Contents  on 24 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 24 September '17

Six objects reported inside ten LD

Six asteroids are known to be within ten lunar distances (LD) of Earth today. Nearest is newly announced 2017 ST10, which came its closest to our planet on this passage, reaching 2.76 LD at 0704 UTC.

Earth passage I D ~Size Distance Today  Notes
0.24 LD Sept. 202017 SR2 6 m  6.79 to 8.94 LD intruder
0.81 LD Sept. 202017 SM2 12 m  6.99 to 8.86 LD intruder
2.76 LD today2017 ST10 7 m  2.76 LD NEW, Earth closest at 0704 UTC - MPEC
4.76 LD Sept. 262017 RB16 25 m  5.61 from 6.98 LD
4.96 LD tomorrow2017 RO16 10 m  5.20 from 6.02 LD DOU
5.77 LD Sept. 222017 RB15 10 m  5.89 to 6.22 LD

This report was updated at 2110 UTC with the discovery of 2017 ST10 (MPEC). Your first local flying rocks traffic report was generated at 1752 UTC with first follow-up for departed objects 2017 SR10 and risk-listed 2017 RP16 in today's DOU MPEC along with continuing follow-up for inbound 2017 RO16 and astrometry from July for radar target 441987 2010 NY65.

Approaching (sorted by 10-LD bubble entry date)
7.87 LD Sept. 291989 VB 389 m  < 10 LD tomorrow, radar target
9.92 LD Sept. 272017 SS10 31 m  < 10 LD Sept. 26
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. 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 September '17

The MPC's NEO Confirmation Page has 170 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 170 objects listed. Of these, 89 were "one nighters." So far The Tracking News has counted a total of 175 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 24 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-S120 - "18:41 UT" - 2017 ST10


<< DOU on 24 Sept. '17 >>  MPEC 2017-S119 - "12:03 UT" - Daily Orbit Update


MPEC 2017-S118 - "11:24 UT" - 2016 LM11

Observers  on 24 September '17

A total of 23 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 28 in MPECs 2017-S119 & 2017-S120 -- 2017 ST10, 2017 RX1, 2017 RW1, 2017 RV1, 2017 RU1, 2017 RU, 2017 RQ16, 2017 RP16, 2017 RK1, 2017 RE16, 2017 QX35, 2017 QV34, 2017 QT35, 2017 QN33, 2017 QM18, 2017 QJ18, 2017 QF2, 2017 PT25, 2017 PS25, 2017 PR25, 2017 PJ26, 2017 OP68, 2017 OJ68, 2017 OG68, 2017 MO7, 2017 DQ15, 2010 TH19, 2010 KY39
T05ATLAS Haleakala in Hawaii, 31 in MPEC 2017-S119 -- 2017 SN2, 2017 RR15, 2017 RK1, 2017 QQ32, 2017 QL18, 2017 PS25, 2017 PJ26, 2017 OP68, 2014 YC15, 2002 RP28, 90075, 68950, 65679, 55408, 52762, 496018, 496005, 495848, 441825, 338176, 265962, 190208, 143624, 142464, 142040, 11500, 100926, 8037, 3361, 1980, 1865
T08ATLAS Mauna Loa in Hawaii, 10 in MPEC 2017-S119 -- 2017 OD1, 2004 SS, 2002 RP28, 1998 SZ27, 242211, 21374, 142561, 137799, 137199, 7336
B88Bigmuskie Obs. in Italy, 1 in MPEC 2017-S119 -- 2017 OT18
160Castelmartini Obs. in Italy, 13 in MPEC 2017-S119 -- 2017 PR25, 2017 PJ26, 2017 OP68, 2017 BM31, 2014 YC15, 2011 ED78, 495331, 441987, 190166, 142561, 11398, 106589, 6063
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 15 in MPECs 2017-S118 & 2017-S119 -- 2017 SJ2, 2017 RV15, 2017 RU15, 2017 RO2, 2017 RE16, 2017 QS35, 2017 PK26, 2017 OS68, 2017 OS18, 2017 MV2, 2017 KE5, 2017 HW48, 2017 HW1, 2017 GU6, 2016 LM11
006Fabra Obs. in Spain, 1 in MPEC 2017-S119 -- 3122
B34Green Island Obs. in Cyprus, 6 in MPEC 2017-S119 -- 2017 RV1, 2017 PR25, 2017 OP68, 90075, 68950, 7336
G48Harlingten Research Obs. in New Mexico, 1 in MPEC 2017-S119 -- 2017 SN2
K78Iota Scorpii Obs., 2 in MPEC 2017-S119 -- 2017 RV1, 2017 RL
W19Kalamazoo Obs. in Michigan, 2 in MPEC 2017-S119 -- 90075, 3122
Z43Landehen Obs., 3 in MPEC 2017-S119 -- 2017 PR25, 2017 OP68, 90075
W85LCOGT Cerro Tololo A in Chile, 1 in MPEC 2017-S119 -- 2017 SR10
C10Maisoncelles Obs. in France, 1 in MPEC 2017-S119 -- 3200
568_Marco Micheli on Mauna Kea in Hawaii, 1 in MPEC 2017-S119 -- 2014 TW57
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2017-S120 -- 2017 ST10
J43Oukaimeden Obs. in Morocco, 3 in MPEC 2017-S119 -- 2015 XR128, 496018, 163454
F51Pan-STARRS 1 (PS1) in Hawaii, 28 in MPEC 2017-S119 -- 2017 SK2, 2017 SK10, 2017 SH10, 2017 RH15, 2017 QF2, 2017 OS18, 2017 HH, 2017 FQ64, 2017 FE1, 2015 RT83, 2014 LA27, 2013 QH48, 2007 TR65, 2003 SJ154, 2002 RP137, 2000 DQ110, 65679, 482798, 437846, 392211, 350536, 30825, 223456, 20429, 162694, 141874, 139047, 8037
122Pises Obs. in France, 4 in MPEC 2017-S119 -- 2017 RU1, 2017 QL35, 441825, 265962
K96Savelli Obs., 1 in MPEC 2017-S119 -- 3122
K14Sencelles Obs. in Spain, 1 in MPEC 2017-S119 -- 2017 RV1
I52Steward Obs. Mt. Lemmon Station in Arizona, 15 in MPEC 2017-S119 -- 2017 SQ10, 2017 SP10, 2017 SN10, 2017 SL2, 2017 SK10, 2017 RX15, 2017 RW2, 2017 RV15, 2017 RU15, 2017 RO2, 2017 RO16, 2017 RM1, 2017 QX35, 2017 QP33, 2017 QO2
926Tenagra II Obs. in Arizona, 3 in MPECs 2017-S119 & 2017-S120 -- 2017 ST10, 2017 RX1, 2017 KD5
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 24 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 RP16JPL Sentry15422065-2112114.08257e-06-6.64-7.090JPL: Computed at 08:06 today Pacific time based on 16 observations spanning 7.7878 days (2017-Sep-15.41118 to 2017-Sep-23.19898). Diameter approximately 0.012 km. from weighted mean H=27.20.

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 September '17

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

2110Updated Traffic Report
1901Grabbed MPEC 2017-S120 - 2017 ST10 - see above
1542Noted that JPL Sentry has updated its 2017 RP16 risk assessment - see above
Grabbed MPEC 2017-S118 - 2016 LM11 - see above
Grabbed MPEC 2017-S119 - Daily Orbit Update - see above