Contents  on 24 February '17

Asteroid/Comet Connection (A/CC) Resources:

The latest A/CC news is available via framed access, RSS news feed RSS news feed, or redirection.

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 through a calendar interface. To keep track of what's new each day, watch the Chronology section.

Traffic Report  on 24 February '17

Ten objects reported inside ten LD

Today ten minor objects are reported to be less than ten lunar distances (LD) from our home world. Nearest are two intruders. Risk-listed NHATS target 2017 DG16 moves away from 0.40 to 1.70 LD from Earth while passing the Moon at 0.18 LD at 1150 UTC. And new discovery 2017 DR34 comes in from 3.11 to 0.78 LD, entering Earth's SOI (sphere of gravitational influence) and penetrating the Earth-Moon system.

Further out, newly announced 2017 DT34 comes its closest to Earth this time around, reaching 2.44 LD at 0332 UTC, as does radar/NHATS target 2017 CP1 -- 3.58 LD at 1026 UTC, and 2017 DU34, another discovery, comes its closest, skimming just inside our traffic-reporting zone at 9.99 LD at 0150 UTC, while 2017 DV15 leaves the zone, flying off from 9.84 to 10.65 LD.

Earth passage I D ~Size Distance Today  Notes
0.36 LD yesterday2017 DG16 4 m  0.40 to 1.70 LD NHATS target, intruder today, Moon closest 0.18 LD at 1150 UTC - DOU
0.58 LD tomorrow2017 DR34 5 m  0.78 from 3.11 LD NEW, enters Earth SOI, intruder today - MPEC
1.82 LD Feb. 202017 DB 13 m  6.27 to 8.02 LD NHATS target
2.09 LD Feb. 192017 DF 16 m  5.88 to 7.00 LD NHATS target
2.37 LD yesterday2017 BY93 81 m  2.40 to 5.25 LD exits Earth SOI, radar target, risk - DOU
2.44 LD today2017 DT34 10 m  2.44 LD NEW, Earth closest at 0332 UTC - MPEC, DOU
3.58 LD today2017 CP1 41 m  3.58 LD radar/NHATS target, Earth closest at 1026 UTC - DOU
4.63 LD Feb. 172017 BW 69 m  8.94 to 9.90 LD radar/NHATS target
8.76 LD Feb. 212017 DV15 31 m  9.84 to 10.65 LD exits ten LD
9.99 LD today2017 DU34 15 m  9.99 LD NEW, exits ten LD, Earth closest at 0150 UTC - MPEC

To the list of other objects known to be on approach, we now add newly announced 2017 DS34, which arrives inside ten LD on February 26th.

This report was updated at 2352 UTC with the recovery of approaching 2012 DR32 (MPEC).
        Your first local flying rocks traffic report was generated at 2124 UTC with six discoveries: 2017 DU34 (MPEC), 2017 DT34 (MPEC, DOU), 2017 DS34 (MPEC),2017 DR34 (MPEC), and already departed 2017 DX34 (MPEC), which passed us at 5.05 LD on February 10th, and 2017 DK34 (MPEC), which went by at 6.16 LD three days later. The recovery of distant and very dim 2012 AP10 (MPEC) was announced early today from December and January observations and now all of its Earth impact solutions have been removed. Today's DOU MPEC has first follow-up for 2017 DG16 and approaching NHATS target 2017 DJ16, and continuing follow-up for 2017 CP1 and outbound risk-listed radar target 2017 BY93.

Approaching (sorted by 10-LD bubble entry date)
4.06 LD Feb. 282017 DJ16 23 m  < 10 LD tomorrow, NHATS target - DOU
7.12 LD Feb. 272017 DS34 24 m  < 10 LD Feb. 26, NEW - MPEC
4.68 LD March 22012 DR32 41 m  < 10 LD Feb. 28 - MPEC
8.34 LD March 161998 SL36 309 m  < 10 LD March 14, radar target
7.63 LD March 262015 TC25 4 m  < 10 LD March 17, radar/NHATS target, risk
4.57 LD April 192014 JO25 812 m  < 10 LD April 18, radar target
7.9   LD May 292017 CS 437 m  < 10 LD May 26, uncertainty +/- 22 mins.



