Contents on 18 December '18
- Traffic Report -- twelve objects
- IAU Minor Planet Center
- Observers -- thirteen observers
- Impact Risk Monitoring -- four objects
Asteroid/Comet Connection (A/CC) Resources:
- Consolidated Risk Tables - the CRT page
Of 1004 risk-listed objects, 39 have had news in the last 31 days. Updated at 2204 UTC on 18 Dec.
- 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 18 December '18
Twelve objects reported inside ten LD
There are twelve minor objects reported within ten lunar distances (LD) of Earth today. Nearest is risk-listed 2018 VO9, which heads away from 3.07 to 3.44 LD.
|Neighborhood Traffic - sorted by Earth passage distance, grouped by 1.0, 2.41, 5.0 & 10.0 LD boundaries|
|Earth passage||I D||~Size||Distance today||Inside ten LD||Notes|
|0.09 LD Dec. 2||2018 WV1||3 m||6.87 to 7.28 LD||Nov. 8 - Dec. 25||intruder, NHATS target|
|1.25 LD Dec. 10||2018 XX3||4 m||7.44 to 8.45 LD||Nov. 30 - Dec. 20||NHATS target, risk|
|1.6 LD Dec. 21*||2018 XC4||19 m||4.9 from 6.5 LD||Dec. 15 - 27||EPU +/- 6 mins.*, NHATS target|
|2.42 LD Dec. 12||2018 XL1||14 m||8.27 to 9.58 LD||Dec. 5 - 19||NHATS target|
|2.62 LD Dec. 15||2018 VO9||14 m||3.07 to 3.44 LD||Nov. 29 - Dec. 31||NHATS target, risk|
|2.72 LD Dec. 15||2018 XG4||11 m||5.80 to 7.39 LD||Dec. 9 - 20|
|2.76 LD Dec. 16||2018 XS4||30 m||4.25 to 5.85 LD||Dec. 11 - 21|
|3.0 LD Dec. 24*||2018 XN5||25 m||8.7 from 10.1 LD||today - Dec. 31||EPU +/- 52 mins.*, NHATS target, enters ten LD, risk|
|3.92 LD Dec. 2||2018 TG6||12 m||5.80 to 6.01 LD||Oct. 30 - Jan. 5||NHATS target|
|5.32 LD yesterday||2018 XR4||15 m||5.32 to 5.96 LD||Dec. 14 - 21||risk|
|5.58 LD Dec. 13||2018 XJ1||18 m||8.74 to 9.87 LD||Dec. 7 - 19|
|7.36 LD Dec. 22||163899 2003 SD220||1.17 km||8.50 from 9.28 LD||yesterday - Dec. 26||radar/NHATS target|
|* EPU = Earth passage uncertainty|
This report was generated at 2042 UTC with follow-up in today's DOU MPEC for departed 2018 XB5.
|Approaching - sorted by 10-LD bubble entry date|
|Earth passage||I D||~Size||Distance today||Inside ten LD||Notes|
|5.3 LD Dec. 26*||2018 XE4||17 m||17.4 from 19.4 LD||Dec. 22 - 30||EPU +/- 3.33 hours*|
|7.8 LD Jan. 6*||2018 XO4||29 m||18.2 from 18.9 LD||Dec. 30 - Jan. 13||EPU +/- 3.18 hours*, NHATS target|
|7.3 LD Jan. 9*||2013 YM2||19 m||22.1 from 23.0 LD||Jan. 2 - 16||EPU +/- 3.75 days*, NHATS target|
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. "LD*" indicates some uncertainty in object passage time and distance. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.
NEOCP Activity on 18 December '18
The MPC's NEO Confirmation Page has 67 listings
When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 67 objects listed. Of these, 27 were "one nighters." So far The Tracking News has counted a total of 76 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 18 December '18
Minor Planet Electronic Circulars
As of last check at 2358 UTC, there have been seven MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.
- MPEC 2018-Y25 time-stamped "13:04 UT" - Daily Orbit Update - see below
- MPEC 2018-Y26 time-stamped "20:14 UT" - 2018 XV5 - see below
- MPEC 2018-Y27 time-stamped "20:18 UT" - 2018 XW5 - see below
- MPEC 2018-Y28 time-stamped "20:21 UT" - 2018 XX5 - see below
- MPEC 2018-Y29 time-stamped "20:25 UT" - 2018 XY5 - see below
- MPEC 2018-Y30 time-stamped "20:28 UT" - 2018 YA - see below
- MPEC 2018-Y31 time-stamped "20:32 UT" - 2018 YB
MPEC 2018-Y31 - "20:32 UT" - 2018 YB
- K18Y00B 2018 YB (small asteroid, Earth MOID=8.7 LD, H=23.7 ~62m) was picked up at 1147 UT on 16 Dec. by Pan-STARRS 1 (PS1), observing it at Dec. 16.49-52p3. This detection was confirmed by Sandlot Obs. (Dec. 17.31-36p3), R. Wainscoat on Mauna Kea (Dec. 17.52p3), and Visnjan Obs. (Dec. 17.97-98p3).
