs. (Dec. 28.86-87p2 & 28.95-96p2), Nazaret Obs. (Dec. 28.90-91p3), Buchloe Obs. (Dec. 29.80p3), and Carmelita Obs. (Dec. 30.76p3)
0093P 93P/Lovas 1 from La Vara Obs. (Nov. 25.02p3, Dec. 26.88p3 & 27.91p3), Herne Obs. (Dec. 17.87p1 & 21.82-83p2), Siegen Obs. (Dec. 18.92p2 & 21.81-82p3), Gualba Obs. (Dec. 24.75p2 & 26.99p1), Carmelita Obs. (Dec. 25.89-90p3 & 30.72-73p3), Hamamatsu-Yuto Obs. (Dec. 26.48p3), CAST Obs. (Dec. 27.84p1 & 28.82p1), Monte Deva Obs. (Dec. 27.93-95p5), El Olivo Obs. (Dec. 27.94-96p3), Mataro Obs. (Dec. 28.77-78p3), Montcabre Obs. (Dec. 28.93-94p3), and Posadas Obs. (Dec. 29.89-90p3)
0079P 79P/du Toit-Hartley from Spacewatch 0.9m (Dec. 28.40-44p3) and CSS (Dec. 30.33-35p4)
0074P 74P/Smirnova-Chernykh from Montcabre Obs. (Dec. 24.92-93p3), Vicksburg Obs. (Dec. 26.18-19p2), Tenagra II Obs. (Dec. 26.37-39p3), La Murta Obs. (Dec. 27.92-93p3), Spacewatch 0.9m (Dec. 28.16-21p3), Mataro Obs. (Dec. 28.88-89p3), Nazaret Obs. (Dec. 28.91-94p3), and San Vito Obs. (Dec. 29.94-95p2)
0050P 50P/Arend from Herne Obs. (Dec. 17.84p1), Siegen Obs. (Dec. 18.92-93p3 & 21.84-85p3), Vicksburg Obs. (Dec. 26.12p2), Gualba Obs. (Dec. 26.99p1), Carmelita Obs. (Dec. 27.82p3), CAST Obs. (Dec. 27.84p1 & 28.82p1), La Murta Obs. (Dec. 27.88-89p3), La Vara Obs. (Dec. 27.97-98p3), Mataro Obs. (Dec. 28.82-84p3), El Olivo Obs. (Dec. 28.84-86p3), and Capannoli Obs. (Dec. 28.97p2)
0046P 46P/Wirtanen from Ageo Obs. (Dec. 9.46-47p3 & 16.38p2), Herne Obs. (Dec. 21.78p1), Montcabre Obs. (Dec. 24.74p3), Linceo Obs. (Dec. 24.74-76p3, 26.74-76p3 & 27.74-76p3), Vicksburg Obs. (Dec. 26.02p2), Hiratsuka Obs. (Dec. 26.40p3), La Vara Obs. (Dec. 26.78p3 & 27.81-82p3), La Murta Obs. (Dec. 27.81p3), and CAST Obs. (Dec. 28.73p1)
0029P 29P/Schwassmann-Wachmann 1 from Gualba Obs. (Dec. 24.96p1, 25.88p1 & 26.96p3), Montcabre Obs. (Dec. 25.89-90p3, 27.84-85p3, 29.91-93p3 & 30.75-76p3), Vicksburg Obs. (Dec. 26.22p2), Chante-Perdrix Obs. (Dec. 26.79-82p3), El Olivo Obs. (Dec. 27.81-82p3), La Murta Obs. (Dec. 27.83-84p3), CAST Obs. (Dec. 27.85p1 & 28.80p1), Montana Blanca Obs. (Dec. 28.83-84p3, 29.94-98p3 & 30.83p3), Nazaret Obs. (Dec. 28.87-89p3), La Vara Obs. (Dec. 28.94-95p3), Mataro Obs. (Dec. 28.97-99p3), Casal Lumbroso Obs. (Dec. 29.99-00p4), Carmelita Obs. (Dec. 30.74-75p3), and Begues Obs. (Dec. 30.83-84p2)
0017P 17P/Holmes from Herne Obs. (Dec. 16.76p2, 17.72-74p2 & 28.76-77p2), Ageo Obs. (Dec. 17.68p2), Hamamatsu-Yuto Obs. (Dec. 19.47-48p3, 20.50-51p5, 26.40-43p3 & 27.39-40p3), Siegen Obs. (Dec. 21.93p2), Chante-Perdrix Obs. (Dec. 24.75-76p3, 25.74-75p3, 26.74-75p2, 27.74-75p3 & 28.79p3), El Olivo Obs. (Dec. 24.76-77p3, 26.82p3 & 27.77-79p3), Gualba Obs. (Dec. 24.77p3, 25.87p3 & 26.98p3), Montcabre Obs. (Dec. 24.90-91p3, 25.87-88p3, 26.90-91p3, 27.93-94p3, 28.84p3, 29.85p3 & 30.86-87p3), Nazaret Obs. (Dec. 25.88-89p2 & 28.84-85p3), La Vara Obs. (Dec. 26.83-84p3, 27.95-96p3 & 28.86-89p4), Carmelita Obs. (Dec. 26.89p3, 27.89p3 & 30.83-84p3), CAST Obs. (Dec. 27.85p1 & 28.81p1), La Murta Obs. (Dec. 27.90-91p3), CEAMIG-REA (Dec. 27.98-99p2), Monte Deva Obs. (Dec. 28.06-07p5), Green Island Obs. (Dec. 28.67p1, 28.74p1 & 28.78p1), Mataro Obs. (Dec. 28.80-81p3), Iturrieta Obs. (Dec. 28.82-83p3), PJMSO (Dec. 29.01-04p8 & 29.99-03p8), and Buchloe Obs. (Dec. 29.75p3)
0008P 8P/Tuttle from Herne Obs. (Dec. 17.81-83p2, 21.85-88p2 & 28.84p1), Siegen Obs. (Dec. 18.87p3 & 21.99p3), Hamamatsu-Yuto Obs. (Dec. 19.39p2, 20.37p4, 26.38-39p6 & 27.36-37p7), Ageo Obs. (Dec. 24.57p3), Gualba Obs. (Dec. 24.76p3, 25.86p3 & 26.97p3), Montana Blanca Obs. (Dec. 24.81-83p3 & 28.85p3), Montcabre Obs. (Dec. 24.85-89p3, 25.86p3, 26.93p3, 27.86-92p3, 28.88-89p3, 29.86p3 & 30.87p3), Chante-Perdrix Obs. (Dec. 25.73-74p3, 26.73-74p3, 27.73-74p3 & 28.77-78p3), Vega del Thader Obs. (Dec. 25.80p11 & 27.81-82p6), Carmelita Obs. (Dec. 25.87p3, 26.84p3, 27.79-80p3 & 30.73p3), Nazaret Obs. (Dec. 25.90p2 & 28.86-87p3), La Vara Obs. (Dec. 26.92p3, 27.92p3 & 28.89-90p3), CAST Obs. (Dec. 27.80p1 & 28.75p1), El Olivo Obs. (Dec. 27.85-86p3), La Murta Obs. (Dec. 27.89p3), Monte Deva Obs. (Dec. 27.95-96p5), Mataro Obs. (Dec. 28.78-79p3), Iturrieta Obs. (Dec. 28.99-01p3), Buchloe Obs. (Dec. 29.74p5), Balzaretto Obs. (Dec. 29.84-86p5), and Gretz-Armainvilliers Obs. (Dec. 29.85p3)

