Contents  on 12 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 12 February '17

Five objects reported inside ten LD

There are five transient natural objects reported moving inside ten lunar distances (LD) of our planet today. Nearest is NHATS target 2017 BG30, outbound from 5.28 to 5.93 LD. Further away, 2017 BM93 leaves the ten LD space, traveling from 8.25 to 10.50 LD, as does newly announced 2017 CX31, slipping off from 10.00 to 11.97 LD.

Earth passage I D ~Size Distance Today  Notes
2.48 LD Feb. 52017 BG30 4 m  5.28 to 5.93 LD NHATS target
3.03 LD Feb. 72017 CX31 32 m  10.00 to 11.97 LD NEW, exits ten LD - MPEC
3.36 LD Feb. 82017 BM93 16 m  8.25 to 10.50 LD exits ten LD - DOU
3.57 LD Feb. 42017 CX1 8 m  7.90 to 8.76 LD NHATS target
4.64 LD Feb. 172017 BW 70 m  6.49 from 7.32 LD radar/NHATS target - DOU
Approaching (in 10-LD bubble entry date order)
3.57 LD Feb. 242017 CP1 41 m  < 10 LD Feb. 15, NHATS target
2.4   LD Feb. 232017 BY93 81 m  < 10 LD Feb. 21, uncertainty +/- 26 mins., 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
8.0   LD May 292017 CS 452 m  < 10 LD May 26, uncertainty +/- 1.6167 hours

This report was generated at 1914 UTC with new discovery 2017 CX31 (MPEC), and with first follow-up for departed 2017 CR (0.99 days added to 1.56-day discovery arc) in today's DOU MPEC, along with follow-up for outbound 2017 BM93 plus astrometry for inbound radar/NHATS target 2017 BW and for departed objects 2017 BQ6 and intruder 2017 BX, a NHATS target.

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 12 February '17

The MPC's NEO Confirmation Page has 41 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 41 objects listed. Of these, nine were "one nighters." So far The Tracking News has counted a total of 44 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 12 February '17

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.

MPEC 2017-C84 - "15:14 UT" - 2007 KD

<< DOU on 12 Feb. '17 >>  MPEC 2017-C83 - "13:04 UT" - Daily Orbit Update

MPEC 2017-C82 - "02:48 UT" - Comet C/2017 C1 (Neowise)

MPEC 2017-C81 - "01:01 UT" - 2017 CX31

MPEC 2017-C80 - "00:57 UT" - 2017 CY31

Observers  on 12 February '17

Sixteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 12 in MPEC 2017-C83 -- 2017 BW, 2017 BQ91, 2017 BL3, 2017 AH3, 2014 YN44, 452389, 349507, 141018, 5131, 4179, 3691, 3352
160Castelmartini Obs. in Italy, 8 in MPEC 2017-C83 -- 468583, 414960, 36236, 35396, 203217, 138846, 5131, 1627
703Catalina Sky Survey in Arizona, 1 in MPEC 2017-C81 -- 2017 CX31
958Dax Obs. in France, 1 in MPEC 2017-C81 -- 2017 CX31
H06#M. Suzuki in Japan via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2017-C81 -- 2017 CX31
H06|Hidetaka Sato in Japan via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2017-C81 -- 2017 CX31
695^Spacewatch via Kitt Peak Natl. Obs. (KPNO) in Arizona, 7 in MPECs 2017-C80, 2017-C81, 2017-C82 & 2017-C83 -- 2017 CY31, 2017 CX31, C/2017 C1, 2017 BP31, 2017 BK92, 2016 MK1, 1996 FS1
V37LCOGT Fort Davis in Texas, 1 in MPEC 2017-C82 -- C/2017 C1
T04LCOGT Haleakala OGG B#2 in Hawaii, 1 in MPEC 2017-C82 -- C/2017 C1
H01Magdalena Ridge Obs. (MRO) in New Mexico, 3 in MPECs 2017-C80, 2017-C81 & 2017-C82 -- 2017 CY31, 2017 CX31, C/2017 C1
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2017-C80 -- 2017 CY31
557Ondrejov Obs. in the Czech Republic, 2 in MPEC 2017-C83 -- 2017 BW, 3103
D29Purple Mtn. Obs. Xuyi Station in China, 6 in MPEC 2017-C83 -- 452389, 226198, 13651, 4179, 3352, 1627
W25RMS Obs., 1 in MPEC 2017-C81 -- 2017 CX31
204Schiaparelli Obs. in Italy, 8 in MPEC 2017-C83 -- 2017 CR, 2017 BX, 2017 BU, 2017 BQ6, 2017 BM93, 2017 BL30, 2016 PL1, 2013 GL8
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-C84 -- 2007 KD
C51WISE in Earth polar orbit, 1 in MPEC 2017-C82 -- C/2017 C1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 12 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 BL30NEODyS21002029-2104192.35e-04-2.36-2.360NEODyS #2 for the day: "Based on 119 optical observations (of which 0 are rejected as outliers) from 2017-01-28.379 to 2017-02-11.300."
JPL Sentry16512029-205266.1e-05-2.96-2.960JPL: "Analysis based on 119 observations spanning 13.921 days (2017-Jan-28.37792 to 2017-Feb-11.2991)." Diameter approximately 0.073 km. from mean, weighted H=23.3.
2016 WJ1NEODyS01002104-211554.44e-07-4.78-5.10NEODyS: "Based on 376 optical observations (of which 3 are rejected as outliers) from 2003-07-04.606 to 2016-12-15.993."

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 12 February '17

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

2100Noted that NEODyS has updated its 2017 BL30 risk assessment - see above
1914Generated Traffic Report
1651Noted that JPL Sentry has updated its 2017 BL30 risk assessment - see above
Grabbed MPEC 2017-C83 - Daily Orbit Update - see above
Grabbed MPEC 2017-C84 - 2007 KD - see above
0520Grabbed MPEC 2017-C82 - Comet C/2017 C1 (Neowise) - see above
0200Grabbed MPEC 2017-C81 - 2017 CX31 - see above
0100Noted that NEODyS has updated its 2016 WJ1 risk assessment - see above
Noted that NEODyS has updated its 2017 BL30 risk assessment - see above
Grabbed MPEC 2017-C80 - 2017 CY31 - see above