Contents on 7 September '17
- Traffic Report -- three objects
- IAU Minor Planet Center
- Observers -- seventeen observers
- Impact Risk Monitoring -- two objects
Asteroid/Comet Connection (A/CC) Resources:
- Consolidated Risk Tables - the CRT page
Of 798 risk-listed objects, 31 have had news in the last 31 days. Updated at 1544 UTC on 7 Sept.
- Ephemerides for risk-listed objects & close passers
- News archive (old) & news image catalog (discontinued)
- Object Links - mainly for radar targets & close passers (mostly discontinued)
- Observing Campaigns (old)
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 September '17
Three objects reported inside ten LD
Three minor objects are known to be within ten lunar distances (LD) of Earth today. Nearest is intruder 2017 QB35, heading out from 3.36 to 4.21 LD.
|Earth passage||I D||~Size||Distance Today||Notes|
|0.93 LD Sept. 3||2017 QB35||5 m||3.36 to 4.21 LD||intruder|
|3.78 LD yesterday||2017 RB||8 m||3.86 to 4.25 LD|
|4.36 LD Sept. 1||2017 QG18||12 m||8.99 to 10.29 LD||exits ten LD|
|Approaching (sorted by 10-LD bubble entry date)|
|7.87 LD Sept. 29||1989 VB||389 m||< 10 LD Sept. 25|
|0.13 LD Oct. 12||2012 TC4||15 m||< 10 LD Oct. 5, intruder, radar/NHATS target, risk|
|8.5 LD Oct. 13||2005 TE49||15 m||< 10 LD Oct. 11, uncertainty +/- 10.1167 hours, NHATS target|
|5.77 LD Oct. 22||171576 1999 VP11||645 m||< 10 LD Oct. 20|
This report was generated at 1548 UTC.
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 7 September '17
The MPC's NEO Confirmation Page has 35 listings
When last checked at 2342 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 35 objects listed. Of these, 22 were "one nighters." So far The Tracking News has counted a total of 61 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 September '17
Minor Planet Electronic Circulars
As of last check at 2342 UTC, there have been six MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.
- MPEC 2017-R36 time-stamped "00:55 UT" - 2017 RS - see below
- MPEC 2017-R37 time-stamped "00:58 UT" - 2017 RT - see below
- MPEC 2017-R38 time-stamped "01:01 UT" - 2017 RU - see below
- MPEC 2017-R39 time-stamped "01:04 UT" - 2017 QY35 - see below
- MPEC 2017-R40 time-stamped "01:07 UT" - 2017 RV - see below
- MPEC 2017-R41 time-stamped "12:03 UT" - Daily Orbit Update
- Observations of risk-listed objects
- K17R00L 2017 RL (arc=6 days, H=18.7 ~616m) from Northolt Branch Obs. (Sept. 6.03-04p4) and Spacewatch via Kitt Peak Natl. Obs. (KPNO) (Sept. 7.40p3)
- K17P26L 2017 PL26 (small asteroid, arc=68 days, H=22.2 ~123m) from Kourovskaya Obs. (Aug. 23.77p1, 23.82p2, 24.81p1, 24.89p1 & 24.93-94p2)
- Observations of recently (no longer) risk-listed objects
- K17O19P 2017 OP19 (Q=4.746 AU, arc=42 days, H=19.4 ~446m) from Spacewatch/KPNO (Sept. 7.19-20p2)
- Observations of other objects
- K17Q34Y 2017 QY34 (arc=7 days, H=20.9 ~224m) from Astronomical Research Obs. Westfield (Sept. 6.10-11p3)
