Contents  on 4 February '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 4 February '19

Three objects reported inside ten LD

Today three asteroidal objects are reported to be less than ten lunar distances (LD) from Earth. Closest is 2019 BR3, which heads away from about 3.8 to 5.9 LD*.

Neighborhood Traffic - sorted by Earth passage distance, grouped by 1.0, 2.41 & 5.0 LD boundaries
Earth passage I D ~Size Distance today  Inside ten LD Notes
1.6   LD Feb. 2* 2019 BR3 9 m  3.8 to 5.9 LD Jan. 29 - Feb. 6 EPU +/- 9 mins.*, NHATS target
3.13 LD Jan. 26 2019 BU3 5 m  9.46 to 10.43 LD Jan. 16 - today NHATS target, exits ten LD
4.14 LD Feb. 6 2019 BK4 13 m  4.69 from 5.94 LD Feb. 1 - 10 NHATS target
Approaching
7.3   LD Feb. 12* 2017 PV25 41 m  12.6 from 13.8 LD Feb. 7 - 17 EPU +/- 1.07 hours*, NHATS target
* EPU = Earth passage uncertainty

This report was generated at 1845 UTC with the discovery of departed 2019 BF5 (MPEC, DOU), which passed us at 9.45 LD on January 29th, and with follow-up in today's DOU MPEC for departed objects 2019 BP2 and risk-listed 2019 BE5, along with astrometry from early January for risk-listed 2018 YQ.



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 4 February '19

The MPC's NEO Confirmation Page has 82 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 82 objects listed. Of these, 70 were "one nighters." So far The Tracking News has counted a total of 86 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 4 February '19

Minor Planet Electronic Circulars

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


<< DOU on 4 Feb. '19 >>  MPEC 2019-C23 - "13:10 UT" - Daily Orbit Update


MPEC 2019-C22 - "12:29 UT" - 2015 GS13


MPEC 2019-C21 - "04:02 UT" - Comet P/2019 B2 (Groeller)


MPEC 2019-C20 - "03:32 UT" - Comet P/2019 A8 (Panstarrs)


MPEC 2019-C19 - "01:03 UT" - 2019 BF5

Observers  on 4 February '19

A total of 42 observers appear in today's MPECs.

