Contents  on 14 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 14 February '17

Three objects reported inside ten LD

Three Solar-System small bodies are reported to be less than ten lunar distances (LD) from our home world today. Nearest is radar/NHATS target 2017 BW, moving in from 5.76 to 5.18 LD. Further out, NHATS target 2017 CX1 departs from our ten-LD traffic reporting "bubble," slipping off from 9.63 to 10.52 LD.

Earth passage I D ~Size Distance Today  Notes
2.48 LD Feb. 52017 BG30 4 m  6.60 to 7.28 LD NHATS target
3.57 LD Feb. 42017 CX1 8 m  9.63 to 10.52 LD exits ten LD, NHATS target
4.64 LD Feb. 172017 BW 70 m  5.18 from 5.76 LD radar/NHATS target - DOU
Approaching (sorted by 10-LD bubble entry date)
3.58 LD Feb. 242017 CP1 42 m  < 10 LD tomorrow, NHATS target - DOU
2.37 LD Feb. 232017 BY93 83 m  < 10 LD Feb. 21, 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

This report was generated at 1900 UTC with follow-up in today's DOU MPEC for 2017 BW, NHATS target 2017 CP1, which enters the bubble tomorrow, and approaching risk-listed 2017 BY93, plus second follow-up from two weeks ago for 2016 YD8, adding 35.07 days to its previous 7.06-day observation arc.

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 14 February '17

The MPC's NEO Confirmation Page has 49 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 49 objects listed. Of these, seventeen were "one nighters." So far The Tracking News has counted a total of 53 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 14 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 14 Feb. '17 >>  MPEC 2017-C86 - "13:04 UT" - Daily Orbit Update

Observers  on 14 February '17

A total of 22 observers appear in today's MPEC.

CodeObserver / observatory
T05ATLAS Haleakala in Hawaii, 9 in MPEC 2017-C86 -- 2017 BW, 2016 UU80, 96590, 34613, 5693, 5131, 4179, 3103, 1627
160Castelmartini Obs. in Italy, 3 in MPEC 2017-C86 -- 2016 PR8, 326683, 203217
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 8 in MPEC 2017-C86 -- 2017 CQ1, 2017 CJ1, 2017 BY93, 2017 BV6, 2017 BS31, 2017 BR31, 2017 BL6, 2017 BL32
113Drebach Obs. in Germany, 5 in MPEC 2017-C86 -- 2017 CP1, 2016 UU80, 2011 WO41, 2006 WS1, 2001 QE34
F652Lothar Kurtze in Germany via Faulkes Telescope North in Hawaii, 1 in MPEC 2017-C86 -- 2017 CP1
J95Great Shefford Obs. in England, 2 in MPEC 2017-C86 -- 2017 BT93, 2017 BL30
Q62|Sergio Foglia in Italy via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-C86 -- 2017 BL30
W86LCOGT Cerro Tololo B in Chile, 1 in MPEC 2017-C86 -- 2017 BY93
K93LCOGT Sutherland C in South Africa, 1 in MPEC 2017-C86 -- 2017 BY93
J69North Obs. in England, 2 in MPEC 2017-C86 -- 2017 CP1, 2017 BW
Z80Northolt Branch Obs. in England, 1 in MPEC 2017-C86 -- 2017 CP1
Z48Northolt Branch Obs. 2 Shepherd's Bush in England, 4 in MPEC 2017-C86 -- 2016 UU80, 2013 GL8, 2011 WO41, 349507
F51Pan-STARRS 1 (PS1) in Hawaii, 10 in MPEC 2017-C86 -- 2016 XZ23, 2015 FJ36, 2003 CH11, 52761, 467963, 415027, 414903, 351545, 7341, 1221
D29Purple Mtn. Obs. Xuyi Station in China, 6 in MPEC 2017-C86 -- 2013 NX23, 2006 UM, 85804, 347813, 203471, 11398
071Rhozen Obs. in Bulgaria, 1 in MPEC 2017-C86 -- 376707
K61Rokycany Obs. in the Czech Republic, 2 in MPEC 2017-C86 -- 2017 BQ31, 2017 BL3
G40%program code "%" (14) via Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-C86 -- 2017 CP1
291Spacewatch 1.8m telescope in Arizona, 6 in MPEC 2017-C86 -- 2017 CW1, 2017 BR31, 2017 BL6, 2017 BE3, 2016 UM41, 2016 NG33
W34Squirrel Valley Obs. in North Carolina, 3 in MPEC 2017-C86 -- 2001 QE34, 443103, 5131
I52Steward Obs. Mt. Lemmon Station in Arizona, 2 in MPEC 2017-C86 -- 2017 BN32, 2017 BM31
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 3 in MPEC 2017-C86 -- 2017 AQ20, 2016 YD8, 2016 MK1
C51WISE in Earth polar orbit, 1 in MPEC 2017-C86 -- 54789
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 14 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 BY93NEODyS2233205711.12e-06-4.71-4.710NEODyS: "Based on 37 optical observations (of which 0 are rejected as outliers) from 2017-01-26.500 to 2017-02-14.166."
JPL Sentry17002057-207923.5e-06-4.21-4.220JPL: "Analysis based on 37 observations spanning 18.665 days (2017-Jan-26.49954 to 2017-Feb-14.16476)." Diameter approximately 0.083 km. from mean, weighted H=23.1.
2017 BL30NEODyS22332029-2094132.13e-04-2.40-2.40NEODyS: "Based on 125 optical observations (of which 0 are rejected as outliers) from 2017-01-28.379 to 2017-02-14.461."
JPL Sentry17002029-205264.1e-05-3.13-3.130JPL: "Analysis based on 125 observations spanning 17.082 days (2017-Jan-28.37792 to 2017-Feb-14.46008)." 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 14 February '17

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

2233Noted that NEODyS has updated its 2017 BL30 risk assessment - see above
Noted that NEODyS has updated its 2017 BY93 risk assessment - see above
1900Generated Traffic Report
1700Noted that JPL Sentry has updated its 2017 BL30 risk assessment - see above
Noted that JPL Sentry has updated its 2017 BY93 risk assessment - see above
Grabbed MPEC 2017-C86 - Daily Orbit Update - see above