MPEC 2018-Y30 - "20:28 UT" - 2018 YA
- K18Y00A 2018 YA (small asteroid, H=24.3 ~47m) was picked up at 1142 UT on 16 Dec. by PS1, observing it at Dec. 16.49-51p3 at w=21.8-22.4. This detection was confirmed by R. Wainscoat/Mauna Kea (Dec. 17.51-52p3) and Astronomical Research Obs. Westfield (Dec. 18.34-35p3 at V=21.9-22.1).
MPEC 2018-Y29 - "20:25 UT" - 2018 XY5
- K18X05Y 2018 XY5 (small asteroid, H=25.6 ~26m) was picked up at 1054 UT on 15 Dec. by PS1, observing it at Dec. 15.45-49p3. This detection was confirmed by Visnjan Obs. (Dec. 15.84p4), R. Wainscoat/Mauna Kea (Dec. 16.33-34p3), and ARO Westfield (Dec. 17.11-13p3).
MPEC 2018-Y28 - "20:21 UT" - 2018 XX5
- K18X05X 2018 XX5 (H=20.8 ~234m) was picked up at 0828 UT on 15 Dec. by PS1, observing it at Dec. 15.35-39p3. This detection was confirmed by R. Wainscoat/Mauna Kea (Dec. 16.25p3), ARO Westfield (Dec. 17.14-16p3 & 18.05-06p3), and Visnjan Obs. (Dec. 17.83p3).
MPEC 2018-Y27 - "20:18 UT" - 2018 XW5
- K18X05W 2018 XW5 (risk listed, H=19.6 ~407m) was picked up at 1328 UT on 14 Dec. by PS1, observing it at Dec. 14.56-60p3 at w=21.9-22.2. This detection was confirmed by Visnjan Obs. (Dec. 16.12-13p3), the Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) (Dec. 16.39-41p3), and ARO Westfield (Dec. 17.31-34p3 at V=21.7-22.2).
MPEC 2018-Y26 - "20:14 UT" - 2018 XV5
- K18X05V 2018 XV5 (risk listed, Q=4.113 AU, Earth MOID=8.2 LD, H=17.8 ~933m) was picked up at 0741 UT on 14 Dec. by the Mt. Lemmon Survey (MLS), observing it at Dec. 14.32-33p3. This detection was confirmed by Magdalena Ridge Obs. (MRO) (Dec. 14.43-46p4), Steward Obs. Mt. Lemmon Station (Dec. 15.22-23p4 & 16.36-38p3), Farpoint Obs. (Dec. 15.23-26p3), ARO Westfield (Dec. 17.21-23p3), and Visnjan Obs. (Dec. 17.88p3).
- Observations of close-passing objects
- K18X05B 2018 XB5 (arc=3 days, H=24.3 ~47m) from ATLAS Haleakala (Dec. 17.46-49p4)
- Observations of small asteroids (H>22.0)
- K18K03C 2018 KC3 (arc=2 opp, H=23.1 ~81m) from PS1 (Dec. 17.58-60p3)
- Observations of other objects
- K18X05K 2018 XK5 (arc=4 days, H=20.6 ~257m) from ATLAS Haleakala (Dec. 17.47-60p15)
- K18X03S 2018 XS3 (q=1.622 AU, arc=7 days, H=17.7 ~977m) from PS1 (Dec. 17.57-60p3)
- K18W01C 2018 WC1 (arc=28 days, H=21.6 ~162m) from PS1 (Dec. 17.52-56p4)
- K18V09B 2018 VB9 (Q=4.083 AU, arc=52 days, H=19.5 ~426m) from ATLAS Haleakala (Dec. 17.48-50p4)
- K10F80Y 2010 FY80 (Q=4.345 AU, arc=3 opp, H=19.7 ~389m) from PS1 (Dec. 17.63-65p3 at w=22.2-8)
- K05U01F 2005 UF1 (arc=3 opp, H=20.4 ~282m) from PS1 (Dec. 17.52-56p4)
- U2169 302169 2001 TD45 from UH/Tholen NEO Follow-Up 2.24m Telescope (Nov. 9.20p2)
- 17274 17274 2000 LC16 from WISE (Dec. 12.08p2, 12.14p2, 12.27p1, 12.54p2 & 12.67p1)
- 04596 4596 1981 QB from WISE (Dec. 12.12p1, 12.18p1, 12.25p1, 12.51p2 & 12.77p1)
Observers on 18 December '18
Thirteen observers appear in today's MPECs.
