Contents  on 31 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 31 January '19

Eight objects reported inside ten LD

There are eight asteroids known to be inside ten lunar distances (LD) of our home world today. Nearest are 2019 BL4, moving away from 3.25 to 5.19 LD, and 2019 BJ1 outbound from 3.52 to 5.73 LD, while 2019 BR3 zooms in from about 6.0 to 3.8 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  7.25 to 9.63 LD Jan. 23 - Feb. 1 intruder, risk
1.6   LD Feb. 2* 2019 BR3 9 m  3.8 from 6.0 LD Jan. 29 - Feb. 6 EPU +/- 10 mins.*, NHATS target
1.71 LD Jan. 28 2019 BR2 8 m  8.32 to 11.21 LD Jan. 24 - 31 exits ten LD
2.57 LD yesterday 2019 BL4 9 m  3.25 to 5.19 LD Jan. 26 - Feb. 3
3.13 LD Jan. 26 2019 BU3 5 m  5.73 to 6.62 LD Jan. 16 - Feb. 4 NHATS target - DOU
3.42 LD yesterday 2019 BJ1 37 m  3.52 to 5.73 LD Jan. 28 - Feb. 2
4.76 LD Jan. 27 2019 BS2 12 m  8.54 to 10.50 LD Jan. 24 - 31 exits ten LD
4.99 LD Jan. 29 2019 BY3 12 m  5.55 to 6.63 LD Jan. 25 - Feb. 3 DOU
* EPU = Earth passage uncertainty

This report was generated at 1820 UTC with follow-up in today's DOU MPEC for outbound objects 2019 BY3 and (no longer) risk-listed 2019 BU3, and departed risk-listed 2019 BU1.

Approaching - sorted by 10-LD bubble entry date
4.1   LD Feb. 6* 2019 BK4 13 m  11.2 from 13.2 LD Feb. 1 - 10 EPU +/- 2.32 hours*, NHATS target
7.3   LD Feb. 12* 2017 PV25 41 m  17.5 from 18.9 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. "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 31 January '19

The MPC's NEO Confirmation Page has 54 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 54 objects listed. Of these, 40 were "one nighters." So far The Tracking News has counted a total of 68 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 31 January '19

