Contents on 17 December '18
- Traffic Report -- twelve objects
- IAU Minor Planet Center
- Observers -- 20 observers
- Impact Risk Monitoring -- four objects
Asteroid/Comet Connection (A/CC) Resources:
- Consolidated Risk Tables - the CRT page
Of 1002 risk-listed objects, 37 have had news in the last 31 days. Updated at 1731 UTC on 17 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 17 December '18
Twelve objects reported inside ten LD
Twelve Solar-System small bodies are reported inside ten lunar distances (LD) of our planet today. The two closest are risk-listed 2018 VO9, outbound from 2.79 to 3.07 LD, and 2018 XS4, headed away from 3.06 to 4.25 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||6.47 to 6.87 LD||Nov. 8 - Dec. 25||intruder, NHATS target|
|1.25 LD Dec. 10||2018 XX3||4 m||6.44 to 7.44 LD||Nov. 30 - Dec. 20||NHATS target, risk|
|1.6 LD Dec. 21*||2018 XC4||19 m||6.5 from 8.2 LD||Dec. 15 - 27||EPU +/- 6 mins.*, NHATS target - DOU|
|2.42 LD Dec. 12||2018 XL1||14 m||6.97 to 8.27 LD||Dec. 5 - 19||NHATS target|
|2.62 LD Dec. 15||2018 VO9||14 m||2.79 to 3.07 LD||Nov. 29 - Dec. 31||NHATS target, risk|
|2.72 LD Dec. 15||2018 XG4||11 m||4.34 to 5.80 LD||Dec. 9 - 20|
|2.76 LD yesterday||2018 XS4||30 m||3.06 to 4.25 LD||Dec. 11 - 21|
|3.49 LD Dec. 11||2013 VX4||62 m||8.67 to 10.04 LD||Dec. 5 - 17||exits ten LD|
|3.92 LD Dec. 2||2018 TG6||12 m||5.60 to 5.80 LD||Oct. 30 - Jan. 5||NHATS target|
|5.32 LD today||2018 XR4||15 m||5.32 LD||Dec. 14 - 21||Earth closest at 2258 UTC, risk|
|5.58 LD Dec. 13||2018 XJ1||18 m||7.71 to 8.74 LD||Dec. 7 - 19|
|7.36 LD Dec. 22||163899 2003 SD220||1.17 km||9.28 from 10.18 LD||today - Dec. 26||radar/NHATS target, enters ten LD - radar|
|* EPU = Earth passage uncertainty|
This report was generated at 1940 UTC with the discovery of approaching risk-listed 2018 XN5 (MPEC) and with first follow-up in today's DOU MPEC for inbound 2018 XC4 and departed 2018 XB5. We also note radar observation posted yesterday of behemoth 163899 2003 SD220, which today enters our ten-LD traffic reporting space.
|Approaching - sorted by 10-LD bubble entry date|
|Earth passage||I D||~Size||Distance today||Inside ten LD||Notes|
|3.0 LD Dec. 24*||2018 XN5||25 m||10.1 from 11.4 LD||tomorrow - Dec. 31||NEW, EPU +/- 52 mins.*, risk - MPEC|
|5.3 LD Dec. 26*||2018 XE4||17 m||19.4 from 21.5 LD||Dec. 22 - 30||EPU +/- 3.33 hours*|
|7.8 LD Jan. 6*||2018 XO4||29 m||18.9 from 19.7 LD||Dec. 30 - Jan. 13||EPU +/- 3.18 hours*, NHATS target|
|7.3 LD Jan. 9*||2013 YM2||19 m||23.0 from 23.9 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. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.
NEOCP Activity on 17 December '18
The MPC's NEO Confirmation Page has 65 listings
When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 65 objects listed. Of these, 36 were "one nighters." So far The Tracking News has counted a total of 86 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 17 December '18
Minor Planet Electronic Circulars
As of last check at 2358 UTC, there have been twelve MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.