MPEC 2007-Y58 - "03:02 UT" - Comet C/2007 Y1 (LINEAR)

CK07Y010 C/2007 Y1 (LINEAR) (i=110.2°, q=3.340 AU, TP=2008 Mar. 19.460 TT) from Montcabre Obs. (Dec. 25.06p1 & 25.13-17p2), Nazaret Obs. (Dec. 25.11-13p3), and North Ryde Obs. (Dec. 28.62-65p2 & 29.62-64p2)

MPEC 2007-Y57 - "02:59 UT" - Comet C/2007 W3 (LINEAR)

CK07W030 C/2007 W3 (LINEAR) (i=78.7°, q=1.776 AU, TP=2008 June 2.8028 TT) from LINEAR (Dec. 28.13-17p4), Buchloe Obs. (Dec. 29.75-76p3), and Frasso Sabino Obs. (Dec. 29.77p1)

MPEC 2007-Y56 - "02:56 UT" - Comet C/2007 W1 (Boattini)

CK07W010 C/2007 W1 (Boattini) (i=9.9°, q=0.850 AU, TP=2008 June 24.8897 TT) from RAS Obs. Mayhill (Dec. 27.50-51p2), Montcabre Obs. (Dec. 28.23-25p3), North Ryde Obs. (Dec. 28.68-69p2), and Kambah Obs. (Dec. 29.71-72p4)

Observers on 31 December '07

A total of 52 observing facilities appeared in this day's MPECs.

