Contents  on 2 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 2 December '19

Five objects reported inside ten LD

Five minor (and maybe someday "miner") objects are reported within ten lunar distances (LD) of Earth today. The nearest are 2019 WH2, headed away from 3.70 to 5.04 LD, and 2019 WN1, outbound from 4.3 to 5.0 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  4.91 to 9.03 LD Nov. 28 - tomorrow intruder
3.43 LD yesterday 2019 WH2 15 m  3.70 to 5.04 LD Nov. 27 - Dec. 5 DOU
4.3   LD yesterday* 2019 WN1 17 m  4.3 to 5.0 LD Nov. 27 - Dec. 5 EPU +/- 3.15 hours*
5.81 LD today 2019 WH4 12 m  5.81 LD Nov. 27 - Dec. 6 Earth closest at 0543 UTC - DOU
8.5   LD tomorrow* 2017 AP4 14 m  8.6 from 9.1 LD Nov. 30 - Dec. 7 EPU +/- 2.97 days*
Approaching - sorted by 10-LD bubble entry date
4.8   LD Dec. 9* 2019 WO2 32 m  12.5 from 14.1 LD Dec. 4 - 14 EPU +/- 10 mins.* - DOU
9.8   LD Dec. 9* 2019 WT3 40 m  19.1 from 21.3 LD Dec. 8 - 10 EPU +/- 37 mins.*
6.4   LD Jan. 11* 2019 WC5 109 m  126.6 from 130.3 LD Jan. 9 - 14 EPU +/- 3.13 days*, risk
* EPU = Earth passage uncertainty

This report was generated at 1910 UTC with follow-up in today's DOU MPEC for approaching 2019 WO2, passing risk-listed 2019 WH4, outbound 2019 WH2, and five departed objects: 2019 WU3, 2019 WQ3, 2019 WV, 2019 UO13, and risk-listed 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 2 December '19

The MPC's NEO Confirmation Page has 73 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 73 objects listed. Of these, 58 were "one nighters." So far The Tracking News has counted a total of 110 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 2 December '19

