Contents on 3 January '18
- Traffic Report -- three objects
- IAU Minor Planet Center
- Observers -- twelve observers
- Impact Risk Monitoring -- one object
Asteroid/Comet Connection (A/CC) Resources:
- Consolidated Risk Tables - the CRT page
Of 904 risk-listed objects, 52 have had news in the last 31 days. Updated at 1645 UTC on 3 Jan.
- 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 3 January '18
Three objects reported inside ten LD
Three minor objects are known to be traveling less than ten lunar distances (LD) from Earth today. Nearest is 2017 YD7, which comes its closest to our world this time around, reaching 4.73 LD at 0039 UTC.
|Earth passage||I D||~Size||Distance today||Inside ten LD||Notes|
|1.93 LD Dec. 24||2017 YS1||6 m||7.07 to 7.76 LD||Dec. 11 - Jan. 7||NHATS target|
|4.73 LD today||2017 YD7||12 m||4.73 LD||Dec. 30 - Jan. 6||NHATS target, Earth closest at 0039 UTC|
|7.74 LD Dec. 30||2017 YU1||20 m||9.98 to 11.14 LD||Dec. 26 - today||NHATS target, exits ten LD|
|Approaching (sorted by 10-LD bubble entry date)|
|3.7 LD Feb. 24*||2017 DR109||10 m||104.5 from 107.3 LD||Feb. 18 - March 1||EPU +/- 30 mins.*, NHATS target|
|3.76 LD March 7||2017 VR12||272 m||84.25 from 85.71 LD||Feb. 28 - March 13||radar/NHATS target|
|* EPU = Earth passage uncertainty|
This report was generated at 1652 UTC.
Reading: Quartz has a nifty little article today, "How far is the Earth from the moon? Take a look yourself." As the author shows, the perspective of the photo from OSIRIS-REx makes the Earth and Moon look about a third closer than they actually are, but clearly there's plenty of empty space out there for small rocks to quietly pass by or between. See this for more about the picture.
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 3 January '18
The MPC's NEO Confirmation Page has 39 listings
When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 39 objects listed. Of these, twelve 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 3 January '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.
- Observation campaigns (NHATS targets, radar support)
- K17W12X 2017 WX12 (arc=40 days, H=22.1 ~129m, radar) from Castelmartini Obs. (Dec. 19.00-01p3)
-- Planetary radar schedules: Arecibo & Goldstone
- Observations of other objects
- K17U07R 2017 UR7 (Q=5.320 AU, arc=133 days, H=19.6 ~407m) from WISE (Dec. 29.39p1, 29.45p1, 29.52p1, 29.58p1, 29.78p1, 29.84p1, 29.91p1, 30.04p1, 30.17p1, 30.69p1, 30.83p1, 30.96p1, 31.09p1, 31.22p1, 31.35p1, 31.48p1, 31.74p1, 31.87p1, Jan. 1.00p1, 1.13p1, 1.27p1, 1.40p1, 1.66p1, 1.79p1, 2.05p1, 2.18p1 & 2.31p1)
- K15Y18D 2015 YD18 (i=40.8°, arc=2 opp, H=20.8 ~234m) from ESA Optical Ground Station (ESA OGS) (Dec. 19.20p3)
- K09Q08L 2009 QL8 (arc=5 opp, H=19.5 ~426m) from ATLAS Mauna Loa (Jan. 2.62-65p8)
- K04C01L 2004 CL1 (arc=3 opp, H=19.3 ~467m) from WISE (Dec. 30.66p1, 30.79p2, 30.92p1, 31.05p1, 31.18p1, 31.31p1, 31.44p1, 31.71p1, 31.77p1, 31.84p2, 31.90p2, 31.97p1, Jan. 1.10p1, 1.16p1, 1.23p1, 1.29p1, 1.36p1, 1.43p1, 1.49p1, 1.56p1, 1.62p1, 1.69p1, 1.75p1, 1.82p1, 2.08p1 & 2.21p1)
- J99A04F 1999 AF4 (Q=4.570 AU, arc=2 opp, H=18.5 ~676m) from Bucharest Obs. (Dec. 27.71p1, 27.75p1, 27.87p1 & 27.92p1)
- o7366 507366 2011 XO3 from ATLAS Haleakala (Jan. 2.53-55p4)
- o4887 504887 2010 WL from Castelmartini Obs. (Dec. 18.98-99p3)
- n6818 496818 1993 RA from ATLAS Mauna Loa (Jan. 2.38-40p4)
