Contents  on 1 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 1 December '19

Five objects reported inside ten LD

There are five asteroidal objects reported inside ten lunar distances (LD) of Earth today. Closest is intruder 2019 WJ4, which starts the day within one LD of the Moon while moving out from 1.09 to 4.91 LD from our planet.

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  1.09 to 4.91 LD Nov. 28 - Dec. 3 intruder, exits Earth SOI - DOU
3.43 LD today 2019 WH2 14 m  3.43 LD Nov. 27 - Dec. 5 Earth closest at 0914 UTC - DOU
4.3   LD today* 2019 WN1 17 m  4.3 LD Nov. 27 - Dec. 5 EPU +/- 3.15 hours*, Earth closest at 2113 UTC
5.82 LD tomorrow 2019 WH4 13 m  5.83 from 6.24 LD Nov. 27 - Dec. 6 risk
8.5   LD Dec. 3* 2017 AP4 14 m  9.1 from 9.8 LD Nov. 30 - Dec. 7 EPU +/- 2.97 days*
Approaching - sorted by 10-LD bubble entry date
4.8   LD Dec. 9* 2019 WO2 31 m  14.1 from 15.7 LD Dec. 4 - 14 EPU +/- 4.60 hours*
9.8   LD Dec. 9* 2019 WT3 40 m  21.3 from 23.5 LD Dec. 8 - 10 EPU +/- 37 mins.*
6.4   LD Jan. 11* 2019 WC5 109 m  130.3 from 134.1 LD Jan. 9 - 14 NEW, EPU +/- 3.13 days*, risk - MPEC
* EPU = Earth passage uncertainty

This report was generated at 1840 UTC with the discovery of approaching largish and risk-listed 2019 WC5 (MPEC), and with follow-up in today's DOU MPEC for passing 2019 WH2, outbound 2019 WJ4, and departed objects 2019 WQ3 and risk-listed 2019 WU, plus astrometry from October for 2019 UE1.



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 1 December '19

The MPC's NEO Confirmation Page has 53 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 53 objects listed. Of these, 29 were "one nighters." So far The Tracking News has counted a total of 79 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 1 December '19

Minor Planet Electronic Circulars

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


MPEC 2019-X14 - "23:01 UT" - 2019 WL5


MPEC 2019-X13 - "22:59 UT" - 2015 NV28


MPEC 2019-X12 - "20:00 UT" - 2019 WK5


MPEC 2019-X11 - "19:58 UT" - 2019 WJ5


MPEC 2019-X10 - "19:54 UT" - 2019 VG6


MPEC 2019-X09 - "16:38 UT" - 2019 WE5


MPEC 2019-X08 - "15:41 UT" - 2019 WD5


MPEC 2019-X07 - "15:23 UT" - 2008 WZ94


<< DOU on 1 December '19 >>  MPEC 2019-X06 - "12:01 UT" - Daily Orbit Update


MPEC 2019-X05 - "05:37 UT" - 2019 WC5


MPEC 2019-X04 - "04:37 UT" - 2019 WB5


MPEC 2019-X03 - "03:18 UT" - 2019 WX4


MPEC 2019-X02 - "00:04 UT" - 2019 WW4


MPEC 2019-X01 - "00:02 UT" - 2019 WV4

Observers  on 1 December '19

A total of 32 observers appear in today's MPECs.

