Contents  on 2 October '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 2 October '17

Three objects reported inside ten LD

There are three transient natural objects known to be less than ten lunar distances (LD) from our planet today. Nearest is intruder 2017 SX17, which comes its closest to Earth, reaching 0.23 LD at 1019 UTC.

Earth passage I D ~Size Distance Today  Notes
0.23 LD today2017 SX17 8 m  0.23 LD intruder today, Earth closest at 1019 UTC - DOU
5.38 LD tomorrow2017 SS16 16 m  5.45 from 7.03 LD
7.87 LD Sept. 291989 VB 389 m  8.44 to 9.05 LD radar target
Approaching (sorted by 10-LD bubble entry date)
0.13 LD Oct. 122012 TC4 15 m  < 10 LD Oct. 5, intruder, radar/NHATS target, risk - DOU
8.94 LD Oct. 112017 SB20 36 m  < 10 LD Oct. 8
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

This report was generated at 2024 UTC with follow-up in today's DOU MPEC for 2017 SX17 and 2012 TC4 along with follow-up for departed objects 2017 SR16, 2017 SH16, 2017 SD12, and risk-listed intruders 2017 SS12 and 2017 SQ2, plus distant 2014 HQ124.



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 (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 2 October '17

The MPC's NEO Confirmation Page has 95 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 95 objects listed. Of these, 34 were "one nighters." So far The Tracking News has counted a total of 111 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 2 October '17

