Contents  on 19 September '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 19 September '17

Six objects reported inside ten LD

There are six minor objects reported within ten lunar distances (LD) of our planet today. Closest is risk-listed 2017 RK2, which is outbound from 3.12 to 4.40 LD.

Earth passage I D ~Size Distance Today  Notes
2.45 LD Sept. 172017 RK2 8 m  3.12 to 4.40 LD risk
5.76 LD Sept. 222017 RB15 9 m  6.66 from 7.30 LD
6.18 LD yesterday2017 RX2 17 m  6.23 to 7.18 LD risk - DOU
6.44 LD Sept. 122017 RS2 19 m  9.29 to 10.01 LD exits ten LD
6.79 LD yesterday2017 RU2 22 m  6.79 to 7.14 LD risk
7.86 LD today2017 RG2 44 m  7.86 LD Earth closest at 1835 UTC

This report was generated at 1810 UTC with first follow-up for 2017 RX2 in today's DOU MPEC along with additional observation of approaching 2017 RB16 and departed risk-listed 2017 RV2, as well as continuing follow-up for approaching 1989 VB plus the recovery of distant 2007 DT103.

Approaching (sorted by 10-LD bubble entry date)
4.75 LD Sept. 262017 RB16 26 m  < 10 LD Sept. 22 - DOU
9.77 LD Sept. 222017 RQ15 21 m  < 10 LD Sept. 22
7.87 LD Sept. 291989 VB 389 m  < 10 LD Sept. 25, radar target - DOU
0.13 LD Oct. 122012 TC4 15 m  < 10 LD Oct. 5, intruder, radar/NHATS target, risk
8.5   LD Oct. 132005 TE49 15 m  < 10 LD Oct. 11, uncertainty +/- 10.1167 hours, NHATS target
5.77 LD Oct. 22171576 1999 VP11 645 m  < 10 LD Oct. 20



Notes: Ten times the distance to the Moon (ten LD) has no astronomical importance but is a useful boundary for reporting about transient natural objects that approach our planet's 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 ten-plus years ago 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 19 September '17

The MPC's NEO Confirmation Page has 90 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 90 objects listed. Of these, 26 were "one nighters." So far The Tracking News has counted a total of 102 listings on the NEOCP today.

To learn how observers use the NEOCP, see the Practical guide on how to observe NEOCP object at Suno Observatory by Birtwhistle et al.

New MPECs  on 19 September '17

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been three MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2017-S57 - "21:05 UT" - Comet C/2017 O1 (ASASSN)


MPEC 2017-S56 - "14:01 UT" - 2004 TD10


<< DOU on 19 Sept. '17 >>  MPEC 2017-S55 - "12:04 UT" - Daily Orbit Update

Observers  on 19 September '17

A total of 52 observers appear in today's MPECs.

