Contents  on 31 August '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 31 August '17

Four objects reported inside ten LD

Four Solar-System small bodies are reported inside ten lunar distances (LD) of our planet today. Nearest are 2017 QG18, inbound from 5.01 to 4.47 LD, and 2017 QQ1, which comes its closest to Earth this time around, reaching 4.82 LD at 1856 UTC.

Earth passage I D ~Size Distance Today  Notes
2.79 LD Sept. 22017 QR32 16 m  6.91 from 10.74 LD enters ten LD
4.36 LD Sept. 12017 QG18 12 m  4.47 from 5.01 LD DOU
4.82 LD today2017 QQ1 37 m  4.82 LD Earth closest at 1856 UTC
5.47 LD yesterday2017 QN1 16 m  5.92 to 7.18 LD
Approaching (sorted by 10-LD bubble entry date)
7.87 LD Sept. 291989 VB 389 m  < 10 LD Sept. 25 - 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

This report was generated at 1820 UTC with follow-up in today's DOU MPEC for 2017 QG18 and approaching 1989 VB, first follow-up for departed 2017 QU32, and continuing follow-up for departed objects 2017 QW1 and radar target 2017 CS.



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 31 August '17

The MPC's NEO Confirmation Page has 64 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 64 objects listed. Of these, 43 were "one nighters." So far The Tracking News has counted a total of 72 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 31 August '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.


<< DOU on 31 Aug. '17 >>  MPEC 2017-Q163 - "12:03 UT" - Daily Orbit Update


MPEC 2017-Q162 - "00:35 UT" - 2017 QP33


MPEC 2017-Q161 - "00:32 UT" - 2017 QO33

Observers  on 31 August '17

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

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 23 in MPECs 2017-Q161, 2017-Q162 & 2017-Q163 -- 2017 QY2, 2017 QW1, 2017 QR1, 2017 QP33, 2017 QO33, 2017 QE2, 2017 QC3, 2017 QB2, 2017 QB, 2017 OY67, 2017 OQ68, 2017 NT6, 2017 NM6, 2017 MV2, 2017 MU8, 2017 KT34, 2017 HV4, 2017 CS, 2011 TX8, 2004 LZ5, 67381, 475534, 190788
T05ATLAS Haleakala in Hawaii, 8 in MPEC 2017-Q163 -- 2017 PT25, 2016 AA9, 2004 TQ13, 90075, 326388, 265962, 162186, 142464
A81Balzaretto Obs. in Italy, 1 in MPEC 2017-Q163 -- 3122
C77Bernezzo Obs. in Italy, 1 in MPEC 2017-Q163 -- 3122
W96Campo Catino Austral Obs. in Chile, 1 in MPEC 2017-Q161 -- 2017 QO33
734Farpoint Obs. in Kansas, 3 in MPECs 2017-Q161, 2017-Q162 & 2017-Q163 -- 2017 QP33, 2017 QO33, 2017 MU7
F652Lothar Kurtze in Germany via Faulkes Telescope North in Hawaii, 1 in MPEC 2017-Q161 -- 2017 QO33
J95Great Shefford Obs. in England, 2 in MPEC 2017-Q163 -- 2017 QP33, 2017 PY24
G48Harlingten Research Obs. in New Mexico, 2 in MPEC 2017-Q163 -- 2017 PS25, 2017 OD1
H15ISON New Mexico Obs. in New Mexico, 1 in MPEC 2017-Q163 -- 2004 TQ13
Q62|Sergio Foglia in Italy via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-Q163 -- 1989 VB
695^Spacewatch via Kitt Peak Natl. Obs. (KPNO) in Arizona, 2 in MPEC 2017-Q163 -- 2014 WF365, 2014 SD224
246KLENOT in the Czech Republic, 2 in MPEC 2017-Q163 -- 2017 QP33, 2017 QG18
046Klet Obs. in the Czech Republic, 4 in MPEC 2017-Q163 -- 496018, 190166, 142561, 7336
Q59LCOGT Siding Spring Clamshell #2 in New South Wales, 1 in MPEC 2017-Q163 -- 2017 PV26
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2017-Q162 -- 2017 QP33
568_Marco Micheli on Mauna Kea in Hawaii, 4 in MPECs 2017-Q161 & 2017-Q163 -- 2017 QO33, 2017 QJ33, 2017 QH33, 2017 QG33
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2017-Q162 -- 2017 QP33
J69North Obs. in England, 1 in MPEC 2017-Q163 -- 3122
Z80Northolt Branch Obs. in England, 2 in MPEC 2017-Q163 -- 90075, 3122
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPECs 2017-Q161 & 2017-Q163 -- 2017 QO33, 332408
6581Dave Balam via Plaskett 1.8m Telescope in British Columbia, 1 in MPEC 2017-Q161 -- 2017 QO33
104San Marcello Pistoiese Obs. in Italy, 2 in MPECs 2017-Q161 & 2017-Q162 -- 2017 QP33, 2017 QO33
H36Sandlot Obs. in Kansas, 1 in MPEC 2017-Q161 -- 2017 QO33
033Schwarzschild Obs. in Germany, 1 in MPEC 2017-Q161 -- 2017 QO33
G409B. Lutkenhoner in Germany via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-Q161 -- 2017 QO33
587Sormano Obs. in Italy, 1 in MPEC 2017-Q161 -- 2017 QO33
691Spacewatch 0.9m telescope in Arizona, 6 in MPECs 2017-Q161 & 2017-Q163 -- 2017 QO33, 2017 QO17, 2017 QL18, 2017 QG3, 2017 OT68, 2017 NV5
291Spacewatch 1.8m telescope in Arizona, 3 in MPECs 2017-Q161 & 2017-Q163 -- 2017 QU32, 2017 QO33, 2017 QK
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2017-Q163 -- 3122
I52Steward Obs. Mt. Lemmon Station in Arizona, 1 in MPEC 2017-Q162 -- 2017 QP33
A71Stixendorf Obs. in Austria, 1 in MPEC 2017-Q161 -- 2017 QO33
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-Q163 -- 2015 RN35
I15Wishing Star Obs. in Rhode Island, 1 in MPEC 2017-Q163 -- 153415
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 31 August '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 PV26JPL Sentry1634R E M O V E DJPL: Risk listing removed at 1447 UTC today.
2015 RN35JPL Sentry19062065-209981.1605849e-05-4.27-4.480JPL #2 for the day: Computed at 12:01 today Pacific time based on 62 observations spanning 179.81 days (2015-Sep-09.51581 to 2016-Mar-07.32122). Diameter approximately 0.084 km. from weighted mean H=23.03.
2015 HW182JPL Sentry16342018-21161785.22101e-08-6.75-7.540JPL: Computed at 21:11 April 14th Pacific time based on 9 observations spanning .99990 days (2015-Apr-18.31077 to 2015-Apr-19.31067). Diameter approximately 0.031 km. from weighted mean H=25.19.

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 31 August '17

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

1906Noted that JPL Sentry has updated its 2015 RN35 risk assessment - see above
1820Generated Traffic Report
1634Noted that JPL Sentry has updated its 2015 HW182 risk assessment - see above
Noted that JPL Sentry has updated its 2015 RN35 risk assessment - see above
Noted that JPL Sentry has removed 2017 PV26 as an impact risk - see above
Grabbed MPEC 2017-Q163 - Daily Orbit Update - see above
0207Grabbed MPEC 2017-Q161 - 2017 QO33 - see above
Grabbed MPEC 2017-Q162 - 2017 QP33 - see above