Code	Observer / observatory
`834`	AAAA Buenos Aires Obs. in Argentina, 2 in MPEC 2007-Y59 -- C/2006 S5, C/2006 Q1
`349`	Ageo Obs. in Japan, 11 in MPEC 2007-Y59 -- C/2007 U1, P/2007 R4, C/2007 E1, C/2006 W3, C/2005 EL173, 192P, 190P, 110P, 46P, 17P, 8P
`A81`	Balzaretto Obs. in Italy, 2 in MPECs 2007-Y59 & 2007-Y60 -- 153591, 8P
`170`	Begues Obs. in Spain, 6 in MPECs 2007-Y59 & 2007-Y60 -- 2007 YZ, 2007 YX1, C/2007 U1, 2007 SP6, 190P, 29P
`215`	Buchloe Obs. in Germany, 11 in MPECs 2007-Y57 & 2007-Y59 -- C/2007 W3, C/2007 U1, P/2007 R4, C/2006 W3, C/2006 S5, C/2006 K1, 192P, 116P, 110P, 17P, 8P
`235`	CAST Obs. in Italy, 11 in MPEC 2007-Y59 -- P/2007 H1, C/2006 S5, C/2006 OF2, 128P, 110P, 93P, 50P, 46P, 29P, 17P, 8P
`I77`	CEAMIG-REA in Brazil, 2 in MPEC 2007-Y59 -- C/2006 Q1, 17P
`B09`	Capannoli Obs. in Italy, 4 in MPEC 2007-Y59 -- P/2007 C2, C/2006 S5, 173P, 50P
`B20`	Carmelita Obs. in Spain, 6 in MPEC 2007-Y59 -- 110P, 93P, 50P, 29P, 17P, 8P
`B53`	Casal Lumbroso Obs., 1 in MPEC 2007-Y59 -- 29P
`703`	Catalina Sky Survey (CSS) in Arizona, 12 in MPECs 2007-Y59 & 2007-Y60 -- 2007 YZ, C/2007 U1, C/2007 T5, P/2007 C2, C/2006 S5, 96189, 68063, 34613, 18736, 4450, 173P, 79P
`A77`	Chante-Perdrix Obs. in France, 7 in MPEC 2007-Y59 -- P/2007 H1, 192P, 190P, 116P, 29P, 17P, 8P
`448`	Desert Moon Obs. in New Mexico, 4 in MPEC 2007-Y60 -- 2007 XJ20, 2007 WV3, 2007 LS, 2003 BT35
`J36`	El Olivo Obs. in Spain, 6 in MPEC 2007-Y59 -- 110P, 93P, 50P, 29P, 17P, 8P
`157`	Frasso Sabino Obs. in Italy, 3 in MPECs 2007-Y57 & 2007-Y60 -- 2007 WF55, C/2007 W3, 2005 XD1
`B34`	Green Island Obs. in Cyprus, 1 in MPEC 2007-Y59 -- 17P
`A07`	Gretz-Armainvilliers Obs., 1 in MPEC 2007-Y59 -- 8P
`442`	Gualba Obs. in Spain, 5 in MPEC 2007-Y59 -- 93P, 50P, 29P, 17P, 8P
`379`	Hamamatsu-Yuto Obs. in Japan, 3 in MPEC 2007-Y59 -- 93P, 17P, 8P
`A18`	Herne Obs. in Germany, 6 in MPEC 2007-Y59 -- C/2006 OF2, 93P, 50P, 46P, 17P, 8P
`D88`	Hiratsuka Obs., 3 in MPEC 2007-Y59 -- P/2007 H1, 192P, 46P
`B19`	Iluro Obs. in Spain, 2 in MPEC 2007-Y59 -- C/2006 W3, C/2006 S5
`J44`	Iturrieta Obs. in Spain, 2 in MPEC 2007-Y59 -- 17P, 8P
`246`	KLENOT in the Czech Republic, 1 in MPEC 2007-Y59 -- P/2007 R4
`415`	Kambah Obs. in Australia, 9 in MPECs 2007-Y56 & 2007-Y59 -- C/2007 W1, P/2007 R4, C/2007 Q3, P/2007 H1, C/2007 D3, C/2006 U6, C/2006 Q1, C/2006 K1, C/2005 EL173
`400`	Kitami Obs. in Japan, 2 in MPEC 2007-Y59 -- C/2006 S5, 110P
`704`	LINEAR in New Mexico, 8 in MPECs 2007-Y57 & 2007-Y59 -- C/2007 W3, C/2007 U1, P/2007 C2, C/2007 B2, C/2006 M1, 195P, 191P, 128P
