Contents  on 30 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 30 January '19

Twelve objects reported inside ten LD

There are twelve transient natural objects reported less than ten lunar distances (LD) from Earth today. Newly announced 2019 BL4 is the nearest and comes its closest to our planet on this passage, reaching 2.57 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
0.13 LD Jan. 27 2019 BZ3 6 m  4.86 to 7.25 LD Jan. 23 - Feb. 1 intruder, risk
1.6   LD Feb. 2* 2019 BR3 9 m  6.0 from 8.2 LD yesterday - Feb. 6 EPU +/- 10 mins.*, NHATS target
1.71 LD Jan. 28 2019 BR2 8 m  5.48 to 8.32 LD Jan. 24 - 31
2.57 LD today 2019 BL4 9 m  2.57 LD Jan. 26 - Feb. 3 NEW, Earth closest at 0506 UTC - MPEC, DOU
3.13 LD Jan. 26 2019 BU3 5 m  4.90 to 5.73 LD Jan. 16 - Feb. 4 NHATS target, risk - DOU
3.28 LD Jan. 27 2019 BQ2 14 m  7.31 to 10.07 LD Jan. 24 - 30 exits ten LD
3.36 LD yesterday 2019 BG3 20 m  6.74 to 12.63 LD Jan. 27 - 30 exits ten LD
3.42 LD today 2019 BJ1 37 m  3.42 LD Jan. 28 - Feb. 2 Earth closest at 1840 UTC
4.76 LD Jan. 27 2019 BS2 12 m  6.77 to 8.54 LD Jan. 24 - 31
5.00 LD yesterday 2019 BY3 11 m  5.02 to 5.55 LD Jan. 25 - Feb. 3
6.96 LD Jan. 23 2019 AS11 15 m  9.65 to 10.33 LD Jan. 15 - 30 NHATS target, exits ten LD
9.11 LD Jan. 28 2019 BV2 29 m  9.81 to 11.44 LD Jan. 27 - 30 exits ten LD, risk
* EPU = Earth passage uncertainty

This report was generated at 1920 UTC with the discoveries of passing 2019 BL4 (MPEC, DOU) and approaching 2019 BK4 (MPEC), and with follow-up in today's DOU MPEC for outbound 2019 BU3 and departed risk-listed 2018 XX2.

Approaching - sorted by 10-LD bubble entry date
4.1   LD Feb. 6* 2019 BK4 13 m  13.2 from 15.2 LD Feb. 1 - 10 NEW, EPU +/- 2.32 hours*, NHATS target - MPEC
7.3   LD Feb. 12* 2017 PV25 41 m  18.9 from 20.2 LD Feb. 7 - 17 EPU +/- 1.07 hours*, NHATS target



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 30 January '19

The MPC's NEO Confirmation Page has 61 listings

When last checked at 2330 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 61 objects listed. Of these, 41 were "one nighters." So far The Tracking News has counted a total of 72 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 30 January '19

Minor Planet Electronic Circulars

As of last check at 2330 UTC, there have been nine MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


<< DOU on 30 Jan. '19 >>  MPEC 2019-B152 - "13:12 UT" - Daily Orbit Update


MPEC 2019-B151 - "12:29 UT" - 2015 WH13


MPEC 2019-B150 - "12:26 UT" - 2012 VK76


MPEC 2019-B149 - "05:04 UT" - 2019 BH4


MPEC 2019-B148 - "05:00 UT" - 2019 BL4


MPEC 2019-B147 - "04:56 UT" - 2019 BK4


MPEC 2019-B146 - "04:52 UT" - 2019 BJ4


MPEC 2019-B145 - "04:48 UT" - 2019 BG4


MPEC 2019-B144 - "04:43 UT" - 2019 BF4

Observers  on 30 January '19

A total of 22 observers appear in today's MPECs.

