Contents  on 25 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 25 August '17

Four objects reported inside ten LD

Today four Solar-System small bodies are known to be within ten lunar distances (LD) of our home world. Closest is risk-listed 2017 QF3, outbound from 3.30 to 5.99 LD.

Earth passage I D ~Size Distance Today  Notes
1.44 LD Aug. 232017 QF3 8 m  3.30 to 5.99 LD risk
3.52 LD Aug. 222017 QS16 31 m  5.70 to 7.14 LD risk - DOU
5.50 LD Aug. 222017 PV25 40 m  6.44 to 7.30 LD
9.10 LD today2017 QJ2 21 m  9.10 LD Earth closest at 0208 UTC
Approaching (sorted by 10-LD bubble entry date)
5.47 LD Aug. 302017 QN1 16 m  < 10 LD tomorrow
4.82 LD Aug. 312017 QQ1 37 m  < 10 LD Aug. 27
7.87 LD Sept. 291989 VB 389 m  < 10 LD Sept. 25
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 1748 UTC with additional observation of 2017 QS16 in today's DOU MPEC along with prediscovery observation of risk-listed NHATS target 2017 FW128 from March, adding 10.04 days to its previous 5.96-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 25 August '17

The MPC's NEO Confirmation Page has 65 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 65 objects listed. Of these, 27 were "one nighters." So far The Tracking News has counted a total of 71 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 25 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.

MPEC 2017-Q116 - "13:57 UT" - Comet P/2007 RS41 = 2017 Q2 (LONEOS)

MPEC 2017-Q115 - "13:27 UT" - Comet P/2012 T2 = 2017 O3 (Panstarrs)

<< DOU on 25 Aug. '17 >>  MPEC 2017-Q114 - "12:04 UT" - Daily Orbit Update

Observers  on 25 August '17

A total of 23 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 14 in MPEC 2017-Q114 -- 2017 QY2, 2017 QF17, 2017 QD17, 2017 OY67, 2017 MD4, 2017 JD3, 2017 FS64, 2015 PN307, 29075, 237805, 190788, 7336, 2329, 1980
T05ATLAS Haleakala in Hawaii, 4 in MPEC 2017-Q114 -- 2017 MY3, 242211, 159467, 137799
T08ATLAS Mauna Loa in Hawaii, 14 in MPEC 2017-Q114 -- 2017 PT25, 2008 MH1, 96744, 90075, 496018, 422699, 333888, 326388, 265962, 237805, 143624, 142464, 142040, 4197
W96Campo Catino Austral Obs. in Chile, 1 in MPEC 2017-Q116 -- P/2017 Q2
703Catalina Sky Survey in Arizona, 1 in MPEC 2017-Q116 -- P/2007 RS41
J27El Guijo Obs. in Spain, 1 in MPEC 2017-Q114 -- 68950
I115program code 5 via Gemini South Obs. in Chile, 1 in MPEC 2017-Q115 -- P/2017 O3
Q62|Sergio Foglia in Italy via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-Q114 -- 3122
704LINEAR in New Mexico, 1 in MPEC 2017-Q116 -- P/2007 RS41
699LONEOS in Arizona, 1 in MPEC 2017-Q116 -- P/2007 RS41
568_Marco Micheli on Mauna Kea in Hawaii, 1 in MPEC 2017-Q116 -- P/2017 Q2
108Montelupo Obs. in Italy, 4 in MPEC 2017-Q114 -- 496018, 422699, 190166, 6053
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2017-Q116 -- P/2007 RS41
644NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2017-Q114 -- 2002 TD58
F51Pan-STARRS 1 (PS1) in Hawaii, 18 in MPECs 2017-Q114 & 2017-Q116 -- 2017 QR, 2017 QF17, P/2017 Q2, 2017 PS25, 2017 PM26, 2017 PF, 2017 MB9, 2017 FW128, 2017 BM31, 2003 QW30, 447903, 410622, 397237, 333480, 190166, 163250, 138911, 3288
W98Polonia Obs. in Chile, 1 in MPEC 2017-Q114 -- 142561
L04ROASTERR-1 in Romania, 2 in MPEC 2017-Q114 -- 2017 PS25, 2017 OT18
G403Tony Evans in Portugal via Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-Q114 -- 2017 NL6
I33SOAR in Chile, 1 in MPEC 2017-Q115 -- P/2017 O3
Y00SONEAR in Brazil, 3 in MPEC 2017-Q114 -- 422699, 5143, 3288
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2017-Q116 -- P/2007 RS41
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2017-Q114 -- 2329
198Wildberg Obs. in Germany, 1 in MPEC 2017-Q114 -- 2017 QS16
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 25 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.





Notes for Today's Latest Risk Assessments
2017 QS16NEODyS1530206331.43e-07-7.01-7.320NEODyS: "Based on 82 optical observations (of which 0 are rejected as outliers) from 2017-08-20.427 to 2017-08-23.119."
2017 MB9NEODyS1530R E M O V E D-
JPL Sentry1500R E M O V E DJPL: Risk listing removed at 1449 UTC today.
2017 FW128NEODyS1530207213.4e-10-10.82-10.820NEODyS: "Based on 55 optical observations (of which 0 are rejected as outliers) from 2017-03-20.340 to 2017-04-05.343."

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 25 August '17

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

1748Generated Traffic Report
1530Noted that NEODyS has updated its 2017 FW128 risk assessment - see above
Noted that NEODyS has removed 2017 MB9 as an impact risk - see above
Noted that NEODyS has updated its 2017 QS16 risk assessment - see above
1500Noted that JPL Sentry has removed 2017 MB9 as an impact risk - see above
Grabbed MPEC 2017-Q114 - Daily Orbit Update - see above
Grabbed MPEC 2017-Q115 - Comet P/2012 T2 = 2017 O3 (Panstarrs) - see above
Grabbed MPEC 2017-Q116 - Comet P/2007 RS41 = 2017 Q2 (LONEOS) - see above