CodeObserver / observatory
349Ageo Obs. in Japan, 1 in MPEC 2017-S57 -- C/2017 O1
H21Astronomical Research Obs. Westfield in Illinois, 17 in MPEC 2017-S55 -- 2017 RX2, 2017 RX1, 2017 RV2, 2017 RU, 2017 RK1, 2017 RK, 2017 QV35, 2017 QV34, 2017 QL18, 2017 QJ33, 2017 OJ68, 2017 OH68, 2017 OB68, 2017 FE128, 2007 DT103, 2001 QE34, 96536
T05ATLAS Haleakala in Hawaii, 1 in MPEC 2017-S57 -- C/2017 O1
T08ATLAS Mauna Loa in Hawaii, 8 in MPEC 2017-S55 -- 2017 RL, 2008 MH1, 483422, 329520, 294739, 153415, 12711, 3122
Q68Blue Mountains Obs. in New South Wales, 1 in MPEC 2017-S55 -- 1989 VB
W96Campo Catino Austral Obs. in Chile, 1 in MPEC 2017-S57 -- C/2017 O1
160Castelmartini Obs. in Italy, 1 in MPEC 2017-S57 -- C/2017 O1
703Catalina Sky Survey (CSS) in Arizona, 19 in MPEC 2017-S55 -- 2017 RX1, 2017 RU, 2017 PS25, 2016 AA9, 2014 YC15, 90075, 85709, 65679, 495848, 294739, 265962, 190208, 162998, 143624, 143404, 11500, 8035, 1980, 1865
107Cavezzo Obs. in Italy, 1 in MPEC 2017-S57 -- C/2017 O1
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 2 in MPEC 2017-S55 -- 2017 RB16, 2017 RA14
A77Chante-Perdrix Obs. in France, 1 in MPEC 2017-S57 -- C/2017 O1
970Chelmsford Obs. in England, 1 in MPEC 2017-S57 -- C/2017 O1
J01Cielo Profundo Obs. in Spain, 1 in MPEC 2017-S57 -- C/2017 O1
I17Cupillari Obs. in Pennsylvania, 1 in MPEC 2017-S57 -- C/2017 O1
K02Eastwood Obs. in England, 1 in MPEC 2017-S57 -- C/2017 O1
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 3 in MPECs 2017-S55 & 2017-S56 -- 2017 RO2, 2016 GA222, 2004 TD10
372Geisei Obs. in Japan, 1 in MPEC 2017-S57 -- C/2017 O1
G48Harlingten Research Obs. in New Mexico, 1 in MPEC 2017-S55 -- 2016 AA9
H06iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2017-S57 -- C/2017 O1
Q626Erik Bryssinck in Belgium via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-S57 -- C/2017 O1
Q62|Sergio Foglia in Italy via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-S55 -- 1989 VB
W19Kalamazoo Obs. in Michigan, 1 in MPEC 2017-S55 -- 2014 YC15
585Kiev Comet Station in Ukraine, 1 in MPEC 2017-S57 -- C/2017 O1
246KLENOT in the Czech Republic, 1 in MPEC 2017-S57 -- C/2017 O1
D95Kurihara Obs. in Japan, 1 in MPEC 2017-S57 -- C/2017 O1
K91LCOGT Sutherland A in South Africa, 3 in MPEC 2017-S55 -- 2013 SL30, 2011 PT, 2006 TU7
C10Maisoncelles Obs. in France, 1 in MPEC 2017-S57 -- C/2017 O1
Z50Mazariegos Obs., 1 in MPEC 2017-S57 -- C/2017 O1
213Montcabre Obs. in Spain, 1 in MPEC 2017-S57 -- C/2017 O1
D81Nagano Obs. in Japan, 1 in MPEC 2017-S57 -- C/2017 O1
Z80Northolt Branch Obs. in England, 1 in MPEC 2017-S57 -- C/2017 O1
C23Olmen Obs. in Belgium, 1 in MPEC 2017-S57 -- C/2017 O1
J43Oukaimeden Obs. in Morocco, 1 in MPEC 2017-S55 -- 23714
F51Pan-STARRS 1 (PS1) in Hawaii, 8 in MPECs 2017-S55 & 2017-S56 -- 2017 QM35, 2017 PC27, 2017 HV3, 2017 CN1, 2004 TD10, 414990, 397237, 15817
G39ROAD in Chile, 1 in MPEC 2017-S57 -- C/2017 O1
L04ROASTERR-1 in Romania, 5 in MPECs 2017-S55 & 2017-S57 -- 2017 RL, C/2017 O1, 326388, 294739, 3122
K14Sencelles Obs. in Spain, 1 in MPEC 2017-S57 -- C/2017 O1
Y28Sertao de Itaparica Obs. in Brazil, 1 in MPEC 2017-S55 -- 2016 GA222
G402program code 2 via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-S57 -- C/2017 O1
G409B. Lutkenhoner in Germany via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-S57 -- C/2017 O1
W885M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Chile Obs. in Chile, 1 in MPEC 2017-S55 -- 1989 VB
Y00SONEAR in Brazil, 1 in MPEC 2017-S55 -- 485652
Q21Southern Utsunomiya in Japan, 1 in MPEC 2017-S57 -- C/2017 O1
691Spacewatch 0.9m telescope in Arizona, 9 in MPECs 2017-S55 & 2017-S56 -- 2017 RO2, 2017 QW17, 2017 QQ35, 2017 QM18, 2017 QG3, 2017 FE1, 2004 TD10, 2004 RX109, 52768
291Spacewatch 1.8m telescope in Arizona, 3 in MPEC 2017-S55 -- 2016 TR54, 2013 TS5, 2006 OC5
I52Steward Obs. Mt. Lemmon Station in Arizona, 2 in MPEC 2017-S55 -- 2017 RU1, 2017 RL2
A71Stixendorf Obs. in Austria, 1 in MPEC 2017-S57 -- C/2017 O1
461SZTE Asteroid Program in Hungary, 1 in MPEC 2017-S57 -- C/2017 O1
J22Tacande Obs. in the Canary Islands, 1 in MPEC 2017-S57 -- C/2017 O1
I81Tarbatness Obs. in Scotland, 1 in MPEC 2017-S57 -- C/2017 O1
926Tenagra II Obs. in Arizona, 4 in MPECs 2017-S55 & 2017-S56 -- 2017 RX2, 2017 RU1, 2017 QY16, 2004 TD10
H47Vicksburg Obs. in Mississippi, 1 in MPEC 2017-S57 -- C/2017 O1
C51WISE in Earth polar orbit, 2 in MPEC 2017-S55 -- 444193, 4197
367Yatsuka Obs. in Japan, 1 in MPEC 2017-S57 -- C/2017 O1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 19 September '17