- MPEC 2018-Y13 time-stamped "13:05 UT" - Daily Orbit Update - see below
- MPEC 2018-Y14 time-stamped "14:12 UT" - 2018 VG18 - see below
- MPEC 2018-Y15 time-stamped "14:45 UT" - 2018 XF5 - see below
- MPEC 2018-Y16 time-stamped "14:49 UT" - 2018 XG5 - see below
- MPEC 2018-Y17 time-stamped "14:54 UT" - 2018 XH5 - see below
- MPEC 2018-Y18 time-stamped "15:01 UT" - 2018 XJ5 - see below
- MPEC 2018-Y19 time-stamped "15:06 UT" - 2018 XK5 - see below
- MPEC 2018-Y20 time-stamped "15:14 UT" - 2018 XL5 - see below
- MPEC 2018-Y21 time-stamped "15:19 UT" - 2018 XM5 - see below
- MPEC 2018-Y22 time-stamped "15:23 UT" - 2018 XN5 - see below
- MPEC 2018-Y23 time-stamped "15:27 UT" - 2018 XE5 - see below
- MPEC 2018-Y24 time-stamped "20:08 UT" - Comet C/2018 X3 (Panstarrs)
MPEC 2018-Y24 - "20:08 UT" - Comet C/2018 X3 (Panstarrs)
- CK18X030 C/2018 X3 (Panstarrs) (i=43.4°, q=2.699 AU, Q=22.126 AU, TP=2018 Dec. 30.77347 TT) was picked up at 1104 UT on 12 Dec. by Pan-STARRS 1 (PS1), observing it at Dec. 12.46-49p3. This detection was confirmed by Pan-STARRS 2 (PS2) (Oct. 4.59-60p2 & Nov. 2.58-61p3), R. Wainscoat on Mauna Kea (Dec. 14.40-41p3), Magdalena Ridge Obs. (MRO) (Dec. 14.48-50p4), Visnjan Obs. (Dec. 14.95p3), Schiaparelli Obs. (Dec. 15.05-06p3), Farra d'Isonzo Obs. (Dec. 15.84-86p2), Crni Vrh Obs. (Dec. 15.98p2), and the Spacewatch 0.9m telescope (Dec. 16.29-31p3).
MPEC 2018-Y23 - "15:27 UT" - 2018 XE5
- K18X05E 2018 XE5 (risk listed, H=18.5 ~676m) was picked up at 0503 UT on 13 Dec. by PS1, observing it at Dec. 13.21-25p8 at w=21.8-22.4. This detection was confirmed by the Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) (Dec. 14.07-09p3 at G=22.8) and R. Wainscoat/Mauna Kea (Dec. 16.24-25p3 at G=21.84-85 & 17.21-22p3 at G=21.95-22.04).
MPEC 2018-Y22 - "15:23 UT" - 2018 XN5
- K18X05N 2018 XN5 (risk listed, Earth MOID=0.5 LD, H=25.7 ~25m, close passer) was picked up at 0725 UT on 15 Dec. by PS1, observing it at Dec. 15.31-34p3. This detection was confirmed by Visnjan Obs. (Dec. 15.75-76p6) and R. Wainscoat/Mauna Kea (Dec. 17.22p3).
MPEC 2018-Y21 - "15:19 UT" - 2018 XM5
- K18X05M 2018 XM5 (small asteroid, H=24.4 ~45m) was picked up at 0628 UT on 14 Dec. by the Mt. Lemmon Survey (MLS), observing it at Dec. 14.27-29p4 and 16.25p4. This detection was confirmed by MRO (Dec. 14.39-41p4), Steward Obs. Mt. Lemmon Station (Dec. 14.43p4, 15.25p4 & 16.39-40p4), JAXA Space Tracking & Communications Center (JAXA STCC) (Dec. 14.71-72p3), Visnjan Obs. (Dec. 14.96p3), Schiaparelli Obs. (Dec. 15.02-03p2), Farpoint Obs. (Dec. 15.20-21p3), and Sandlot Obs. (Dec. 17.14-18p4).
MPEC 2018-Y20 - "15:14 UT" - 2018 XL5
- K18X05L 2018 XL5 (Q=4.861 AU, H=21.5 ~170m) was picked up at 1419 UT on 13 Dec. by PS1, observing it at Dec. 13.60-64p4. This detection was confirmed by CSS-Kuiper (Dec. 14.44p4 at G=22.0-22.5 & 16.49-51p3 at G=22.0-22.9), Spacewatch 0.9m (Dec. 14.49-52p3), and Visnjan Obs. (Dec. 15.10-11p3).
