Contents  on 3 December '19

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 3 December '19

Six objects reported inside ten LD

Bulletin - 2342 UTC:  Two new discoveries of close passers have been announced.

Earth passageI D~Size~Inside ten LDNotes
2.43 LD at 1148 UTC Dec. 62019 XN10 m  unavailable MPEC
5.18 LD at 0140 UTC Nov. 302019 XM8 m  unavailable MPEC


There are six small celestial objects reported inside ten lunar distances (LD) of our home world today. Nearest are 2019 WN1, outbound from 5.0 to 6.4 LD*, and 2019 WH2, moving away from 5.04 to 6.89 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 Nov. 30 2019 WJ4 7 m  9.03 to 13.17 LD Nov. 28 - today intruder, exits ten LD
3.43 LD Dec. 1 2019 WH2 15 m  5.04 to 6.89 LD Nov. 27 - Dec. 5
4.3   LD Dec. 1* 2019 WN1 17 m  5.0 to 6.4 LD Nov. 27 - Dec. 5 EPU +/- 3.15 hours*
5.81 LD yesterday 2019 WH4 12 m  5.98 to 6.64 LD Nov. 27 - Dec. 6
8.5   LD today* 2017 AP4 14 m  8.5 LD Nov. 30 - Dec. 7 EPU +/- 2.97 days*, Earth closest at 2153 UTC
8.61 LD Dec. 5 2019 WW 41 m  8.92 from 9.72 LD yesterday - Dec. 7 NEW, NHATS target
Approaching - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
4.8   LD Dec. 9* 2019 WO2 32 m  11.0 from 12.5 LD tomorrow - Dec. 14 EPU +/- 10 mins.*
7.45 LD Dec. 7 2019 WJ6 44 m  18.53 from 22.97 LD Dec. 6 - 8 NEW - MPEC
9.78 LD Dec. 9 2019 WT3 39 m  16.97 from 19.08 LD Dec. 8 - 10 DOU
9.5   LD Dec. 18* 2019 XF 74 m  79.1 from 84.7 LD Dec. 17 - 18 NEW, EPU +/- 3.65 hours* - MPEC
6.3   LD Jan. 11* 2019 WC5 107 m  122.2 from 126.0 LD Jan. 8 - 13 EPU +/- 14.68 hours*, risk - DOU
* EPU = Earth passage uncertainty

This report was generated at 1844 UTC with the discoveries of approaching objects 2019 XF (MPEC) and 2019 WJ6 (MPEC), and of already departed 2019 XD (MPEC), which flew by us at 7.74 LD on November 29th. Today's DOU MPEC has follow-up for approaching objects 2019 WT3 and risk-listed 2019 WC5, and for departed objects 2019 WQ3 and 2019 UO13, plus astrometry from September for 2019 RA and from February for 2019 BF5.
        Update 2200 UTC:  A data cross-check revealed that we had missed 2019 WW, an inbound close passer that has now been added to our 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 3 December '19

The MPC's NEO Confirmation Page has 78 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 78 objects listed. Of these, 44 were "one nighters." So far The Tracking News has counted a total of 101 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 3 December '19

