Contents  on 28 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 28 September '17

Seven objects reported inside ten LD

Today seven minor planets are reported to be within ten lunar distances (LD) of our planet, none of them nearer than five-plus LD.

Earth passage I D ~Size Distance Today  Notes
0.67 LD Sept. 242017 SS12 13 m  7.72 to 10.01 LD exits ten LD, intruder, risk
2.76 LD Sept. 242017 ST10 7 m  8.53 to 10.61 LD exits ten LD
4.76 LD Sept. 262017 RB16 25 m  5.85 to 7.30 LD
4.82 LD Sept. 262017 SU16 17 m  6.36 to 8.13 LD NEW - MPEC
4.96 LD Sept. 252017 RO16 10 m  6.36 to 7.65 LD
5.77 LD Sept. 222017 RB15 10 m  8.10 to 8.91 LD
7.87 LD tomorrow1989 VB 389 m  7.96 from 8.29 LD radar target

This report was generated at 1842 UTC with three discoveries anounced late yesterday and one early today: 2017 SS16 (MPEC, DOU) and 2017 SH16 (MPEC) are on approach, 2017 SU16 (MPEC) is outbound from 6.36 to 8.13 LD, while 2017 SR16 (MPEC) has departed after barely piercing our ten-LD traffic reporting sphere, passing Earth at 9.65 LD on September 25th. Today's DOU MPEC has follow-up for four departed objects: 2017 SE12, 2017 SS10 [first follow-up], 2017 RS2, and risk-listed 2017 RV2.

Arecibo news:  Sky & Telescope has an updated report on Arecibo Observatory, stating that "Arecibo and its team rode out the largest storm in its history, but it's still unclear what the moderate damage will mean for the radio observatory's future." Information links are given, and you can read a Google Spanish-to-English translation of the mentioned local newspaper article here.

Approaching (sorted by 10-LD bubble entry date)
9.15 LD Sept. 302017 SH16 29 m  < 10 LD tomorrow, NEW - MPEC
5.37 LD Oct. 32017 SS16 16 m  < 10 LD Sept. 30, NEW - MPEC, 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. 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 28 September '17

The MPC's NEO Confirmation Page has 151 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 151 objects listed. Of these, 67 were "one nighters." So far The Tracking News has counted a total of 172 listings on the NEOCP today.

New MPECs  on 28 September '17

Minor Planet Electronic Circulars

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


MPEC 2017-S205 - "22:02 UT" - 2017 SS17


MPEC 2017-S204 - "21:59 UT" - 2017 SR17


MPEC 2017-S203 - "21:47 UT" - 2017 SQ17


MPEC 2017-S202 - "21:45 UT" - 2017 SO17


MPEC 2017-S201 - "21:42 UT" - 2017 SN17


MPEC 2017-S200 - "21:40 UT" - 2017 SM17


MPEC 2017-S199 - "21:35 UT" - 2017 SL17


MPEC 2017-S198 - "21:30 UT" - 2017 SK17


MPEC 2017-S197 - "18:23 UT" - Comet P/2006 UR111 = 2017 S4 (Spacewatch)


