Contents  on 5 January '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 5 January '19

Ten objects reported inside ten LD

There are ten asteroidal objects reported within ten lunar distances (LD) of our home world today. Nearest is risk-listed 2019 AB, which leaves Earth's sphere of gravitational influence as it moves away from 1.85 to 3.65 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
0.51 LD Dec. 28 2018 YO2 4 m  6.79 to 7.66 LD Dec. 16 - Jan. 8 intruder, NHATS target, risk
1.43 LD yesterday 2019 AB 19 m  1.85 to 3.65 LD Dec. 30 - Jan. 8 Moon buzzer, exits Earth SOI, risk
3.0   LD Jan. 10* 2019 AD 10 m  6.2 from 7.4 LD Jan. 2 - 18 EPU +/- 1.15 hours*, NHATS target
3.92 LD Dec. 2 2018 TG6 12 m  9.98 to 10.21 LD Oct. 30 - today NHATS target, exits ten LD
5.60 LD Jan. 12 2018 YU2 17 m  8.46 from 9.27 LD yesterday - Jan. 20 NHATS target
7.47 LD Jan. 10 2018 YQ2 20 m  9.03 from 9.80 LD yesterday - Jan. 15 NHATS target, risk
7.76 LD Jan. 10 2013 YM2 19 m  8.69 from 9.16 LD Jan. 3 - 16 NHATS target - MPEC
7.8   LD today* 2019 AU 16 m  7.8 LD Dec. 27 - Jan. 14 EPU +/- 41 mins.*, NHATS target, Earth closest at 2110 UTC - DOU
7.8   LD tomorrow* 2018 XO4 30 m  7.9 from 8.0 LD Dec. 30 - Jan. 13 EPU +/- 17 mins.*, NHATS target
9.05 LD today 2018 YR2 17 m  9.05 LD Jan. 1 - 8 NHATS target, Earth closest at 0501 UTC
* EPU = Earth passage uncertainty

This report was generated at 2110 UTC with the recovery of inbound 2013 YM2 (MPEC) and with follow-up in today's DOU MPEC for passing 2019 AU and for eight departed objects: 2019 AT, 2018 YM2, 2018 YK2, 2018 YA1, 2018 XN5, and including risk-listed 2018 XW3, 2018 XX2, and 2018 XF2, plus radar astrometry posted today and yesterday from October-November observation of 2018 WD, 2018 TF3, and 475534 2006 TS7.



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.

Radar Astrometry  on 5 January '19

Radar observation of three objects

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:


Data update noted at 0021 UTC when the database was dated 4 Jan.


Data update noted at 0100 UTC when the database was dated 4 Jan.



Photometry and some astrometry is needed for upcoming radar targets. See Arecibo and Goldstone schedules.

NEOCP Activity  on 5 January '19

The MPC's NEO Confirmation Page has 99 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 99 objects listed. Of these, eighteen were "one nighters." So far The Tracking News has counted a total of 142 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 5 January '19

