Contents on 28 April '18
- Traffic Report -- one object
- IAU Minor Planet Center
- Observers -- eleven observers
- Impact Risk Monitoring -- one object
Asteroid/Comet Connection (A/CC) Resources:
- Consolidated Risk Tables - the CRT page
Of 941 risk-listed objects, 43 have had news in the last 31 days. Updated at 2231 UTC on 28 April.
- 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 28 April '18
One object reported inside ten LD
One planetesimal is reported within ten lunar distances (LD) of Earth today. Risk-listed intruder 2018 HW1 is outbound from from 6.56 to 7.62 LD.
|Earth passage||I D||~Size||Distance today||Inside ten LD||Notes|
|0.89 LD April 21||2018 HW1||22 m||6.56 to 7.62 LD||April 12 - May 1||intruder, NHATS target, risk|
|Approaching (sorted by 10-LD bubble entry date)|
|6.2 LD May 8*||2016 JQ5||8 m||22.6 from 24.9 LD||May 4 - 11||EPU +/- 14.00 hours*|
|9.65 LD May 7||1999 FN19||112 m||14.54 from 15.50 LD||May 5 - 9||radar/NHATS target|
|6.48 LD May 9||388945 2008 TZ3||282 m||22.33 from 24.33 LD||May 5 - 13|
|9.50 LD May 29||68347 2001 KB67||371 m||96.13 from 99.70 LD||May 28 - 30||radar target|
|5.56 LD June 10||2018 EJ4||186 m||57.28 from 58.52 LD||June 4 - 16||radar/NHATS target|
|8.96 LD June 11||2015 DP155||162 m||39.69 from 40.41 LD||June 6 - 15||NHATS target|
|* EPU = Earth passage uncertainty|
This report was generated at 1820 UTC with follow-up in today's DOU MPEC for departed 2018 HL1.
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 temporal 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 28 April '18
The MPC's NEO Confirmation Page has 17 listings
When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had seventeen objects listed. Of these, six 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 28 April '18
Minor Planet Electronic Circulars
As of last check at 2358 UTC, there have been two MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.
- MPEC 2018-H98 time-stamped "12:04 UT" - Daily Orbit Update - see below
- MPEC 2018-H99 time-stamped "21:31 UT" - 2007 CM26 = 2018 EY2
MPEC 2018-H99 - "21:31 UT" - 2007 CM26 = 2018 EY2
- K18E02Y 2018 EY2 (risk listed, NHATS target)
- K07C26M 2007 CM26 (H=25.1 ~32m, NHATS) from Pan-STARRS 1 (PS1) (Feb. 12.52-55p3 at G=21.8-22.1)
Id. R. Weryk
- Observations of close-passing objects
- K18H01L 2018 HL1 (arc=6 days, H=23.9 ~56m) from Wobblesock Obs. (April 27.52-54p3)
- Observation campaigns (NHATS targets, radar support)
- K13U03S 2013 US3 (arc=2 opp, H=21.3 ~186m, NHATS) from Landehen Obs. (April 25.91-92p2) and Fabra Obs. (April 26.83-84p8)
-- NHATS target table
- Observations of other objects
- K18F05Q 2018 FQ5 (arc=30 days, H=18.5 ~676m) from M. Kumrucu-Lohmiller via Slooh.com Chile Obs. (April 27.27-30p6)
- K18F04N 2018 FN4 (Q=4.324 AU, arc=38 days, H=19.6 ~407m) from Wobblesock Obs. (April 27.47-48p3)
- K17W14H 2017 WH14 (arc=155 days, H=18.1 ~812m) from SATINO-1 (April 25.83p1, 25.89p1, 25.97p1, 26.03-06p2 & 26.13p1)
- K16J00P 2016 JP (arc=3 opp, H=21.1 ~204m) from Landehen Obs. (April 25.92-93p3)
- K14J31C 2014 JC31 (i=36.9°, Q=4.095 AU, arc=2 opp, H=19.0 ~537m) from the Mt. Lemmon Survey (MLS) (April 27.44-46p4)
- k3664 463664 2014 JY24 from WISE (April 26.14p1, 26.27p1, 26.34p1, 26.40p1 & 26.53p1)
- i4193 444193 2005 SE71 from Fabra Obs. (April 26.81p8)
- S8807 288807 2004 RW164 from WISE (April 24.51p1, 24.65p1, 24.71p1, 24.78p1, 24.91p1, 25.04p1, 25.17p1, 25.23p1, 25.36p1, 25.43p1, 25.56p1, 25.63p1, 26.02p1, 26.08p1, 26.15p1, 26.22p1, 26.41p2, 26.48p1, 26.80p1, 26.87p1, 26.94p1, 27.07p1 & 27.33p1)
- L2359 212359 2006 EV52 from JAXA Space Tracking & Communications Center (JAXA STCC) (April 27.59p4)
- J4126 194126 2001 SG276 from Landehen Obs. (April 21.88-93p6)
- I4990 184990 2006 KE89 from the Catalina Sky Survey (CSS) (April 27.45-46p4)
- F2637 152637 1997 NC1 from CSS (April 27.45-46p4)
- D8847 138847 2000 VE62 from PMPHR Obs. (April 27.80-85p3)
- 24761 24761 Ahau (1993 BW2) from MLS (April 27.44-46p4)
- 15745 15745 Yuliya (1991 PM5) from MLS (April 27.47-48p4)
- 01627 1627 Ivar (1929 SH) from CSS (April 27.39-41p4)
Observers on 28 April '18
Eleven observers appear in today's MPECs.
|Code||Observer / observatory|
|703||Catalina Sky Survey (CSS) in Arizona, 3 in MPEC 2018-H98 -- 184990, 152637, 1627|
|006||Fabra Obs. in Spain, 2 in MPEC 2018-H98 -- 2013 US3, 444193|
|P93||JAXA Space Tracking & Communications Center in Japan, 1 in MPEC 2018-H98 -- 212359|
|Z43||Landehen Obs., 3 in MPEC 2018-H98 -- 2016 JP, 2013 US3, 194126|
|G96||Mt. Lemmon Survey (MLS) in Arizona, 3 in MPEC 2018-H98 -- 2014 JC31, 24761, 15745|
|F51||Pan-STARRS 1 in Hawaii, 1 in MPEC 2018-H99 -- 2007 CM26|
|K81||PMPHR Obs., 1 in MPEC 2018-H98 -- 138847|
|C95||SATINO-1 in France, 1 in MPEC 2018-H98 -- 2017 WH14|
|W885||M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Chile Obs. in Chile, 1 in MPEC 2018-H98 -- 2018 FQ5|
|C51||WISE in Earth polar orbit, 2 in MPEC 2018-H98 -- 463664, 288807|
|E08||Wobblesock Obs. in New South Wales, 2 in MPEC 2018-H98 -- 2018 HL1, 2018 FN4|
|For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.|
Impact Risk Monitoring on 28 April '18
Notes for Today's Latest Risk Assessments
|2018 EY2||JPL Sentry||2230||R E M O V E D||JPL: Risk listing removed at 1206 UTC March 13th|
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 28 April '18
Times are UTC for when items were noted or added by The Tracking News.
|2230||Noted that JPL Sentry has removed 2018 EY2 as an impact risk - see above|
|2139||Grabbed MPEC 2018-H99 - 2007 CM26 = 2018 EY2 - see above|
|1820||Generated Traffic Report|
|1630||Grabbed MPEC 2018-H98 - Daily Orbit Update - see above|