Contents  on 2 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 2 February '17

Eight objects reported inside ten LD

There are eight visitors known to be inside ten lunar distances (LD) of Earth today. Nearest is intruder 2017 BS32, which enters the Earth-Moon system, coming in from 2.22 LD and passing us at 0.42 LD at 2024 UTC, ending the day still less than one LD from both Earth and Moon. Out further, 2017 BB6 comes its closest to our planet this time around -- 5.57 LD at 0442 UTC, while 2013 FK comes into our ten-LD traffic-reporting "bubble," flying in from 10.18 to 8.89 LD, and intruder 2017 BH30 departs the bubble, zooming off from 9.43 to 12.80 LD.

Earth passage I D ~Size Distance Today  Notes
0.13 LD Jan. 302017 BH30 6 m  9.43 to 12.80 LD exits ten LD, intruder
0.42 LD today2017 BS32 12 m  0.42 LD intruder today, Earth closest at 2024 UTC - DOU
1.03 LD Jan. 312017 BJ30 16 m  2.67 to 3.89 LD NHATS target
2.48 LD Feb. 52017 BG30 4 m  3.10 from 3.58 LD NHATS target - DOU
2.97 LD Jan. 312017 BB7 9 m  3.59 to 4.69 LD NHATS target
4.84 LD yesterday2017 BN92 25 m  4.87 to 5.21 LD DOU
5.57 LD today2017 BB6 13 m  5.57 LD Earth closest at 0442 UTC
7.10 LD Feb. 52013 FK 78 m  8.89 from 10.18 LD enters ten LD
Approaching
4.64 LD Feb. 172017 BW 70 m  < 10 LD Feb. 9, radar/NHATS target
6.57 LD Feb. 72017 BQ6 183 m  < 10 LD Feb. 4 - DOU
8.64 LD Feb. 52017 BK30 12 m  < 10 LD tomorrow, risk

This report was generated at 1952 UTC with first follow-up for intruder 2017 BS32 (now passing) and departed objects 2017 BR32 and risk-listed 2017 BD6 (4.29 days added to 0.90-day discovery arc), plus additional observation of outbound 2017 BN92, in today's DOU MPEC, along with continuing follow-up for approaching 2017 BQ6, inbound NHATS target 2017 BG30, and five departed objects: 2017 BQ30, 2017 BM30, 2017 AO4, NHATS target 2017 AG5, and risk-listed 2017 BE30.



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 2 February '17

The MPC's NEO Confirmation Page has 117 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 117 objects listed. Of these, 57 were "one nighters." So far The Tracking News has counted a total of 149 listings on the NEOCP today.

New MPECs  on 2 February '17

Minor Planet Electronic Circulars

As of last check at 2359 UTC, there have been four MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2017-C19 - "14:51 UT" - 2016 FS6