Minor Planet Electronic Circulars

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


MPEC 2019-X41 - "23:29 UT" - 2019 WM6


MPEC 2019-X40 - "23:28 UT" - 2019 XN


MPEC 2019-X39 - "23:21 UT" - 2019 XM


MPEC 2019-X38 - "23:11 UT" - 2019 XL


MPEC 2019-X37 - "23:08 UT" - 2019 XK


MPEC 2019-X36 - "22:17 UT" - 2019 WL6


MPEC 2019-X35 - "13:24 UT" - 2019 XH


MPEC 2019-X34 - "13:20 UT" - 2019 XG


MPEC 2019-X33 - "13:11 UT" - 2019 XF


MPEC 2019-X32 - "12:51 UT" - 2002 JZ8


<< DOU on 3 December '19 >>  MPEC 2019-X31 - "12:02 UT" - Daily Orbit Update


MPEC 2019-X30 - "07:27 UT" - 2019 XD


MPEC 2019-X29 - "07:21 UT" - 2019 XC


MPEC 2019-X28 - "07:20 UT" - 2019 XB


MPEC 2019-X27 - "07:16 UT" - 2019 WJ6


MPEC 2019-X26 - "07:13 UT" - 2019 WH6

Observers  on 3 December '19

A total of 23 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 5 in MPEC 2019-X31 -- 2019 UB, 2019 RA, 2019 QV4, 2019 MJ, 2019 BF5
Z84Calar Alto Schmidt in Spain, 1 in MPEC 2019-X36 -- 2019 WL6
703Catalina Sky Survey (CSS) in Arizona, 25 in MPECs 2019-X26, 2019-X27, 2019-X28 & 2019-X31 -- 2019 XB, 2019 WJ6, 2019 WH6, 2019 UJ15, 2017 NQ6, 2011 YS62, 89830, 85236, 459046, 338347, 311044, 303262, 238063, 203015, 174806, 163696, 138846, 138175, 137084, 137064, 137052, 11885, 6455, 3200, 1866
V06Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) in Arizona, 3 in MPECs 2019-X29, 2019-X31 & 2019-X33 -- 2019 XF, 2019 XC, 2016 GZ215
006Fabra Obs. in Spain, 2 in MPEC 2019-X31 -- 99248, 162723
K88GINOP-KHK in Hungary, 2 in MPECs 2019-X28 & 2019-X37 -- 2019 XK, 2019 XB
J95Great Shefford Obs. in England, 3 in MPECs 2019-X30, 2019-X38 & 2019-X40 -- 2019 XN, 2019 XL, 2019 XD
568^R. Wainscoat on Mauna Kea in Hawaii, 2 in MPECs 2019-X36 & 2019-X41 -- 2019 WM6, 2019 WL6
G96Mt. Lemmon Survey (MLS) in Arizona, 45 in MPECs 2019-X29, 2019-X30, 2019-X31, 2019-X33, 2019-X34, 2019-X35, 2019-X37, 2019-X38, 2019-X39 & 2019-X40 -- 2019 XN, 2019 XM, 2019 XL, 2019 XK, 2019 XH, 2019 XG, 2019 XF, 2019 XD, 2019 XC, 2019 WZ3, 2019 WS4, 2019 WK, 2019 US12, 2019 UO13, 2019 UL13, 2017 XD62, 2017 GG4, 2016 QD, 2014 YW34, 2014 PF68, 2014 FP47, 2011 VR5, 2011 SG16, 2010 WF3, 2008 XC2, 2008 VN, 2006 MX13, 2004 CH52, 2003 SD201, 2000 WP19, 531899, 528859, 511243, 501647, 459046, 430440, 414532, 397471, 338347, 334673, 152978, 138846, 138175, 6239, 3200
Z80Northolt Branch Obs. in England, 4 in MPEC 2019-X31 -- 2019 WR3, 2019 WQ3, 2019 QT8, 2019 OP2
C23Olmen Obs. in Belgium, 1 in MPEC 2019-X31 -- 99248
F51Pan-STARRS 1 (PS1) in Hawaii, 14 in MPECs 2019-X26, 2019-X27, 2019-X28, 2019-X29, 2019-X30, 2019-X31, 2019-X33, 2019-X34, 2019-X35, 2019-X36 & 2019-X41 -- 2019 XH, 2019 XG, 2019 XF, 2019 XD, 2019 XC, 2019 XB, 2019 WM6, 2019 WL6, 2019 WJ6, 2019 WH6, 2019 RN4, 36236, 5620, 5189
F52Pan-STARRS 2 (PS2) in Hawaii, 2 in MPECs 2019-X27 & 2019-X29 -- 2019 XC, 2019 WJ6
K63Pascoli Obs. in Italy, 3 in MPECs 2019-X37, 2019-X38 & 2019-X40 -- 2019 XN, 2019 XL, 2019 XK
B49Paus Obs. in Spain, 1 in MPEC 2019-X31 -- 2019 VL4
H36Sandlot Obs. in Kansas, 2 in MPECs 2019-X37 & 2019-X38 -- 2019 XL, 2019 XK
C95SATINO-1 in France, 1 in MPEC 2019-X31 -- 2019 UE5
291Spacewatch 1.8m telescope in Arizona, 9 in MPECs 2019-X31, 2019-X36 & 2019-X41 -- 2019 WW4, 2019 WS3, 2019 WN, 2019 WM6, 2019 WL6, 2019 WF1, 2019 WC5, 2019 UX13, 2019 MF3
I52Steward Obs. Mt. Lemmon Station in Arizona, 21 in MPECs 2019-X26, 2019-X28, 2019-X30, 2019-X31, 2019-X33, 2019-X34, 2019-X35, 2019-X37, 2019-X38, 2019-X39 & 2019-X40 -- 2019 XN, 2019 XM, 2019 XL, 2019 XK, 2019 XH, 2019 XG, 2019 XF, 2019 XD, 2019 XB, 2019 WT4, 2019 WT3, 2019 WQ3, 2019 WP4, 2019 WH6, 2019 WD1, 2019 VS5, 2019 VP5, 2019 UK13, 2019 UG7, 2016 CQ195, 2014 YW34
T14UH/Tholen NEO Follow-Up CFH Telescope in Hawaii, 1 in MPEC 2019-X32 -- 2002 JZ8
L01Visnjan Obs., 6 in MPECs 2019-X26, 2019-X28, 2019-X37, 2019-X38, 2019-X39 & 2019-X40 -- 2019 XN, 2019 XM, 2019 XL, 2019 XK, 2019 XB, 2019 WH6
C51WISE in Earth polar orbit, 3 in MPEC 2019-X31 -- 2019 UO, 85628, 7088
C42Xingming Obs. in China, 1 in MPEC 2019-X28 -- 2019 XB
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 3 December '19