- K17Q17S 2017 QS17 (arc=14 days, H=19.8 ~371m) from Pan-STARRS 1 (PS1) (Sept. 6.43-46p3)
- K15KC0N 2015 KN120 (arc=2 opp, H=20.4 ~282m) from PS1 (Sept. 4.37-40p3)
- K12D08P 2012 DP8 (arc=4 opp, H=19.8 ~371m) from Spacewatch/KPNO (Sept. 7.41-44p3)
- K10J41M 2010 JM41 (arc=3 opp, H=20.8 ~234m) from UH/Tholen NEO Follow-Up 2.24m Telescope (2011 May 24.32-34p3 at G=24.0-2)
- K10CE0P 2010 CP140 (arc=5 opp, H=19.5 ~426m) from Spacewatch/KPNO (Sept. 7.46-47p2)
- n5857 495857 2003 MT from PS1 (Sept. 4.37-39p3)
- j8368 458368 2010 WJ from PS1 (Sept. 6.31-34p4)
- a7525 367525 2009 QZ6 from PS1 (Sept. 6.42-46p4)
- N7805 237805 2002 CF26 from Northolt Branch Obs. (Sept. 6.00-02p10)
- F3415 153415 2001 QP153 from Northolt Branch Obs. (Sept. 5.94-95p3)
- 68348 68348 2001 LO7 from ATLAS Haleakala (Sept. 6.26-28p4)
- 03122 3122 Florence (1981 ET3) from Sergio Foglia via iTelescope Obs. Siding Spring (Sept. 2.55p3), Contern Obs. (Sept. 2.91-96p6), Foxfire Village Obs. (Sept. 4.08-09p2), Northolt Branch Obs. (Sept. 5.97-99p15), and Spirit Marsh Obs. (Sept. 7.08-10p6)
MPEC 2017-R40 - "01:07 UT" - 2017 RV
- K17R00V 2017 RV (borderline-small, Earth MOID=1.9 LD, H=21.8 ~148m) was picked up at 0947 UT on 2 Sept. by the Mt. Lemmon Survey (MLS), observing it at Sept. 2.41-45p8 and 3.44-45p4. This detection was confirmed by PS1 (Aug. 24.52-55p3), Magdalena Ridge Obs. (MRO) (Sept. 2.45-47p4), and ARO Westfield (Sept. 4.21-22p3).
MPEC 2017-R39 - "01:04 UT" - 2017 QY35
- K17Q35Y 2017 QY35 (Q=4.843 AU, H=18.2 ~776m) was picked up at 0302 UT on 29 Aug. by WISE, observing it at Aug. 29.13p1, 29.52p1, 29.65p2, 29.78p1, 30.44p1, 30.57p1, 30.70p2, 30.76p1, 30.89p1, 30.96p1, 31.03p1, 31.16p1, 31.22p1, 31.29p1, 31.35p1, 31.48p1, 31.55p1, 31.61p1, 31.94p1, Sept. 1.07p1, 1.20p1, 1.47p1, 1.60p1, and 1.86p1. This detection was confirmed by PS1 (Aug. 8.57-60p2) and the Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) (Sept. 3.48p2 & 5.42p3).
MPEC 2017-R38 - "01:01 UT" - 2017 RU
- K17R00U 2017 RU (small asteroid, Q=4.101 AU, H=22.3 ~117m) was picked up at 0856 UT on 2 Sept. by PS1, observing it at Sept. 2.37-41p4. This detection was confirmed by MRO (Sept. 2.48-49p4), ARO Westfield (Sept. 4.19-21p3 & 6.25-26p5), and Great Shefford Obs. (Sept. 5.87-91p4).
MPEC 2017-R37 - "00:58 UT" - 2017 RT
- K17R00T 2017 RT (Q=4.235 AU, H=19.3 ~467m) was picked up at 1216 UT on 1 Sept. by PS1, observing it at Sept. 1.51-54p3. This detection was confirmed by the Spacewatch 1.8m telescope (Sept. 2.36p3) and ARO Westfield (Sept. 4.36-37p3 & 6.33-35p3).
MPEC 2017-R36 - "00:55 UT" - 2017 RS
- K17R00S 2017 RS (q=1.592 AU, Q=6.692 AU, H=18.7 ~616m) was picked up at 0821 UT on 1 Sept. by PS1, observing it at Sept. 1.35-39p4. This detection was confirmed by Spacewatch 1.8m (Sept. 2.46-47p2), Spacewatch/KPNO (Sept. 5.35-37p9), and ARO Westfield (Sept. 6.21-22p3).
