Contents  on 12 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 12 September '17

Two objects reported inside ten LD

There are two asteroids reported less than ten lunar distances (LD) from Earth today. 2017 RB heads away from 7.58 to 8.60 LD and intruder 2017 QB35 from 7.67 to 8.54 LD.

Earth passage I D ~Size Distance Today  Notes
0.93 LD Sept. 32017 QB35 5 m  7.67 to 8.54 LD intruder
3.78 LD Sept. 62017 RB 8 m  7.58 to 8.60 LD
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
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 1750 UTC with new observation from May 2011 in today's DOU MPEC for NHATS target 2011 HN24, adding 16.12 days to its former 10.85-day observing arc.



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 12 September '17

The MPC's NEO Confirmation Page has 52 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 52 objects listed. Of these, 29 were "one nighters." So far The Tracking News has counted a total of 64 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 12 September '17

Minor Planet Electronic Circulars

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


<< DOU on 12 Sept. '17 >>  MPEC 2017-R50 - "12:03 UT" - Daily Orbit Update


MPEC 2017-R49 - "11:11 UT" - 2017 RM1


MPEC 2017-R48 - "11:07 UT" - 2017 RL1


MPEC 2017-R47 - "11:04 UT" - 2017 RK1

Observers  on 12 September '17

A total of 32 observers appear in today's MPECs.

CodeObserver / observatory
C97Al-Fulaij Obs., 1 in MPEC 2017-R50 -- 190166
H21Astronomical Research Obs. Westfield in Illinois, 23 in MPECs 2017-R47, 2017-R48, 2017-R49 & 2017-R50 -- 2017 RM1, 2017 RL1, 2017 RK1, 2017 QY34, 2017 QV34, 2017 QS17, 2017 QS, 2017 QR16, 2017 QQ35, 2017 QM35, 2017 QL35, 2017 PT25, 2017 PS25, 2017 PR25, 2017 PJ26, 2017 MV2, 2017 MU8, 2017 MF4, 2017 CN1, 2008 MH1, 2004 TK10, 483422, 216115
T05ATLAS Haleakala in Hawaii, 23 in MPEC 2017-R50 -- 2017 PS25, 2016 AA9, 2014 YC15, 2006 KA40, 2004 TQ13, 90075, 52762, 496018, 495848, 494975, 483459, 333888, 329520, 326388, 265962, 190208, 162186, 143624, 142464, 142040, 11500, 100926, 4197
T08ATLAS Mauna Loa in Hawaii, 6 in MPEC 2017-R50 -- 2017 OP68, 2017 OD1, 142561, 141874, 137799, 11398
073Bucharest Obs. in Romania, 1 in MPEC 2017-R50 -- 3122
006Fabra Obs. in Spain, 2 in MPEC 2017-R50 -- 6053, 3122
J95Great Shefford Obs. in England, 3 in MPECs 2017-R47, 2017-R48 & 2017-R49 -- 2017 RM1, 2017 RL1, 2017 RK1
Q62|Sergio Foglia in Italy via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-R50 -- 154589
W19Kalamazoo Obs. in Michigan, 1 in MPEC 2017-R50 -- 6053
695^Spacewatch via Kitt Peak Natl. Obs. in Arizona, 1 in MPEC 2017-R48 -- 2017 RL1
H01Magdalena Ridge Obs. (MRO) in New Mexico, 2 in MPECs 2017-R47 & 2017-R49 -- 2017 RM1, 2017 RK1
118Modra Obs. in Slovakia, 1 in MPEC 2017-R47 -- 2017 RK1
K74Muensterschwarzach Obs. in Germany, 6 in MPEC 2017-R50 -- 2014 YC15, 90075, 265962, 6053, 5143, 3122
0895N.V. Maigurova via Nikolaev Obs. in Ukraine, 3 in MPEC 2017-R50 -- 2014 YC15, 237805, 6053
J69North Obs. in England, 1 in MPEC 2017-R47 -- 2017 RK1
Z80Northolt Branch Obs. in England, 1 in MPEC 2017-R50 -- 3122
G34Oberfrauendorf Obs. in Germany, 3 in MPEC 2017-R50 -- 90075, 265962, 3122
J43Oukaimeden Obs. in Morocco, 1 in MPEC 2017-R50 -- 329520
F51Pan-STARRS 1 (PS1) in Hawaii, 7 in MPECs 2017-R47, 2017-R48, 2017-R49 & 2017-R50 -- 2017 RM1, 2017 RL1, 2017 RK1, 2010 SA12, 2010 DB34, 153249, 6611
Z38Picoto Obs., 1 in MPEC 2017-R50 -- 6053
D29Purple Mtn. Obs. Xuyi Station in China, 4 in MPEC 2017-R50 -- 190166, 7336, 5332, 3288
L04ROASTERR-1 in Romania, 1 in MPEC 2017-R50 -- 3122
K14Sencelles Obs. in Spain, 1 in MPEC 2017-R50 -- 2017 PS25
G40!M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-R50 -- 2017 QV34
Y00SONEAR in Brazil, 2 in MPEC 2017-R50 -- 2017 PJ26, 2017 OD1
691Spacewatch 0.9m telescope in Arizona, 5 in MPECs 2017-R49 & 2017-R50 -- 2017 RM1, 2017 QG3, 2017 PJ26, 2017 HV3, 1989 UP
291Spacewatch 1.8m telescope in Arizona, 4 in MPECs 2017-R48 & 2017-R50 -- 2017 RV, 2017 RL1, 2017 FE1, 2004 EK1
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2017-R50 -- 3122
W34Squirrel Valley Obs. in North Carolina, 2 in MPECs 2017-R47 & 2017-R50 -- 2017 RK1, 496005
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-R50 -- 2011 HN24
T14UH/Tholen NEO Follow-Up CFH Telescope in Hawaii, 1 in MPEC 2017-R50 -- 2017 OA
718Wiggins Obs. in Utah, 1 in MPEC 2017-R50 -- 3122
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 12 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
2012 TC4NEODyS16002050-2112651.5e-03-3.79-3.930NEODyS: "Based on 266 optical observations (of which 0 are rejected as outliers) from 2012-10-04.468 to 2017-09-11.166."
2008 EM68JPL Sentry18022017-211611131.35406378e-05-5.13-5.470JPL: Computed at 00:27 April 7th Pacific time based on 12 observations spanning .11019 days (2008-Mar-08.25164 to 2008-Mar-08.36183). Diameter approximately 0.010 km. from weighted mean H=27.72.

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 12 September '17

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

1802Noted that JPL Sentry has updated its 2008 EM68 risk assessment - see above
1750Generated Traffic Report
1600Noted that NEODyS has updated its 2012 TC4 risk assessment - see above
Grabbed MPEC 2017-R47 - 2017 RK1 - see above
Grabbed MPEC 2017-R48 - 2017 RL1 - see above
Grabbed MPEC 2017-R49 - 2017 RM1 - see above
Grabbed MPEC 2017-R50 - Daily Orbit Update - see above