Contents  on 10 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 10 January '20

Thirteen objects reported inside ten LD

There are thirteen minor planets reported to be less than ten lunar distances (LD) from Earth today. Nearest are 2020 AT1, which is outbound from 2.56 to 3.23 LD, and 2019 YF4, which comes its closest to our planet this time around -- 3.71 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
0.85 LD Jan. 2 2020 AP1 4 m  9.02 to 10.23 LD Dec. 25 - today intruder, NHATS target, exits ten LD
2.47 LD yesterday 2020 AT1 11 m  2.56 to 3.23 LD Jan. 2 - 16 NHATS target
3.27 LD Jan. 4 2019 YB4 15 m  8.24 to 9.51 LD Dec. 28 - tomorrow NHATS target
3.71 LD today 2019 YF4 14 m  3.71 LD Dec. 27 - Jan. 25 NHATS target, Earth closest at 0924 UTC
3.8   LD Jan. 12* 2020 AB2 14 m  5.2 from 6.5 LD Jan. 7 - 18 EPU +/- 10 mins.*, NHATS target
4.13 LD Jan. 6 2020 AU1 17 m  6.95 to 8.12 LD Dec. 30 - Jan. 12 DOU
4.76 LD Jan. 6 2020 AW 6 m  6.06 to 6.69 LD Dec. 27 - Jan. 15 NHATS target, risk
6.20 LD today 2020 AL2 26 m  6.20 LD Jan. 8 - 11 Earth closest at 0609 UTC
6.33 LD tomorrow 2019 WC5 105 m  6.37 from 7.32 LD Jan. 8 - 13 DOU
6.5   LD Jan. 13* 2020 AE1 11 m  7.0 from 7.4 LD Jan. 5 - 21 EPU +/- 1.28 hours*, NHATS target
6.86 LD Jan. 16 2019 YD3 21 m  8.92 from 9.67 LD yesterday - Jan. 22 NHATS target
6.91 LD Jan. 8 2020 AR1 12 m  7.90 to 9.13 LD Jan. 4 - 11 risk
8.2   LD Jan. 16* 2020 AZ1 16 m  9.4 from 9.8 LD yesterday - Jan. 22 EPU +/- 5 mins.*, NHATS target
* EPU = Earth passage uncertainty

This report was generated at 2020 UTC with follow-up in today's DOU MPEC for approaching risk-listed 2020 AO1, inbound 2019 WC5, outbound 2020 AU1, and, from a couple weeks ago, first follow-up for 2019 XP1 (18.54 days added to 2.55-day discovery arc), plus astrometry from September for risk-listed 2019 SO6.

Approaching - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
8.51 LD Jan. 12 2020 AO1 62 m  11.13 from 14.04 LD tomorrow - Jan. 14 risk - DOU
9.93 LD Jan. 13 2020 AX2 28 m  10.58 from 11.20 LD Jan. 12 - 14 NHATS target
9.08 LD Jan. 17 2020 AD1 18 m  11.47 from 12.13 LD Jan. 13 - 22 NHATS target
9.31 LD Jan. 14 2020 AO 46 m  18.90 from 22.81 LD Jan. 13 - 15

See also our new "Earth's Busy Neighborhood" with its more frequently updated traffic reporting.



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 10 January '20

The MPC's NEO Confirmation Page has 16 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had sixteen objects listed. Of these, seven were "one nighters." So far The Tracking News has counted a total of 20 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 10 January '20

Minor Planet Electronic Circulars

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


MPEC 2020-A113 - "21:11 UT" - S/2018 (3548) 1

Quote: "detection of a satellite of the Trojan asteroid (3548) Eurybates [using] the Hubble Space Telescope's Wide Field Camera 3 (WFC3)"


MPEC 2020-A112 - "20:12 UT" - Comet C/2019 Y4 (ATLAS)


MPEC 2020-A111 - "17:35 UT" - 2019 YX6


<< DOU on 10 January '20 >>  MPEC 2020-A110 - "12:00 UT" - Daily Orbit Update

Observers  on 10 January '20

A total of 58 observers appear in today's MPECs.

