Contents  on 4 February '17

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 '17

Eleven objects reported inside ten LD

Today eleven asteroidal objects are reported to be less than ten lunar distances (LD) from Earth. Nearest is NHATS target 2017 BG30, inbound from 2.72 to 2.51 LD. Further out, new discovery 2017 CR comes in from 9.37 to 6.19 LD while two other objects move into the ten LD space: 2017 BQ6 slides in from 10.54 to 8.71 LD and 2017 BM93 from 12.12 to 9.83 LD.

Earth passage I D ~Size Distance Today  Notes
0.42 LD Feb. 22017 BS32 11 m  2.98 to 5.53 LD intruder - DOU
1.03 LD Jan. 312017 BJ30 16 m  5.15 to 6.43 LD NHATS target
2.48 LD tomorrow2017 BG30 4 m  2.51 from 2.72 LD NHATS target
2.97 LD Jan. 312017 BB7 9 m  6.01 to 7.45 LD NHATS target
3.36 LD Feb. 82017 BM93 15 m  9.83 from 12.12 LD enters ten LD
4.27 LD Feb. 62017 CR 17 m  6.19 from 9.37 LD NEW - MPEC
4.84 LD Feb. 12017 BN92 25 m  5.89 to 6.80 LD
5.57 LD Feb. 22017 BB6 13 m  6.84 to 8.31 LD
6.57 LD Feb. 72017 BQ6 181 m  8.71 from 10.54 LD enters ten LD - DOU
7.10 LD tomorrow2013 FK 78 m  7.24 from 7.87 LD
8.64 LD tomorrow2017 BK30 12 m  8.90 from 9.73 LD risk - DOU

Among the next objects known to be approaching, radar/NHATS target 2017 BW arrives inside ten LD on February 9th, newly announced risk-listed 2017 BY93 enters on or about February 21st, and, looking much further ahead, the newest discovery, risk-listed 2017 CS, heaves into our traffic reporting "bubble" on May 26th.

Approaching (sorted by 10-LD bubble entry date)
4.64 LD Feb. 172017 BW 70 m  < 10 LD Feb. 9, radar/NHATS target - DOU
2.4   LD Feb. 232017 BY93 79 m  < 10 LD Feb. 21, NEW, uncertainty +/- 3.0333 hours, risk - MPEC
2.7   LD March 22012 DR32 41 m  < 10 LD Feb. 28, uncertainty +/- 4.1333 hours
8.34 LD March 161998 SL36 309 m  < 10 LD March 14 - DOU
7.63 LD March 262015 TC25 4 m  < 10 LD March 17, radar/NHATS target, risk
4.57 LD April 192014 JO25 812 m  < 10 LD April 18
7.9   LD May 292017 CS 419 m  < 10 LD May 26, NEW, uncertainty +/- 4.3167 hours, risk - MPEC

This report was generated at 1817 UTC with the discoveries of 2017 CS (MPEC), 2017 CR (MPEC), 2017 BY93 (MPEC), and already departed 2017 CP (MPEC), which flew past us at 8.17 LD on January 25th. Today's DOU MPEC has follow-up for outbound intruder 2017 BS32, inbound objects 2017 BQ6 and risk-listed 2017 BK30, and approaching radar/NHATS target 2017 BW, plus astrometry from last year for approaching 1998 SL36.
        Today we are also adding to this traffic reporting three other approaching objects: 2012 DR32, 2014 JO25, and radar/NHATS target 2015 TC25. We also note that there are another three objects that are tenuously calculated to be flying or have flown just barely inside or outside of ten LD: 2017 BF92 (MPEC) and NHATS target 2017 BW93 (MPEC), which both went by in January, and approaching NHATS target 2014 DV110. We will add each to this reporting when and if they prove to be close passers.



