Contents  on 28 November '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 28 November '19

Three objects reported inside ten LD

There are three asteroidal objects reported within ten lunar distances (LD) of our home world today. The closest, 2019 WH2, is inbound from about 8.5 to 6.4 LD*.

Neighborhood Traffic - sorted by Earth passage distance, grouped by 2.41, 5.0 & 10.0 LD boundaries
Earth passage I D ~Size Distance today  Inside ten LD Notes
3.4   LD Dec. 1* 2019 WH2 14 m  6.4 from 8.5 LD yesterday - Dec. 5 EPU +/- 13 mins.*
4.3   LD Dec. 1* 2019 WN1 17 m  7.8 from 9.8 LD yesterday - Dec. 5 EPU +/- 3.15 hours*
7.9   LD Nov. 21* 2019 WN2 10 m  9.3 to 9.6 LD Nov. 13 - 29 EPU +/- 1.63 hours*, NHATS target
Approaching - sorted by 10-LD bubble entry date
8.5   LD Dec. 3* 2017 AP4 14 m  11.8 from 13.0 LD Nov. 30 - Dec. 7 EPU +/- 2.97 days*
4.8   LD Dec. 9* 2019 WO2 31 m  19.0 from 20.7 LD Dec. 4 - 14 EPU +/- 4.60 hours*
* EPU = Earth passage uncertainty

This report was generated at 1920 UTC with the discovery announced late yesterday of already departed 2019 WZ2 (MPEC), which flew by us at 8.83 LD on November 21st, and from today departed 2019 WG3 (MPEC), which passed by at 9.74 LD on the 12th. Today's DOU MPEC has follow-up for three departed objects: 2019 VK and two risk-listed -- 2019 WV1 and intruder 2019 WG2.



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 28 November '19

The MPC's NEO Confirmation Page has 100 listings

When last checked at 2301 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 100 objects listed. Of these, 63 were "one nighters." So far The Tracking News has counted a total of 105 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 28 November '19

Minor Planet Electronic Circulars

As of last check at 2301 UTC, there have been five MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2019-W164 - "16:44 UT" - 2019 WG3


<< DOU on 28 November '19 >>  MPEC 2019-W163 - "14:52 UT" - Daily Orbit Update


MPEC 2019-W162 - "09:04 UT" - 2019 WF3


MPEC 2019-W161 - "08:49 UT" - 2019 WE3


MPEC 2019-W160 - "00:49 UT" - 2019 WD3

Observers  on 28 November '19

Nineteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 1 in MPEC 2019-W162 -- 2019 WF3
T05ATLAS Haleakala in Hawaii, 18 in MPEC 2019-W163 -- 87311, 492143, 415711, 354030, 25330, 252399, 18882, 153842, 138852, 137199, 11405, 7092, 5626, 4954, 4486, 4183, 3691, 2059
T08ATLAS Mauna Loa in Hawaii, 15 in MPEC 2019-W163 -- 2015 WH13, 2014 AD17, 99248, 448818, 442243, 338347, 323179, 238063, 18172, 163696, 162723, 138846, 137084, 6455, 1866
Z84Calar Alto Schmidt in Spain, 1 in MPEC 2019-W161 -- 2019 WE3
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 10 in MPEC 2019-W163 -- 2019 WH1, 2019 VY2, 2019 VD1, 2019 UQ12, 2019 UM6, 2019 UH2, 2019 UC10, 2019 TQ4, 2019 SN10, 2019 SK10
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 2 in MPECs 2019-W161 & 2019-W162 -- 2019 WF3, 2019 WE3
006Fabra Obs. in Spain, 1 in MPEC 2019-W163 -- 99248
E89Geyserland Obs. in New Zealand, 4 in MPEC 2019-W163 -- 36236, 153842, 3102, 2100
711McDonald Obs. in Texas, 1 in MPEC 2019-W162 -- 2019 WF3
474Mt. John Obs. in New Zealand, 4 in MPEC 2019-W163 -- 2019 WW1, 2019 VT2, 2019 TL4, 2019 OL1
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPECs 2019-W162 & 2019-W164 -- 2019 WG3, 2019 WF3
F51Pan-STARRS 1 (PS1) in Hawaii, 38 in MPECs 2019-W160, 2019-W161, 2019-W163 & 2019-W164 -- 2019 WG3, 2019 WE3, 2019 WD3, 2019 UX13, 2019 UV8, 2019 UN14, 2019 TK3, 2019 TE8, 2019 SA10, 2019 RU, 2019 OV2, 2017 XG62, 2016 WJ1, 2015 VU142, 2012 VK76, 2009 HY51, 2008 WL60, 2006 TD1, 2005 XP66, 2005 GK, 1998 US18, 85839, 534676, 481985, 447795, 438908, 363814, 328059, 25330, 252373, 223456, 217430, 170903, 154988, 152679, 141018, 5620, 2059
F52Pan-STARRS 2 (PS2) in Hawaii, 14 in MPECs 2019-W160 & 2019-W163 -- 2019 WD3, 2019 MV3, 2016 TR54, 2016 JN24, 2006 KF89, 2004 CH52, 1998 SE35, 501647, 348595, 174806, 162162, 153842, 108906, 3552
C95SATINO-1 in France, 1 in MPEC 2019-W163 -- 2019 TQ4
033Schwarzschild Obs. in Germany, 1 in MPEC 2019-W160 -- 2019 WD3
A16Tentlingen Obs. in Switzerland, 1 in MPEC 2019-W163 -- 9400
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 3 in MPEC 2019-W163 -- 2019 WV1, 2019 WG2, 2019 VK
L01Visnjan Obs., 1 in MPEC 2019-W162 -- 2019 WF3
I41Zwicky Transient Facility (ZTF) in southern California, 7 in MPEC 2019-W163 -- 2019 TH6, 2019 LE5, 2015 NW9, 85839, 442243, 326777, 18172
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 28 November '19