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2358 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 NASA/JPL 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 RX2JPL Sentry16062047-204717.561e-09-8.59-8.590JPL: Computed at 08:38 today Pacific time based on 36 observations spanning 3.6689 days (2017-Sep-15.45005 to 2017-Sep-19.1189). Diameter approximately 0.017 km. from weighted mean H=26.51.
2017 RV2JPL Sentry15372082-2117450.000111488627-4.92-5.730JPL: Computed at 08:05 today Pacific time based on 102 observations spanning 3.0707 days (2017-Sep-14.43497 to 2017-Sep-17.50564). Diameter approximately 0.019 km. from weighted mean H=26.21.
2017 RO2NEODyS1537R E M O V E D-
2017 RCNEODyS15372084-2117553.38e-05-6.19-6.520NEODyS: "Based on 36 optical observations (of which 0 are rejected as outliers) from 2017-09-01.386 to 2017-09-15.330."
2015 HV182JPL Sentry15372018-21011931.981533e-07-4.50-5.470JPL: Computed at 13:25 April 6th Pacific time based on 9 observations spanning .99953 days (2015-Apr-18.27618 to 2015-Apr-19.27571). Diameter approximately 0.157 km. from weighted mean H=21.70.
2012 TC4NEODyS15372050-2113659.71e-04-4.03-4.340NEODyS: "Based on 291 optical observations (of which 1 are rejected as outliers) from 2012-10-04.468 to 2017-09-17.412."
2009 FZ4JPL Sentry15372017-21164012.4872157e-06-5.20-5.770JPL: Computed at 22:33 April 7th Pacific time based on 11 observations spanning .59999 days (2009-Mar-19.36974 to 2009-Mar-19.96973). Diameter approximately 0.031 km. from weighted mean H=25.21.
2006 UJ185NEODyS15372083-2114152.22e-05-6.01-6.130NEODyS: "Based on 42 optical observations (of which 1 are rejected as outliers) from 2006-10-28.290 to 2017-09-17.511."

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 19 September '17

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

2134Grabbed MPEC 2017-S57 - Comet C/2017 O1 (ASASSN) - see above
1810Generated Traffic Report
1606Noted that JPL Sentry has updated its 2017 RX2 risk assessment - see above
1537Noted that NEODyS has updated its 2006 UJ185 risk assessment - see above
Noted that JPL Sentry has updated its 2009 FZ4 risk assessment - see above
Noted that NEODyS has updated its 2012 TC4 risk assessment - see above
Noted that JPL Sentry has updated its 2015 HV182 risk assessment - see above
Noted that NEODyS has updated its 2017 RC risk assessment - see above
Noted that NEODyS has removed 2017 RO2 as an impact risk - see above
Noted that JPL Sentry has updated its 2017 RV2 risk assessment - see above
Grabbed MPEC 2017-S55 - Daily Orbit Update - see above
Grabbed MPEC 2017-S56 - 2004 TD10 - see above