Notes: Ten times the distance to the Moon (ten LD) has no astronomical importance but is a useful boundary for reporting on transient natural objects that approach the actually significant 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 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 '17

The MPC's NEO Confirmation Page has 122 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 122 objects listed. Of these, 63 were "one nighters." So far The Tracking News has counted a total of 136 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 '17

Minor Planet Electronic Circulars

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


MPEC 2017-C48 - "19:32 UT" - 2016 CO246


<< DOU on 4 Feb. '17 >>  MPEC 2017-C47 - "13:19 UT" - Daily Orbit Update


MPEC 2017-C46 - "02:24 UT" - Comet P/2017 B4 (Panstarrs)


MPEC 2017-C45 - "02:17 UT" - Comet C/2017 B3 (LINEAR)


MPEC 2017-C44 - "01:32 UT" - 2017 CT


MPEC 2017-C43 - "01:29 UT" - 2017 CS


MPEC 2017-C42 - "01:25 UT" - 2017 CR


MPEC 2017-C41 - "01:22 UT" - 2017 CQ


MPEC 2017-C40 - "01:18 UT" - 2017 CP


MPEC 2017-C39 - "01:15 UT" - 2017 CO


MPEC 2017-C38 - "01:12 UT" - 2017 BB94


MPEC 2017-C37 - "01:08 UT" - 2017 BA94


MPEC 2017-C36 - "01:04 UT" - 2017 BZ93


MPEC 2017-C35 - "00:58 UT" - 2017 BY93

Observers  on 4 February '17

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

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 9 in MPEC 2017-C47 -- 2017 BW30, 2017 BW, 2017 BU31, 2017 BU, 2017 BN32, 2017 BL30, 2017 BE29, 2017 AC5, 2016 XD1
T05ATLAS Haleakala in Hawaii, 1 in MPEC 2017-C47 -- 153201
300Bisei Spaceguard Center in Japan, 1 in MPEC 2017-C44 -- 2017 CT
160Castelmartini Obs. in Italy, 4 in MPEC 2017-C47 -- 65674, 347813, 24445, 433
I17Cupillari Obs. in Pennsylvania, 1 in MPEC 2017-C47 -- 136635
J04ESA Optical Ground Station in the Canary Islands, 1 in MPEC 2017-C48 -- 2016 CO246
F652Lothar Kurtze in Germany via Faulkes Telescope North in Hawaii, 2 in MPEC 2017-C47 -- 2017 BS32, 2017 BQ6
K88GINOP-KHK in Hungary, 1 in MPEC 2017-C45 -- C/2017 B3
J95Great Shefford Obs. in England, 4 in MPECs 2017-C36, 2017-C42, 2017-C44 & 2017-C47 -- 2017 CT, 2017 CR, 2017 BZ93, 2017 BK30
U695Hidetaka Sato in Japan via iTelescope Obs. Auberry in northern California, 1 in MPEC 2017-C45 -- C/2017 B3
H06iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2017-C47 -- 2017 BQ6
H06|Hidetaka Sato in Japan via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2017-C46 -- P/2017 B4
Q622Marian Urbanik in Slovakia via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-C45 -- C/2017 B3
Q623Rolando Ligustri in Italy via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-C45 -- C/2017 B3
Q626Erik Bryssinck in Belgium via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-C45 -- C/2017 B3
Q62|Sergio Foglia in Italy via iTelescope Obs. Siding Spring in New South Wales, 3 in MPECs 2017-C45 & 2017-C47 -- 2017 BW, 2017 BS32, C/2017 B3
