Contents  on 27 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 27 August '17

Six objects reported inside ten LD

Six asteroids are reported to be within ten lunar distances (LD) of our planet today. Nearest are Moon-buzzing 2017 QQ17, outbound from 4.02 to 8.70 LD, and 2017 QN1, which is inbound from 9.00 to 7.27 LD.

Earth passage I D ~Size Distance Today  Notes
1.02 LD yesterday2017 QQ17 8 m  4.02 to 8.70 LD Moon buzzer - DOU
1.44 LD Aug. 232017 QF3 8 m  8.78 to 11.60 LD exits ten LD, risk
3.52 LD Aug. 222017 QS16 31 m  8.68 to 10.28 LD exits ten LD, risk
4.82 LD Aug. 312017 QQ1 37 m  9.89 from 11.94 LD enters ten LD
5.47 LD Aug. 302017 QN1 16 m  7.27 from 9.00 LD
5.50 LD Aug. 222017 PV25 40 m  8.32 to 9.46 LD
Approaching (sorted by 10-LD bubble entry date)
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 1654 UTC with follow-up in today's DOU MPEC for distant 152664 1998 FW4 and departed objects 2017 QW1 and radar target 2017 CS, along with new observations of 2017 QQ17, which has now moved into the daytime sky, extending its observing arc from 2.45 to 2.82 days.

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. "Moon buzzing" is used here to describe an object that passed the Moon at less than one Earth-Moon distance but did not enter the Earth-Moon system during this passage, and "distant" describes 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 27 August '17

The MPC's NEO Confirmation Page has 61 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 61 objects listed. Of these, 24 were "one nighters."

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 27 August '17

Minor Planet Electronic Circulars

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

<< DOU on 27 Aug. '17 >>  MPEC 2017-Q129 - "12:03 UT" - Daily Orbit Update

Observers  on 27 August '17

A total of 20 observers appear in today's MPEC.

CodeObserver / observatory
C97Al-Fulaij Obs., 5 in MPEC 2017-Q129 -- 90075, 68950, 190166, 153415, 6053
H21Astronomical Research Obs. Westfield in Illinois, 14 in MPEC 2017-Q129 -- 2017 QW17, 2017 QW1, 2017 QT17, 2017 QS, 2017 QR17, 2017 QR1, 2017 QG3, 2017 QC3, 2017 QB3, 2017 QB2, 2017 PC27, 2017 OC, 2017 NM6, 2017 CS
T05ATLAS Haleakala in Hawaii, 7 in MPEC 2017-Q129 -- 2017 PT25, 2008 MH1, 90075, 85709, 265962, 20460, 152664
T08ATLAS Mauna Loa in Hawaii, 3 in MPEC 2017-Q129 -- 2017 PJ26, 2017 OD1, 2014 SR339
C77Bernezzo Obs. in Italy, 1 in MPEC 2017-Q129 -- 2017 QS17
K65Cesena Obs. in Italy, 1 in MPEC 2017-Q129 -- 2017 OD1
G58Chabot Obs. in northern California, 1 in MPEC 2017-Q129 -- 2017 QB2
006Fabra Obs. in Spain, 1 in MPEC 2017-Q129 -- 6053
Z80Northolt Branch Obs. in England, 1 in MPEC 2017-Q129 -- 2017 PL26
G34Oberfrauendorf Obs. in Germany, 1 in MPEC 2017-Q129 -- 6053
583Odessa-Mayaki Obs. in Ukraine, 3 in MPEC 2017-Q129 -- 2014 YC15, 496018, 6053
F51Pan-STARRS 1 (PS1) in Hawaii, 8 in MPEC 2017-Q129 -- 2017 QW1, 2017 QK, 2017 GU6, 2016 AG165, 2015 RT83, 2000 QU7, 159699, 142561
W98Polonia Obs. in Chile, 1 in MPEC 2017-Q129 -- 96744
D29Purple Mtn. Obs. Xuyi Station in China, 6 in MPEC 2017-Q129 -- 2017 PC27, 2004 TQ13, 90075, 483422, 163454, 143624
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2017-Q129 -- 2017 QQ17
G40'program code "'" (16) via Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-Q129 -- 2017 QR17
Y00SONEAR in Brazil, 1 in MPEC 2017-Q129 -- 141874
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2017-Q129 -- 2329
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-Q129 -- 2015 RN35
T14UH/Tholen NEO Follow-Up CFH Telescope in Hawaii, 1 in MPEC 2017-Q129 -- 2017 QQ17
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 27 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 PL26NEODyS16042081-2116334.63e-06-4.34-4.640NEODyS: "Based on 174 optical observations (of which 7 are rejected as outliers) from 2017-06-21.528 to 2017-08-27.000."
JPL Sentry15152081-2116341.06486645e-05-3.98-4.310JPL: Computed at 07:58 today Pacific time based on 172 observations spanning 66.472 days (2017-Jun-21.52716 to 2017-Aug-26.999623). Diameter approximately 0.120 km. from weighted mean H=22.25.
2015 RN35NEODyS16042074-211494.44e-06-4.71-5.050NEODyS: "Based on 58 optical observations (of which 0 are rejected as outliers) from 2015-09-09.517 to 2016-03-07.322."
JPL Sentry15152065-209251.025142e-05-4.30-4.470JPL: Computed at 08:00 today Pacific time based on 58 observations spanning 179.81 days (2015-Sep-09.51581 to 2016-Mar-07.32122). Diameter approximately 0.085 km. from weighted mean H=23.00.

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 27 August '17

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

1654Generated Traffic Report
1604Noted that NEODyS has updated its 2015 RN35 risk assessment - see above
Noted that NEODyS has updated its 2017 PL26 risk assessment - see above
1515Noted that JPL Sentry has updated its 2015 RN35 risk assessment - see above
Noted that JPL Sentry has updated its 2017 PL26 risk assessment - see above
Grabbed MPEC 2017-Q129 - Daily Orbit Update - see above