Minor Planet Electronic Circulars

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


MPEC 2019-B160 - "18:42 UT" - 2019 BV4


<< DOU on 31 Jan. '19 >>  MPEC 2019-B159 - "13:13 UT" - Daily Orbit Update


MPEC 2019-B158 - "12:43 UT" - 2012 PS4


MPEC 2019-B157 - "11:16 UT" - 2012 OP4 = 2019 BR4

Id. R. Weryk, R. Maton, F. Manca


MPEC 2019-B156 - "04:19 UT" - 2019 BP4


MPEC 2019-B155 - "04:15 UT" - 2019 BS4


MPEC 2019-B154 - "04:11 UT" - 2019 BQ4


MPEC 2019-B153 - "04:06 UT" - 2019 BR4

Observers  on 31 January '19

A total of 35 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 4 in MPEC 2019-B159 -- 2019 AQ6, 2019 AP8, 2019 AP13, 2018 VS9
T05ATLAS Haleakala in Hawaii, 32 in MPEC 2019-B159 -- 89959, 86324, 523604, 523595, 512245, 511684, 480885, 459462, 458122, 457260, 410088, 382825, 381677, 33342, 31210, 308127, 275611, 20790, 20460, 18736, 137805, 137802, 137084, 11311, 6178, 5131, 3552, 2061, 1943, 1916, 1863, 1620
T08ATLAS Mauna Loa in Hawaii, 23 in MPECs 2019-B153, 2019-B155 & 2019-B159 -- 2019 BS4, 2019 BR4, 2019 BK, 2018 VW6, 2005 YY36, 90403, 523779, 523631, 523610, 453778, 418929, 417581, 325395, 31210, 25916, 244670, 163051, 5143, 4596, 4055, 1866, 1627, 719
160Castelmartini Obs. in Italy, 1 in MPEC 2019-B159 -- 152931
703Catalina Sky Survey (CSS) in Arizona, 43 in MPECs 2019-B154 & 2019-B159 -- 2019 BQ4, 2019 AV2, 2019 AR5, 2019 AP6, 2019 AA9, 2018 XV, 2018 VZ9, 2016 CA136, 2016 AZ8, 2011 OL5, 2009 SV17, 2006 OH15, 99799, 86324, 523603, 512245, 511684, 480885, 427643, 42286, 419829, 382825, 35396, 345722, 322913, 31210, 217807, 20790, 20460, 18736, 163693, 154656, 153243, 152931, 139056, 137925, 137924, 137805, 137802, 7358, 5131, 3691, 3552
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2019-B153 -- 2019 BR4
Z99Clixby Obs. in England, 3 in MPECs 2019-B153, 2019-B154 & 2019-B155 -- 2019 BS4, 2019 BR4, 2019 BQ4
734Farpoint Obs. in Kansas, 1 in MPEC 2019-B160 -- 2019 BV4
203GiaGa Obs. in Italy, 1 in MPEC 2019-B154 -- 2019 BQ4
J95Great Shefford Obs. in England, 4 in MPECs 2019-B153, 2019-B154, 2019-B155 & 2019-B156 -- 2019 BS4, 2019 BR4, 2019 BQ4, 2019 BP4
P93JAXA Space Tracking & Communications Center (JAXA STCC) in Japan, 3 in MPECs 2019-B153, 2019-B154 & 2019-B155 -- 2019 BS4, 2019 BR4, 2019 BQ4
Q67JBL Obs., 1 in MPEC 2019-B153 -- 2019 BR4
K91LCO Sutherland A in South Africa, 1 in MPEC 2019-B159 -- 2019 BY3
K38M57 Obs. in Italy, 1 in MPEC 2019-B154 -- 2019 BQ4
H01Magdalena Ridge Obs. (MRO) in New Mexico, 4 in MPECs 2019-B153, 2019-B154, 2019-B155 & 2019-B160 -- 2019 BV4, 2019 BS4, 2019 BR4, 2019 BQ4
474Mt. John Obs. in New Zealand, 7 in MPECs 2019-B153 & 2019-B159 -- 2019 BR4, 2019 BK, 2019 BF2, 2019 AV9, 2019 AO11, 2015 FB35, 2013 CW32
G96Mt. Lemmon Survey (MLS) in Arizona, 32 in MPECs 2019-B156, 2019-B159 & 2019-B160 -- 2019 BV4, 2019 BP4, 2019 AQ11, 2019 AM13, 2019 AK10, 2018 YS, 2018 YJ2, 2018 YA3, 2018 XB2, 2018 WK2, 2018 WC1, 2018 TC3, 2018 PL9, 2017 BL3, 2016 AZ8, 2015 BR515, 2014 XR6, 2013 VD13, 2013 BE19, 2008 WX32, 2002 AA2, 1999 CW8, 512234, 418900, 412995, 382459, 380476, 329390, 308127, 137924, 1981, 1620
I41Palomar Transient Factory (PTF) in southern California, 5 in MPECs 2019-B154 & 2019-B159 -- 2019 BQ4, 2018 PX23, 86324, 459462, 381677
