Meteor seen from both Albuquerque and El Paso 5 May 2004. 
Credit: Sandia Labs & Jim Gamble

From A/CC's old online publication, the 5 May 2004 edition of Major News About Minor Objects, this is our composite from all-sky imagery from Sandia National Labs in Albuquerque, N.M. and Jim Gamble in El Paso, Texas, showing a meteor that fell between them that morning. On the Minor Planet Mailing list yesterday, Thomas Dorman noted the passing of fireball research pioneer Dick Spalding of Sandia Labs, and also indicates that Jim Gamble has passed. You can see more imagery from their work here and here (sorry, but those pages are plagued by old HTML and stale links). Image credit: Sandia Labs & Jim Gamble.

Contents  on 11 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 11 February '17

Four objects reported inside ten LD

Four minor objects are known to be within ten lunar distances (LD) of Earth today. Nearest is NHATS target 2017 BG30, which heads out from 4.65 to 5.28 LD.

Earth passage I D ~Size Distance Today  Notes
2.48 LD Feb. 52017 BG30 4 m  4.65 to 5.28 LD NHATS target
3.36 LD Feb. 82017 BM93 16 m  6.13 to 8.25 LD
3.57 LD Feb. 42017 CX1 8 m  7.07 to 7.90 LD NHATS target
4.64 LD Feb. 172017 BW 70 m  7.32 from 8.22 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 - DOU
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 2144 UTC with first follow-up for approaching NHATS target 2017 CP1 (5.93 days added to 1.85-day discovery arc) in today's DOU MPEC along with follow-up for inbound radar/NHATS target 2017 BW and astrometry from early last month for 2017 AE3.

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 11 February '17

The MPC's NEO Confirmation Page has 48 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 48 objects listed. Of these, ten were "one nighters." The Tracking News counted a total of 60 listings on the NEOCP on this day.

New MPECs  on 11 February '17

Minor Planet Electronic Circulars

There were two MPECs posted this day from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2017-C79 - "23:58 UT" - Comet 73P-BT/Schwassmann-Wachmann

<< DOU on 11 Feb. '17 >>  MPEC 2017-C78 - "13:04 UT" - Daily Orbit Update

Observers  on 11 February '17

A total of 21 observers appeared in this day's MPECs.

CodeObserver / observatory
349Ageo Obs. in Japan, 1 in MPEC 2017-C79 -- 73P-BT
H21Astronomical Research Obs. Westfield in Illinois, 19 in MPEC 2017-C78 -- 2017 BW, 2017 BQ91, 2017 AE3, 2016 YM4, 2009 HF88, 2001 QE34, 40267, 153951, 141018, 138846, 137925, 11398, 5653, 5626, 5131, 4179, 3103, 1627, 1036
W97Atacama Desert Obs. in Chile, 1 in MPEC 2017-C79 -- 73P-BT
T05ATLAS Haleakala in Hawaii, 1 in MPEC 2017-C78 -- 5653
T08ATLAS Mauna Loa in Hawaii, 1 in MPEC 2017-C78 -- 5653
I47Auger Obs. in Argentina, 1 in MPEC 2017-C79 -- 73P-BT
Q68Blue Mountains Obs. in New South Wales, 1 in MPEC 2017-C78 -- 106589
W96Campo Catino Austral Obs. in Chile, 1 in MPEC 2017-C79 -- 73P-BT
160Castelmartini Obs. in Italy, 11 in MPEC 2017-C78 -- 2016 WJ1, 2016 PZ66, 481817, 452389, 378610, 24445, 7341, 5836, 2102, 1620, 433
A77Chante-Perdrix Obs. in France, 1 in MPEC 2017-C79 -- 73P-BT
695^Spacewatch via Kitt Peak Natl. Obs. (KPNO) in Arizona, 11 in MPEC 2017-C78 -- 2017 BS31, 2017 BR31, 2017 BN3, 2017 BL30, 2017 AP20, 2016 YZ, 2016 WF9, 2016 UJ31, 2015 FJ36, 2001 DF47, 364136
Q63LCOGT Siding Spring A in New South Wales, 1 in MPEC 2017-C78 -- 192559
Q64LCOGT Siding Spring B in New South Wales, 1 in MPEC 2017-C78 -- 2011 EP51
K93LCOGT Sutherland C in South Africa, 1 in MPEC 2017-C78 -- 192559
H01Magdalena Ridge Obs. (MRO) in New Mexico, 2 in MPEC 2017-C78 -- 2017 CP1, 2017 BL30
F51Pan-STARRS 1 (PS1) in Hawaii, 4 in MPEC 2017-C78 -- 2013 LB1, 2005 EY223, 2002 EM6, 189973
D29Purple Mtn. Obs. Xuyi Station in China, 4 in MPEC 2017-C78 -- 2012 BB124, 89830, 452389, 5131
W25RMS Obs., 2 in MPEC 2017-C78 -- 2017 BM3, 2017 BL3
G39ROAD in Chile, 1 in MPEC 2017-C79 -- 73P-BT
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2017-C78 -- 5693
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2017-C78 -- 2017 BT, 2016 XZ23
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 11 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 BL30JPL Sentry16542029-205266.2e-05-2.95-2.950JPL: "Analysis based on 116 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.

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 11 February '17

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

0017 2/12Grabbed MPEC 2017-C79 - Comet 73P-BT/Schwassmann-Wachmann - see above
2144Generated Traffic Report
1654Noted that JPL Sentry has updated its 2017 BL30 risk assessment - see above
Grabbed MPEC 2017-C78 - Daily Orbit Update - see above