Contents  on 22 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 22 September '17

Nine objects reported inside ten LD

There are nine transient natural objects known to be within ten lunar distances (LD) of Earth today. Nearest are two intruders on their way out. 2017 SR2 heads away from 2.50 to 4.65 LD and 2017 SM2 from 3.28 to 5.12 LD.

Earth passage I D ~Size Distance Today  Notes
0.24 LD Sept. 202017 SR2 6 m  2.50 to 4.65 LD intruder
0.81 LD Sept. 202017 SM2 12 m  3.28 to 5.12 LD intruder
2.45 LD Sept. 172017 RK2 9 m  7.51 to 9.15 LD risk
4.76 LD Sept. 262017 RB16 25 m  8.66 from 10.51 LD enters ten LD
4.96 LD Sept. 252017 RO16 9 m  7.24 from 8.69 LD DOU
5.77 LD today2017 RB15 10 m  5.77 LD Earth closest at 2234 UTC - DOU
6.79 LD Sept. 182017 RU2 24 m  9.19 to 10.63 LD risk, exits ten LD
7.85 LD Sept. 192017 RG2 45 m  8.91 to 9.94 LD
9.71 LD today2017 RQ15 22 m  9.71 LD enters ten LD, Earth closest at 1833 UTC - DOU

This report was generated at 1848 UTC with first follow-up for 2017 RO16 and departed risk-listed 2017 RN16 in today's DOU MPEC, along with continuing follow-up for 2017 RQ15, 2017 RB15, 2012 TC4, and departed risk-listed 2017 RV2.

Approaching (sorted by 10-LD bubble entry date)
7.87 LD Sept. 291989 VB 389 m  < 10 LD Sept. 25, radar target
0.13 LD Oct. 122012 TC4 15 m  < 10 LD Oct. 5, intruder, radar/NHATS target, risk - DOU
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 22 September '17

The MPC's NEO Confirmation Page has 82 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 82 objects listed. Of these, 33 were "one nighters." So far The Tracking News has counted a total of 104 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 22 September '17

Minor Planet Electronic Circulars

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


MPEC 2017-S109 - "17:12 UT" - 2017 SK10


MPEC 2017-S108 - "17:08 UT" - 2017 SQ10


MPEC 2017-S107 - "17:05 UT" - 2017 SP10


MPEC 2017-S106 - "17:01 UT" - 2017 SO10


MPEC 2017-S105 - "16:58 UT" - 2017 SN10


MPEC 2017-S104 - "16:54 UT" - 2017 SM10


MPEC 2017-S103 - "16:50 UT" - 2017 SL10


MPEC 2017-S102 - "16:39 UT" - 2017 SJ10


MPEC 2017-S101 - "16:36 UT" - 2017 SH10


MPEC 2017-S100 - "16:32 UT" - 2017 SG10


MPEC 2017-S99 - "16:28 UT" - 2017 SF10


MPEC 2017-S98 - "14:27 UT" - Comet C/2017 S2 (Panstarrs)


MPEC 2017-S97 - "13:41 UT" - Comet P/2017 R1 (Panstarrs)