Notes: Ten times the distance to the Moon (ten LD) has no astronomical importance but is a useful boundary for reporting on transient natural objects that approach the actually significant gravitational sphere of influence (SOI), which has a radius of about 2.41 LD from Earth's center. This puts a focus on some of the most important and very best NEO observation work, representative of the much larger NEO discovery and tracking effort. "Distant" is used here to describe an object that has come within ten LD since A/CC began these traffic reports (2007) but is not now so close. Object distances are derived by A/CC from JPL Horizons data. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

NEOCP Activity  on 24 February '17

The MPC's NEO Confirmation Page has 101 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 101 objects listed. Of these, 46 were "one nighters." The Tracking News counted a total of 134 listings on the NEOCP on this day.

New MPECs  on 24 February '17

Minor Planet Electronic Circulars

There were 22 MPECs posted this day from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2017-D59 - "23:21 UT" - 2016 CX247


MPEC 2017-D58 - "23:18 UT" - 2015 MP1


MPEC 2017-D57 - "23:16 UT" - 2003 TK2


MPEC 2017-D56 - "21:50 UT" - 2012 DR32


<< DOU on 24 Feb. '17 >>  MPEC 2017-D55 - "13:05 UT" - Daily Orbit Update


MPEC 2017-D54 - "04:20 UT" - 2017 DQ34


MPEC 2017-D53 - "04:16 UT" - 2017 DX34


MPEC 2017-D52 - "04:11 UT" - 2017 DW34


MPEC 2017-D51 - "04:06 UT" - 2017 DV34


MPEC 2017-D50 - "03:54 UT" - 2017 DU34


MPEC 2017-D49 - "03:49 UT" - 2017 DT34


MPEC 2017-D48 - "03:45 UT" - 2017 DS34


MPEC 2017-D47 - "03:40 UT" - 2017 DR34


MPEC 2017-D46 - "03:37 UT" - 2017 DP34


MPEC 2017-D45 - "03:32 UT" - 2017 DO34


MPEC 2017-D44 - "03:28 UT" - 2017 DN34


MPEC 2017-D43 - "03:22 UT" - 2017 DM34


MPEC 2017-D42 - "03:16 UT" - 2017 DL34


MPEC 2017-D41 - "03:11 UT" - 2017 DK34


MPEC 2017-D40 - "03:06 UT" - 2017 DJ34


MPEC 2017-D39 - "03:01 UT" - 2017 CX33


MPEC 2017-D38 - "01:57 UT" - 2012 AP10

Observers  on 24 February '17

A total of 33 observers appeared in this day's MPECs.

