Contents  on 3 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 3 September '17

Six objects reported inside ten LD

There are six minor planets reported inside ten lunar distances (LD) of Earth today. Nearest is intruder 2017 QB35, which skims through the Earth-Moon system, passing our planet at 0.93 LD and the Moon at 0.95 LD. Much further out, newly announced 2017 RB is inbound from 5.44 to 4.67 LD and 2017 QR35 moves away from 8.37 to 9.44 LD.

Earth passage I D ~Size Distance Today  Notes
0.93 LD today2017 QB35 5 m  0.93 LD intruder today, inside Earth SOI, Earth closest at
0840 UTC, Moon closest 0.95 LD at 0358 UTC
2.79 LD yesterday2017 QR32 16 m  3.31 to 6.47 LD
3.78 LD Sept. 62017 RB 8 m  4.67 from 5.44 LD NEW - MPEC
4.36 LD Sept. 12017 QG18 12 m  4.79 to 5.57 LD
4.82 LD Aug. 312017 QQ1 37 m  6.97 to 8.77 LD
6.42 LD Aug. 302017 QR35 30 m  8.37 to 9.44 LD NEW - MPEC, DOU
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 1712 UTC with the discoveries of 2017 QR35 and 2017 RB (see accompanying table), and of already departed 2017 RC (MPEC), which went past us at 2.41 LD on August 28th. Today's DOU MPEC carries astrometry from February for 2017 CP32, 2017 CS, 2017 DB, and 2017 DF.



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 3 September '17

The MPC's NEO Confirmation Page has 66 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 66 objects listed. Of these, 37 were "one nighters." So far The Tracking News has counted a total of 75 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 3 September '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-R28 - "16:29 UT" - 2017 RF


MPEC 2017-R27 - "16:26 UT" - 2017 QX35


<< DOU on 3 Sept. '17 >>  MPEC 2017-R26 - "12:03 UT" - Daily Orbit Update

Observers  on 3 September '17

A total of 24 observers appear in today's MPECs.

CodeObserver / observatory
C97Al-Fulaij Obs., 5 in MPEC 2017-R26 -- 90075, 153415, 5143, 3288, 3122
H21Astronomical Research Obs. Westfield in Illinois, 15 in MPECs 2017-R26, 2017-R27 & 2017-R28 -- 2017 RF, 2017 QX35, 2017 QW17, 2017 QP17, 2017 QN18, 2017 QM18, 2017 PU25, 2017 PT25, 2017 PE, 2017 PB27, 2017 PA27, 2017 OQ68, 2017 NV5, 2017 MO7, 2017 FE1
T05ATLAS Haleakala in Hawaii, 6 in MPEC 2017-R26 -- 96631, 68348, 223456, 20826, 12538, 1980
T08ATLAS Mauna Loa in Hawaii, 4 in MPEC 2017-R26 -- 68950, 422699, 294739, 6053
A81Balzaretto Obs. in Italy, 1 in MPEC 2017-R26 -- 3122
160Castelmartini Obs. in Italy, 7 in MPEC 2017-R26 -- 2017 PS25, 53319, 329520, 322763, 162011, 4197, 3753
V06Catalina Sky Survey Kuiper Telescope in Arizona, 1 in MPEC 2017-R26 -- 2017 QL35
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2017-R28 -- 2017 RF
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 4 in MPEC 2017-R26 -- 2017 OJ19, 87684, 299582, 141874
Q62|Sergio Foglia in Italy via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-R26 -- 3122
695^Spacewatch via Kitt Peak Natl. Obs. in Arizona, 1 in MPEC 2017-R26 -- 2006 TU7
J38La Vara Obs. in Spain, 1 in MPEC 2017-R26 -- 3122
H01Magdalena Ridge Obs. (MRO) in New Mexico, 2 in MPECs 2017-R27 & 2017-R28 -- 2017 RF, 2017 QX35
G96Mt. Lemmon Survey (MLS) in Arizona, 12 in MPECs 2017-R26, 2017-R27 & 2017-R28 -- 2017 RF, 2017 QX35, 2017 QN33, 2014 QL433, 2010 SA12, 85867, 23548, 20826, 163454, 162913, 154144, 136818
J43Oukaimeden Obs. in Morocco, 2 in MPEC 2017-R26 -- 2014 YC15, 3361
C27Pallerols Obs. in Spain, 1 in MPEC 2017-R26 -- 3122
F51Pan-STARRS 1 (PS1) in Hawaii, 8 in MPEC 2017-R26 -- 2017 QR35, 2017 QR, 374851, 253586, 23714, 162273, 6611, 1865
204Schiaparelli Obs. in Italy, 15 in MPEC 2017-R26 -- 2017 DF, 2017 DE, 2017 DC, 2017 DB, 2017 CS, 2017 CP32, 2017 BX6, 2017 BQ91, 2017 BJ92, 2017 AC5, 2016 CA138, 2008 CA6, 485652, 483508, 483422
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2017-R26 -- 2017 GP6
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2017-R26 -- 3122
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2017-R26 -- 3122
H32Texas A&M Physics Obs. in Texas, 1 in MPEC 2017-R26 -- 3122
718Wiggins Obs. in Utah, 1 in MPEC 2017-R26 -- 3122
N87Xinjiang Obs. Nanshan Station in China, 2 in MPEC 2017-R26 -- 2017 QV34, 2017 PV26
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 3 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 RCNEODyS15302066-2117614.37e-05-6.12-6.590NEODyS: "Based on 24 optical observations (of which 0 are rejected as outliers) from 2017-09-01.386 to 2017-09-02.383."
JPL Sentry01562086-2117244.7578301e-05-6.09-6.470JPL: Computed at 18:00 Sept. 2nd Pacific time based on 24 observations spanning .99683 days (2017-Sep-01.38514 to 2017-Sep-02.38197). Diameter approximately 0.009 km. from weighted mean H=27.95.
2015 RN35NEODyS15302074-2112122.81e-06-4.98-5.280NEODyS: "Based on 68 optical observations (of which 0 are rejected as outliers) from 2015-09-09.517 to 2016-03-15.442."
2008 EM68JPL Sentry01562017-211611161.35696028e-05-5.11-5.470JPL: 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 3 September '17

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

1712Generated Traffic Report
1702Grabbed MPEC 2017-R27 - 2017 QX35 - see above
Grabbed MPEC 2017-R28 - 2017 RF - see above
1530Noted that NEODyS has updated its 2015 RN35 risk assessment - see above
Noted that NEODyS has posted 2017 RC as an impact risk - see above
Grabbed MPEC 2017-R26 - Daily Orbit Update - see above
0156Noted that JPL Sentry has updated its 2008 EM68 risk assessment - see above
Noted that JPL Sentry has posted 2017 RC as an impact risk - see above