Contents  on 10 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 10 February '17

Five objects reported inside ten LD

There are five asteroids reported traveling less than ten lunar distances (LD) from our home world today. Closest is NHATS target 2017 BG30, which is outbound from 4.06 to 4.65 LD. Further away, 2017 BQ6 leaves our ten-LD traffic reporting "bubble," flying off from 9.49 to 11.44 LD.

Earth passage I D ~Size Distance Today  Notes
2.48 LD Feb. 52017 BG30 4 m  4.06 to 4.65 LD NHATS target
3.36 LD Feb. 82017 BM93 16 m  4.33 to 6.13 LD
3.57 LD Feb. 42017 CX1 8 m  6.26 to 7.07 LD NHATS target
4.64 LD Feb. 172017 BW 70 m  8.22 from 9.18 LD radar/NHATS target
6.57 LD Feb. 72017 BQ6 177 m  9.49 to 11.44 LD exits ten LD

This report was generated at 1851 UTC with the discovery of already departed 2017 CR5 (MPEC), which went past us at 8.27 LD on February 6th, and with follow-up in today's DOU MPEC for approaching objects 2017 CS and risk-listed 2017 BY93.

Approaching (sorted by 10-LD bubble entry date)
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 +/- 26 mins., risk - DOU
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
8.0   LD May 292017 CS 452 m  < 10 LD May 26, uncertainty +/- 1.6167 hours - DOU

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 10 February '17

The MPC's NEO Confirmation Page has 59 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 59 objects listed. Of these, 21 were "one nighters." So far The Tracking News has counted a total of 66 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 10 February '17

Minor Planet Electronic Circulars

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

<< DOU on 10 Feb. '17 >>  MPEC 2017-C77 - "13:06 UT" - Daily Orbit Update

MPEC 2017-C76 - "00:32 UT" - 2017 CR5

Observers  on 10 February '17

Twelve observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 6 in MPEC 2017-C77 -- 2017 BU, 2017 BK3, 2017 BF30, 2016 YU10, 2015 FD35, 2014 YQ15
T05ATLAS Haleakala in Hawaii, 5 in MPEC 2017-C77 -- 96590, 4179, 3352, 3103, 1627
695^Spacewatch via Kitt Peak Natl. Obs. (KPNO) in Arizona, 10 in MPEC 2017-C77 -- 2017 CS, 2017 CO5, 2017 CN1, 2017 CH1, 2017 BY93, 2017 BQ93, 2017 BP31, 2017 BM123, 2017 BL3, 2016 XM
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2017-C76 -- 2017 CR5
C94MASTER-II Tunka in Russia, 1 in MPEC 2017-C77 -- 433
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2017-C76 -- 2017 CR5
F51Pan-STARRS 1 (PS1) in Hawaii, 5 in MPEC 2017-C77 -- 2017 CO5, 2015 YE18, 394392, 163902, 11066
071Rhozen Obs. in Bulgaria, 1 in MPEC 2017-C77 -- 85804
Y00SONEAR in Brazil, 1 in MPEC 2017-C77 -- 1864
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2017-C77 -- 2016 WS9
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2017-C77 -- 2016 WS9
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 4 in MPEC 2017-C77 -- 2017 BM6, 2016 YT8, 2016 XH2, 2016 WF9
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 10 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.





Notes for Today's Latest Risk Assessments
2017 CH1JPL Sentry1718204412.3e-10-5.76-5.760JPL: "Analysis based on 40 observations spanning 25.853 days (2017-Jan-15.64059 to 2017-Feb-10.49404)." Diameter approximately 0.900 km. from mean, weighted H=17.9.
NEODyS1718204414.59e-10-5.47-5.470NEODyS: "Based on 40 optical observations (of which 0 are rejected as outliers) from 2017-01-15.641 to 2017-02-10.495."
2017 BY93JPL Sentry17182057-207963.4e-06-4.29-4.340JPL: "Analysis based on 26 observations spanning 14.885 days (2017-Jan-26.49954 to 2017-Feb-10.3842)." Diameter approximately 0.080 km. from mean, weighted H=23.1.
NEODyS17182057-208561.4e-06-4.68-4.730NEODyS: "Based on 26 optical observations (of which 0 are rejected as outliers) from 2017-01-26.500 to 2017-02-10.385."
2015 HV182JPL Sentry05312017-21135097.1e-07-4.14-5.450JPL: "Analysis based on 9 observations spanning .99953 days (2015-Apr-18.27618 to 2015-Apr-19.27571)." Diameter approximately 0.153 km. from mean, weighted H=21.7.
2008 EL68NEODyS17182024-2111423.26e-07-8.00-8.640NEODyS: "Based on 8 optical observations (of which 0 are rejected as outliers) from 2008-03-06.408 to 2008-03-06.480."

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 10 February '17

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

1851Generated Traffic Report
1718Noted that NEODyS has updated its 2008 EL68 risk assessment - see above
Noted that JPL Sentry has updated its 2017 BY93 risk assessment - see above
Noted that NEODyS has updated its 2017 BY93 risk assessment - see above
Noted that JPL Sentry has updated its 2017 CH1 risk assessment - see above
Noted that NEODyS has updated its 2017 CH1 risk assessment - see above
Grabbed MPEC 2017-C77 - Daily Orbit Update - see above
0531Noted that JPL Sentry has updated its 2015 HV182 risk assessment - see above
0111Grabbed MPEC 2017-C76 - 2017 CR5 - see above