CodeObserver / observatory
C97Al-Fulaij Obs., 11 in MPEC 2019-X06 -- 2019 WR3, 2019 WQ3, 99248, 66146, 18172, 162723, 137084, 9400, 6455, 2059, 1620
H21Astronomical Research Obs. Westfield in Illinois, 2 in MPECs 2019-X08 & 2019-X11 -- 2019 WJ5, 2019 WD5
T05ATLAS Haleakala in Hawaii, 13 in MPEC 2019-X06 -- 2015 JD1, 87684, 86326, 66146, 53110, 489486, 458732, 162181, 162082, 153842, 7092, 5131, 2059
T08ATLAS Mauna Loa in Hawaii, 10 in MPEC 2019-X06 -- 2006 KF89, 36236, 340666, 333555, 243025, 214088, 162004, 153814, 137052, 3200
B59Borken Obs. in Germany, 1 in MPEC 2019-X06 -- 99248
160Castelmartini Obs. in Italy, 2 in MPEC 2019-X06 -- 2019 UB11, 514041
V06Catalina Sky Survey Kuiper Telescope in Arizona, 1 in MPEC 2019-X11 -- 2019 WJ5
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 22 in MPECs 2019-X02, 2019-X03, 2019-X04, 2019-X05, 2019-X06, 2019-X09, 2019-X11, 2019-X12, 2019-X13 & 2019-X14 -- 2019 WX4, 2019 WX1, 2019 WW4, 2019 WV3, 2019 WU, 2019 WR4, 2019 WL5, 2019 WK5, 2019 WJ5, 2019 WH1, 2019 WE5, 2019 WC5, 2019 WB5, 2019 VL3, 2019 VD6, 2019 VD1, 2019 UX13, 2019 UH2, 2019 UA14, 2019 FS, 2015 NV28, 2009 HY51
K87Dettelbach Vineyard Obs. in Germany, 12 in MPEC 2019-X06 -- 2019 WZ, 2019 WW, 2019 WR3, 2019 WQ3, 2019 UO, 2019 UL13, 2019 UK6, 2019 UJ15, 2019 UB11, 2019 QV5, 2019 OP2, 9400
595Farra d'Isonzo Obs. in Italy, 4 in MPEC 2019-X06 -- 2019 WR3, 2019 WJ4, 2019 UO, 216258
J95Great Shefford Obs. in England, 5 in MPECs 2019-X02 & 2019-X06 -- 2019 WW4, 2019 WQ3, 2019 WH2, 2019 WD3, 2019 UX9
A17Guidestar Obs. in Germany, 3 in MPEC 2019-X06 -- 2019 VL4, 2019 UK6, 2008 XC2
H01Magdalena Ridge Obs. (MRO) in New Mexico, 2 in MPECs 2019-X10 & 2019-X11 -- 2019 WJ5, 2019 VG6
568^R. Wainscoat on Mauna Kea in Hawaii, 4 in MPECs 2019-X04, 2019-X08, 2019-X12 & 2019-X14 -- 2019 WL5, 2019 WK5, 2019 WD5, 2019 WB5
G96Mt. Lemmon Survey (MLS) in Arizona, 4 in MPECs 2019-X02, 2019-X10, 2019-X11 & 2019-X13 -- 2019 WW4, 2019 WJ5, 2019 VG6, 2015 NV28
C47Nonndorf Obs. in Austria, 1 in MPEC 2019-X06 -- 2019 WQ3
Z80Northolt Branch Obs. in England, 1 in MPEC 2019-X06 -- 2019 WQ3
J43Oukaimeden Obs. in Morocco, 3 in MPEC 2019-X06 -- 2019 UG7, 2006 TD1, 90075
F51Pan-STARRS 1 (PS1) in Hawaii, 12 in MPECs 2019-X01, 2019-X02, 2019-X03, 2019-X04, 2019-X05, 2019-X06, 2019-X08, 2019-X09, 2019-X10, 2019-X12, 2019-X13 & 2019-X14 -- 2019 WX4, 2019 WW4, 2019 WV4, 2019 WL5, 2019 WK5, 2019 WE5, 2019 WD5, 2019 WC5, 2019 WB5, 2019 VG6, 2019 SM, 2015 NV28
F52Pan-STARRS 2 (PS2) in Hawaii, 5 in MPECs 2019-X06, 2019-X13 & 2019-X14 -- 2019 WL5, 2016 UT80, 2015 NV28, 506074, 106589
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 7 in MPEC 2019-X06 -- 2019 WR2, 2019 WQ3, 2019 SH6, 2019 QV5, 2019 PR2, 2011 YS62, 99248
6581Dave Balam via Plaskett 1.8m Telescope in British Columbia, 2 in MPECs 2019-X01 & 2019-X02 -- 2019 WW4, 2019 WV4
654Pomona College Table Mtn. Obs. in southern California, 1 in MPEC 2019-X06 -- 2019 UB11
C95SATINO-1 in France, 1 in MPEC 2019-X06 -- 2019 UE1
033Schwarzschild Obs. in Germany, 2 in MPECs 2019-X06 & 2019-X08 -- 2019 WD5, 2016 WE1
G40*program code "*" (19) via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2019-X06 -- 2019 WR3
G40-program code "-" (22) via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2019-X06 -- 2019 WT4
587Sormano Obs. in Italy, 1 in MPEC 2019-X06 -- 448724
I52Steward Obs. Mt. Lemmon Station in Arizona, 2 in MPECs 2019-X10 & 2019-X11 -- 2019 WJ5, 2019 VG6
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2019-X06 -- 2019 WU2, 2019 QF2
T14UH/Tholen NEO Follow-Up CFH Telescope in Hawaii, 1 in MPEC 2019-X07 -- 2008 WZ94
L01Visnjan Obs., 3 in MPECs 2019-X01, 2019-X02 & 2019-X03 -- 2019 WX4, 2019 WW4, 2019 WV4
G33Wickede Obs. in Germany, 1 in MPEC 2019-X06 -- 2019 WQ3
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 1 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 Sentry15452023-21171702.5315917e-06-3.58-3.670JPL: Computed at 23:07 Nov. 30th Pacific time based on 12 observations spanning 2.9129 days (2019-Nov-26.577514 to 2019-Nov-29.490403). Diameter approximately 0.109 km. from weighted mean H=22.48.
NEODyS15452023-2108321.08e-06-3.74-3.790NEODyS: "Based on 12 optical observations (of which 0 are rejected as outliers) from 2019-11-26.578 to 2019-11-29.491."
2019 WW4NEODyS15452022-2117892.84e-06-2.86-3.530NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2019-11-27.065 to 2019-11-30.729."
JPL Sentry04112022-21191132.9763848e-06-2.77-3.560JPL: Computed at 17:33 Nov. 30th Pacific time based on 20 observations spanning 3.6640 days (2019-Nov-27.06455 to 2019-Nov-30.728586). Diameter approximately 0.391 km. from weighted mean H=19.68.
2019 WU2JPL Sentry15452087-2108241.8423024e-05-4.79-5.050JPL: Computed at 05:31 today Pacific time based on 12 observations spanning 12.988 days (2019-Nov-15.331591 to 2019-Nov-28.319652). Diameter approximately 0.041 km. from weighted mean H=24.60.
NEODyS15452086-2109462.09e-05-4.75-5.160NEODyS: "Based on 12 optical observations (of which 0 are rejected as outliers) from 2019-11-15.332 to 2019-11-28.320."
2019 WUJPL Sentry15452058-2112101.637287e-06-7.05-7.580JPL: Computed at 05:29 today Pacific time based on 29 observations spanning 9.2767 days (2019-Nov-19.34099 to 2019-Nov-28.617697). Diameter approximately 0.013 km. from weighted mean H=27.04.
NEODyS15452069-2112108.31e-07-7.39-7.610NEODyS: "Based on 29 optical observations (of which 0 are rejected as outliers) from 2019-11-19.342 to 2019-11-28.618."
2019 VG6JPL Sentry22082025-2115792.80493e-08-5.40-6.030JPL: Computed at 13:25 today Pacific time based on 16 observations spanning 1.2988 days (2019-Nov-04.19153 to 2019-Nov-05.49028). Diameter approximately 0.209 km. from weighted mean H=21.05.
NEODyS22082025-2114596.11e-09-6.00-6.330NEODyS: "Based on 16 optical observations (of which 0 are rejected as outliers) from 2019-11-04.192 to 2019-11-05.491."