`699`	LONEOS in Arizona, 1 in MPEC 2007-Y60 -- 2007 US6
`J76`	La Murta Obs. in Spain, 9 in MPEC 2007-Y59 -- P/2007 H1, C/2006 M1, 110P, 74P, 50P, 46P, 29P, 17P, 8P
`J38`	La Vara Obs. in Spain, 11 in MPEC 2007-Y59 -- C/2007 E1, C/2006 W3, C/2006 OF2, 191P, 110P, 93P, 50P, 46P, 29P, 17P, 8P
`J59`	Linceo Obs. in Spain, 1 in MPEC 2007-Y59 -- 46P
`A06`	Mataro Obs. in Spain, 8 in MPEC 2007-Y59 -- C/2006 S5, 110P, 93P, 74P, 50P, 29P, 17P, 8P
`J46`	Montana Blanca Obs. in the Canary Islands, 3 in MPEC 2007-Y59 -- C/2007 U1, 29P, 8P
`213`	Montcabre Obs. in Spain, 14 in MPECs 2007-Y56, 2007-Y58 & 2007-Y59 -- C/2007 Y1, C/2007 W1, P/2007 T6, C/2007 T5, P/2007 H1, C/2006 W3, 195P, 110P, 93P, 74P, 46P, 29P, 17P, 8P
`945`	Monte Deva Obs. in Spain, 5 in MPEC 2007-Y59 -- C/2007 B2, C/2006 S5, 93P, 17P, 8P
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 3 in MPEC 2007-Y60 -- 1998 YM4, 68063, 162058
`J47`	Nazaret Obs. in Spain, 6 in MPECs 2007-Y58 & 2007-Y59 -- C/2007 Y1, 110P, 74P, 29P, 17P, 8P
`423`	North Ryde Obs. in New South Wales, 7 in MPECs 2007-Y56, 2007-Y58 & 2007-Y59 -- C/2007 Y1, C/2007 W1, C/2007 Q3, C/2006 U6, C/2006 Q1, C/2006 K1, C/2005 EL173
`B49`	Paus Obs. in Spain, 2 in MPECs 2007-Y59 & 2007-Y60 -- 2007 YB2, C/2007 U1
`H45`	Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 10 in MPECs 2007-Y59 & 2007-Y60 -- 2007 YZ, 2007 VQ4, 2007 SP6, 2005 WJ56, 2005 TU45, 2000 CH59, 66407, 154347, 1620, 17P
`J53`	Posadas Obs. in Spain, 2 in MPEC 2007-Y59 -- 191P, 93P
`H06`	RAS Obs. Mayhill in New Mexico, 1 in MPEC 2007-Y56 -- C/2007 W1
`233`	San Vito Obs. in Italy, 3 in MPECs 2007-Y59 & 2007-Y60 -- 2005 XD1, 68359, 74P
`204`	Schiaparelli Obs. in Italy, 2 in MPEC 2007-Y59 -- C/2007 D3, 128P
`E12`	Siding Spring Survey (SSS) in New South Wales, 2 in MPEC 2007-Y60 -- 2007 VL243, 2004 XY60
`510`	Siegen Obs. in Germany, 9 in MPECs 2007-Y59 & 2007-Y60 -- 2007 XH16, C/2006 S5, 99935, 86324, 4954, 93P, 50P, 17P, 8P
`691`	Spacewatch 0.9m telescope in Arizona, 4 in MPECs 2007-Y59 & 2007-Y60 -- P/2007 C2, 2005 WR2, 79P, 74P
`291`	Spacewatch 1.8m telescope in Arizona, 9 in MPECs 2007-Y60 & 2007-Y61 -- 2007 YG, 2007 YB2, 2007 XK11, 2007 VO243, 2007 UQ51, 2007 PV27, 2006 SU131, 2006 BT7, 2003 QB90
`A78`	Stia Obs. in Italy, 5 in MPEC 2007-Y60 -- 2007 XH16, 2007 SP6, 2005 XK8, 2005 XD1, 2003 BH84
`926`	Tenagra II Obs. in Arizona, 1 in MPEC 2007-Y59 -- 74P
`J70`	Vega del Thader Obs. in Spain, 1 in MPEC 2007-Y59 -- 8P
`H47`	Vicksburg Obs. in Mississippi, 6 in MPEC 2007-Y59 -- P/2007 H1, C/2006 K1, 74P, 50P, 46P, 29P