MPEC 2017-C18 - "14:49 UT" - 2012 UU136


MPEC 2017-C17 - "14:47 UT" - 2004 AY1


<< DOU on 2 Feb. '17 >>  MPEC 2017-C16 - "13:06 UT" - Daily Orbit Update

Observers  on 2 February '17

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

CodeObserver / observatory
705"Kristie Nault via Apache Point Obs. in New Mexico, 1 in MPEC 2017-C16 -- 2017 BK3
H21Astronomical Research Obs. Westfield in Illinois, 7 in MPEC 2017-C16 -- 2017 BX6, 2017 BO3, 2017 BL3, 2017 BK3, 2017 BD29, 2017 AO13, 2016 YU10
160Castelmartini Obs. in Italy, 2 in MPEC 2017-C16 -- 185851, 171819
703Catalina Sky Survey (CSS) in Arizona, 26 in MPEC 2017-C16 -- 2017 AP20, 2017 AF5, 2016 QC84, 2015 BN509, 2014 BG3, 2013 GL8, 2006 WS1, 2005 TF, 96590, 85804, 452389, 438955, 370702, 370307, 36017, 34613, 265482, 25916, 250614, 138359, 5693, 4179, 3352, 3103, 1916, 1862
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 14 in MPECs 2017-C16 & 2017-C19 -- 2017 BS31, 2017 BR31, 2017 BQ5, 2017 BQ30, 2017 BP31, 2017 BL6, 2017 AW3, 2017 AK4, 2016 YZ, 2016 YM1, 2016 WR3, 2016 RC20, 2016 QY83, 2016 FS6
I57Elche Obs. in Spain, 1 in MPEC 2017-C16 -- 2017 BN92
F652Lothar Kurtze in Germany via Faulkes Telescope North in Hawaii, 1 in MPEC 2017-C16 -- 2017 BS32
950.Ovidiu Vaduvescu via La Palma in the Canary Islands, 2 in MPEC 2017-C16 -- 2012 DH4, 2002 EX8
W85LCOGT Cerro Tololo A in Chile, 2 in MPEC 2017-C16 -- 2011 EP51, 192559
W87LCOGT Cerro Tololo C in Chile, 1 in MPEC 2017-C16 -- 192559
Q63LCOGT Siding Spring A in New South Wales, 2 in MPEC 2017-C16 -- 2011 EP51, 192559
K92LCOGT Sutherland B in South Africa, 1 in MPEC 2017-C16 -- 2011 EP51
K93LCOGT Sutherland C in South Africa, 1 in MPEC 2017-C16 -- 192559
K95MASTER-II Sutherland in South Africa, 1 in MPEC 2017-C16 -- 5626
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2017-C18 -- 2012 UU136
568_Marco Micheli on Mauna Kea in Hawaii, 1 in MPEC 2017-C17 -- 2004 AY1
G96Mt. Lemmon Survey (MLS) in Arizona, 23 in MPEC 2017-C16 -- 2017 BZ6, 2017 AO4, 2016 OP5, 2016 NL15, 2011 WO41, 2005 TF, 2003 WM25, 85990, 481904, 420187, 388798, 380981, 357621, 313809, 275611, 175189, 154029, 152671, 143404, 5828, 5189, 4055, 3552
G34Oberfrauendorf Obs. in Germany, 2 in MPEC 2017-C16 -- 2017 BQ6, 11398
F51Pan-STARRS 1 (PS1) in Hawaii, 15 in MPECs 2017-C16 & 2017-C17 -- 2017 BJ92, 2017 AZ13, 2017 AP20, 2016 YY7, 2016 YV8, 2016 VY3, 2016 PR8, 2012 MJ6, 2004 AY1, 391275, 388798, 351370, 275611, 154029, 5653
691Spacewatch 0.9m telescope in Arizona, 24 in MPECs 2017-C16 & 2017-C17 -- 2017 BU31, 2017 BQ30, 2017 BP31, 2017 BP30, 2017 BO31, 2017 BM31, 2017 BL31, 2017 BH3, 2017 BF29, 2017 BE29, 2017 AM4, 2017 AG5, 2016 YF11, 2016 XD1, 2016 WP48, 2016 VV3, 2016 QC84, 2016 PZ66, 2016 PN38, 2016 LE9, 2004 AY1, 2003 EZ16, 2003 CR1, 2000 CE59
291Spacewatch 1.8m telescope in Arizona, 3 in MPECs 2017-C16 & 2017-C17 -- 2017 BO32, 2016 LM8, 2004 AY1
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2017-C16 -- 2012 BX13
I52Steward Obs. Mt. Lemmon Station in Arizona, 19 in MPEC 2017-C16 -- 2017 BZ6, 2017 BW30, 2017 BU31, 2017 BR32, 2017 BR31, 2017 BQ91, 2017 BQ32, 2017 BP32, 2017 BP31, 2017 BP30, 2017 BN30, 2017 BM6, 2017 BM32, 2017 BM30, 2017 BK92, 2017 BH29, 2017 BG32, 2017 BG30, 2017 BA30
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 6 in MPECs 2017-C16 & 2017-C18 -- 2017 BW30, 2017 BF30, 2017 BE30, 2017 BD6, 2017 AK3, 2012 UU136
C51WISE in Earth polar orbit, 2 in MPEC 2017-C16 -- 2017 BA30, 345646
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 2 February '17