MPEC 2018-Y19 - "15:06 UT" - 2018 XK5
- K18X05K 2018 XK5 (H=20.7 ~245m) was picked up at 1048 UT on 13 Dec. by ATLAS Haleakala, observing it at Dec. 13.45-47p4. This detection was confirmed by Steward Mt. Lemmon Sta. (Dec. 14.29-31p4), PS1 (Dec. 16.43-45p3), and R. Wainscoat/Mauna Kea (Dec. 17.45-46p3).
MPEC 2018-Y18 - "15:01 UT" - 2018 XJ5
- K18X05J 2018 XJ5 (Q=4.193 AU, H=19.5 ~426m) was picked up at 0931 UT on 13 Dec. by ATLAS Haleakala, observing it at Dec. 13.40-42p4 and 13.47-52p6. This detection was confirmed by Steward Mt. Lemmon Sta. (Dec. 14.18-19p4), Visnjan Obs. (Dec. 14.93-94p4), and PS1 (Dec. 17.37-39p3).
MPEC 2018-Y17 - "14:54 UT" - 2018 XH5
- K18X05H 2018 XH5 (small asteroid, H=25.0 ~34m) was picked up at 0927 UT on 13 Dec. by PS1, observing it at Dec. 13.39-43p3 at w=21.2-22.1. This detection was confirmed by R. Wainscoat/Mauna Kea (Dec. 14.41p3) and the Spacewatch 1.8m telescope (Dec. 16.28-30p3).
MPEC 2018-Y16 - "14:49 UT" - 2018 XG5
- K18X05G 2018 XG5 (risk listed, Earth MOID=0.7 LD, H=20.3 ~295m) was picked up at 0927 UT on 13 Dec. by PS1, observing it at Dec. 13.39-43p4. This detection was confirmed by Steward Mt. Lemmon Sta. (Dec. 14.21-22p4), MLS (Dec. 14.29-31p4), Spacewatch 0.9m (Dec. 14.45-46p2 & 16.29-31p3), and Visnjan Obs. (Dec. 14.99p3).
MPEC 2018-Y15 - "14:45 UT" - 2018 XF5
- K18X05F 2018 XF5 (small asteroid, H=23.5 ~68m) was picked up at 0926 UT on 13 Dec. by PS1, observing it at Dec. 13.39-43p4 at w=21.8-22.3. This detection was confirmed by Spacewatch 0.9m (Dec. 14.38-41p3 at R=21.9-22.1) and R. Wainscoat/Mauna Kea (Dec. 17.31p3).
MPEC 2018-Y14 - "14:12 UT" - 2018 VG18
- K18V18G 2018 VG18 (q=21.739 AU, Q=168.730 AU, H=3.6 ~645 km) was picked up at 1315 UT on 10 Nov. by Scott Sheppard on Mauna Kea, observing it at Nov. 10.55p1 at V=24.6 and 10.60p1 at V=24.5. This detection was confirmed by Las Campanas Obs. (Dec. 3.18p1 at V=24.5, 3.30p1, 4.12p1, 8.20-23p2, 9.14p1 at r=24.6, 10.17p1 at r=24.5, 11.21p1 & 12.21p1 at r=24.6).