Observers on 7 September '17
Seventeen observers appear in today's MPECs.
|Code||Observer / observatory|
|H21||Astronomical Research Obs. Westfield in Illinois, 5 in MPECs 2017-R36, 2017-R37, 2017-R38, 2017-R40 & 2017-R41 -- 2017 RV, 2017 RU, 2017 RT, 2017 RS, 2017 QY34|
|T05||ATLAS Haleakala in Hawaii, 1 in MPEC 2017-R41 -- 68348|
|V06||Catalina Sky Survey Kuiper Telescope in Arizona, 1 in MPEC 2017-R39 -- 2017 QY35|
|K26||Contern Obs. in Luxembourg, 1 in MPEC 2017-R41 -- 3122|
|W46||Foxfire Village Obs., 1 in MPEC 2017-R41 -- 3122|
|J95||Great Shefford Obs. in England, 1 in MPEC 2017-R38 -- 2017 RU|
|Q62|||Sergio Foglia in Italy via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-R41 -- 3122|
|695^||Spacewatch via Kitt Peak Natl. Obs. (KPNO) in Arizona, 5 in MPECs 2017-R36 & 2017-R41 -- 2017 RS, 2017 RL, 2017 OP19, 2012 DP8, 2010 CP140|
|168||Kourovskaya Obs. in Russia, 1 in MPEC 2017-R41 -- 2017 PL26|
|H01||Magdalena Ridge Obs. (MRO) in New Mexico, 2 in MPECs 2017-R38 & 2017-R40 -- 2017 RV, 2017 RU|
|G96||Mt. Lemmon Survey in Arizona, 1 in MPEC 2017-R40 -- 2017 RV|
|Z80||Northolt Branch Obs. in England, 4 in MPEC 2017-R41 -- 2017 RL, 237805, 153415, 3122|
|F51||Pan-STARRS 1 (PS1) in Hawaii, 10 in MPECs 2017-R36, 2017-R37, 2017-R38, 2017-R39, 2017-R40 & 2017-R41 -- 2017 RV, 2017 RU, 2017 RT, 2017 RS, 2017 QY35, 2017 QS17, 2015 KN120, 495857, 458368, 367525|
|291||Spacewatch 1.8m telescope in Arizona, 2 in MPECs 2017-R36 & 2017-R37 -- 2017 RT, 2017 RS|
|V78||Spirit Marsh Obs. in Minnesota, 1 in MPEC 2017-R41 -- 3122|
|T12||UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-R41 -- 2010 JM41|
|C51||WISE in Earth polar orbit, 1 in MPEC 2017-R39 -- 2017 QY35|
|For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.|
Impact Risk Monitoring on 7 September '17
Notes for Today's Latest Risk Assessments
|2017 RL||JPL Sentry||1542||2072-2072||1||5.942e-07||-3.03||-3.03||0||JPL: Computed at 07:48 today Pacific time based on 55 observations spanning 5.8397 days (2017-Sep-01.5615 to 2017-Sep-07.4012). Diameter approximately 0.700 km. from weighted mean H=18.41.|
|NEODyS||1542||2072||1||1.49e-08||-4.63||-4.63||0||NEODyS: "Based on 55 optical observations (of which 1 are rejected as outliers) from 2017-09-01.562 to 2017-09-07.402."|
|2017 PL26||JPL Sentry||1542||2087-2116||17||4.061895e-06||-4.35||-4.65||0||JPL: Computed at 07:57 today Pacific time based on 202 observations spanning 68.296 days (2017-Jun-21.52716 to 2017-Aug-28.82329). Diameter approximately 0.130 km. from weighted mean H=22.13.|
|NEODyS||1542||2081-2116||32||3.65e-06||-4.38||-4.57||0||NEODyS: "Based on 205 optical observations (of which 9 are rejected as outliers) from 2017-06-21.528 to 2017-08-28.824."|
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 September '17
Times are UTC for when items were noted or added by The Tracking News.
|1548||Generated Traffic Report|
|1542||Noted that JPL Sentry has updated its 2017 PL26 risk assessment - see above|
Noted that NEODyS has updated its 2017 PL26 risk assessment - see above
Noted that JPL Sentry has updated its 2017 RL risk assessment - see above
Noted that NEODyS has updated its 2017 RL risk assessment - see above
Grabbed MPEC 2017-R41 - Daily Orbit Update - see above
|0417||Grabbed MPEC 2017-R36 - 2017 RS - see above|
Grabbed MPEC 2017-R37 - 2017 RT - see above
Grabbed MPEC 2017-R38 - 2017 RU - see above
Grabbed MPEC 2017-R39 - 2017 QY35 - see above
Grabbed MPEC 2017-R40 - 2017 RV - see above