Contents on 2 May '18
- Traffic Report -- one object
- IAU Minor Planet Center
- Observers -- three observers
- Impact Risk Monitoring -- four objects
Asteroid/Comet Connection (A/CC) Resources:
- Consolidated Risk Tables - the CRT page
Of 942 risk-listed objects, 44 have had news in the last 31 days. Updated at 1835 UTC on 2 May.
- 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 2 May '18
One object reported inside ten LD
One asteroid is reported to be within ten lunar distances (LD) of Earth today. 2018 HM2 is outbound from 8.91 to 9.33 LD.
|Earth passage||I D||~Size||Distance today||Inside ten LD||Notes|
|8.72 LD April 30||2018 HM2||62 m||8.91 to 9.33 LD||April 27 - May 4||NHATS target|
|Approaching (sorted by 10-LD bubble entry date)|
|6.2 LD May 8*||2016 JQ5||8 m||13.7 from 15.8 LD||May 4 - 11||EPU +/- 14.00 hours*|
|9.65 LD May 7||1999 FN19||112 m||11.27 from 11.98 LD||May 5 - 9||radar/NHATS target - DOU|
|6.48 LD May 9||388945 2008 TZ3||282 m||14.61 from 16.48 LD||May 5 - 13|
|9.50 LD May 29||68347 2001 KB67||371 m||82.27 from 85.68 LD||May 28 - 30||radar target|
|5.56 LD June 10||2018 EJ4||186 m||52.29 from 53.55 LD||June 4 - 16||radar/NHATS target|
|8.96 LD June 11||2015 DP155||162 m||36.72 from 37.47 LD||June 6 - 15||NHATS target|
|* EPU = Earth passage uncertainty|
This report was generated at 1942 UTC with follow-up in today's DOU MPEC for departed risk-listed intruder 2018 HW1 and for approaching 1999 FN19.
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 2 May '18
The MPC's NEO Confirmation Page has 6 listings
When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had six objects listed. Of these, three were "one nighters." So far The Tracking News has counted a total of seven 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 2 May '18
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.
- Observations of risk-listed objects
- K18H01W 2018 HW1 (small asteroid, arc=5 days, H=25.8 ~23m, close passer, NHATS target) from Wobblesock Obs. (April 27.49-51p3 & 28.47-49p3)
- Observations of close-passing objects
- J99F19N 1999 FN19 (arc=2 opp, H=22.5 ~107m, NHATS target, radar support) from Castelmartini Obs. (April 26.88p2)
- Observations of other objects
- K18B02Y 2018 BY2 (arc=117 days, H=20.5 ~269m) from Castelmartini Obs. (April 26.94p3)
- K06SJ8P 2006 SP198 (Q=4.626 AU, arc=4 opp, H=21.5 ~170m) from NEAT's Mt. Palomar telescope (2001 Oct. 29.38-40p2)
- l5967 475967 2007 JF22 from Castelmartini Obs. (April 26.92p3)
- b4851 374851 2006 VV2 from Castelmartini Obs. (April 26.81-82p3)
- X7084 337084 1998 SE36 from Castelmartini Obs. (April 26.92-93p3)
- G3243 163243 2002 FB3 from Castelmartini Obs. (April 26.82-83p3)
- 09856 9856 1991 EE from Castelmartini Obs. (April 26.91p3)
- 08037 8037 1993 HO1 from Castelmartini Obs. (April 26.83p2)
Observers on 2 May '18
Three observers appear in today's MPEC.
|Code||Observer / observatory|
|160||Castelmartini Obs. in Italy, 8 in MPEC 2018-J02 -- 2018 BY2, 1999 FN19, 475967, 374851, 337084, 163243, 9856, 8037|
|644||NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2018-J02 -- 2006 SP198|
|E08||Wobblesock Obs. in New South Wales, 1 in MPEC 2018-J02 -- 2018 HW1|
|For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.|
Impact Risk Monitoring on 2 May '18
Notes for Today's Latest Risk Assessments
|2018 HJ2||NEODyS||0618||2085||1||2.23e-05||-4.45||-4.45||0||NEODyS: "Based on 52 optical observations (of which 0 are rejected as outliers) from 2018-04-23.412 to 2018-04-29.292."|
|2018 HW1||JPL Sentry||1834||2118-2118||3||3.5157e-07||-7.33||-7.65||0||JPL: Computed at 07:41 today Pacific time based on 50 observations spanning 5.2795 days (2018-Apr-23.20248 to 2018-Apr-28.48196). Diameter approximately 0.024 km. from weighted mean H=25.77.|
|NEODyS||1834||2105-2118||5||8.71e-08||-7.93||-8.21||n/a||NEODyS: "Based on 51 optical observations (of which 1 are rejected as outliers) from 2018-04-23.203 to 2018-04-28.491."|
|2018 EZ2||NEODyS||0618||2055-2118||21||3.92e-05||-5.13||-5.17||-||NEODyS: "Based on 88 optical observations (of which 0 are rejected as outliers) from 2018-03-12.422 to 2018-04-18.382."|
|2014 HD198||NEODyS||0618||2025-2112||14||8.18e-07||-7.91||-8.29||0||NEODyS: "Based on 6 optical observations (of which 0 are rejected as outliers) from 2014-04-25.134 to 2014-04-26.100."|
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 2 May '18
Times are UTC for when items were noted or added by The Tracking News.
|1942||Generated Traffic Report|
|1834||Noted that JPL Sentry has updated its 2018 HW1 risk assessment - see above|
Noted that NEODyS has updated its 2018 HW1 risk assessment - see above
Grabbed MPEC 2018-J02 - Daily Orbit Update - see above
|0618||Noted that NEODyS has updated its 2014 HD198 risk assessment - see above|
Noted that NEODyS has updated its 2018 EZ2 risk assessment - see above
Noted that NEODyS has updated its 2018 HJ2 risk assessment - see above