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 WC5JPL Sentry15352077-210255.16805e-08-6.20-6.390JPL: Computed at 05:47 today Pacific time based on 15 observations spanning 6.7387 days (2019-Nov-26.577514 to 2019-Dec-03.31621). Diameter approximately 0.100 km. from weighted mean H=22.56.
NEODyS15352077-211654.67e-08-6.26-6.280NEODyS: "Based on 15 optical observations (of which 0 are rejected as outliers) from 2019-11-26.578 to 2019-12-03.317."
2019 WW4JPL Sentry15352036-2116211.2550549e-06-3.36-3.730JPL: Computed at 05:47 today Pacific time based on 27 observations spanning 6.1388 days (2019-Nov-27.06455 to 2019-Dec-03.20333). Diameter approximately 0.391 km. from weighted mean H=19.67.
NEODyS15352040-2116429.53e-07-3.50-3.820NEODyS: "Based on 27 optical observations (of which 0 are rejected as outliers) from 2019-11-27.065 to 2019-12-03.204."
2019 WF1JPL Sentry1535R E M O V E DJPL: Risk listing removed at 1326 UTC today
NEODyS1535R E M O V E D-

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 3 December '19

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

2330Grabbed MPEC 2019-X37 - 2019 XK - see above
Grabbed MPEC 2019-X38 - 2019 XL - see above
Grabbed MPEC 2019-X39 - 2019 XM - see above
Grabbed MPEC 2019-X40 - 2019 XN - see above
Grabbed MPEC 2019-X41 - 2019 WM6 - see above
2300Grabbed MPEC 2019-X36 - 2019 WL6 - see above
1844Generated Traffic Report
1535Noted that JPL Sentry has updated its 2019 WC5 risk assessment - see above
Noted that NEODyS has updated its 2019 WC5 risk assessment - see above
Noted that JPL Sentry has removed 2019 WF1 as an impact risk - see above
Noted that NEODyS has removed 2019 WF1 as an impact risk - see above
Noted that JPL Sentry has updated its 2019 WW4 risk assessment - see above
Noted that NEODyS has updated its 2019 WW4 risk assessment - see above
Grabbed MPEC 2019-X26 - 2019 WH6 - see above
Grabbed MPEC 2019-X27 - 2019 WJ6 - see above
Grabbed MPEC 2019-X28 - 2019 XB - see above
Grabbed MPEC 2019-X29 - 2019 XC - see above
Grabbed MPEC 2019-X30 - 2019 XD - see above
Grabbed MPEC 2019-X31 - Daily Orbit Update - see above
Grabbed MPEC 2019-X32 - 2002 JZ8 - see above
Grabbed MPEC 2019-X33 - 2019 XF - see above
Grabbed MPEC 2019-X34 - 2019 XG - see above
Grabbed MPEC 2019-X35 - 2019 XH - see above