W85LCOGT Cerro Tololo A in Chile, 3 in MPECs 2017-C37 & 2017-C47 -- 2017 BW, 2017 BA94, 2011 EP51
W86LCOGT Cerro Tololo B in Chile, 4 in MPECs 2017-C35 & 2017-C47 -- 2017 BY93, 2011 EP51, 265482, 192559
V37LCOGT Fort Davis in Texas, 1 in MPEC 2017-C41 -- 2017 CQ
T04LCOGT Haleakala OGG B#2 in Hawaii, 1 in MPEC 2017-C47 -- 2017 BS32
K93LCOGT Sutherland C in South Africa, 1 in MPEC 2017-C45 -- C/2017 B3
K30Luscherz Obs. in Switzerland, 1 in MPEC 2017-C47 -- 2017 BW
H01Magdalena Ridge Obs. (MRO) in New Mexico, 3 in MPECs 2017-C38, 2017-C40 & 2017-C45 -- 2017 CP, 2017 BB94, C/2017 B3
568_Marco Micheli on Mauna Kea in Hawaii, 4 in MPECs 2017-C35, 2017-C36, 2017-C41 & 2017-C46 -- 2017 CQ, 2017 BZ93, 2017 BY93, P/2017 B4
474Mt. John Obs. in New Zealand, 1 in MPEC 2017-C45 -- C/2017 B3
G96Mt. Lemmon Survey (MLS) in Arizona, 21 in MPECs 2017-C38, 2017-C39, 2017-C40, 2017-C41, 2017-C42, 2017-C44, 2017-C46 & 2017-C47 -- 2017 CT, 2017 CR, 2017 CQ, 2017 CP, 2017 CO, 2017 BZ93, 2017 BZ6, 2017 BX5, 2017 BL30, 2017 BB94, P/2017 B4, 2017 AH13, 2013 CL118, 2013 BM76, 2010 GA34, 2006 WS1, 2000 DO1, 36017, 144411, 143947, 10165
Z80Northolt Branch Obs. in England, 1 in MPEC 2017-C47 -- 2017 BW
F51Pan-STARRS 1 (PS1) in Hawaii, 23 in MPECs 2017-C35, 2017-C36, 2017-C37, 2017-C41, 2017-C43, 2017-C44, 2017-C46 & 2017-C47 -- 2017 CT, 2017 CS, 2017 CQ, 2017 BZ93, 2017 BY93, 2017 BW30, 2017 BD30, 2017 BA94, P/2017 B4, 2017 AM4, 2016 NQ32, 2015 FD35, 2015 BO509, 2014 KF91, 1998 SL36, 420187, 308899, 276703, 267221, 226198, 152679, 4055, 3199
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 5 in MPEC 2017-C47 -- 96590, 85804, 54789, 347813, 5653
6581Dave Balam via Plaskett 1.8m Telescope in British Columbia, 2 in MPECs 2017-C38 & 2017-C46 -- 2017 BB94, P/2017 B4
Y28Sertao de Itaparica Obs. (OASI) in Brazil, 3 in MPECs 2017-C47 & 2017-C48 -- 2017 BL32, 2017 BL30, 2016 CO246
G409B. Lutkenhoner in Germany via Slooh.com Canary Islands Obs. in the Canary Islands, 2 in MPECs 2017-C45 & 2017-C46 -- P/2017 B4, C/2017 B3
G45Space Surveillance Telescope Atom Site in New Mexico, 1 in MPEC 2017-C45 -- C/2017 B3
691Spacewatch 0.9m telescope in Arizona, 4 in MPECs 2017-C37, 2017-C46 & 2017-C47 -- 2017 BL32, 2017 BL30, 2017 BA94, P/2017 B4
291Spacewatch 1.8m telescope in Arizona, 5 in MPECs 2017-C37, 2017-C41, 2017-C43, 2017-C46 & 2017-C47 -- 2017 CS, 2017 CQ, 2017 BA94, P/2017 B4, 2017 AT19
I52Steward Obs. Mt. Lemmon Station in Arizona, 8 in MPECs 2017-C38, 2017-C39, 2017-C40, 2017-C42, 2017-C44, 2017-C45, 2017-C46 & 2017-C47 -- 2017 CT, 2017 CR, 2017 CP, 2017 CO, 2017 BS32, 2017 BB94, P/2017 B4, C/2017 B3
J22Tacande Obs. in the Canary Islands, 1 in MPEC 2017-C45 -- C/2017 B3
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-C47 -- 2017 BL30
C51WISE in Earth polar orbit, 2 in MPEC 2017-C47 -- 2017 BA30, 262623
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 4 February '17