CodeObserver / observatory
K82Alphard Obs., 1 in MPEC 2017-D55 -- 2017 CP1
705"Kristie Nault via Apache Point Obs. in New Mexico, 1 in MPEC 2017-D56 -- 2012 DR32
H21Astronomical Research Obs. Westfield in Illinois, 4 in MPEC 2017-D55 -- 2017 BZ5, 2017 AY13, 2016 TD18, 2016 PL1
T05ATLAS Haleakala in Hawaii, 11 in MPEC 2017-D55 -- 2008 CA6, 2004 BD68, 2003 CR1, 2002 LS32, 90075, 413002, 248083, 153951, 138155, 10636, 1036
T08ATLAS Mauna Loa in Hawaii, 5 in MPEC 2017-D55 -- 89830, 40267, 11398, 5693, 4179
300Bisei Spaceguard Center in Japan, 2 in MPECs 2017-D52 & 2017-D53 -- 2017 DX34, 2017 DW34
160Castelmartini Obs. in Italy, 6 in MPEC 2017-D55 -- 2017 DD, 370307, 141018, 3200, 2329, 433
107Cavezzo Obs. in Italy, 1 in MPEC 2017-D55 -- 3103
309&Marco Micheli via Cerro Paranal in Chile, 1 in MPEC 2017-D38 -- 2012 AP10
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2017-D46 -- 2017 DP34
958Dax Obs. in France, 2 in MPECs 2017-D46 & 2017-D49 -- 2017 DT34, 2017 DP34
J04ESA Optical Ground Station in the Canary Islands, 1 in MPEC 2017-D55 -- 2017 CO32
J95Great Shefford Obs. in England, 11 in MPECs 2017-D40, 2017-D43, 2017-D44, 2017-D45, 2017-D46, 2017-D47, 2017-D48, 2017-D49, 2017-D50, 2017-D54 & 2017-D55 -- 2017 DU34, 2017 DT34, 2017 DS34, 2017 DR34, 2017 DQ34, 2017 DP34, 2017 DO34, 2017 DN34, 2017 DM34, 2017 DJ34, 2017 DG16
O75ISON Hureltogoot Obs. in Mongolia, 1 in MPEC 2017-D52 -- 2017 DW34
Q62|Sergio Foglia in Italy via iTelescope Obs. Siding Spring in New South Wales, 3 in MPECs 2017-D46, 2017-D49 & 2017-D55 -- 2017 DT34, 2017 DP34, 2016 SD
950.Ovidiu Vaduvescu via La Palma in the Canary Islands, 1 in MPEC 2017-D57 -- 2003 TK2
W85LCOGT Cerro Tololo A in Chile, 2 in MPECs 2017-D44 & 2017-D55 -- 2017 DN34, 2017 BY93
H01Magdalena Ridge Obs. (MRO) in New Mexico, 10 in MPECs 2017-D41, 2017-D42, 2017-D45, 2017-D46, 2017-D49, 2017-D50, 2017-D54 & 2017-D55 -- 2017 DU34, 2017 DT34, 2017 DQ34, 2017 DP34, 2017 DO34, 2017 DL34, 2017 DK34, 452389, 347813, 7088
W92MASTER OAFA Obs., 1 in MPEC 2017-D55 -- 141056
C94MASTER-II Tunka in Russia, 1 in MPEC 2017-D55 -- 2011 WO41
568_Marco Micheli on Mauna Kea in Hawaii, 4 in MPECs 2017-D39, 2017-D43, 2017-D44 & 2017-D53 -- 2017 DX34, 2017 DN34, 2017 DM34, 2017 CX33
474Mt. John Obs. in New Zealand, 6 in MPECs 2017-D47, 2017-D48, 2017-D49 & 2017-D55 -- 2017 DT34, 2017 DS34, 2017 DR34, 2017 BY93, 2017 BM32, 2002 FQ4
G96Mt. Lemmon Survey (MLS) in Arizona, 14 in MPECs 2017-D39, 2017-D40, 2017-D41, 2017-D42, 2017-D45, 2017-D46, 2017-D47, 2017-D48, 2017-D49, 2017-D50, 2017-D51, 2017-D52, 2017-D54 & 2017-D56 -- 2017 DW34, 2017 DV34, 2017 DU34, 2017 DT34, 2017 DS34, 2017 DR34, 2017 DQ34, 2017 DP34, 2017 DO34, 2017 DL34, 2017 DK34, 2017 DJ34, 2017 CX33, 2012 DR32
J69North Obs. in England, 2 in MPECs 2017-D46 & 2017-D55 -- 2017 DP34, 2017 DJ16
F51Pan-STARRS 1 (PS1) in Hawaii, 16 in MPECs 2017-D39, 2017-D40, 2017-D41, 2017-D43, 2017-D44, 2017-D49, 2017-D50, 2017-D51, 2017-D53 & 2017-D55 -- 2017 DX34, 2017 DV34, 2017 DU34, 2017 DT34, 2017 DN34, 2017 DM34, 2017 DK34, 2017 DJ34, 2017 CX33, 2014 DJ112, 2013 GL8, 2011 CX7, 2005 YV55, 469356, 40267, 386298
H36Sandlot Obs. in Kansas, 3 in MPECs 2017-D40, 2017-D42 & 2017-D43 -- 2017 DM34, 2017 DL34, 2017 DJ34
204Schiaparelli Obs. in Italy, 1 in MPEC 2017-D40 -- 2017 DJ34
W885M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Chile Obs. in Chile, 1 in MPEC 2017-D55 -- 20255
G45Space Surveillance Telescope Atom Site (SST Atom Site) in New Mexico, 71 in MPECs 2017-D43, 2017-D52 & 2017-D55 -- 2017 DW34, 2017 DT15, 2017 DR15, 2017 DM34, 2017 DJ16, 2017 CO5, 2017 BU31, 2017 BG85, 2017 BE29, 2017 AP20, 2017 AC5, 2016 WX9, 2016 UU80, 2016 QC84, 2014 DH23, 2013 KY1, 2013 GL8, 2012 BB124, 2011 QP96, 2010 CM44, 2009 FR30, 2008 ER7, 2005 YV55, 2005 TF, 2003 EZ16, 2003 CR1, 99935, 90075, 54789, 482391, 481904, 452389, 438955, 420286, 40267, 386298, 38086, 378610, 374038, 370702, 347813, 34613, 317255, 265482, 25916, 22771, 205378, 198752, 175189, 163696, 153951, 152671, 144411, 138359, 138155, 137158, 10165, 10115, 7480, 7088, 5836, 5693, 5653, 5646, 5626, 5189, 4055, 3552, 3103, 1916, 1862
691Spacewatch 0.9m telescope in Arizona, 5 in MPECs 2017-D41, 2017-D42, 2017-D43, 2017-D47 & 2017-D51 -- 2017 DV34, 2017 DR34, 2017 DM34, 2017 DL34, 2017 DK34
291Spacewatch 1.8m telescope in Arizona, 3 in MPECs 2017-D39, 2017-D43 & 2017-D44 -- 2017 DN34, 2017 DM34, 2017 CX33
I52Steward Obs. Mt. Lemmon Station in Arizona, 17 in MPECs 2017-D39, 2017-D40, 2017-D41, 2017-D42, 2017-D43, 2017-D44, 2017-D45, 2017-D46, 2017-D47, 2017-D48, 2017-D49, 2017-D50, 2017-D51, 2017-D52, 2017-D53, 2017-D54 & 2017-D56 -- 2017 DX34, 2017 DW34, 2017 DV34, 2017 DU34, 2017 DT34, 2017 DS34, 2017 DR34, 2017 DQ34, 2017 DP34, 2017 DO34, 2017 DN34, 2017 DM34, 2017 DL34, 2017 DK34, 2017 DJ34, 2017 CX33, 2012 DR32
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 4 in MPECs 2017-D55, 2017-D58 & 2017-D59 -- 2017 BW30, 2017 BP31, 2016 CX247, 2015 MP1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 24 February '17