CodeObserver / observatory
L2729PREMOTE Obs., 2 in MPECs 2020-A111 & 2020-A112 -- 2019 YX6, C/2019 Y4
1192program code 2 via Abastumani Obs. in Georgia, 1 in MPEC 2020-A110 -- 2020 AV2
H21Astronomical Research Obs. Westfield in Illinois, 18 in MPECs 2020-A110 & 2020-A111 -- 2020 AO1, 2019 YX6, 2019 XW2, 2019 WC5, 2019 SO6, 2019 SC5, 2014 NF64, 2013 PV2, 2012 US68, 86326, 52768, 437316, 333555, 163696, 106538, 103067, 6239, 5626
T08ATLAS Mauna Loa in Hawaii, 3 in MPECs 2020-A110, 2020-A111 & 2020-A112 -- 2019 YX6, C/2019 Y4, 9400
I47Auger Obs. in Argentina, 1 in MPEC 2020-A111 -- 2019 YX6
C77Bernezzo Obs. in Italy, 1 in MPEC 2020-A111 -- 2019 YX6
L54Berthelot Obs., 1 in MPEC 2020-A110 -- 2014 NF64
B96Brixiis Obs. in Belgium, 1 in MPEC 2020-A111 -- 2019 YX6
160Castelmartini Obs. in Italy, 1 in MPEC 2020-A111 -- 2019 YX6
703Catalina Sky Survey in Arizona, 1 in MPEC 2020-A112 -- C/2019 Y4
A77Chante-Perdrix Obs. in France, 2 in MPECs 2020-A111 & 2020-A112 -- 2019 YX6, C/2019 Y4
Z99Clixby Obs. in England, 1 in MPEC 2020-A112 -- C/2019 Y4
K87Dettelbach Vineyard Obs. in Germany, 1 in MPEC 2020-A112 -- C/2019 Y4
J04ESA Optical Ground Station in the Canary Islands, 1 in MPEC 2020-A111 -- 2019 YX6
595Farra d'Isonzo Obs. in Italy, 2 in MPECs 2020-A111 & 2020-A112 -- 2019 YX6, C/2019 Y4
157Frasso Sabino Obs. in Italy, 1 in MPEC 2020-A112 -- C/2019 Y4
E89Geyserland Obs. in New Zealand, 2 in MPEC 2020-A110 -- 137925, 2059
203GiaGa Obs. in Italy, 2 in MPECs 2020-A111 & 2020-A112 -- 2019 YX6, C/2019 Y4
K88GINOP-KHK in Hungary, 2 in MPECs 2020-A111 & 2020-A112 -- 2019 YX6, C/2019 Y4
J95Great Shefford Obs. in England, 1 in MPEC 2020-A111 -- 2019 YX6
C43Hoyerswerda Obs. in Germany, 2 in MPECs 2020-A111 & 2020-A112 -- 2019 YX6, C/2019 Y4
H06iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2020-A112 -- C/2019 Y4
H06|Hidetaka Sato in Japan via iTelescope Obs. Mayhill in New Mexico, 2 in MPECs 2020-A111 & 2020-A112 -- 2019 YX6, C/2019 Y4
I89iTelescope Obs. Nerpio in Spain, 1 in MPEC 2020-A112 -- C/2019 Y4
I892program code 2 via iTelescope Obs. Nerpio in Spain, 1 in MPEC 2020-A112 -- C/2019 Y4
695^Spacewatch via Kitt Peak Natl. Obs. in Arizona, 1 in MPEC 2020-A110 -- 2008 PG2
246KLENOT in the Czech Republic, 1 in MPEC 2020-A112 -- C/2019 Y4
Z43Landehen Obs., 1 in MPEC 2020-A110 -- 2020 AU1
V37LCO McDonald Obs. in Texas, 1 in MPEC 2020-A111 -- 2019 YX6
598Loiano Obs. in Italy, 1 in MPEC 2020-A111 -- 2019 YX6
K38M57 Obs. in Italy, 2 in MPECs 2020-A111 & 2020-A112 -- 2019 YX6, C/2019 Y4
C10Maisoncelles Obs. in France, 2 in MPECs 2020-A111 & 2020-A112 -- 2019 YX6, C/2019 Y4
711McDonald Obs. in Texas, 1 in MPEC 2020-A111 -- 2019 YX6
118Modra Obs. in Slovakia, 1 in MPEC 2020-A112 -- C/2019 Y4
449MPC code 449, 1 in MPEC 2020-A112 -- C/2019 Y4
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPECs 2020-A110 & 2020-A112 -- C/2019 Y4, 2011 WU2
C82Nastro Verde Obs. in Italy, 1 in MPEC 2020-A111 -- 2019 YX6
L02NOAK Obs., 1 in MPEC 2020-A111 -- 2019 YX6
C47Nonndorf Obs. in Austria, 1 in MPEC 2020-A111 -- 2019 YX6
Z80Northolt Branch Obs. in England, 3 in MPECs 2020-A110 & 2020-A111 -- 2019 YX6, 2014 NF64, 437316
