Contents  on 7 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 7 August '17

One object reported inside ten LD

One asteroid is reported flying within ten lunar distances (LD) of our planet today. 2017 NB7 is outbound from 6.87 to 7.13 LD.

Earth passage I D ~Size Distance Today  Notes
6.83 LD yesterday2017 NB7 77 m  6.87 to 7.13 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 1854 UTC with the March recovery of dim and distant NHATS target 2011 PU1 in today's DOU MPEC along with additional observation of departed objects 2017 OZ67 and 2017 OL19 and follow-up for departed 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 on transient natural objects that approach the actually significant 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 7 August '17

The MPC's NEO Confirmation Page has 48 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 48 objects listed. Of these, eighteen were "one nighters." So far The Tracking News has counted a total of 49 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 7 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 7 Aug. '17 >>  MPEC 2017-P33 - "12:03 UT" - Daily Orbit Update

Observers  on 7 August '17

Ten observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 22 in MPEC 2017-P33 -- 2017 OR19, 2017 OK19, 2017 OJ19, 2017 OG1, 2017 OF1, 2017 OD, 2017 OC, 2017 NT6, 2017 NM6, 2017 MW4, 2017 MM7, 2017 MD3, 2017 KL3, 2017 KE5, 2017 KE3, 2017 HW48, 2017 HV3, 2017 DS35, 2017 CS, 20460, 190166, 6063
T05ATLAS Haleakala in Hawaii, 4 in MPEC 2017-P33 -- 2008 MH1, 142464, 12538, 2329
T08ATLAS Mauna Loa in Hawaii, 8 in MPEC 2017-P33 -- 2017 GQ6, 2014 YC15, 96631, 488494, 385580, 237805, 6050, 3752
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 3 in MPEC 2017-P33 -- 2017 MW7, 2017 KO4, 2017 JU2
568_Marco Micheli on Mauna Kea in Hawaii, 6 in MPEC 2017-P33 -- 2017 OZ67, 2017 OL19, 2017 OE20, 2017 OD20, 2015 CN62, 2002 ET11
Z80Northolt Branch Obs. in England, 5 in MPEC 2017-P33 -- 90075, 496018, 265962, 190166, 142561
F51Pan-STARRS 1 (PS1) in Hawaii, 8 in MPEC 2017-P33 -- 2017 MC5, 2017 FE1, 2006 NL, 2004 BW1, 436771, 222073, 154268, 142464
Z38Picoto Obs., 1 in MPEC 2017-P33 -- 11398
Y00SONEAR in Brazil, 1 in MPEC 2017-P33 -- 6053
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-P33 -- 2011 PU1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 7 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
2014 MO68JPL Sentry18492020-21162037.484516e-07-5.40-6.470JPL: Computed at 15:55 April 6th Pacific time based on 6 observations spanning .98038 days (2014-Jun-30.47333 to 2014-Jul-01.453713). Diameter approximately 0.066 km. from weighted mean H=23.56.
2012 TC4NEODyS03292050-2116494.8e-04-4.30-4.50NEODyS: "Based on 256 optical observations (of which 0 are rejected as outliers) from 2012-10-04.468 to 2017-08-05.398."

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 7 August '17

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

1854Generated Traffic Report
1849Noted that JPL Sentry has updated its 2014 MO68 risk assessment - see above
1600Grabbed MPEC 2017-P33 - Daily Orbit Update - see above
0329Noted that NEODyS has updated its 2012 TC4 risk assessment - see above