Contents  on 26 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 26 September '17

Seven objects reported inside ten LD

Seven visitors are reported inside ten lunar distances (LD) of our home world today. Nearest is newly announced risk-listed intruder 2017 SS12, which is outbound from 3.18 to 5.44 LD. This small object flew by the Moon at 0.125 LD two days ago, the second closest passage in the ten-plus years of this A/CC traffic reporting and within the Moon's sphere of gravitational influence (SOI). This means it came close enough to have its orbit influenced by the Moon's mass while also being affected by Earth, which it later passed at 0.67 LD.

Earth passage I D ~Size Distance Today  Notes
0.67 LD Sept. 242017 SS12 13 m  3.18 to 5.44 LD NEW, intruder, risk - MPEC
2.76 LD Sept. 242017 ST10 7 m  4.63 to 6.51 LD
4.76 LD today2017 RB16 25 m  4.76 LD Earth closest at 0936 UTC
4.96 LD yesterday2017 RO16 10 m  4.97 to 5.40 LD
5.77 LD Sept. 222017 RB15 10 m  6.72 to 7.35 LD
7.87 LD Sept. 291989 VB 389 m  8.82 from 9.54 LD radar target
9.92 LD tomorrow2017 SS10 31 m  9.94 from 10.43 LD enters ten LD

This report was generated at 2006 UTC with the discovery of 2017 SS12 (MPEC), and with first follow-up for departed 2017 SE12 in today's DOU MPEC, along with continuing follow-up for 2012 TC4 and departed objects 2017 RS2 and radar target 2017 CS, plus astrometry from July for 441987 2010 NY65.

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
8.5   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 26 September '17

The MPC's NEO Confirmation Page has 181 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 181 objects listed. Of these, 92 were "one nighters." So far The Tracking News has counted a total of 235 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 26 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-S154 - "18:16 UT" - 2016 AU130