<< DOU on 22 Sept. '17 >>  MPEC 2017-S96 - "12:04 UT" - Daily Orbit Update

Observers  on 22 September '17

A total of 38 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 18 in MPECs 2017-S96, 2017-S103 & 2017-S106 -- 2017 SO10, 2017 SL10, 2017 QV17, 2017 QN33, 2017 QB2, 2017 MZ, 2017 MF4, 2017 HQ49, 2015 VR1, 2014 SJ143, 2014 SD224, 2013 PE26, 2012 TC4, 2010 TH19, 374449, 225416, 17188, 164216
T05ATLAS Haleakala in Hawaii, 14 in MPEC 2017-S96 -- 2017 RW1, 2017 QO17, 2017 OD1, 1998 SZ27, 66008, 495959, 25330, 242211, 154589, 142561, 141874, 137799, 11398, 5786
Z84Calar Alto Schmidt in Spain, 1 in MPEC 2017-S101 -- 2017 SH10
703Catalina Sky Survey (CSS) in Arizona, 9 in MPEC 2017-S96 -- 2017 RX1, 2017 PJ26, 2017 PB27, 2014 YC15, 2008 MH1, 329520, 294739, 153415, 1865
107Cavezzo Obs. in Italy, 2 in MPEC 2017-S96 -- 2014 YC15, 496005
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 5 in MPECs 2017-S96, 2017-S99, 2017-S100 & 2017-S109 -- 2017 SK10, 2017 SG10, 2017 SF10, 2017 OV68, 2017 MY8
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 2 in MPECs 2017-S96 & 2017-S105 -- 2017 SN10, 2017 RO16
006Fabra Obs. in Spain, 1 in MPEC 2017-S96 -- 3122
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2017-S107 -- 2017 SP10
J95Great Shefford Obs. in England, 4 in MPECs 2017-S102, 2017-S106, 2017-S107 & 2017-S108 -- 2017 SQ10, 2017 SP10, 2017 SO10, 2017 SJ10
A17Guidestar Obs. in Germany, 4 in MPEC 2017-S96 -- 2017 PS25, 2005 EF, 17511, 172034
H15ISON New Mexico Obs. in New Mexico, 1 in MPEC 2017-S96 -- 142464
Q621Hidetaka Sato in Japan via iTelescope Obs. Siding Spring in New South Wales, 2 in MPECs 2017-S97 & 2017-S98 -- C/2017 S2, P/2017 R1
Q62|Sergio Foglia in Italy via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-S96 -- 2004 RE84
W85LCOGT Cerro Tololo A in Chile, 2 in MPECs 2017-S97 & 2017-S102 -- 2017 SJ10, P/2017 R1
K91LCOGT Sutherland A in South Africa, 2 in MPECs 2017-S99 & 2017-S104 -- 2017 SM10, 2017 SF10
K93LCOGT Sutherland C in South Africa, 1 in MPEC 2017-S98 -- C/2017 S2
568_Marco Micheli on Mauna Kea in Hawaii, 8 in MPECs 2017-S96, 2017-S97, 2017-S98, 2017-S100, 2017-S102, 2017-S103 & 2017-S109 -- 2017 SL10, 2017 SK10, 2017 SJ10, 2017 SG10, C/2017 S2, 2017 RO16, 2017 RN16, P/2017 R1
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPECs 2017-S96 & 2017-S97 -- P/2017 R1, 2015 BF4
608NEAT's USAF Haleakala telescope in Hawaii, 1 in MPEC 2017-S96 -- 2012 CQ36
0895N.V. Maigurova via Nikolaev Obs. in Ukraine, 5 in MPEC 2017-S96 -- 2017 PJ26, 2017 OP68, 2014 YC15, 326388, 4197
J69North Obs. in England, 1 in MPEC 2017-S96 -- 2017 PJ26
F51Pan-STARRS 1 (PS1) in Hawaii, 39 in MPECs 2017-S96, 2017-S97, 2017-S98, 2017-S99, 2017-S100, 2017-S101, 2017-S102, 2017-S103, 2017-S104, 2017-S105, 2017-S106, 2017-S107, 2017-S108 & 2017-S109 -- 2017 SQ10, 2017 SP10, 2017 SO10, 2017 SN10, 2017 SM10, 2017 SL10, 2017 SK10, 2017 SJ10, 2017 SH10, 2017 SG10, 2017 SF10, 2017 SE2, C/2017 S2, 2017 RP15, 2017 RD15, P/2017 R1, 2017 QM18, 2017 PN26, 2017 PA27, 2017 OP68, 2017 OG68, 2017 MY8, 2017 MY2, 2017 MO7, 2015 FH120, 2015 BF4, 2010 DB34, 2007 PS9, 2006 KA40, 2001 QE34, 415027, 376707, 333888, 226554, 222073, 190788, 162215, 137799, 5786
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 20 in MPEC 2017-S96 -- 2017 SN2, 2017 RV2, 2017 RV1, 2017 RU1, 2017 RR15, 2017 RK1, 2017 QV34, 2017 QL35, 2017 PS25, 2017 PR25, 2017 PJ26, 2017 OP68, 2017 MY3, 2016 AA9, 2015 KN120, 2014 YC15, 2014 CD13, 2006 KA40, 2004 TQ13, 1989 UP
122Pises Obs. in France, 4 in MPEC 2017-S96 -- 2017 OP68, 2004 TQ13, 367525, 338176
W71Rand II Obs. in New York, 1 in MPEC 2017-S96 -- 2017 PR25
104San Marcello Pistoiese Obs. in Italy, 2 in MPECs 2017-S107 & 2017-S108 -- 2017 SQ10, 2017 SP10
K96Savelli Obs., 1 in MPEC 2017-S96 -- 3122
204Schiaparelli Obs. in Italy, 3 in MPECs 2017-S106, 2017-S107 & 2017-S108 -- 2017 SQ10, 2017 SP10, 2017 SO10
587Sormano Obs. in Italy, 3 in MPECs 2017-S101, 2017-S107 & 2017-S108 -- 2017 SQ10, 2017 SP10, 2017 SH10
691Spacewatch 0.9m telescope in Arizona, 12 in MPECs 2017-S96, 2017-S97, 2017-S98, 2017-S99, 2017-S100, 2017-S101, 2017-S102, 2017-S104, 2017-S105 & 2017-S109 -- 2017 SN10, 2017 SM10, 2017 SK10, 2017 SJ10, 2017 SH10, 2017 SG10, 2017 SF10, C/2017 S2, 2017 RL1, P/2017 R1, 2017 QR, 2006 TU7
291Spacewatch 1.8m telescope in Arizona, 5 in MPECs 2017-S96 & 2017-S104 -- 2017 SM10, 2017 RL2, 2014 JN57, 2013 US3, 2005 UN157
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2017-S96 -- 2017 PS25
I52Steward Obs. Mt. Lemmon Station in Arizona, 20 in MPECs 2017-S96, 2017-S97, 2017-S98, 2017-S100, 2017-S101, 2017-S102, 2017-S104, 2017-S105, 2017-S106, 2017-S107, 2017-S108 & 2017-S109 -- 2017 SQ10, 2017 SP10, 2017 SO10, 2017 SN2, 2017 SN10, 2017 SM10, 2017 SK10, 2017 SJ2, 2017 SJ10, 2017 SH10, 2017 SG10, C/2017 S2, 2017 RX1, 2017 RW2, 2017 RP2, 2017 RP15, 2017 RO16, 2017 RN15, 2017 RB15, P/2017 R1
926Tenagra II Obs. in Arizona, 14 in MPECs 2017-S96, 2017-S100, 2017-S101, 2017-S102, 2017-S104, 2017-S105, 2017-S106, 2017-S107, 2017-S108 & 2017-S109 -- 2017 SQ10, 2017 SP10, 2017 SO10, 2017 SN10, 2017 SM10, 2017 SK10, 2017 SJ10, 2017 SH10, 2017 SG10, 2017 RQ15, 2017 HJ1, 2015 BF4, 2014 WP202, 2013 TF6
B18Terskol Obs. in Russia, 1 in MPEC 2017-S105 -- 2017 SN10
H32Texas A&M Physics Obs. in Texas, 1 in MPEC 2017-S96 -- 3122
Z52The Studios Obs., 2 in MPEC 2017-S96 -- 68950, 3122
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-S96 -- 2011 JW10
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 22 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 RN16JPL Sentry15302076-2115235.032131e-05-6.55-6.900JPL: Computed at 08:09 today Pacific time based on 12 observations spanning 4.9034 days (2017-Sep-15.40527 to 2017-Sep-20.308696). Diameter approximately 0.005 km. from weighted mean H=29.06.
2017 RV2JPL Sentry15302082-2117370.000108444891-4.91-5.740JPL: Computed at 08:09 today Pacific time based on 120 observations spanning 7.9406 days (2017-Sep-14.43497 to 2017-Sep-22.37557). Diameter approximately 0.020 km. from weighted mean H=26.18.
NEODyS15302071-2117576.92e-05-5.09-5.640NEODyS: "Based on 115 optical observations (of which 2 are rejected as outliers) from 2017-09-14.436 to 2017-09-21.338."
2017 RU2NEODyS1530R E M O V E D-
2017 RK2NEODyS15302083-211729.14e-06-6.74-6.740NEODyS: "Based on 29 optical observations (of which 1 are rejected as outliers) from 2017-09-13.318 to 2017-09-19.489."
2017 QS16NEODyS15302063-207524.3e-08-7.54-7.570NEODyS: "Based on 90 optical observations (of which 0 are rejected as outliers) from 2017-08-20.427 to 2017-09-20.596."
2017 MB1JPL Sentry16302098-209811.950e-07-3.46-3.460JPL: Computed at 09:15 today Pacific time based on 433 observations spanning 35.795 days (2017-Jun-19.31418 to 2017-Jul-25.109676). Diameter approximately 0.700 km. from weighted mean H=18.80.
2012 TC4NEODyS15302050-2112717.86e-04-4.19-4.640NEODyS: "Based on 295 optical observations (of which 1 are rejected as outliers) from 2012-10-04.468 to 2017-09-19.282."