<< DOU on 28 Sept. '17 >>  MPEC 2017-S196 - "12:04 UT" - Daily Orbit Update


MPEC 2017-S195 - "02:00 UT" - 2017 SU16

Observers  on 28 September '17

A total of 30 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 20 in MPECs 2017-S196, 2017-S199, 2017-S200, 2017-S201 & 2017-S205 -- 2017 SS17, 2017 SN2, 2017 SN17, 2017 SM17, 2017 SL17, 2017 SK14, 2017 RY15, 2017 RX1, 2017 RV15, 2017 RV1, 2017 RU15, 2017 RU1, 2017 RU, 2017 RS2, 2017 RR15, 2017 RQ2, 2017 RO2, 2017 QV34, 2017 QM18, 2017 OP68
T05ATLAS Haleakala in Hawaii, 8 in MPECs 2017-S196, 2017-S197 & 2017-S202 -- 2017 SO17, P/2017 S4, 2017 OP68, 2017 FJ90, 2015 KN120, 2014 YC15, 2006 KA40, 496005
T08ATLAS Mauna Loa in Hawaii, 4 in MPEC 2017-S196 -- 2017 QO17, 2017 OD1, 2017 MV2, 2002 RP28
703Catalina Sky Survey (CSS) in Arizona, 2 in MPECs 2017-S197 & 2017-S202 -- 2017 SO17, P/2017 S4
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 4 in MPECs 2017-S196 & 2017-S204 -- 2017 SR17, 2017 RL2, 2017 RG15, 2017 RC15
G58Chabot Obs. in northern California, 2 in MPECs 2017-S201 & 2017-S205 -- 2017 SS17, 2017 SN17
K26Contern Obs. in Luxembourg, 1 in MPEC 2017-S196 -- 2017 PR25
K87Dettelbach Vineyard Obs. in Germany, 1 in MPEC 2017-S196 -- 2017 SN14
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2017-S201 -- 2017 SN17
950.EURONEAR via La Palma in the Canary Islands, 1 in MPEC 2017-S196 -- 459872
K91LCOGT Sutherland A in South Africa, 1 in MPEC 2017-S204 -- 2017 SR17
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2017-S205 -- 2017 SS17
568_Marco Micheli on Mauna Kea in Hawaii, 2 in MPECs 2017-S197 & 2017-S198 -- 2017 SK17, P/2017 S4
B67Mirasteilas Obs. in Switzerland, 2 in MPEC 2017-S196 -- 2017 FJ90, 2013 AP60
G96Mt. Lemmon Survey (MLS) in Arizona, 25 in MPECs 2017-S195, 2017-S196, 2017-S197 & 2017-S205 -- 2017 SU16, 2017 SS17, 2017 SN10, 2017 RY15, 2017 RV1, 2017 RU, 2017 RR15, 2017 RK1, 2017 QW32, 2017 QG3, 2017 HS, 2017 HN3, 2013 RE21, 2012 HN13, 2007 RM133, P/2006 UR111, 2005 UN157, 1993 RA, 96744, 85709, 441825, 220839, 16960, 162998, 2201
644NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2017-S197 -- P/2006 UR111
608NEAT's USAF Haleakala telescope in Hawaii, 1 in MPEC 2017-S196 -- 2002 RN38
F51Pan-STARRS 1 (PS1) in Hawaii, 15 in MPECs 2017-S195, 2017-S196, 2017-S197, 2017-S198, 2017-S199, 2017-S200, 2017-S201, 2017-S202, 2017-S203 & 2017-S204 -- 2017 SU16, 2017 SS16, 2017 SR17, 2017 SQ17, 2017 SO17, 2017 SN17, 2017 SM17, 2017 SL17, 2017 SK17, 2017 SF14, P/2017 S4, 2017 QL35, 2010 WL, 65679, 20826
6581Dave Balam via Plaskett 1.8m Telescope in British Columbia, 5 in MPECs 2017-S196, 2017-S199, 2017-S200 & 2017-S205 -- 2017 SU14, 2017 SS17, 2017 SR14, 2017 SM17, 2017 SL17
A48Povegliano Veronese Obs. in Italy, 2 in MPEC 2017-S196 -- 2017 SN2, 2017 PJ26
W25RMS Obs., 2 in MPECs 2017-S201 & 2017-S202 -- 2017 SO17, 2017 SN17
104San Marcello Pistoiese Obs. in Italy, 2 in MPECs 2017-S195 & 2017-S201 -- 2017 SU16, 2017 SN17
C95SATINO-1 in France, 1 in MPEC 2017-S196 -- 2017 QR
691Spacewatch 0.9m telescope in Arizona, 5 in MPECs 2017-S196 & 2017-S197 -- 2017 SH10, 2017 RL2, 2017 HH, 2017 FE1, P/2006 UR111
291Spacewatch 1.8m telescope in Arizona, 7 in MPEC 2017-S196 -- 2017 SE12, 2017 RV2, 2017 RG15, 2017 RF15, 2017 QW17, 2017 QM18, 2007 PS9
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2017-S196 -- 3122
I52Steward Obs. Mt. Lemmon Station in Arizona, 4 in MPECs 2017-S195, 2017-S202, 2017-S204 & 2017-S205 -- 2017 SU16, 2017 SS17, 2017 SR17, 2017 SO17
926Tenagra II Obs. in Arizona, 7 in MPECs 2017-S196, 2017-S198, 2017-S199, 2017-S200, 2017-S201, 2017-S203 & 2017-S204 -- 2017 SS10, 2017 SR17, 2017 SQ17, 2017 SN17, 2017 SM17, 2017 SL17, 2017 SK17
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-S196 -- 2008 XQ2
718Wiggins Obs. in Utah, 1 in MPEC 2017-S196 -- 3122
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 28 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 SN14JPL Sentry16062025-207237.9929e-09-3.96-3.990JPL: Computed at 08:46 today Pacific time based on 65 observations spanning 3.6900 days (2017-Sep-24.11907 to 2017-Sep-27.80904). Diameter approximately 0.730 km. from weighted mean H=18.33.
2017 SM14NEODyS15362027-2114185.85e-09-3.69-3.790NEODyS: "Based on 17 optical observations (of which 0 are rejected as outliers) from 2017-09-23.480 to 2017-09-26.510."
2017 SH14NEODyS1536210716.71e-11-10.40-10.40NEODyS: "Based on 13 optical observations (of which 0 are rejected as outliers) from 2017-09-25.234 to 2017-09-27.134."
2017 SE14NEODyS15362026-2086151.52e-08-3.93-4.240NEODyS: "Based on 13 optical observations (of which 0 are rejected as outliers) from 2017-09-23.439 to 2017-09-26.515."
2017 SS12NEODyS15362074-2117222.11e-06-6.85-7.290NEODyS: "Based on 56 optical observations (of which 6 are rejected as outliers) from 2017-09-25.237 to 2017-09-26.813."
2017 SQ2NEODyS1536209212.28e-07-7.32-7.320NEODyS: "Based on 26 optical observations (of which 0 are rejected as outliers) from 2017-09-18.347 to 2017-09-26.509."
2017 RV2JPL Sentry15362082-2117410.000109294083-4.93-5.750JPL: Computed at 08:06 today Pacific time based on 126 observations spanning 13.057 days (2017-Sep-14.43497 to 2017-Sep-27.49213). Diameter approximately 0.019 km. from weighted mean H=26.21.
NEODyS15362071-2117394.82e-05-5.27-5.710NEODyS: "Based on 123 optical observations (of which 10 are rejected as outliers) from 2017-09-14.436 to 2017-09-26.462."
2016 WJ1NEODyS15362104-211585.59e-07-4.67-5.330NEODyS: "Based on 401 optical observations (of which 7 are rejected as outliers) from 2003-07-04.606 to 2017-07-31.349."
2012 TC4NEODyS15362073-2112245.07e-04-4.43-4.550NEODyS: "Based on 314 optical observations (of which 9 are rejected as outliers) from 2012-10-04.468 to 2017-09-26.320."

