Contents  on 13 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 13 September '17

Two objects reported inside ten LD

Two transient natural objects are reported flying within ten lunar distances (LD) of Earth today. Intruder 2017 QB35 is outbound from 8.54 to 9.42 LD and 2017 RB is moves away from 8.60 to 9.65 LD.

Earth passage I D ~Size Distance Today  Notes
0.93 LD Sept. 32017 QB35 5 m  8.54 to 9.42 LD intruder
3.78 LD Sept. 62017 RB 8 m  8.60 to 9.65 LD
Approaching (sorted by 10-LD bubble entry date)
7.87 LD Sept. 291989 VB 389 m  < 10 LD Sept. 25, radar target - DOU
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

This report was generated at 2010 UTC with the June recovery of distant 2003 DZ15 and first follow-up for departed objects 2017 RC (11.03 days added to 1.00-day observing arc) and 2017 NB7 (47.59 days added to 0.53!), all in today's DOU MPEC along with continuing follow-up for approaching radar targets 2012 TC4 and 1989 VB and for departed 2017 QR35, plus observation from August of 2017 QG18.



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. "Distant" is used here to describe an object that has come within ten LD since A/CC began these traffic reports (2007) but is not now so close. 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 13 September '17

The MPC's NEO Confirmation Page has 70 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 70 objects listed. Of these, 46 were "one nighters." So far The Tracking News has counted a total of 77 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 13 September '17

Minor Planet Electronic Circulars

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


<< DOU on 13 Sept. '17 >>  MPEC 2017-R52 - "12:03 UT" - Daily Orbit Update


MPEC 2017-R51 - "03:00 UT" - 2016 QF86

Observers  on 13 September '17

A total of 34 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 6 in MPEC 2017-R52 -- 2017 QS17, 2017 PV26, 2017 OT18, 2017 NL6, 2017 MU8, 216115
T05ATLAS Haleakala in Hawaii, 2 in MPEC 2017-R52 -- 333908, 153415
T08ATLAS Mauna Loa in Hawaii, 9 in MPEC 2017-R52 -- 2017 PJ26, 96631, 87684, 66146, 53319, 416584, 337228, 141670, 3753
160Castelmartini Obs. in Italy, 9 in MPEC 2017-R52 -- 2017 QB, 2017 PT25, 2017 PL26, 68348, 496018, 495848, 190166, 142040, 12538
W847David Gerdes in Michigan via DECam in Chile, 1 in MPEC 2017-R51 -- 2016 QF86
J27El Guijo Obs. in Spain, 7 in MPEC 2017-R52 -- 2014 YC15, 90075, 68950, 496018, 326388, 265962, 142464
G48Harlingten Research Obs. in New Mexico, 3 in MPEC 2017-R52 -- 2017 RL, 2017 PJ26, 2017 OP68
Q622Marian Urbanik in Slovakia via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-R52 -- 1989 VB
W19Kalamazoo Obs. in Michigan, 1 in MPEC 2017-R52 -- 90075
J38La Vara Obs. in Spain, 1 in MPEC 2017-R52 -- 3122
W85LCOGT Cerro Tololo A in Chile, 3 in MPEC 2017-R52 -- 2011 PT, 2011 KE3, 162183
W86LCOGT Cerro Tololo B in Chile, 1 in MPEC 2017-R52 -- 2011 PT
W87LCOGT Cerro Tololo C in Chile, 2 in MPEC 2017-R52 -- 2001 HB, 495829
V37LCOGT Fort Davis in Texas, 1 in MPEC 2017-R52 -- 2001 HB
K91LCOGT Sutherland A in South Africa, 2 in MPEC 2017-R52 -- 494710, 162183
K92LCOGT Sutherland B in South Africa, 2 in MPEC 2017-R52 -- 495829, 154590
K93LCOGT Sutherland C in South Africa, 1 in MPEC 2017-R52 -- 2003 DZ15
Z21LCOGT Tenerife Aqawan A#1 in the Canary Islands, 1 in MPEC 2017-R52 -- 3122
K38M57 Obs. in Italy, 1 in MPEC 2017-R52 -- 3122
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2017-R52 -- 2012 TC4
K74Muensterschwarzach Obs. in Germany, 2 in MPEC 2017-R52 -- 190166, 7336
F51Pan-STARRS 1 (PS1) in Hawaii, 18 in MPEC 2017-R52 -- 2017 RV, 2017 QW17, 2017 QG3, 2017 HN49, 2015 KN120, 2014 QL433, 2014 NF63, 2012 TF53, 2012 CO46, 2008 MH1, 488494, 476187, 31221, 23548, 163191, 162913, 105141, 100756
D29Purple Mtn. Obs. Xuyi Station in China, 4 in MPEC 2017-R52 -- 2003 QW30, 96631, 162566, 138911
W25RMS Obs., 5 in MPEC 2017-R52 -- 2017 QG18, 2017 NL6, 480858, 223456, 190208
K61Rokycany Obs. in the Czech Republic, 1 in MPEC 2017-R52 -- 2017 PR25
Y00SONEAR in Brazil, 1 in MPEC 2017-R52 -- 7336
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2017-R52 -- 2017 QR
291Spacewatch 1.8m telescope in Arizona, 2 in MPEC 2017-R52 -- 2017 QC3, 2006 QT89
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2017-R52 -- 3122
I52Steward Obs. Mt. Lemmon Station in Arizona, 14 in MPEC 2017-R52 -- 2017 RU, 2017 QX35, 2017 QT35, 2017 QS32, 2017 QR35, 2017 QP33, 2017 QO2, 2017 QN33, 2017 QJ18, 2017 PU25, 2017 PN26, 2017 OD20, 2017 NB7, 2017 MC5
H32Texas A&M Physics Obs. in Texas, 1 in MPEC 2017-R52 -- 3122
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-R52 -- 2011 GA3
T14UH/Tholen NEO Follow-Up CFH Telescope in Hawaii, 1 in MPEC 2017-R52 -- 2017 RC
718Wiggins Obs. in Utah, 1 in MPEC 2017-R52 -- 3122
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 13 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 RLJPL Sentry1633R E M O V E DJPL: Risk listing removed at 1451 UTC today.
2017 RCJPL Sentry16332086-2117264.1540306e-05-6.12-6.600JPL: Computed at 08:01 today Pacific time based on 30 observations spanning 12.029 days (2017-Sep-01.38514 to 2017-Sep-13.414576). Diameter approximately 0.009 km. from weighted mean H=27.91.
2017 PL26JPL Sentry16332081-2116164.0656649e-06-4.35-4.650JPL: Computed at 07:57 today Pacific time based on 205 observations spanning 68.296 days (2017-Jun-21.52716 to 2017-Aug-28.82329). Diameter approximately 0.130 km. from weighted mean H=22.14.
2008 EM68JPL Sentry16332017-211611111.35396612e-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 13 September '17

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

2010Generated Traffic Report
1633Noted that JPL Sentry has updated its 2008 EM68 risk assessment - see above
Noted that JPL Sentry has updated its 2017 PL26 risk assessment - see above
Noted that JPL Sentry has updated its 2017 RC risk assessment - see above
Noted that JPL Sentry has removed 2017 RL as an impact risk - see above
Grabbed MPEC 2017-R52 - Daily Orbit Update - see above
0343Grabbed MPEC 2017-R51 - 2016 QF86 - see above