Contents  on 8 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 8 February '17

Seven objects reported inside ten LD

Today seven asteroidal objects are reported to be within ten lunar distances (LD) of Earth. Nearest is NHATS target 2017 BG30, traveling outward from 3.04 to 3.52 LD, and 2017 BM93 comes its closest to our planet on this passage, reaching 3.36 LD at 2036 UTC. Further away, two objects leave our ten-LD traffic reporting sphere: 2017 CR zooms off from 8.30 to 11.79 LD while risk-listed 2017 BK30 passes from 9.92 to 11.25 LD. Radar/NHATS target 2017 BW penetrates the sphere tomorrow.

Earth passage I D ~Size Distance Today  Notes
2.48 LD Feb. 52017 BG30 4 m  3.04 to 3.52 LD NHATS target
3.36 LD today2017 BM93 16 m  3.36 LD Earth closest at 2036 UTC
3.57 LD Feb. 42017 CX1 8 m  4.82 to 5.50 LD NHATS target - DOU
4.27 LD Feb. 62017 CR 17 m  8.30 to 11.79 LD exits ten LD
6.56 LD yesterday2017 BQ6 177 m  6.81 to 7.87 LD
7.10 LD Feb. 52013 FK 78 m  8.38 to 9.58 LD
8.64 LD Feb. 52017 BK30 12 m  9.92 to 11.25 LD exits ten LD, risk

This report was generated at 2014 UTC with first follow-up for outbound NHATS target 2017 CX1 in today's DOU MPEC along with follow-up for 2017 BW and departed objects 2017 BN92 and dim NHATS target 2016 XR23 (37.05 days added to 11.91-day observing arc).

Approaching (sorted by 10-LD bubble entry date)
4.64 LD Feb. 172017 BW 70 m  < 10 LD tomorrow, radar/NHATS target - DOU
3.6   LD Feb. 242017 CP1 41 m  < 10 LD Feb. 15, uncertainty +/- 2.7833 hours, NHATS target
2.4   LD Feb. 232017 BY93 81 m  < 10 LD Feb. 21, uncertainty +/- 1.0000 hours, risk
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
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
8.1   LD May 292017 CS 453 m  < 10 LD May 26, uncertainty +/- 2.2833 hours

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 8 February '17

The MPC's NEO Confirmation Page has 78 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 78 objects listed. Of these, 34 were "one nighters." So far The Tracking News has counted a total of 85 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 8 February '17

Minor Planet Electronic Circulars

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

<< DOU on 8 Feb. '17 >>  MPEC 2017-C72 - "13:05 UT" - Daily Orbit Update

Observers  on 8 February '17

Ten observers appear in today's MPEC.

CodeObserver / observatory
705"Kristie Nault via Apache Point Obs. in New Mexico, 24 in MPEC 2017-C72 -- 2017 CX1, 2017 CM1, 2017 BX6, 2017 BX5, 2017 BW, 2017 BV93, 2017 BU6, 2017 BT93, 2017 BQ91, 2017 BQ31, 2017 BO3, 2017 BN92, 2017 BN32, 2017 BL92, 2017 BL32, 2017 BK32, 2017 BD29, 2017 AZ13, 2017 AQ20, 2017 AL4, 2016 YM1, 2015 FG37, 2014 DJ112, 2008 SD
H21Astronomical Research Obs. Westfield in Illinois, 12 in MPEC 2017-C72 -- 2017 BX6, 2017 BW, 2017 BV93, 2017 BV6, 2017 BU31, 2017 BP31, 2017 BO3, 2017 BN32, 2017 BE29, 2017 BD29, 2017 AP20, 2016 QC84
T08ATLAS Mauna Loa in Hawaii, 1 in MPEC 2017-C72 -- 1036
160Castelmartini Obs. in Italy, 1 in MPEC 2017-C72 -- 5587
703Catalina Sky Survey (CSS) in Arizona, 2 in MPEC 2017-C72 -- 370307, 141018
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPEC 2017-C72 -- 380981, 1916
Q11Shinshiro Obs., 1 in MPEC 2017-C72 -- 4954
G40!M. Kumrucu-Lohmiller in Massachusetts via Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-C72 -- 2017 BL30
G40%program code "%" (14) via Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-C72 -- 2017 BW
W887program code 7 via Chile Obs. in Chile, 1 in MPEC 2017-C72 -- 2017 BW
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2017-C72 -- 2017 BP31, 2016 XR23
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 8 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.





Notes for Today's Latest Risk Assessments
2017 CH1NEODyS16002044-211692.39e-06-2.21-2.291NEODyS: "Based on 38 optical observations (of which 0 are rejected as outliers) from 2017-01-15.641 to 2017-02-06.233."
2017 CSNEODyS1600R E M O V E D-
2017 BY93NEODyS16002045-2084191.53e-06-4.61-4.740NEODyS: "Based on 23 optical observations (of which 0 are rejected as outliers) from 2017-01-26.500 to 2017-02-07.319."
2017 BL30JPL Sentry17072029-205281.0e-03-1.73-1.741JPL: "Analysis based on 107 observations spanning 9.7700 days (2017-Jan-28.37792 to 2017-Feb-07.14791)." Diameter approximately 0.072 km. from mean, weighted H=23.4.
NEODyS16002029-2102271.11e-03-1.70-1.71NEODyS: "Based on 107 optical observations (of which 0 are rejected as outliers) from 2017-01-28.379 to 2017-02-07.149."

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 8 February '17

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

2014Generated Traffic Report
1707Noted that JPL Sentry has updated its 2017 BL30 risk assessment - see above
1600Noted that NEODyS has updated its 2017 BL30 risk assessment - see above
Noted that NEODyS has updated its 2017 BY93 risk assessment - see above
Noted that NEODyS has updated its 2017 CH1 risk assessment - see above
Noted that NEODyS has removed 2017 CS as an impact risk - see above
Grabbed MPEC 2017-C72 - Daily Orbit Update - see above