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 22 September '17

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

1848Generated Traffic Report
1801Grabbed MPEC 2017-S109 - 2017 SK10 - see above
1710Grabbed MPEC 2017-S100 - 2017 SG10 - see above
Grabbed MPEC 2017-S101 - 2017 SH10 - see above
Grabbed MPEC 2017-S102 - 2017 SJ10 - see above
Grabbed MPEC 2017-S103 - 2017 SL10 - see above
Grabbed MPEC 2017-S104 - 2017 SM10 - see above
Grabbed MPEC 2017-S105 - 2017 SN10 - see above
Grabbed MPEC 2017-S106 - 2017 SO10 - see above
Grabbed MPEC 2017-S107 - 2017 SP10 - see above
Grabbed MPEC 2017-S108 - 2017 SQ10 - see above
1630Noted that JPL Sentry has updated its 2017 MB1 risk assessment - see above
Grabbed MPEC 2017-S99 - 2017 SF10 - see above
1530Noted that NEODyS has updated its 2012 TC4 risk assessment - see above
Noted that NEODyS has updated its 2017 QS16 risk assessment - see above
Noted that NEODyS has posted 2017 RK2 as an impact risk - see above
Noted that JPL Sentry has updated its 2017 RN16 risk assessment - see above
Noted that NEODyS has removed 2017 RU2 as an impact risk - see above
Noted that JPL Sentry has updated its 2017 RV2 risk assessment - see above
Noted that NEODyS has updated its 2017 RV2 risk assessment - see above
Grabbed MPEC 2017-S96 - Daily Orbit Update - see above
Grabbed MPEC 2017-S97 - Comet P/2017 R1 (Panstarrs) - see above
Grabbed MPEC 2017-S98 - Comet C/2017 S2 (Panstarrs) - see above