Minor Planet Electronic Circulars

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


MPEC 2019-X25 - "15:10 UT" - 2018 AL13


MPEC 2019-X24 - "14:45 UT" - 2019 WC6


<< DOU on 2 December '19 >>  MPEC 2019-X23 - "12:01 UT" - Daily Orbit Update


MPEC 2019-X22 - "08:09 UT" - 2019 WB6


MPEC 2019-X21 - "08:04 UT" - 2000 LK10


MPEC 2019-X20 - "07:17 UT" - 2019 WA6


MPEC 2019-X19 - "07:15 UT" - 2019 WZ5


MPEC 2019-X18 - "07:13 UT" - 2019 WY5


MPEC 2019-X17 - "07:12 UT" - 2019 WX5


MPEC 2019-X16 - "07:03 UT" - 2019 SJ11


MPEC 2019-X15 - "00:18 UT" - 2019 WO5

Observers  on 2 December '19

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

CodeObserver / observatory
C97Al-Fulaij Obs., 2 in MPEC 2019-X23 -- 2019 WR3, 2019 WQ3
E23Arcadia Obs. in New South Wales, 1 in MPEC 2019-X24 -- 2019 WC6
H21Astronomical Research Obs. Westfield in Illinois, 11 in MPEC 2019-X23 -- 2019 UV11, 2019 UD4, 2019 SB10, 2019 RH1, 2019 RA2, 2019 QZ1, 2016 VO1, 511523, 267940, 254419, 192642
T08ATLAS Mauna Loa in Hawaii, 2 in MPEC 2019-X23 -- 99248, 85236
Z84Calar Alto Schmidt in Spain, 1 in MPEC 2019-X20 -- 2019 WA6
V06Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) in Arizona, 9 in MPECs 2019-X17, 2019-X18, 2019-X21 & 2019-X23 -- 2019 WY5, 2019 WX5, 2019 WU2, 2019 WA3, 2019 SR3, 2016 XT1, 2016 VO1, 2012 US68, 2000 LK10
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 10 in MPECs 2019-X15, 2019-X16, 2019-X19, 2019-X22 & 2019-X23 -- 2019 WZ5, 2019 WO5, 2019 WG4, 2019 WG2, 2019 WB6, 2019 UX13, 2019 UN14, 2019 UJ10, 2019 UA14, 2019 SJ11
157Frasso Sabino Obs. in Italy, 2 in MPEC 2019-X23 -- 2019 QV5, 2019 PR2
X31Galilei Obs., 1 in MPEC 2019-X24 -- 2019 WC6
J95Great Shefford Obs. in England, 8 in MPECs 2019-X15, 2019-X19, 2019-X23 & 2019-X24 -- 2019 WZ5, 2019 WW, 2019 WP4, 2019 WO5, 2019 WM3, 2019 WH4, 2019 WH2, 2019 WC6
K91LCO Sutherland A in South Africa, 1 in MPEC 2019-X23 -- 2019 WH2
568^R. Wainscoat on Mauna Kea in Hawaii, 1 in MPEC 2019-X18 -- 2019 WY5
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPECs 2019-X16 & 2019-X23 -- 2019 SJ11, 2019 KG4
J69North Obs. in England, 2 in MPEC 2019-X23 -- 2019 WR3, 2019 WQ3
J43Oukaimeden Obs. in Morocco, 1 in MPEC 2019-X23 -- 88959
F51Pan-STARRS 1 (PS1) in Hawaii, 10 in MPECs 2019-X15, 2019-X16, 2019-X17, 2019-X18, 2019-X19, 2019-X20, 2019-X21, 2019-X22, 2019-X23 & 2019-X24 -- 2019 WZ5, 2019 WY5, 2019 WX5, 2019 WO5, 2019 WC6, 2019 WB6, 2019 WA6, 2019 SJ11, 2019 KG4, 2000 LK10
F52Pan-STARRS 2 (PS2) in Hawaii, 4 in MPECs 2019-X15, 2019-X16, 2019-X17 & 2019-X22 -- 2019 WX5, 2019 WO5, 2019 WB6, 2019 SJ11
6581Dave Balam via Plaskett 1.8m Telescope in British Columbia, 2 in MPEC 2019-X23 -- 2019 WV4, 2019 WT4
C95SATINO-1 in France, 1 in MPEC 2019-X23 -- 2019 UJ2
033Schwarzschild Obs. in Germany, 1 in MPEC 2019-X23 -- 2019 WT4
I52Steward Obs. Mt. Lemmon Station in Arizona, 34 in MPECs 2019-X16, 2019-X19, 2019-X23 & 2019-X24 -- 2019 WZ5, 2019 WZ3, 2019 WY3, 2019 WY1, 2019 WX4, 2019 WW4, 2019 WW1, 2019 WV4, 2019 WV, 2019 WU4, 2019 WU3, 2019 WT4, 2019 WT, 2019 WS2, 2019 WP4, 2019 WO2, 2019 WM2, 2019 WL4, 2019 WL2, 2019 WG, 2019 WC6, 2019 WC4, 2019 WA2, 2019 VL4, 2019 UO13, 2019 UK13, 2019 UG9, 2019 UG7, 2019 UE5, 2019 SJ11, 2019 SC7, 2019 PQ3, 2015 FE35, 2013 FY13
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2019-X25 -- 2018 AL13
L01Visnjan Obs., 1 in MPEC 2019-X24 -- 2019 WC6
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 2 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 WW4NEODyS16002036-2116461.13e-06-3.47-3.990NEODyS: "Based on 24 optical observations (of which 0 are rejected as outliers) from 2019-11-27.065 to 2019-12-02.101."
JPL Sentry15152033-2116381.9046979e-06-3.19-3.850JPL: Computed at 05:32 today Pacific time based on 24 observations spanning 5.0352 days (2019-Nov-27.06455 to 2019-Dec-02.09976). Diameter approximately 0.362 km. from weighted mean H=19.84.
2019 WH4NEODyS1600R E M O V E D-
2019 WA3NEODyS15332090-211655.77e-07-6.89-7.230NEODyS: "Based on 14 optical observations (of which 1 are rejected as outliers) from 2019-11-25.363 to 2019-12-02.239."
JPL Sentry15152090-211645.5125e-07-6.88-7.220JPL: Computed at 05:32 today Pacific time based on 14 observations spanning 6.8761 days (2019-Nov-25.361902 to 2019-Dec-02.238). Diameter approximately 0.027 km. from weighted mean H=25.50.
2019 WU2NEODyS15332086-2109371.56e-05-4.90-5.110NEODyS: "Based on 16 optical observations (of which 0 are rejected as outliers) from 2019-11-15.332 to 2019-12-02.260."
JPL Sentry15152087-2109211.67024254e-05-4.85-5.050JPL: Computed at 05:50 today Pacific time based on 16 observations spanning 16.927 days (2019-Nov-15.331591 to 2019-Dec-02.25881). Diameter approximately 0.040 km. from weighted mean H=24.65.
2019 WG2NEODyS15332093-21181097.52e-05-4.30-4.980NEODyS: "Based on 34 optical observations (of which 0 are rejected as outliers) from 2019-11-24.496 to 2019-12-01.241."
JPL Sentry15152098-2119550.0002403280106-3.75-3.990JPL: Computed at 05:37 today Pacific time based on 34 observations spanning 6.7448 days (2019-Nov-24.495057 to 2019-Dec-01.23983). Diameter approximately 0.034 km. from weighted mean H=24.99.
2019 WF1NEODyS1533209013.85e-10-6.89-6.890NEODyS: "Based on 29 optical observations (of which 1 are rejected as outliers) from 2019-11-17.210 to 2019-11-30.242."

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 2 December '19

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

1910Generated Traffic Report
1600Noted that NEODyS has removed 2019 WH4 as an impact risk - see above
Noted that NEODyS has updated its 2019 WW4 risk assessment - see above
1533Noted that NEODyS has updated its 2019 WA3 risk assessment - see above
Noted that NEODyS has posted 2019 WF1 as an impact risk - see above
Noted that NEODyS has updated its 2019 WG2 risk assessment - see above
Noted that NEODyS has updated its 2019 WU2 risk assessment - see above
Grabbed MPEC 2019-X25 - 2018 AL13 - see above
1515Noted that JPL Sentry has updated its 2019 WA3 risk assessment - see above
Noted that JPL Sentry has updated its 2019 WG2 risk assessment - see above
Noted that JPL Sentry has updated its 2019 WU2 risk assessment - see above
Noted that JPL Sentry has updated its 2019 WW4 risk assessment - see above
Grabbed MPEC 2019-X16 - 2019 SJ11 - see above
Grabbed MPEC 2019-X17 - 2019 WX5 - see above
Grabbed MPEC 2019-X18 - 2019 WY5 - see above
Grabbed MPEC 2019-X19 - 2019 WZ5 - see above
Grabbed MPEC 2019-X20 - 2019 WA6 - see above
Grabbed MPEC 2019-X21 - 2000 LK10 - see above
Grabbed MPEC 2019-X22 - 2019 WB6 - see above
Grabbed MPEC 2019-X23 - Daily Orbit Update - see above
Grabbed MPEC 2019-X24 - 2019 WC6 - see above
0415Grabbed MPEC 2019-X15 - 2019 WO5 - see above