Contents  on 11 January '20

Asteroid/Comet Connection (A/CC) Resources:

The latest A/CC news is available via framed access, RSS news feed RSS news feed, or redirection.

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 11 January '20

Thirteen objects reported inside ten LD

Thirteen Solar-System small bodies are reported inside ten lunar distances (LD) of our home world today. Closest are 2020 AT1, outbound from 3.23 to 4.27 LD, and 2019 YF4, moving away from 3.73 to 3.86 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
2.47 LD Jan. 9 2020 AT1 11 m  3.23 to 4.27 LD Jan. 2 - 16 NHATS target
3.27 LD Jan. 4 2019 YB4 15 m  9.51 to 10.82 LD Dec. 28 - today NHATS target, exits ten LD
3.71 LD yesterday 2019 YF4 14 m  3.73 to 3.86 LD Dec. 27 - Jan. 25 NHATS target - DOU
3.8   LD tomorrow* 2020 AB2 14 m  4.2 from 5.2 LD Jan. 7 - 18 EPU +/- 10 mins.*, NHATS target
4.13 LD Jan. 6 2020 AU1 17 m  8.12 to 9.35 LD Dec. 30 - tomorrow
4.76 LD Jan. 6 2020 AW 6 m  6.69 to 7.38 LD Dec. 27 - Jan. 15 NHATS target, risk
6.20 LD yesterday 2020 AL2 26 m  7.46 to 11.53 LD Jan. 8 - 11 exits ten LD
6.33 LD today 2019 WC5 105 m  6.33 LD Jan. 8 - 13 Earth closest at 0613 UTC - DOU
6.5   LD Jan. 13* 2020 AE1 11 m  6.7 from 7.0 LD Jan. 5 - 21 EPU +/- 1.28 hours*, NHATS target
6.86 LD Jan. 16 2019 YD3 21 m  8.26 from 8.92 LD Jan. 9 - 22 NHATS target
6.91 LD Jan. 8 2020 AR1 12 m  9.13 to 10.66 LD Jan. 4 - 11 exits ten LD, risk
8.2   LD Jan. 16* 2020 AZ1 16 m  9.0 from 9.4 LD Jan. 9 - 22 EPU +/- 5 mins.*, NHATS target
8.51 LD tomorrow 2020 AO1 62 m  9.09 from 11.13 LD today - Jan. 14 enters ten LD, risk
* EPU = Earth passage uncertainty

This report was generated at 1954 UTC with follow-up in today's DOU MPEC for passing 2019 WC5, outbound radar target 2019 YF4, and departed 2020 AV1, plus, from August-September, astrometry for 2019 SE5, 2019 QD1, and radar targets 2019 SW5 and 2019 SU3. We also note radar observation from late December of risk-listed 2019 YX1.

Approaching - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
9.93 LD Jan. 13 2020 AX2 28 m  10.16 from 10.58 LD tomorrow - Jan. 14 NHATS target
9.08 LD Jan. 17 2020 AD1 18 m  10.87 from 11.47 LD Jan. 13 - 22 NHATS target
9.31 LD Jan. 14 2020 AO 46 m  15.24 from 18.90 LD Jan. 13 - 15

Our new "Earth's Busy Neighborhood" presents improved and interactive traffic tables.



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.

Radar Astrometry  on 11 January '20

Radar observation of one object

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:


Data update noted at 1720 UTC when the database was dated 10 Jan.



Photometry and some astrometry is needed for upcoming radar targets. See Arecibo and Goldstone schedules.

NEOCP Activity  on 11 January '20

The MPC's NEO Confirmation Page has 15 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had fifteen objects listed. Of these, eight were "one nighters." So far The Tracking News has counted a total of seventeen 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 11 January '20

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been three MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2020-A116 - "18:13 UT" - 2020 AE3


MPEC 2020-A115 - "18:02 UT" - 2020 AD3


<< DOU on 11 January '20 >>  MPEC 2020-A114 - "12:00 UT" - Daily Orbit Update

Observers  on 11 January '20

A total of 21 observers appear in today's MPECs.