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2302 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 WF3JPL Sentry15352091-211021.0335e-09-6.88-7.020JPL: Computed at 02:28 today Pacific time based on 20 observations spanning 1.9613 days (2019-Nov-25.27496 to 2019-Nov-27.23624). Diameter approximately 0.296 km. from weighted mean H=20.30.
2019 WA3NEODyS15352026-21182431.92e-05-5.23-6.180NEODyS: "Based on 9 optical observations (of which 0 are rejected as outliers) from 2019-11-25.363 to 2019-11-27.171."
JPL Sentry01022026-21193452.0011204e-05-5.22-6.250JPL: Computed at 16:16 Nov. 27th Pacific time based on 9 observations spanning 1.8082 days (2019-Nov-25.361902 to 2019-Nov-27.17014). Diameter approximately 0.028 km. from weighted mean H=25.44.
2019 WG2NEODyS19042093-21181097.38e-05-4.31-4.940NEODyS: "Based on 31 optical observations (of which 0 are rejected as outliers) from 2019-11-24.496 to 2019-11-27.444."
JPL Sentry17502098-2119560.0002478145427-3.74-3.980JPL #2 for the day: Computed at 08:39 today Pacific time based on 31 observations spanning 2.9479 days (2019-Nov-24.495057 to 2019-Nov-27.442969). Diameter approximately 0.034 km. from weighted mean H=24.99.
2019 WV1NEODyS19042078-2117348.24e-06-6.86-7.430NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2019-11-24.614 to 2019-11-27.368."
JPL Sentry17502078-2117199.3139177e-06-6.78-7.240JPL #2 for the day: Computed at 08:37 today Pacific time based on 20 observations spanning 2.7546 days (2019-Nov-24.61277 to 2019-Nov-27.367361). Diameter approximately 0.008 km. from weighted mean H=28.17.

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 28 November '19

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

1920Generated Traffic Report
1904Noted that NEODyS has updated its 2019 WG2 risk assessment - see above
Noted that NEODyS has updated its 2019 WV1 risk assessment - see above
1750Noted that JPL Sentry has updated its 2019 WG2 risk assessment - see above
Noted that JPL Sentry has updated its 2019 WV1 risk assessment - see above
Grabbed MPEC 2019-W164 - 2019 WG3 - see above
1535Noted that NEODyS has posted 2019 WA3 as an impact risk - see above
Noted that JPL Sentry has posted 2019 WF3 as an impact risk - see above
Grabbed MPEC 2019-W161 - 2019 WE3 - see above
Grabbed MPEC 2019-W162 - 2019 WF3 - see above
Grabbed MPEC 2019-W163 - Daily Orbit Update - see above
0430Noted that JPL Sentry has updated its 2019 WG2 risk assessment - see above
0102Noted that JPL Sentry has posted 2019 WA3 as an impact risk - see above
Noted that JPL Sentry has updated its 2019 WV1 risk assessment - see above
Grabbed MPEC 2019-W160 - 2019 WD3 - see above