CodeObserver / observatory
L2729PREMOTE Obs., 1 in MPEC 2019-C21 -- P/2019 B2
T08ATLAS Mauna Loa in Hawaii, 42 in MPECs 2019-C19 & 2019-C23 -- 2019 BG1, 2019 BF5, 2016 CA136, 2016 BA40, 2012 BC124, 2009 SV17, 2005 CL7, 99935, 89959, 86324, 68346, 68063, 523824, 523811, 523604, 515767, 512245, 511684, 458122, 418929, 417581, 410088, 381677, 33342, 318411, 275611, 267759, 230111, 21088, 18736, 163902, 163081, 111253, 10302, 9162, 6455, 4401, 3200, 3199, 2212, 2061, 1036
I47Auger Obs. in Argentina, 1 in MPEC 2019-C21 -- P/2019 B2
160Castelmartini Obs. in Italy, 9 in MPEC 2019-C23 -- 2009 SV17, 515767, 512245, 511684, 459462, 31210, 18736, 137925, 7358
703Catalina Sky Survey (CSS) in Arizona, 3 in MPECs 2019-C21 & 2019-C23 -- P/2019 B2, 137805, 6455
Z99Clixby Obs. in England, 1 in MPEC 2019-C21 -- P/2019 B2
L29Drebach-South Obs., 1 in MPEC 2019-C21 -- P/2019 B2
006Fabra Obs. in Spain, 2 in MPEC 2019-C23 -- 137805, 5131
E94Gisborne Obs. in New Zealand, 1 in MPEC 2019-C21 -- P/2019 B2
K73Gravina Obs. in Italy, 2 in MPEC 2019-C23 -- 18736, 1620
J95Great Shefford Obs. in England, 1 in MPEC 2019-C21 -- P/2019 B2
H06|Hidetaka Sato in Japan via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2019-C21 -- P/2019 B2
695^Spacewatch via Kitt Peak Natl. Obs. in Arizona, 1 in MPEC 2019-C20 -- P/2019 A8
Z22MASTER IAC Obs. in the Canary Islands, 2 in MPEC 2019-C23 -- 7358, 1036
L52MASTER Tavrida, 3 in MPEC 2019-C23 -- 267759, 18736, 1036
568^R. Wainscoat on Mauna Kea in Hawaii, 1 in MPEC 2019-C20 -- P/2019 A8
711McDonald Obs. in Texas, 15 in MPECs 2019-C20, 2019-C21 & 2019-C23 -- 2019 BV4, 2019 BS4, 2019 BQ3, 2019 BP2, 2019 BN1, 2019 BF2, 2019 BE5, 2019 BB1, P/2019 B2, 2019 AS4, 2019 AR14, 2019 AQ9, 2019 AD5, 2019 AB9, P/2019 A8
474Mt. John Obs. in New Zealand, 10 in MPECs 2019-C19 & 2019-C23 -- 2019 BF5, 2019 BF2, 2019 AV9, 2019 AU3, 2019 AO3, 2019 AM10, 2019 AL2, 2018 YU, 2018 YB1, 2017 QF17
K74Muensterschwarzach Obs. in Germany, 1 in MPEC 2019-C23 -- 7482
J69North Obs. in England, 1 in MPEC 2019-C23 -- 2019 BE5
C23Olmen Obs. in Belgium, 1 in MPEC 2019-C19 -- 2019 BF5
I41Palomar Transient Factory in southern California, 1 in MPEC 2019-C19 -- 2019 BF5
F51Pan-STARRS 1 (PS1) in Hawaii, 5 in MPECs 2019-C20, 2019-C21 & 2019-C23 -- P/2019 B2, P/2019 A8, 68359, 363790, 152756
F52Pan-STARRS 2 (PS2) in Hawaii, 7 in MPEC 2019-C23 -- 2019 BT3, 2019 BF5, 2018 YD3, 2018 NR4, 2015 BY310, 2012 BN11, 511684
323Perth Obs. in Western Australia, 1 in MPEC 2019-C23 -- 2012 OP4
D29Purple Mtn. Obs. Xuyi Station in China, 13 in MPEC 2019-C23 -- 2018 XU6, 99799, 512245, 242147, 228502, 18736, 16834, 155110, 152564, 137805, 12538, 6178, 1620
K61Rokycany Obs. in the Czech Republic, 1 in MPEC 2019-C21 -- P/2019 B2
C95SATINO-1 in France, 1 in MPEC 2019-C23 -- 250697
204Schiaparelli Obs. in Italy, 2 in MPEC 2019-C23 -- 2018 XC2, 2011 OL5
033Schwarzschild Obs. in Germany, 1 in MPEC 2019-C21 -- P/2019 B2
Q11Shinshiro Obs., 1 in MPEC 2019-C21 -- P/2019 B2
G40"G. Gasparovic in Croatia via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2019-C21 -- P/2019 B2
G409B. Lutkenhoner in Germany via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2019-C21 -- P/2019 B2
587Sormano Obs. in Italy, 1 in MPEC 2019-C21 -- P/2019 B2
L06Sormano2 Obs. in Italy, 1 in MPEC 2019-C21 -- P/2019 B2
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2019-C23 -- 459462
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2019-C20 -- P/2019 A8
W34Squirrel Valley Obs. in North Carolina, 2 in MPEC 2019-C23 -- 2016 AZ8, 2013 CW32
I52Steward Obs. Mt. Lemmon Station in Arizona, 2 in MPECs 2019-C20 & 2019-C21 -- P/2019 B2, P/2019 A8
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 4 in MPECs 2019-C22 & 2019-C23 -- 2018 YZ1, 2018 YQ2, 2018 NT2, 2015 GS13
K41Vegaquattro Obs. in Italy, 1 in MPEC 2019-C21 -- P/2019 B2
L01Visnjan Obs., 2 in MPECs 2019-C19 & 2019-C21 -- 2019 BF5, P/2019 B2
J08Zonalunar Obs. in Spain, 1 in MPEC 2019-C19 -- 2019 BF5
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 4 February '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 BE5JPL Sentry17312038-2081101.353618e-05-4.53-4.610JPL: Computed at 08:49 today Pacific time based on 63 observations spanning 3.7719 days (2019-Jan-31.324536 to 2019-Feb-04.09646). Diameter approximately 0.034 km. from weighted mean H=25.00.
NEODyS17002038-2116291.97e-05-4.40-4.480NEODyS: "Based on 63 optical observations (of which 0 are rejected as outliers) from 2019-01-31.325 to 2019-02-04.097."
2019 BU1JPL Sentry17312056-206221.6035e-06-6.19-6.230JPL: Computed at 08:59 today Pacific time based on 56 observations spanning 8.9421 days (2019-Jan-25.32671 to 2019-Feb-03.26884). Diameter approximately 0.020 km. from weighted mean H=26.14.
2018 YQ2JPL Sentry17312116-211611.538e-07-7.79-7.790JPL: Computed at 08:09 today Pacific time based on 53 observations spanning 9.0389 days (2018-Dec-31.16339 to 2019-Jan-09.2023). Diameter approximately 0.021 km. from weighted mean H=26.07.
NEODyS17002077-211651.82e-07-7.73-7.910NEODyS: "Based on 54 optical observations (of which 1 are rejected as outliers) from 2018-12-31.159 to 2019-01-09.203."

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 4 February '19

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

1845Generated Traffic Report
1731Noted that JPL Sentry has updated its 2018 YQ2 risk assessment - see above
Noted that JPL Sentry has updated its 2019 BE5 risk assessment - see above
Noted that JPL Sentry has updated its 2019 BU1 risk assessment - see above
1700Noted that NEODyS has updated its 2018 YQ2 risk assessment - see above
Noted that NEODyS has updated its 2019 BE5 risk assessment - see above
Grabbed MPEC 2019-C22 - 2015 GS13 - see above
Grabbed MPEC 2019-C23 - Daily Orbit Update - see above
0425Grabbed MPEC 2019-C19 - 2019 BF5 - see above
Grabbed MPEC 2019-C20 - Comet P/2019 A8 (Panstarrs) - see above
Grabbed MPEC 2019-C21 - Comet P/2019 B2 (Groeller) - see above