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 1 December '19

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

2304Grabbed MPEC 2019-X13 - 2015 NV28 - see above
Grabbed MPEC 2019-X14 - 2019 WL5 - see above
2208Noted that JPL Sentry has posted 2019 VG6 as an impact risk - see above
Noted that NEODyS has posted 2019 VG6 as an impact risk - see above
2100Grabbed MPEC 2019-X10 - 2019 VG6 - see above
Grabbed MPEC 2019-X11 - 2019 WJ5 - see above
Grabbed MPEC 2019-X12 - 2019 WK5 - see above
1840Generated Traffic Report
1701Grabbed MPEC 2019-X09 - 2019 WE5 - see above
1545Noted that JPL Sentry has posted 2019 WC5 as an impact risk - see above
Noted that NEODyS has posted 2019 WC5 as an impact risk - see above
Noted that JPL Sentry has updated its 2019 WU risk assessment - see above
Noted that NEODyS has updated its 2019 WU risk assessment - see above
Noted that JPL Sentry has updated its 2019 WU2 risk assessment - see above
Noted that NEODyS has updated its 2019 WU2 risk assessment - see above
Noted that NEODyS has posted 2019 WW4 as an impact risk - see above
Grabbed MPEC 2019-X05 - 2019 WC5 - see above
Grabbed MPEC 2019-X06 - Daily Orbit Update - see above
Grabbed MPEC 2019-X07 - 2008 WZ94 - see above
Grabbed MPEC 2019-X08 - 2019 WD5 - see above
0517Grabbed MPEC 2019-X04 - 2019 WB5 - see above
0411Noted that JPL Sentry has posted 2019 WW4 as an impact risk - see above
Grabbed MPEC 2019-X03 - 2019 WX4 - see above
0009Grabbed MPEC 2019-X01 - 2019 WV4 - see above
Grabbed MPEC 2019-X02 - 2019 WW4 - see above