F51Pan-STARRS 1 (PS1) in Hawaii, 28 in MPEC 2019-B159 -- 2019 AQ9, 2018 WV2, 2015 XC1, 2014 YR43, 2007 CK26, 2003 PC11, 2001 BP61, 1999 CW8, 52387, 486001, 474425, 366470, 363790, 349507, 285540, 283729, 175114, 17274, 170891, 16834, 144411, 141079, 13553, 9058, 6456, 5863, 1863, 1627
F52Pan-STARRS 2 (PS2) in Hawaii, 10 in MPECs 2019-B156 & 2019-B159 -- 2019 BP4, 457212, 455550, 314079, 303174, 186822, 185851, 153243, 137802, 8013
H45Petit Jean Mtn. South Obs. in Arkansas, 1 in MPEC 2019-B159 -- 2019 AV2
K61Rokycany Obs. in the Czech Republic, 3 in MPECs 2019-B153, 2019-B154 & 2019-B155 -- 2019 BS4, 2019 BR4, 2019 BQ4
K33San Defendente Obs. in Italy, 2 in MPECs 2019-B153 & 2019-B154 -- 2019 BR4, 2019 BQ4
H36Sandlot Obs. in Kansas, 1 in MPEC 2019-B154 -- 2019 BQ4
C95SATINO-1 in France, 1 in MPEC 2019-B159 -- 217796
204Schiaparelli Obs. in Italy, 1 in MPEC 2019-B154 -- 2019 BQ4
587Sormano Obs. in Italy, 1 in MPEC 2019-B154 -- 2019 BQ4
691Spacewatch 0.9m telescope in Arizona, 11 in MPEC 2019-B159 -- 2019 BU1, 2019 BK, 2019 BF, 2019 AX, 2019 AW4, 2019 AN5, 2019 AM10, 2019 AH13, 2018 WN2, 2014 XX31, 2012 OP4
291Spacewatch 1.8m telescope in Arizona, 8 in MPEC 2019-B159 -- 2019 BU3, 2019 BD3, 2019 AP8, 2019 AP6, 2018 YJ2, 2018 XV5, 2018 RJ7, 2015 BG4
I52Steward Obs. Mt. Lemmon Station in Arizona, 2 in MPECs 2019-B154 & 2019-B156 -- 2019 BQ4, 2019 BP4
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2019-B158 -- 2012 PS4
T14UH/Tholen NEO Follow-Up CFH Telescope in Hawaii, 1 in MPEC 2019-B158 -- 2012 PS4
L01Visnjan Obs., 3 in MPECs 2019-B153, 2019-B154 & 2019-B155 -- 2019 BS4, 2019 BR4, 2019 BQ4
718Wiggins Obs. in Utah, 1 in MPEC 2019-B159 -- 2013 CW32
C51WISE in Earth polar orbit, 7 in MPEC 2019-B159 -- 2018 YW, 450238, 442742, 423100, 228502, 140928, 1036
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 31 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
2019 BU3NEODyS1705R E M O V E D-
2019 BD3NEODyS1730211011.16e-09-9.65-9.650NEODyS: "Based on 23 optical observations (of which 0 are rejected as outliers) from 2019-01-26.447 to 2019-01-31.494."
2019 BU1NEODyS17302056-206227.68e-07-6.52-6.560NEODyS: "Based on 50 optical observations (of which 1 are rejected as outliers) from 2019-01-25.328 to 2019-01-31.428."
JPL Sentry17052056-206221.5508e-06-6.20-6.240JPL: Computed at 08:33 today Pacific time based on 50 observations spanning 6.1001 days (2019-Jan-25.32671 to 2019-Jan-31.42682). Diameter approximately 0.020 km. from weighted mean H=26.13.

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 31 January '19

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

1900Grabbed MPEC 2019-B160 - 2019 BV4 - see above
1820Generated Traffic Report
1730Noted that NEODyS has updated its 2019 BD3 risk assessment - see above
Noted that NEODyS has updated its 2019 BU1 risk assessment - see above
1705Noted that JPL Sentry has updated its 2019 BU1 risk assessment - see above
Noted that NEODyS has removed 2019 BU3 as an impact risk - see above
1630Grabbed MPEC 2019-B157 - 2012 OP4 = 2019 BR4 - see above
Grabbed MPEC 2019-B158 - 2012 PS4 - see above
Grabbed MPEC 2019-B159 - Daily Orbit Update - see above
0520Grabbed MPEC 2019-B153 - 2019 BR4 - see above
Grabbed MPEC 2019-B154 - 2019 BQ4 - see above
Grabbed MPEC 2019-B155 - 2019 BS4 - see above
Grabbed MPEC 2019-B156 - 2019 BP4 - see above