K63Pascoli Obs. in Italy, 1 in MPEC 2020-A111 -- 2019 YX6
B49Paus Obs. in Spain, 1 in MPEC 2020-A111 -- 2019 YX6
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2020-A111 -- 2019 YX6
H36Sandlot Obs. in Kansas, 2 in MPECs 2020-A111 & 2020-A112 -- 2019 YX6, C/2019 Y4
C95SATINO-1 in France, 3 in MPECs 2020-A110, 2020-A111 & 2020-A112 -- 2019 YX6, C/2019 Y4, 2010 DN1
204Schiaparelli Obs. in Italy, 2 in MPECs 2020-A111 & 2020-A112 -- 2019 YX6, C/2019 Y4
033Schwarzschild Obs. in Germany, 2 in MPECs 2020-A111 & 2020-A112 -- 2019 YX6, C/2019 Y4
Q11Shinshiro Obs., 2 in MPECs 2020-A111 & 2020-A112 -- 2019 YX6, C/2019 Y4
G40"G. Gasparovic in Croatia via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2020-A112 -- C/2019 Y4
G40%program code "%" (14) via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2020-A110 -- 2020 AV2
G409B. Lutkenhoner in Germany via Slooh.com Canary Islands Obs. in the Canary Islands, 2 in MPECs 2020-A111 & 2020-A112 -- 2019 YX6, C/2019 Y4
587Sormano Obs. in Italy, 1 in MPEC 2020-A111 -- 2019 YX6
L06Sormano2 Obs. in Italy, 1 in MPEC 2020-A112 -- C/2019 Y4
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2020-A110 -- 1996 AE2
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2020-A111 -- 2019 YX6
I52Steward Obs. Mt. Lemmon Station in Arizona, 2 in MPECs 2020-A111 & 2020-A112 -- 2019 YX6, C/2019 Y4
A71Stixendorf Obs. in Austria, 1 in MPEC 2020-A112 -- C/2019 Y4
A16Tentlingen Obs. in Switzerland, 4 in MPEC 2020-A110 -- 192563, 141052, 137925, 9400
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPECs 2020-A110 & 2020-A112 -- C/2019 Y4, 2019 XP1
L01Visnjan Obs., 2 in MPECs 2020-A111 & 2020-A112 -- 2019 YX6, C/2019 Y4
198Wildberg Obs. in Germany, 1 in MPEC 2020-A111 -- 2019 YX6
C42Xingming Obs. in China, 1 in MPEC 2020-A112 -- C/2019 Y4
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 10 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
2020 AO1JPL Sentry16402049-204919.077e-08-6.01-6.010JPL: Computed at 06:02 today Pacific time based on 89 observations spanning 5.0252 days (2020-Jan-04.27153 to 2020-Jan-09.296698). Diameter approximately 0.062 km. from weighted mean H=23.68.
NEODyS1640204915.59e-08-6.24-6.240NEODyS: "Based on 89 optical observations (of which 0 are rejected as outliers) from 2020-01-04.272 to 2020-01-09.297."
2019 SO6NEODyS16402077-210929.57e-09-8.11-8.260NEODyS: "Based on 23 optical observations (of which 0 are rejected as outliers) from 2019-09-26.296 to 2019-10-06.316."

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 10 January '20

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

2139Grabbed MPEC 2020-A113 - S/2018 (3548) 1 - see above
2030Grabbed MPEC 2020-A112 - Comet C/2019 Y4 (ATLAS) - see above
2020Generated Traffic Report
1746Grabbed MPEC 2020-A111 - 2019 YX6 - see above
1640Noted that NEODyS has updated its 2019 SO6 risk assessment - see above
Noted that JPL Sentry has updated its 2020 AO1 risk assessment - see above
Noted that NEODyS has updated its 2020 AO1 risk assessment - see above
Grabbed MPEC 2020-A110 - Daily Orbit Update - see above