|Code||Observer / observatory|
|H21||Astronomical Research Obs. Westfield in Illinois, 5 in MPECs 2018-Y26, 2018-Y27, 2018-Y28, 2018-Y29 & 2018-Y30 -- 2018 YA, 2018 XY5, 2018 XX5, 2018 XW5, 2018 XV5|
|T05||ATLAS Haleakala in Hawaii, 3 in MPEC 2018-Y25 -- 2018 XK5, 2018 XB5, 2018 VB9|
|V06||Catalina Sky Survey Kuiper Telescope in Arizona, 1 in MPEC 2018-Y27 -- 2018 XW5|
|734||Farpoint Obs. in Kansas, 1 in MPEC 2018-Y26 -- 2018 XV5|
|H01||Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2018-Y26 -- 2018 XV5|
|568^||R. Wainscoat on Mauna Kea in Hawaii, 4 in MPECs 2018-Y28, 2018-Y29, 2018-Y30 & 2018-Y31 -- 2018 YB, 2018 YA, 2018 XY5, 2018 XX5|
|G96||Mt. Lemmon Survey in Arizona, 1 in MPEC 2018-Y26 -- 2018 XV5|
|F51||Pan-STARRS 1 (PS1) in Hawaii, 10 in MPECs 2018-Y25, 2018-Y27, 2018-Y28, 2018-Y29, 2018-Y30 & 2018-Y31 -- 2018 YB, 2018 YA, 2018 XY5, 2018 XX5, 2018 XW5, 2018 XS3, 2018 WC1, 2018 KC3, 2010 FY80, 2005 UF1|
|H36||Sandlot Obs. in Kansas, 1 in MPEC 2018-Y31 -- 2018 YB|
|I52||Steward Obs. Mt. Lemmon Station in Arizona, 1 in MPEC 2018-Y26 -- 2018 XV5|
|T12||UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2018-Y25 -- 302169|
|L01||Visnjan Obs., 5 in MPECs 2018-Y26, 2018-Y27, 2018-Y28, 2018-Y29 & 2018-Y31 -- 2018 YB, 2018 XY5, 2018 XX5, 2018 XW5, 2018 XV5|
|C51||WISE in Earth polar orbit, 2 in MPEC 2018-Y25 -- 17274, 4596|
|For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.|
Impact Risk Monitoring on 18 December '18
Notes for Today's Latest Risk Assessments
|2018 XW5||JPL Sentry||2204||2026-2116||39||3.81105e-08||-4.25||-4.70||0||JPL: Computed at 13:36 today Pacific time based on 12 observations spanning 2.7798 days (2018-Dec-14.56157 to 2018-Dec-17.341322). Diameter approximately 0.570 km. from weighted mean H=18.87.|
|2018 XV5||JPL Sentry||2204||2037-2110||16||3.62339e-08||-4.01||-4.28||0||JPL: Computed at 13:29 today Pacific time based on 23 observations spanning 3.5616 days (2018-Dec-14.32034 to 2018-Dec-17.881952). Diameter approximately 0.912 km. from weighted mean H=17.85.|
|2018 XN5||NEODyS||1720||2048-2115||31||1.44e-05||-5.53||-6.09||0||NEODyS: "Based on 12 optical observations (of which 0 are rejected as outliers) from 2018-12-15.310 to 2018-12-17.222."|
|2018 XG5||NEODyS||1720||2030-2118||39||1.02e-06||-3.60||-3.83||-||NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2018-12-13.395 to 2018-12-16.309."|
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 18 December '18
Times are UTC for when items were noted or added by The Tracking News.
|2204||Noted that JPL Sentry has posted 2018 XV5 as an impact risk - see above|
Noted that JPL Sentry has posted 2018 XW5 as an impact risk - see above
|2042||Generated Traffic Report|
|2038||Grabbed MPEC 2018-Y26 - 2018 XV5 - see above|
Grabbed MPEC 2018-Y27 - 2018 XW5 - see above
Grabbed MPEC 2018-Y28 - 2018 XX5 - see above
Grabbed MPEC 2018-Y29 - 2018 XY5 - see above
Grabbed MPEC 2018-Y30 - 2018 YA - see above
Grabbed MPEC 2018-Y31 - 2018 YB - see above
|1720||Noted that NEODyS has posted 2018 XG5 as an impact risk - see above|
Noted that NEODyS has posted 2018 XN5 as an impact risk - see above
Grabbed MPEC 2018-Y25 - Daily Orbit Update - see above