- Observations of recently (no longer) risk-listed objects
- K18W01R 2018 WR1 (arc=20 days, H=20.3 ~295m) from PS1 (Dec. 17.31-35p3)
- Observations of close-passing objects
- K18X05B 2018 XB5 (arc=2 days, H=24.3 ~47m) from ATLAS Mauna Loa (Dec. 16.41-44p5)
- K18X04C 2018 XC4 (arc=3 days, H=26.3 ~19m, NHATS target) from ATLAS Mauna Loa (Dec. 16.40-43p3 & 16.50-55p6)
- Observations of other objects
- K18X02Z 2018 XZ2 (Q=4.479 AU, arc=6 days, H=21.5 ~170m) from ATLAS Mauna Loa (Dec. 16.32-35p4)
- K18V09B 2018 VB9 (Q=4.083 AU, arc=51 days, H=19.5 ~426m) from PS1 (Dec. 16.38-42p3)
- K18V03N 2018 VN3 (arc=40 days, H=21.3 ~186m) from PS1 (Dec. 16.38-41p4)
- K18S02X 2018 SX2 (arc=80 days, H=20.7 ~245m) from PS1 (Dec. 17.26-30p7)
- K15Y07U 2015 YU7 (arc=2 opp, H=21.3 ~186m) from ATLAS Mauna Loa (Dec. 16.50-53p4)
- K14J54U 2014 JU54 (arc=3 opp, H=19.8 ~371m) from PS1 (Dec. 16.48-51p3)
- K11O05L 2011 OL5 (arc=3 opp, H=20.2 ~309m) from PS1 (Dec. 16.38-41p3)
- q3811 523811 2008 TQ2 from ATLAS Mauna Loa (Dec. 16.49-51p3)
- j9458 459458 2012 XR134 from Purple Mtn. Obs. Xuyi Station (Dec. 16.81-84p3)
- X3521 333521 2005 PO from PS1 (Dec. 17.26-30p3)
- E0928 140928 2001 VG75 from PS1 (Dec. 16.39-41p2)
- D8175 138175 2000 EE104 from PS1 (Dec. 16.58-62p4)
- 02340 2340 Hathor (1976 UA) from ATLAS Mauna Loa (Dec. 16.48-50p4)
Observers on 17 December '18
A total of 20 observers appear in today's MPECs.
|Code||Observer / observatory|
|T05||ATLAS Haleakala in Hawaii, 2 in MPECs 2018-Y18 & 2018-Y19 -- 2018 XK5, 2018 XJ5|
|T08||ATLAS Mauna Loa in Hawaii, 6 in MPEC 2018-Y13 -- 2018 XZ2, 2018 XC4, 2018 XB5, 2015 YU7, 523811, 2340|
|V06||Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) in Arizona, 2 in MPECs 2018-Y20 & 2018-Y23 -- 2018 XL5, 2018 XE5|
|106||Crni Vrh Obs. in Slovenia, 1 in MPEC 2018-Y24 -- C/2018 X3|
|734||Farpoint Obs. in Kansas, 1 in MPEC 2018-Y21 -- 2018 XM5|
|595||Farra d'Isonzo Obs. in Italy, 1 in MPEC 2018-Y24 -- C/2018 X3|
|P93||JAXA Space Tracking & Communications Center in Japan, 1 in MPEC 2018-Y21 -- 2018 XM5|
|304||Las Campanas Obs. in Chile, 1 in MPEC 2018-Y14 -- 2018 VG18|
|H01||Magdalena Ridge Obs. (MRO) in New Mexico, 2 in MPECs 2018-Y21 & 2018-Y24 -- 2018 XM5, C/2018 X3|
|5685||Scott Sheppard on Mauna Kea in Hawaii, 1 in MPEC 2018-Y14 -- 2018 VG18|
|568^||R. Wainscoat on Mauna Kea in Hawaii, 6 in MPECs 2018-Y15, 2018-Y17, 2018-Y19, 2018-Y22, 2018-Y23 & 2018-Y24 -- 2018 XN5, 2018 XK5, 2018 XH5, 2018 XF5, 2018 XE5, C/2018 X3|
|G96||Mt. Lemmon Survey (MLS) in Arizona, 2 in MPECs 2018-Y16 & 2018-Y21 -- 2018 XM5, 2018 XG5|
|F51||Pan-STARRS 1 (PS1) in Hawaii, 18 in MPECs 2018-Y13, 2018-Y15, 2018-Y16, 2018-Y17, 2018-Y18, 2018-Y19, 2018-Y20, 2018-Y22, 2018-Y23 & 2018-Y24 -- 2018 XN5, 2018 XL5, 2018 XK5, 2018 XJ5, 2018 XH5, 2018 XG5, 2018 XF5, 2018 XE5, C/2018 X3, 2018 WR1, 2018 VN3, 2018 VB9, 2018 SX2, 2014 JU54, 2011 OL5, 333521, 140928, 138175|
|F52||Pan-STARRS 2 in Hawaii, 1 in MPEC 2018-Y24 -- C/2018 X3|