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 28 September '17

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

2230Grabbed MPEC 2017-S204 - 2017 SR17 - see above
Grabbed MPEC 2017-S205 - 2017 SS17 - see above
2200Grabbed MPEC 2017-S199 - 2017 SL17 - see above
Grabbed MPEC 2017-S200 - 2017 SM17 - see above
Grabbed MPEC 2017-S201 - 2017 SN17 - see above
Grabbed MPEC 2017-S202 - 2017 SO17 - see above
Grabbed MPEC 2017-S203 - 2017 SQ17 - see above
2135Grabbed MPEC 2017-S198 - 2017 SK17 - see above
1842Generated Traffic Report
1830Grabbed MPEC 2017-S197 - Comet P/2006 UR111 = 2017 S4 (Spacewatch) - see above
1606Noted that JPL Sentry has updated its 2017 SN14 risk assessment - see above
1536Noted that NEODyS has updated its 2012 TC4 risk assessment - see above
Noted that NEODyS has updated its 2016 WJ1 risk assessment - 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
Noted that NEODyS has posted 2017 SE14 as an impact risk - see above
Noted that NEODyS has posted 2017 SH14 as an impact risk - see above
Noted that NEODyS has posted 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
Grabbed MPEC 2017-S196 - Daily Orbit Update - see above
0307Grabbed MPEC 2017-S195 - 2017 SU16 - see above