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL 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 is 100 years from today and for NEODyS is usually the year 2090. Both also post impact solutions beyond 100 years for a few special objects.
For the latest official risk assessments, and for explanations of the terminology, see the JPL NEO Program 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
2017 CSNEODyS1600205913.06e-07-3.95-3.950NEODyS: "Based on 15 optical observations (of which 0 are rejected as outliers) from 2017-01-20.570 to 2017-02-03.330."
JPL Sentry0402205912.4e-09-6.01-6.010JPL: "Analysis based on 15 observations spanning 13.760 days (2017-Jan-20.56923 to 2017-Feb-03.32884)." Diameter approximately 0.420 km. from mean, weighted H=19.5.
2017 BY93NEODyS16002044-2086331.91e-05-3.47-3.970NEODyS: "Based on 14 optical observations (of which 0 are rejected as outliers) from 2017-01-26.500 to 2017-02-02.408."
JPL Sentry04022043-2077281.7e-05-3.51-4.100JPL: "Analysis based on 14 observations spanning 6.9080 days (2017-Jan-26.49954 to 2017-Feb-02.407551)." Diameter approximately 0.080 km. from mean, weighted H=23.1.
2017 BW30NEODyS20312074-2111107.8e-08-6.77-7.160NEODyS: "Based on 45 optical observations (of which 1 are rejected as outliers) from 2017-01-28.542 to 2017-02-02.538."
JPL Sentry1631R E M O V E DJPL: Risk listing removed at 1608 UTC.
2017 BL30JPL Sentry22112029-2052128.0e-04-1.88-1.891JPL: "Analysis based on 77 observations spanning 6.8012 days (2017-Jan-28.37792 to 2017-Feb-04.17914)." Diameter approximately 0.070 km. from mean, weighted H=23.4.
NEODyS20312029-2113327.53e-04-1.90-1.911NEODyS: "Based on 77 optical observations (of which 0 are rejected as outliers) from 2017-01-28.379 to 2017-02-04.180."
2017 BK30NEODyS20312085-210648.39e-07-7.33-7.560NEODyS: "Based on 30 optical observations (of which 3 are rejected as outliers) from 2017-01-26.449 to 2017-02-04.013."
JPL Sentry1631208535.1e-07-7.53-7.780JPL: "Analysis based on 30 observations spanning 8.5641 days (2017-Jan-26.44804 to 2017-Feb-04.012101)." Diameter approximately 0.012 km. from mean, weighted H=27.2.
2005 VL1NEODyS1600R E M O V E D-

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 '17

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

2211Noted that JPL Sentry has updated its 2017 BL30 risk assessment - see above
2031Noted that NEODyS has updated its 2017 BK30 risk assessment - see above
Noted that NEODyS has updated its 2017 BL30 risk assessment - see above
Noted that NEODyS has updated its 2017 BW30 risk assessment - see above
Grabbed MPEC 2017-C48 - 2016 CO246 - see above
1817Generated Traffic Report
1631Noted that JPL Sentry has updated its 2017 BK30 risk assessment - see above
Noted that JPL Sentry has removed 2017 BW30 as an impact risk - see above
1600Noted that NEODyS has removed 2005 VL1 as an impact risk - see above
Noted that NEODyS has posted 2017 BY93 as an impact risk - see above
Noted that NEODyS has posted 2017 CS as an impact risk - see above
Grabbed MPEC 2017-C47 - Daily Orbit Update - see above
0402Noted that JPL Sentry has posted 2017 BY93 as an impact risk - see above
Noted that JPL Sentry has posted 2017 CS as an impact risk - see above
Grabbed MPEC 2017-C35 - 2017 BY93 - see above
Grabbed MPEC 2017-C36 - 2017 BZ93 - see above
Grabbed MPEC 2017-C37 - 2017 BA94 - see above
Grabbed MPEC 2017-C38 - 2017 BB94 - see above
Grabbed MPEC 2017-C39 - 2017 CO - see above
Grabbed MPEC 2017-C40 - 2017 CP - see above
Grabbed MPEC 2017-C41 - 2017 CQ - see above
Grabbed MPEC 2017-C42 - 2017 CR - see above
Grabbed MPEC 2017-C43 - 2017 CS - see above
Grabbed MPEC 2017-C44 - 2017 CT - see above
Grabbed MPEC 2017-C45 - Comet C/2017 B3 (LINEAR) - see above
Grabbed MPEC 2017-C46 - Comet P/2017 B4 (Panstarrs) - see above