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2359 UTC)
See the CRT page for a list of all objects rated recently as risks and our ephemerides page for a list of risk-listed objects under current observation.
The time horizon for JPL is 100 years from today and for NEODyS is usually the year 2090. Both also post impact solutions beyond 100 years for a few special objects.
For the latest official risk assessments, and for explanations of the terminology, see the JPL NEO Program Sentry and NEODyS CLOMON2 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
2017 DG16JPL Sentry16412074-2105155.9e-05-6.65-6.690JPL: "Analysis based on 37 observations spanning 2.5680 days (2017-Feb-21.23575 to 2017-Feb-23.803759)." Diameter approximately 0.004 km. from mean, weighted H=29.5.
2017 BV32NEODyS1641R E M O V E D-
2012 AP10NEODyS1641R E M O V E D-
JPL Sentry0512R E M O V E DJPL: Risk listing removed at 0423 UTC.

Legend: VI# = VI count, Prob Cum = cumulative probability, PS Cum/Max = cumulative/maximum Palermo Scale, TS = Torino Scale (next 100 years)

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 24 February '17

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

2352Updated Traffic Report
2323Grabbed MPEC 2017-D57 - 2003 TK2 - see above
Grabbed MPEC 2017-D58 - 2015 MP1 - see above
Grabbed MPEC 2017-D59 - 2016 CX247 - see above
2230Grabbed MPEC 2017-D56 - 2012 DR32 - see above
1641Noted that NEODyS has removed 2012 AP10 as an impact risk - see above
Noted that NEODyS has removed 2017 BV32 as an impact risk - see above
Noted that JPL Sentry has updated its 2017 DG16 risk assessment - see above
Grabbed MPEC 2017-D55 - Daily Orbit Update - see above
0512Noted that JPL Sentry has removed 2012 AP10 as an impact risk - see above
Grabbed MPEC 2017-D39 - 2017 CX33 - see above
Grabbed MPEC 2017-D40 - 2017 DJ34 - see above
Grabbed MPEC 2017-D41 - 2017 DK34 - see above
Grabbed MPEC 2017-D42 - 2017 DL34 - see above
Grabbed MPEC 2017-D43 - 2017 DM34 - see above
Grabbed MPEC 2017-D44 - 2017 DN34 - see above
Grabbed MPEC 2017-D45 - 2017 DO34 - see above
Grabbed MPEC 2017-D46 - 2017 DP34 - see above
Grabbed MPEC 2017-D47 - 2017 DR34 - see above
Grabbed MPEC 2017-D48 - 2017 DS34 - see above
Grabbed MPEC 2017-D49 - 2017 DT34 - see above
Grabbed MPEC 2017-D50 - 2017 DU34 - see above
Grabbed MPEC 2017-D51 - 2017 DV34 - see above
Grabbed MPEC 2017-D52 - 2017 DW34 - see above
Grabbed MPEC 2017-D53 - 2017 DX34 - see above
Grabbed MPEC 2017-D54 - 2017 DQ34 - see above
0235Grabbed MPEC 2017-D38 - 2012 AP10 - see above