- l5967 475967 2007 JF22 from ATLAS Haleakala (Jan. 2.53-56p4)
- h8430 438430 2006 WL3 from Castelmartini Obs. (Dec. 18.99-00p3)
- f5029 415029 2011 UL21 from ATLAS Mauna Loa (Jan. 2.43-46p3)
- a1071 361071 2006 AO4 from Squirrel Valley Obs. (Jan. 2.99-03p3)
- X7228 337228 2000 FL1 from ATLAS Haleakala (Jan. 2.64-66p4)
- X3888 333888 1998 ST4 from MASTER IAC Obs. (Jan. 1.93-94p4 & 2.04p1) and ATLAS Mauna Loa (Jan. 2.32-35p4)
- W2763 322763 2001 FA7 from WISE (Dec. 29.55p1, 29.61p1, 29.68p1, 29.74p1, 29.87p1 & 30.14p1)
- U2311 302311 2002 AA from ATLAS Haleakala (Jan. 2.45-48p4)
- S1365 281365 2008 CM116 from ATLAS Haleakala (Jan. 2.56-60p8)
- G3696 163696 2003 EB50 from ATLAS Haleakala (Jan. 2.37-41p7)
- G2011 162011 Konnohmaru (1994 AB1) from ATLAS Mauna Loa (Jan. 2.50-53p4)
- E3992 143992 2004 AF from ATLAS Haleakala (Jan. 2.49-52p4)
- 96590 96590 1998 XB from ATLAS Haleakala (Jan. 2.55-57p4)
- 96189 96189 Pygmalion (1991 NT3) from WISE (Dec. 29.55p1, 29.62p1, 29.68p1, 29.75p1, 29.81p1, 29.88p1, 29.94p1, 30.14p1, 30.53p1, 30.66p1, 30.80p1 & 30.93p1) and Pan-STARRS 1 (PS1) (Jan. 2.60-63p4)
- 66251 66251 1999 GJ2 from PS1 (Jan. 2.60-64p4)
- 53110 53110 1999 AR7 from ATLAS Mauna Loa (Jan. 2.36-38p4)
- 36284 36284 2000 DM8 from ATLAS Haleakala (Jan. 2.49-51p4)
- 17511 17511 1992 QN from ATLAS Haleakala (Jan. 2.31-34p4)
- 06053 6053 1993 BW3 from ATLAS Haleakala (Jan. 2.49-51p4)
- 03122 3122 Florence (1981 ET3) from Northolt Branch Obs. (Jan. 1.97-99p6), ISON New Mexico Obs. (Jan. 2.18-19p3), and Spirit Marsh Obs. (Jan. 3.16-18p3)
- 01980 1980 Tezcatlipoca (1950 LA) from ATLAS Mauna Loa (Jan. 2.20-22p4)
- 01864 1864 Daedalus (1971 FA) from ATLAS Haleakala (Jan. 2.50-53p4)
- 01627 1627 Ivar (1929 SH) from ATLAS Mauna Loa (Jan. 2.61-65p8)
- 01036 1036 Ganymed (1924 TD) from PS1 (Jan. 2.56-59p4)
Observers on 3 January '18
Twelve observers appear in today's MPEC.
|Code||Observer / observatory|
|T05||ATLAS Haleakala in Hawaii, 12 in MPEC 2018-A12 -- 96590, 507366, 475967, 36284, 337228, 302311, 281365, 17511, 163696, 143992, 6053, 1864|
|T08||ATLAS Mauna Loa in Hawaii, 8 in MPEC 2018-A12 -- 2009 QL8, 53110, 496818, 415029, 333888, 162011, 1980, 1627|
|073||Bucharest Obs. in Romania, 1 in MPEC 2018-A12 -- 1999 AF4|
|160||Castelmartini Obs. in Italy, 3 in MPEC 2018-A12 -- 2017 WX12, 504887, 438430|
|J04||ESA Optical Ground Station in the Canary Islands, 1 in MPEC 2018-A12 -- 2015 YD18|
|H15||ISON New Mexico Obs. in New Mexico, 1 in MPEC 2018-A12 -- 3122|
|Z22||MASTER IAC Obs. in the Canary Islands, 1 in MPEC 2018-A12 -- 333888|
|Z80||Northolt Branch Obs. in England, 1 in MPEC 2018-A12 -- 3122|
|F51||Pan-STARRS 1 (PS1) in Hawaii, 3 in MPEC 2018-A12 -- 96189, 66251, 1036|
|V78||Spirit Marsh Obs. in Minnesota, 1 in MPEC 2018-A12 -- 3122|
|W34||Squirrel Valley Obs. in North Carolina, 1 in MPEC 2018-A12 -- 361071|
|C51||WISE in Earth polar orbit, 4 in MPEC 2018-A12 -- 2017 UR7, 2004 CL1, 96189, 322763|
|For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.|
Impact Risk Monitoring on 3 January '18
Notes for Today's Latest Risk Assessments
|2017 YE8||NEODyS||0734||2110-2113||3||6.68e-08||-7.67||-8.14||0||NEODyS: "Based on 20 optical observations (of which 4 are rejected as outliers) from 2017-12-29.286 to 2017-12-31.435."|
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.