CodeObserver / observatory
251Arecibo in Puerto Rico, 1 in radar -- 2019 YX1
H21Astronomical Research Obs. Westfield in Illinois, 21 in MPEC 2020-A114 -- 2019 XW2, 2019 WC5, 2019 VX1, 2019 VU4, 2019 SW5, 2019 SE5, 2019 QD1, 2019 QA1, 2019 PR, 2019 PQ3, 2019 PF1, 2019 LN, 2014 NF64, 2007 VC191, 86326, 437316, 333555, 163696, 106538, 103067, 5626
L54Berthelot Obs., 1 in MPEC 2020-A114 -- 2019 AQ3
160Castelmartini Obs. in Italy, 22 in MPEC 2020-A114 -- 2016 UT80, 2013 PV2, 90075, 86326, 85628, 52768, 458745, 416591, 36284, 34613, 30825, 276397, 203015, 163373, 141052, 137924, 137199, 137120, 103067, 10115, 5626, 1627
703Catalina Sky Survey in Arizona, 1 in MPEC 2020-A115 -- 2020 AD3
Z99Clixby Obs. in England, 1 in MPEC 2020-A114 -- 2020 AV1
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2020-A115 -- 2020 AD3
W46Foxfire Village Obs., 1 in MPEC 2020-A114 -- 2019 SU3
203GiaGa Obs. in Italy, 3 in MPECs 2020-A114 & 2020-A115 -- 2020 AD3, 2019 YF4, 2016 XO23
J95Great Shefford Obs. in England, 2 in MPEC 2020-A114 -- 2020 AE, 2011 ES4
V37LCO McDonald Obs. in Texas, 1 in MPEC 2020-A115 -- 2020 AD3
H01Magdalena Ridge Obs. (MRO) in New Mexico, 2 in MPECs 2020-A115 & 2020-A116 -- 2020 AE3, 2020 AD3
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2020-A116 -- 2020 AE3
557Ondrejov Obs. in the Czech Republic, 1 in MPEC 2020-A114 -- 85236
C95SATINO-1 in France, 2 in MPECs 2020-A114 & 2020-A115 -- 2020 AD3, 2011 ME5
204Schiaparelli Obs. in Italy, 1 in MPEC 2020-A115 -- 2020 AD3
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2020-A115 -- 2020 AD3
I52Steward Obs. Mt. Lemmon Station in Arizona, 1 in MPEC 2020-A115 -- 2020 AD3
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2020-A114 -- 2019 VY3
L01Visnjan Obs., 2 in MPECs 2020-A115 & 2020-A116 -- 2020 AE3, 2020 AD3
C51WISE in Earth polar orbit, 1 in MPEC 2020-A114 -- 2011 VR5
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 11 January '20

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2358 UTC)
See the CRT page for a list of all objects rated recently as risks and our ephemerides page for a list of risk-listed objects under current observation.
The time horizon for JPL and NEODyS listings is 100 years, and both post impact solutions beyond that for some special objects.
For the latest official risk assessments, and for explanations of the terminology, see the NASA/JPL Sentry and NEODyS CLOMON2 risk pages.
0000NNN000

Object

Risk
Monitor
When
Noted
UTC
0000T0000
Year
Range

VI
#
000NN00
Prob
Cum
T0000
PS
Cum
T0000
PS
Max

T
S


Notes for Today's Latest Risk Assessments
2019 YX1JPL Sentry1720R E M O V E DJPL: Risk listing removed at 0730 UTC today
2011 ES4JPL Sentry17202031-2112755.38789188e-05-4.66-5.120JPL: Computed at 05:58 today Pacific time based on 44 observations spanning 4.0327 days (2011-Mar-02.19847 to 2011-Mar-06.23118). Diameter approximately 0.025 km. from weighted mean H=25.68.

Legend: VI# = VI count, Prob Cum = cumulative probability, PS Cum/Max = cumulative/maximum Palermo Scale, TS = Torino Scale (next 100 years)

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 11 January '20

Times are UTC for when items were noted or added by The Tracking News.

1954Generated Traffic Report
1900Grabbed MPEC 2020-A115 - 2020 AD3 - see above
Grabbed MPEC 2020-A116 - 2020 AE3 - see above
1720Noted that JPL Sentry has updated its 2011 ES4 risk assessment - see above
Noted that JPL Sentry has removed 2019 YX1 as an impact risk - see above
Grabbed MPEC 2020-A114 - Daily Orbit Update - see above
Noted Radar Astrometry database update - see above