CodeObserver / observatory
160Castelmartini Obs. in Italy, 3 in MPEC 2019-B152 -- 410088, 381677, 275611
V06Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) in Arizona, 2 in MPECs 2019-B145 & 2019-B152 -- 2019 BG4, 2018 XL5
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 16 in MPECs 2019-B145, 2019-B149, 2019-B150 & 2019-B152 -- 2019 BV3, 2019 BH4, 2019 BG4, 2019 BG, 2019 BF, 2019 AJ3, 2019 AF12, 2019 AB3, 2019 AA14, 2018 YV, 2018 YF2, 2018 RV5, 2018 RB8, 2018 PQ23, 2018 NT2, 2012 VK76
J95Great Shefford Obs. in England, 1 in MPECs 2019-B148 & 2019-B152 -- 2019 BL4
P93JAXA Space Tracking & Communications Center in Japan, 1 in MPEC 2019-B152 -- 2019 BL4
695^Spacewatch via Kitt Peak Natl. Obs. in Arizona, 1 in MPEC 2019-B152 -- 2018 XH
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2019-B148 -- 2019 BL4
D54MASTER-II Blagoveshchensk in Russia, 1 in MPEC 2019-B152 -- 1620
474Mt. John Obs. in New Zealand, 1 in MPEC 2019-B149 -- 2019 BH4
G96Mt. Lemmon Survey (MLS) in Arizona, 3 in MPECs 2019-B144, 2019-B145 & 2019-B147 -- 2019 BK4, 2019 BG4, 2019 BF4
Z80Northolt Branch Obs. in England, 2 in MPEC 2019-B152 -- 2019 BF3, 2019 AV2
G34Oberfrauendorf Obs. in Germany, 2 in MPEC 2019-B152 -- 2019 AV2, 2009 SV17
I41Palomar Transient Factory in southern California, 1 in MPEC 2019-B148 -- 2019 BL4
F51Pan-STARRS 1 (PS1) in Hawaii, 4 in MPECs 2019-B146, 2019-B149, 2019-B151 & 2019-B152 -- 2019 BJ4, 2019 BH4, 2019 AW11, 2015 WH13
K61Rokycany Obs. in the Czech Republic, 4 in MPEC 2019-B152 -- 2019 BW1, 2019 BG1, 2019 AV2, 2019 AP11
C95SATINO-1 in France, 1 in MPEC 2019-B152 -- 173664
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2019-B144 -- 2019 BF4
291Spacewatch 1.8m telescope in Arizona, 2 in MPEC 2019-B152 -- 2019 BU3, 2019 AP8
I52Steward Obs. Mt. Lemmon Station in Arizona, 5 in MPECs 2019-B144, 2019-B145, 2019-B146, 2019-B147 & 2019-B149 -- 2019 BK4, 2019 BJ4, 2019 BH4, 2019 BG4, 2019 BF4
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2019-B152 -- 2018 XX2
L01Visnjan Obs., 6 in MPECs 2019-B144, 2019-B145, 2019-B146, 2019-B147, 2019-B148, 2019-B149 & 2019-B152 -- 2019 BL4, 2019 BK4, 2019 BJ4, 2019 BH4, 2019 BG4, 2019 BF4
718Wiggins Obs. in Utah, 1 in MPEC 2019-B152 -- 2019 AV2
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 30 January '19

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2330 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 XX2JPL Sentry17302106-210611.596e-07-7.53-7.530JPL: Computed at 08:00 today Pacific time based on 47 observations spanning 31.870 days (2018-Dec-10.53786 to 2019-Jan-11.407964). Diameter approximately 0.021 km. from weighted mean H=26.02.

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 30 January '19

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

1920Generated Traffic Report
1730Noted that JPL Sentry has updated its 2018 XX2 risk assessment - see above
Grabbed MPEC 2019-B150 - 2012 VK76 - see above
Grabbed MPEC 2019-B151 - 2015 WH13 - see above
Grabbed MPEC 2019-B152 - Daily Orbit Update - see above
0531Grabbed MPEC 2019-B144 - 2019 BF4 - see above
Grabbed MPEC 2019-B145 - 2019 BG4 - see above
Grabbed MPEC 2019-B146 - 2019 BJ4 - see above
Grabbed MPEC 2019-B147 - 2019 BK4 - see above
Grabbed MPEC 2019-B148 - 2019 BL4 - see above
Grabbed MPEC 2019-B149 - 2019 BH4 - see above