Impact Risk Monitoring on 31 December '07

**Summary Risk Table for Risk Assessments Updated Today** (last checks: NEODyS and JPL at 2354 UTC)
See the CRT page for a list of all objects rated recently as risks.
Note that the time horizon for JPL is 100 years from today and for NEODyS is now usually the year 2090.
For the latest official risk assessments, and for explanations of the terminology, see the JPL NEO Program Sentry and NEODyS CLOMON (backup) risk pages.
0000NNN000 Object	Risk Monitor	When Noted UTC	0000T0000 Year Range	VI #	000NN00 Prob Cum	T0000 PS Cum	T0000 PS Max	T S	Notes for Today's Latest Risk Assessments

2007 YB2	NEODyS	1453	2043	1	4.97e-08	-3.82	-3.82	0	NEODyS: "Based on 55 optical observations (of which 0 are rejected as outliers) from 2007/12/18.346 to 2007/12/31.081."
2007 YB2	JPL Sentry	1452	2043-2098	2	4.8e-08	-3.84	-3.86	0	JPL: "Analysis based on 55 observations spanning 12.735 days (2007-Dec-18.34552 to 2007-Dec-31.08035)." Diameter approximately 0.770 km. from mean, weighted H=18.2.

2007 YG1	NEODyS	1451	R E M O V E D

2007 XK11	JPL Sentry	1452	R E M O V E D						JPL: Risk listing removed at 1121 UTC.

Legend: VI# = VI count, Prob Cum = cumulative probability, PS Cum/Max = cumulative/maximum Palermo Scale, TS = Torino Scale

An impact solution, also known as a "virtual impactor" (VI), is not a prediction but rather a possibility derived from a variant orbit calculation that cannot be eliminated yet based on the existing data. Elimination can come quickly with just a little further observation or may take weeks or months, sometimes years. Once superceded or eliminated, a former impact solution has zero relevance to an object's risk. See Jon Giorgini's "Understanding Risk Pages" to learn more.

Chronology on 31 December '07

Times are UTC for when items were noted or added by The Tracking News.

1453	Grabbed MPEC 2007-Y60 - Daily Orbit Update - see above
1452	Noted that JPL Sentry has removed 2007 XK11 as an impact risk - see above Noted that JPL Sentry has updated its 2007 YB2 risk assessment - see above
1451	Noted that NEODyS has reposted 2007 YB2 as an impact risk - see above Noted that NEODyS has removed 2007 YG1 as an impact risk - see above Grabbed MPEC 2007-Y61 - 2006 SU131 - see above
0517	Grabbed MPEC 2007-Y56 - Comet C/2007 W1 (Boattini) - see above Grabbed MPEC 2007-Y57 - Comet C/2007 W3 (LINEAR) - see above Grabbed MPEC 2007-Y58 - Comet C/2007 Y1 (LINEAR) - see above Grabbed MPEC 2007-Y59 - Observations of Comets - see above

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