|D29||Purple Mtn. Obs. Xuyi Station in China, 1 in MPEC 2018-Y13 -- 459458|
|H36||Sandlot Obs. in Kansas, 1 in MPEC 2018-Y21 -- 2018 XM5|
|204||Schiaparelli Obs. in Italy, 2 in MPECs 2018-Y21 & 2018-Y24 -- 2018 XM5, C/2018 X3|
|691||Spacewatch 0.9m telescope in Arizona, 4 in MPECs 2018-Y15, 2018-Y16, 2018-Y20 & 2018-Y24 -- 2018 XL5, 2018 XG5, 2018 XF5, C/2018 X3|
|291||Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2018-Y17 -- 2018 XH5|
|I52||Steward Obs. Mt. Lemmon Station in Arizona, 4 in MPECs 2018-Y16, 2018-Y18, 2018-Y19 & 2018-Y21 -- 2018 XM5, 2018 XK5, 2018 XJ5, 2018 XG5|
|L01||Visnjan Obs., 6 in MPECs 2018-Y16, 2018-Y18, 2018-Y20, 2018-Y21, 2018-Y22 & 2018-Y24 -- 2018 XN5, 2018 XM5, 2018 XL5, 2018 XJ5, 2018 XG5, C/2018 X3|
|For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.|
Impact Risk Monitoring on 17 December '18
Notes for Today's Latest Risk Assessments
|2018 XN5||JPL Sentry||1730||2065-2115||14||1.47660679e-05||-5.54||-6.02||0||JPL: Computed at 08:31 today Pacific time based on 12 observations spanning 1.9116 days (2018-Dec-15.30928 to 2018-Dec-17.22092). Diameter approximately 0.025 km. from weighted mean H=25.69.|
|2018 XG5||JPL Sentry||1730||2030-2116||33||1.0870907e-06||-3.62||-3.97||0||JPL: Computed at 07:58 today Pacific time based on 20 observations spanning 2.9144 days (2018-Dec-13.39431 to 2018-Dec-16.30868). Diameter approximately 0.265 km. from weighted mean H=20.52.|
|2018 XE5||JPL Sentry||1730||2029-2079||2||1.0595e-09||-5.39||-5.57||0||JPL: Computed at 08:27 today Pacific time based on 17 observations spanning 4.0067 days (2018-Dec-13.21052 to 2018-Dec-17.217264). Diameter approximately 0.620 km. from weighted mean H=18.69.|
|2014 JT79||JPL Sentry||1730||2018-2116||1132||1.8690016e-06||-6.29||-7.51||0||JPL: Computed at 19:19 April 6th of 2017 Pacific time based on 11 observations spanning 2.8075 days (2014-May-02.40649 to 2014-May-05.21401). Diameter approximately 0.013 km. from weighted mean H=27.12.|
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 17 December '18
Times are UTC for when items were noted or added by The Tracking News.
|2102||Grabbed MPEC 2018-Y24 - Comet C/2018 X3 (Panstarrs) - see above|
|1940||Generated Traffic Report|
|1730||Noted that JPL Sentry has updated its 2014 JT79 risk assessment - see above|
Noted that JPL Sentry has posted 2018 XE5 as an impact risk - see above
Noted that JPL Sentry has posted 2018 XG5 as an impact risk - see above
Noted that JPL Sentry has posted 2018 XN5 as an impact risk - see above
Grabbed MPEC 2018-Y13 - Daily Orbit Update - see above
Grabbed MPEC 2018-Y14 - 2018 VG18 - see above
Grabbed MPEC 2018-Y15 - 2018 XF5 - see above
Grabbed MPEC 2018-Y16 - 2018 XG5 - see above
Grabbed MPEC 2018-Y17 - 2018 XH5 - see above
Grabbed MPEC 2018-Y18 - 2018 XJ5 - see above
Grabbed MPEC 2018-Y19 - 2018 XK5 - see above
Grabbed MPEC 2018-Y20 - 2018 XL5 - see above
Grabbed MPEC 2018-Y21 - 2018 XM5 - see above
Grabbed MPEC 2018-Y22 - 2018 XN5 - see above
Grabbed MPEC 2018-Y23 - 2018 XE5 - see above