Minor Planet Electronic Circulars

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


MPEC 2017-T12 - "21:32 UT" - 2016 SG17


<< DOU on 2 Oct. '17 >>  MPEC 2017-T11 - "12:07 UT" - Daily Orbit Update

Observers  on 2 October '17

A total of 20 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 5 in MPEC 2017-T11 -- 2017 SQ2, 2017 SH2, 2010 KY39, 311066, 17188
T05ATLAS Haleakala in Hawaii, 15 in MPEC 2017-T11 -- 2017 OP68, 2015 KN120, 2004 TQ13, 2004 SS, 2004 RE84, 90075, 65679, 55408, 338176, 333888, 265962, 220909, 190208, 11500, 1865
T08ATLAS Mauna Loa in Hawaii, 6 in MPEC 2017-T11 -- 2017 OD1, 2017 MV2, 2004 TD10, 242211, 137799, 7336
160Castelmartini Obs. in Italy, 16 in MPEC 2017-T11 -- 2017 SN2, 2017 MY3, 2015 KN120, 1993 RA, 96590, 87684, 85709, 65679, 53319, 496018, 495858, 337228, 190208, 162011, 8567, 8037
703Catalina Sky Survey (CSS) in Arizona, 25 in MPEC 2017-T11 -- 2017 SO16, 2017 QT35, 2015 KN120, 2014 CD13, 2009 WC52, 2004 TQ13, 2004 SS, 96590, 65679, 495511, 381906, 337228, 333888, 265962, 222073, 190208, 162215, 162186, 159399, 143624, 143404, 11500, 9950, 2212, 1865
K87Dettelbach Vineyard Obs. in Germany, 1 in MPEC 2017-T11 -- 2017 SN14
006Fabra Obs. in Spain, 3 in MPEC 2017-T11 -- 6053, 3122, 1980
U699Steven M. Tilley in Louisiana via iTelescope Obs. Auberry in northern California, 1 in MPEC 2017-T11 -- 2012 TC4
W19Kalamazoo Obs. in Michigan, 1 in MPEC 2017-T11 -- 2014 YC15
695^Spacewatch via Kitt Peak Natl. Obs. (KPNO) in Arizona, 2 in MPEC 2017-T11 -- 2017 SH14, 2017 EQ13
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2017-T11 -- 2012 TC4
G96Mt. Lemmon Survey (MLS) in Arizona, 12 in MPEC 2017-T11 -- 2017 SR16, 2017 SN14, 2017 QS17, 2017 PS25, 2017 OP68, 2011 UG20, 392211, 333908, 31221, 20086, 17182, 142464
C47Nonndorf Obs. in Austria, 1 in MPEC 2017-T11 -- 2017 SX17
F51Pan-STARRS 1 (PS1) in Hawaii, 8 in MPEC 2017-T11 -- 2017 SD12, 2017 QM35, 2007 RM133, 2002 RP28, 89355, 408792, 15817, 1865
691Spacewatch 0.9m telescope in Arizona, 8 in MPEC 2017-T11 -- 2017 SO16, 2017 MO7, 2017 HH, 2014 HQ124, 2006 TU7, 2004 RX109, 355770, 142563
291Spacewatch 1.8m telescope in Arizona, 5 in MPEC 2017-T11 -- 2017 SS12, 2017 SL17, 2017 SB21, 2017 MB1, 2011 UG20
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2017-T11 -- 3122
926Tenagra II Obs. in Arizona, 14 in MPECs 2017-T11 & 2017-T12 -- 2017 SX17, 2017 SV20, 2017 ST14, 2017 SS17, 2017 SR17, 2017 SO10, 2017 SN12, 2017 SM17, 2017 SK14, 2017 SK12, 2017 SH16, 2017 SB21, 2017 RT1, 2016 SG17
W33Transit Dreams Obs., 5 in MPEC 2017-T11 -- 2017 PR25, 90075, 190166, 6053, 3122
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-T11 -- 2010 CP140
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 2 October '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 SV20JPL Sentry20482071-210581.725207e-07-3.78-3.860JPL: Computed at 08:35 today Pacific time based on 17 observations spanning 4.8660 days (2017-Sep-26.59876 to 2017-Oct-01.46471). Diameter approximately 0.590 km. from weighted mean H=18.78.
2017 SF20NEODyS15402034-203622.16e-04-4.82-4.820NEODyS: "Based on 24 optical observations (of which 2 are rejected as outliers) from 2017-09-28.368 to 2017-10-01.356."
2017 SE19NEODyS1540207619.3e-11-7.74-7.740NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2017-09-22.531 to 2017-09-30.504."
2017 SU17NEODyS15402055-2117793.79e-05-6.15-6.730NEODyS: "Based on 29 optical observations (of which 2 are rejected as outliers) from 2017-09-26.445 to 2017-10-01.274."
2017 SM14NEODyS1540R E M O V E D-
2017 SH14JPL Sentry2048R E M O V E DJPL: Risk listing removed at 1503 UTC today.
NEODyS1604R E M O V E D-
2017 SS12JPL Sentry20482074-211371.67564e-06-7.01-7.420JPL: Computed at 08:04 today Pacific time based on 87 observations spanning 6.9212 days (2017-Sep-25.23585 to 2017-Oct-02.15703). Diameter approximately 0.013 km. from weighted mean H=27.12.
NEODyS15402071-2117201.35e-06-7.10-7.570NEODyS: "Based on 87 optical observations (of which 10 are rejected as outliers) from 2017-09-25.237 to 2017-10-01.165."
2017 SQ2JPL Sentry20482092-209211.620e-07-7.45-7.450JPL: Computed at 08:34 today Pacific time based on 36 observations spanning 12.948 days (2017-Sep-18.34652 to 2017-Oct-01.294389). Diameter approximately 0.023 km. from weighted mean H=25.88.
NEODyS1540209212.83e-07-7.22-7.220NEODyS: "Based on 33 optical observations (of which 0 are rejected as outliers) from 2017-09-18.347 to 2017-09-30.440."
2017 PL26NEODyS15402100-210925.38e-08-6.24-6.250NEODyS: "Based on 211 optical observations (of which 22 are rejected as outliers) from 2017-06-21.528 to 2017-09-30.497."
2017 MB1JPL Sentry2048R E M O V E DJPL: Risk listing removed at 1458 UTC today.
NEODyS1604R E M O V E D-
2017 BL30NEODyS1540R E M O V E D-
2009 FZ4JPL Sentry20482018-21164002.4869658e-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.

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 2 October '17

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

2233Grabbed MPEC 2017-T12 - 2016 SG17 - see above
2048Noted that JPL Sentry has updated its 2009 FZ4 risk assessment - see above
Noted that JPL Sentry has removed 2017 MB1 as an impact risk - see above
Noted that JPL Sentry has removed 2017 SH14 as an impact risk - see above
Noted that JPL Sentry has reposted 2017 SQ2 as an impact risk - see above
Noted that JPL Sentry has updated its 2017 SS12 risk assessment - see above
Noted that JPL Sentry has updated its 2017 SV20 risk assessment - see above
2024Generated Traffic Report
1604Noted that NEODyS has removed 2017 MB1 as an impact risk - see above
Noted that NEODyS has removed 2017 SH14 as an impact risk - see above
1540Noted that NEODyS has removed 2017 BL30 as an impact risk - see above
Noted that NEODyS has updated its 2017 PL26 risk assessment - see above
Noted that NEODyS has posted 2017 SE19 as an impact risk - see above
Noted that NEODyS has posted 2017 SF20 as an impact risk - see above
Noted that NEODyS has removed 2017 SM14 as an impact risk - see above
Noted that NEODyS has updated its 2017 SQ2 risk assessment - see above
Noted that NEODyS has updated its 2017 SS12 risk assessment - see above
Noted that NEODyS has updated its 2017 SU17 risk assessment - see above
Grabbed MPEC 2017-T11 - Daily Orbit Update - see above