<< DOU on 26 Sept. '17 >>  MPEC 2017-S153 - "12:05 UT" - Daily Orbit Update


MPEC 2017-S152 - "11:42 UT" - 2017 SS12

Observers  on 26 September '17

A total of 27 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 10 in MPEC 2017-S153 -- 2017 RV15, 2017 RV1, 2017 RU15, 2017 RU1, 2017 RS2, 2017 RO2, 2017 QV34, 2017 OP68, 2017 FJ90, 2017 CS
T05ATLAS Haleakala in Hawaii, 7 in MPEC 2017-S153 -- 2017 QO17, 2017 OD1, 2017 MV2, 2014 UA192, 2002 RP28, 1998 SZ27, 7336
T08ATLAS Mauna Loa in Hawaii, 17 in MPEC 2017-S153 -- 2017 SN2, 2017 QS17, 2017 OP68, 2016 AA9, 2015 KN120, 2014 YC15, 2014 CD13, 2004 RE84, 90075, 496005, 441825, 338176, 333888, 143624, 143404, 142040, 11500
160Castelmartini Obs. in Italy, 3 in MPEC 2017-S153 -- 2017 BM31, 495331, 441987
703Catalina Sky Survey (CSS) in Arizona, 38 in MPECs 2017-S152 & 2017-S153 -- 2017 SS12, 2017 SH10, 2017 RY15, 2017 RV1, 2017 RR15, 2017 QQ32, 2017 QL18, 2017 QJ18, 2017 PR25, 2017 MY3, 2013 AP60, 2004 TD10, 2004 SS, 2002 RP28, 2001 UQ163, 2000 YG29, 1989 UP, 85709, 66146, 53319, 416584, 414990, 411201, 371336, 303250, 223456, 190166, 162566, 154268, 153415, 152770, 138911, 137199, 11405, 8035, 7336, 5786, 5143
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 4 in MPECs 2017-S153 & 2017-S154 -- 2017 ST11, 2017 QQ35, 2017 QO35, 2016 AU130
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2017-S152 -- 2017 SS12
J27El Guijo Obs. in Spain, 10 in MPEC 2017-S153 -- 2017 SN2, 2017 OP68, 2014 YC15, 2004 TQ13, 90075, 55408, 265962, 220909, 190208, 11500
006Fabra Obs. in Spain, 1 in MPEC 2017-S153 -- 3122
H06iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2017-S152 -- 2017 SS12
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2017-S152 -- 2017 SS12
K95MASTER-II Sutherland in South Africa, 1 in MPEC 2017-S153 -- 2006 KA40
568_Marco Micheli on Mauna Kea in Hawaii, 1 in MPEC 2017-S154 -- 2016 AU130
G96Mt. Lemmon Survey (MLS) in Arizona, 6 in MPEC 2017-S153 -- 2017 SU11, 2017 SL12, 53430, 482796, 294739, 153415
A24New Millennium Obs. in Italy, 13 in MPEC 2017-S153 -- 2016 WJ1, 2007 VM184, 495102, 433953, 378124, 275611, 225416, 203217, 138846, 5836, 5653, 3691, 1627
C23Olmen Obs. in Belgium, 3 in MPEC 2017-S153 -- 2017 SN2, 2017 RV1, 2017 PR25
F51Pan-STARRS 1 (PS1) in Hawaii, 30 in MPECs 2017-S152, 2017-S153 & 2017-S154 -- 2017 SS12, 2017 SM10, 2017 SJ10, 2017 SH2, 2017 SA, 2017 RM15, 2017 QE18, 2017 PS25, 2017 OJ19, 2016 AU130, 2015 VR1, 2014 WF365, 2013 TK69, 2013 SL30, 2013 RE21, 2013 PE26, 2012 TC4, 2002 RT129, 1989 UP, 414990, 407653, 381677, 355770, 338176, 18736, 162679, 139211, 138911, 11500, 106538
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 17 in MPEC 2017-S153 -- 2017 SN2, 2017 RV1, 2017 QV34, 2017 QL35, 2017 PS25, 2017 PR25, 2017 PJ26, 2017 OP68, 2017 MY3, 2017 FJ90, 2016 AA9, 2014 YC15, 2004 SS, 2004 RE84, 1989 UP, 496005, 3122
W98Polonia Obs. in Chile, 2 in MPEC 2017-S153 -- 137799, 2212
W25RMS Obs., 1 in MPEC 2017-S152 -- 2017 SS12
691Spacewatch 0.9m telescope in Arizona, 4 in MPEC 2017-S153 -- 2017 SH10, 2017 SG12, 2017 SF12, 2017 FE1
291Spacewatch 1.8m telescope in Arizona, 3 in MPEC 2017-S153 -- 2017 SE12, 2017 RF15, 2014 US192
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2017-S152 -- 2017 SS12
I52Steward Obs. Mt. Lemmon Station in Arizona, 1 in MPEC 2017-S152 -- 2017 SS12
926Tenagra II Obs. in Arizona, 1 in MPEC 2017-S152 -- 2017 SS12
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-S153 -- 136874
718Wiggins Obs. in Utah, 1 in MPEC 2017-S153 -- 3122
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 26 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 SS12JPL Sentry14252074-211361.30469e-06-7.06-7.460JPL: Computed at 07:01 today Pacific time based on 47 observations spanning 1.1563 days (2017-Sep-25.23585 to 2017-Sep-26.39213). Diameter approximately 0.013 km. from weighted mean H=27.02.
2017 SE12JPL Sentry1700R E M O V E DJPL: Risk listing removed at 1505 UTC today.

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 26 September '17

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

2006Generated Traffic Report
1902Grabbed MPEC 2017-S154 - 2016 AU130 - see above
1700Noted that JPL Sentry has removed 2017 SE12 as an impact risk - see above
1425Noted that JPL Sentry has posted 2017 SS12 as an impact risk - see above
Grabbed MPEC 2017-S152 - 2017 SS12 - see above
Grabbed MPEC 2017-S153 - Daily Orbit Update - see above