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2359 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 BO32JPL Sentry17302021-21141581.4e-04-3.36-3.670JPL: "Analysis based on 14 observations spanning 3.7127 days (2017-Jan-29.39721 to 2017-Feb-02.10992)." Diameter approximately 0.040 km. from mean, weighted H=24.6.
NEODyS17002025-21141761.07e-04-3.69-3.890NEODyS: "Based on 14 optical observations (of which 0 are rejected as outliers) from 2017-01-29.398 to 2017-02-02.111."
2017 BW30JPL Sentry1833211112.4e-08-7.33-7.330JPL #2 for the day: "Analysis based on 32 observations spanning 4.8322 days (2017-Jan-28.54123 to 2017-Feb-02.37345)." Diameter approximately 0.055 km. from mean, weighted H=23.9.
NEODyS17002071-2112154.72e-07-5.99-6.510NEODyS: "Based on 38 optical observations (of which 1 are rejected as outliers) from 2017-01-28.542 to 2017-02-02.374."
2017 BL30NEODyS17002029-2077294.14e-04-2.16-2.190NEODyS: "Based on 48 optical observations (of which 0 are rejected as outliers) from 2017-01-28.379 to 2017-02-01.384."
2017 BF30JPL Sentry1901211113.3e-10-9.58-9.580JPL #2 for the day: "Analysis based on 15 observations spanning 3.9650 days (2017-Jan-27.63079 to 2017-Jan-31.595823)." Diameter approximately 0.049 km. from mean, weighted H=24.2.
NEODyS1700R E M O V E D-
2017 BE30JPL Sentry18332096-210054.6e-07-7.03-7.150JPL #2 for the day: "Analysis based on 23 observations spanning 3.9335 days (2017-Jan-27.53064 to 2017-Jan-31.464189)." Diameter approximately 0.019 km. from mean, weighted H=26.3.
NEODyS17002096-210052.31e-07-7.35-7.360NEODyS: "Based on 23 optical observations (of which 0 are rejected as outliers) from 2017-01-27.531 to 2017-01-31.465."
2017 BD6JPL Sentry19012083-209021.3e-07-8.82-9.080JPL #2 for the day: "Analysis based on 16 observations spanning 5.1967 days (2017-Jan-26.38633 to 2017-Jan-31.583044)." Diameter approximately 0.007 km. from mean, weighted H=28.6.
NEODyS17002083-211659.19e-07-7.99-8.20NEODyS: "Based on 18 optical observations (of which 0 are rejected as outliers) from 2017-01-26.387 to 2017-01-31.584."
2017 AK3NEODyS1700R 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 2 February '17

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

1952Generated Traffic Report
1901Noted that JPL Sentry has updated its 2017 BD6 risk assessment - see above
Noted that JPL Sentry has reposted 2017 BF30 as an impact risk - see above
1833Noted that JPL Sentry has updated its 2017 BE30 risk assessment - see above
Noted that JPL Sentry has updated its 2017 BW30 risk assessment - see above
1730Noted that JPL Sentry has updated its 2017 BE30 risk assessment - see above
Noted that JPL Sentry has removed 2017 BF30 as an impact risk - see above
Noted that JPL Sentry has updated its 2017 BO32 risk assessment - see above
Noted that JPL Sentry has updated its 2017 BW30 risk assessment - see above
1700Noted that NEODyS has removed 2017 AK3 as an impact risk - see above
Noted that JPL Sentry has updated its 2017 BD6 risk assessment - see above
Noted that NEODyS has updated its 2017 BD6 risk assessment - see above
Noted that NEODyS has updated its 2017 BE30 risk assessment - see above
Noted that NEODyS has removed 2017 BF30 as an impact risk - see above
Noted that NEODyS has updated its 2017 BL30 risk assessment - see above
Noted that NEODyS has updated its 2017 BO32 risk assessment - see above
Noted that NEODyS has updated its 2017 BW30 risk assessment - see above
Grabbed MPEC 2017-C16 - Daily Orbit Update - see above
Grabbed MPEC 2017-C17 - 2004 AY1 - see above
Grabbed MPEC 2017-C18 - 2012 UU136 - see above
Grabbed MPEC 2017-C19 - 2016 FS6 - see above