Contents  on 9 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 9 February '17

Six objects reported inside ten LD

Six Solar-System small bodies are known to be inside ten lunar distances (LD) of our planet today. Nearest are 2017 BM93, outbound from 3.38 to 4.33 LD, and NHATS target 2017 BG30, headed away from 3.52 to 4.06 LD. Much more distant 2013 FK leaves the ten LD space, slipping off from 9.58 to 10.99 LD, and radar/NHATS target 2017 BW enters, moving in from 10.17 to 9.18 LD.

Earth passage I D ~Size Distance Today  Notes
2.48 LD Feb. 52017 BG30 4 m  3.52 to 4.06 LD NHATS target
3.36 LD yesterday2017 BM93 16 m  3.38 to 4.33 LD
3.57 LD Feb. 42017 CX1 8 m  5.50 to 6.26 LD NHATS target
4.64 LD Feb. 172017 BW 70 m  9.18 from 10.17 LD enters ten LD, radar/NHATS target - DOU
6.57 LD Feb. 72017 BQ6 177 m  7.87 to 9.49 LD DOU
7.10 LD Feb. 52013 FK 78 m  9.58 to 10.99 LD exits ten LD

This report was generated at 1848 UTC with follow-up in today's DOU MPEC for 2017 BW and outbound 2017 BQ6.

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 +/- 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 9 February '17

The MPC's NEO Confirmation Page has 65 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 65 objects listed. Of these, 28 were "one nighters." So far The Tracking News has counted a total of 81 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 9 February '17

Minor Planet Electronic Circulars

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

<< DOU on 9 Feb. '17 >>  MPEC 2017-C75 - "13:06 UT" - Daily Orbit Update

MPEC 2017-C74 - "05:08 UT" - 2017 CP5

MPEC 2017-C73 - "05:04 UT" - 2017 CO5

Observers  on 9 February '17

Nineteen observers appear in today's MPECs.

CodeObserver / observatory
705"Kristie Nault via Apache Point Obs. in New Mexico, 4 in MPECs 2017-C74 & 2017-C75 -- 2017 CP5, 2017 BX6, 2017 BQ6, 2017 BK32
H21Astronomical Research Obs. Westfield in Illinois, 7 in MPEC 2017-C75 -- 2016 YV8, 2016 YU8, 2016 YN, 2016 WX9, 2013 YZ37, 2012 QR50, 2010 CM44
T08ATLAS Mauna Loa in Hawaii, 5 in MPEC 2017-C75 -- 2017 BW, 40267, 138846, 11398, 5626
160Castelmartini Obs. in Italy, 3 in MPEC 2017-C75 -- 2006 UM, 42286, 3352
703Catalina Sky Survey (CSS) in Arizona, 6 in MPEC 2017-C75 -- 40267, 265482, 22771, 143404, 5626, 3103
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 3 in MPEC 2017-C75 -- 2017 CJ1, 2017 BS, 2017 BM32
H06iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2017-C75 -- 2017 BL30
Q62|Sergio Foglia in Italy via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-C75 -- 2017 BW
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2017-C74 -- 2017 CP5
Z22MASTER IAC Obs. in the Canary Islands, 1 in MPEC 2017-C75 -- 141018
K95MASTER-II Sutherland in South Africa, 1 in MPEC 2017-C75 -- 3199
568_Marco Micheli on Mauna Kea in Hawaii, 1 in MPEC 2017-C73 -- 2017 CO5
G96Mt. Lemmon Survey (MLS) in Arizona, 11 in MPECs 2017-C74 & 2017-C75 -- 2017 CP5, 2017 BX6, 2014 DH23, 2005 YV55, 2003 EZ16, 477490, 420286, 386298, 22771, 154652, 3103
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPECs 2017-C73 & 2017-C74 -- 2017 CP5, 2017 CO5
D29Purple Mtn. Obs. Xuyi Station in China, 1 in MPEC 2017-C75 -- 265482
G40%program code "%" (14) via Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-C75 -- 163693
291Spacewatch 1.8m telescope in Arizona, 3 in MPECs 2017-C73, 2017-C74 & 2017-C75 -- 2017 CP5, 2017 CO5, 2017 BP31
I52Steward Obs. Mt. Lemmon Station in Arizona, 1 in MPEC 2017-C74 -- 2017 CP5
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 5 in MPEC 2017-C75 -- 2017 BY32, 2017 BU, 2017 BG32, 2017 AL4, 2016 VV2
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 9 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 Sentry17002029-205293.8e-04-2.17-2.170JPL: "Analysis based on 109 observations spanning 9.7700 days (2017-Jan-28.37792 to 2017-Feb-07.14791)." Diameter approximately 0.073 km. from mean, weighted H=23.3.
NEODyS17002029-2111257.15e-04-1.88-1.881NEODyS: "Based on 109 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 9 February '17

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

1848Generated Traffic Report
1700Noted that JPL Sentry has updated its 2017 BL30 risk assessment - see above
Noted that NEODyS has updated its 2017 BL30 risk assessment - see above
Grabbed MPEC 2017-C75 - Daily Orbit Update - see above
0530Grabbed MPEC 2017-C74 - 2017 CP5 - see above
0507Grabbed MPEC 2017-C73 - 2017 CO5 - see above