Minor Planet Electronic Circulars

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


<< DOU on 5 Jan. '19 >>  MPEC 2019-A52 - "13:10 UT" - Daily Orbit Update


MPEC 2019-A51 - "03:48 UT" - 2013 YM2


MPEC 2019-A50 - "01:12 UT" - 2019 AY


MPEC 2019-A49 - "01:08 UT" - 2019 AX


MPEC 2019-A48 - "01:04 UT" - 2019 AW


MPEC 2019-A47 - "00:59 UT" - 2019 AV

Observers  on 5 January '19

A total of 24 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 1 in MPEC 2019-A50 -- 2019 AY
T05ATLAS Haleakala in Hawaii, 4 in MPEC 2019-A52 -- 2018 XV, 2018 XB2, 2009 SV17, 2007 YU56
T08ATLAS Mauna Loa in Hawaii, 2 in MPEC 2019-A52 -- 523811, 2340
160Castelmartini Obs. in Italy, 4 in MPEC 2019-A52 -- 2018 XB2, 2018 WR1, 4401, 1916
703Catalina Sky Survey (CSS) in Arizona, 2 in MPECs 2019-A51 & 2019-A52 -- 2014 XR6, 2013 YM2
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 3 in MPECs 2019-A49 & 2019-A52 -- 2019 AX, 2019 AT, 2018 SZ
K88GINOP-KHK in Hungary, 1 in MPEC 2019-A49 -- 2019 AX
253Goldstone DSS-14 70m antenna in southern California, 3 in radar -- 2018 WD, 2018 TF3, 2002 VE68
Z22MASTER IAC Obs. in the Canary Islands, 1 in MPEC 2019-A52 -- 1943
568^R. Wainscoat on Mauna Kea in Hawaii, 9 in MPECs 2019-A47, 2019-A48, 2019-A49, 2019-A50 & 2019-A52 -- 2019 AY, 2019 AX, 2019 AW, 2019 AV, 2019 AU, 2019 AR, 2019 AN, 2019 AL, 2014 YM44
474Mt. John Obs. in New Zealand, 5 in MPECs 2019-A49 & 2019-A52 -- 2019 AX, 2018 YU, 2018 YM2, 2018 YB1, 2018 XN5
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2019-A51 -- 2013 YM2
I41Palomar Transient Factory (PTF) in southern California, 29 in MPEC 2019-A52 -- 2018 VZ9, 2014 XR6, 2013 VD13, 89355, 85804, 66251, 523824, 523823, 523811, 455736, 443103, 419829, 410088, 385268, 380476, 345705, 31345, 217628, 215188, 20790, 186822, 138524, 137805, 5797, 3552, 2100, 1866, 1627, 719
F51Pan-STARRS 1 (PS1) in Hawaii, 18 in MPECs 2019-A47, 2019-A48, 2019-A49, 2019-A50 & 2019-A52 -- 2019 AY, 2019 AX, 2019 AW, 2019 AV, 2019 AT, 2018 YW2, 2018 YT2, 2018 YK2, 2018 YB1, 2018 XD2, 2018 VB9, 2017 BP5, 2016 OP5, 2015 YU7, 2015 XA352, 459462, 234145, 138175
B49Paus Obs. in Spain, 1 in MPEC 2019-A52 -- 2018 XB2
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2019-A51 -- 2013 YM2
C95SATINO-1 in France, 1 in MPEC 2019-A52 -- 18736
G403Tony Evans in Portugal via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2019-A52 -- 2018 VZ9
587Sormano Obs. in Italy, 1 in MPEC 2019-A52 -- 2019 AC
691Spacewatch 0.9m telescope in Arizona, 6 in MPEC 2019-A52 -- 2018 YA1, 2018 XV5, 2018 VC5, 2018 TX4, 2017 BP5, 2006 OT9
291Spacewatch 1.8m telescope in Arizona, 6 in MPECs 2019-A47 & 2019-A52 -- 2019 AV, 2018 YZ, 2018 XE5, 2018 WP2, 2018 VT3, 2018 RP8
I52Steward Obs. Mt. Lemmon Station in Arizona, 10 in MPEC 2019-A52 -- 2018 YV, 2018 YL, 2018 YK2, 2018 YJ2, 2018 YH, 2018 XZ1, 2018 XU6, 2018 WN2, 2016 BA40, 2015 BY310
C57TESS in Earth orbit, 4 in MPEC 2019-A52 -- 99799, 89959, 54789, 410088
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 5 in MPEC 2019-A52 -- 2018 XX2, 2018 XW3, 2018 XF2, 2018 TO1, 2015 BG4
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 5 January '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
2018 YW2JPL Sentry17202050-208132.586e-06-5.19-5.530JPL: Computed at 08:18 today Pacific time based on 19 observations spanning 4.1281 days (2018-Dec-31.52399 to 2019-Jan-04.65212). Diameter approximately 0.055 km. from weighted mean H=23.97.
2018 XW3JPL Sentry17202044-204411.234e-07-7.26-7.260JPL: Computed at 08:13 today Pacific time based on 25 observations spanning 21.160 days (2018-Dec-13.2296 to 2019-Jan-03.389707). Diameter approximately 0.018 km. from weighted mean H=26.35.
2018 XX2JPL Sentry17202106-210922.6254e-07-7.30-7.470JPL: Computed at 08:11 today Pacific time based on 43 observations spanning 23.956 days (2018-Dec-10.53786 to 2019-Jan-03.49352). Diameter approximately 0.022 km. from weighted mean H=25.97.
2018 XF2JPL Sentry17202104-210419.590e-08-7.91-7.910JPL: Computed at 08:08 today Pacific time based on 66 observations spanning 24.252 days (2018-Dec-10.26869 to 2019-Jan-03.521031). Diameter approximately 0.019 km. from weighted mean H=26.25.

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 5 January '19

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

2110Generated Traffic Report
1720Noted that JPL Sentry has updated its 2018 XF2 risk assessment - see above
Noted that JPL Sentry has updated its 2018 XW3 risk assessment - see above
Noted that JPL Sentry has updated its 2018 XX2 risk assessment - see above
Noted that JPL Sentry has updated its 2018 YW2 risk assessment - see above
Grabbed MPEC 2019-A52 - Daily Orbit Update - see above
0451Grabbed MPEC 2019-A51 - 2013 YM2 - see above
0128Grabbed MPEC 2019-A47 - 2019 AV - see above
Grabbed MPEC 2019-A48 - 2019 AW - see above
Grabbed MPEC 2019-A49 - 2019 AX - see above
Grabbed MPEC 2019-A50 - 2019 AY - see above
0100Noted Radar Astrometry database update - see above
0021Noted Radar Astrometry database update - see above