Contents  on 17 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 17 February '17

Four objects reported inside ten LD

There are four visitors reported within ten lunar distances (LD) of our home world today. Nearest is radar/NHATS target 2017 BW, which comes its closest to Earth this time around, reaching 4.64 LD at 0140 UTC.

Earth passage I D ~Size Distance Today  Notes
2.48 LD Feb. 52017 BG30 4 m  8.67 to 9.37 LD NHATS target
2.57 LD Feb. 102017 CF32 21 m  6.58 to 7.42 LD NHATS target - DOU
3.58 LD Feb. 242017 CP1 40 m  7.50 from 8.41 LD NHATS target - DOU
4.64 LD today2017 BW 69 m  4.64 LD radar/NHATS target, Earth closest at 0140 UTC

This report was generated at 1926 UTC with the recovery of distant 1999 XL136 and additional observation of outbound NHATS target 2017 CF32 in today's DOU MPEC, along with follow-up for inbound NHATS target 2017 CP1, approaching objects 2017 CS and 2017 BY93, and departed NHATS target 2017 BY, plus astrometry from last month for 2016 YD8.

Approaching (sorted by 10-LD bubble entry date)
2.37 LD Feb. 232017 BY93 81 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
7.9   LD May 292017 CS 451 m  < 10 LD May 26, uncertainty +/- 42 mins. - 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. "Distant" is used here to describe an object that has come within ten LD since A/CC began these traffic reports (2007) but is not presently so close. 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 17 February '17

The MPC's NEO Confirmation Page has 62 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 62 objects listed. Of these, 27 were "one nighters." So far The Tracking News has counted a total of 67 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 17 February '17

Minor Planet Electronic Circulars

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


<< DOU on 17 Feb. '17 >>  MPEC 2017-D12 - "13:04 UT" - Daily Orbit Update


MPEC 2017-D11 - "02:28 UT" - 2016 CA138


MPEC 2017-D10 - "02:11 UT" - 2017 CR32


MPEC 2017-D09 - "02:06 UT" - 2017 CQ32

Observers  on 17 February '17

A total of 30 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 21 in MPECs 2017-D10 & 2017-D12 -- 2017 CR32, 2017 CF32, 2017 BY, 2017 BW93, 2017 BT31, 2017 BO93, 2017 BH29, 2017 AN20, 2016 YY7, 2016 YE3, 2016 PR38, 2016 PL1, 2014 YN44, 2012 JS17, 2012 FK35, 2010 UD, 2010 AK, 1994 BB, 311321, 242147, 138175
T05ATLAS Haleakala in Hawaii, 14 in MPECs 2017-D11 & 2017-D12 -- 2017 BY93, 2016 SD, 2016 CA138, 2008 CA6, 2001 QE34, 2000 CE59, 54789, 370702, 310842, 22771, 143404, 10165, 5626, 4055
Q68Blue Mountains Obs. in New South Wales, 1 in MPEC 2017-D12 -- 2017 BY93
160Castelmartini Obs. in Italy, 8 in MPEC 2017-D12 -- 2016 UU80, 2013 GL8, 34613, 310842, 13651, 11398, 10165, 5693
703Catalina Sky Survey (CSS) in Arizona, 11 in MPECs 2017-D10 & 2017-D12 -- 2017 CR32, 2015 ME54, 2014 EW24, 2011 WO41, 2006 UM, 89830, 481904, 479325, 351545, 252558, 226198
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 6 in MPEC 2017-D12 -- 2017 CS, 2017 CG1, 2017 BW32, 2017 BM92, 2017 BM123, 2017 AC5
958Dax Obs. in France, 1 in MPEC 2017-D11 -- 2016 CA138
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2017-D10 -- 2017 CR32
Q60ISON Siding Spring Obs. in New South Wales, 1 in MPEC 2017-D12 -- 2017 AC5
Q62|Sergio Foglia in Italy via iTelescope Obs. Siding Spring in New South Wales, 2 in MPEC 2017-D12 -- 2017 BY93, 2017 BL30
246KLENOT in the Czech Republic, 11 in MPECs 2017-D10, 2017-D11 & 2017-D12 -- 2017 CR32, 2017 CP1, 2017 BU6, 2017 BU31, 2017 BL30, 2016 CA138, 2014 AD17, 2013 VC13, 2013 GL8, 2011 WO41, 2003 CR1
950.Ovidiu Vaduvescu via La Palma in the Canary Islands, 1 in MPEC 2017-D12 -- 2011 BF59
W85LCOGT Cerro Tololo A in Chile, 3 in MPEC 2017-D12 -- 2017 BY93, 2011 EP51, 265482
W86LCOGT Cerro Tololo B in Chile, 1 in MPEC 2017-D12 -- 192559
W87LCOGT Cerro Tololo C in Chile, 2 in MPEC 2017-D12 -- 2011 EP51, 192559
V37LCOGT Fort Davis in Texas, 1 in MPEC 2017-D12 -- 265482
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2017-D09 -- 2017 CQ32
B67Mirasteilas Obs. in Switzerland, 2 in MPEC 2017-D12 -- 2017 CP1, 2017 BY93
108Montelupo Obs. in Italy, 3 in MPEC 2017-D12 -- 2001 QE34, 11398, 4179
G96Mt. Lemmon Survey (MLS) in Arizona, 18 in MPECs 2017-D09 & 2017-D12 -- 2017 CQ32, 2017 CK1, 2017 BQ31, 2017 BK3, 2017 BD29, 2016 PR8, 2011 WO41, 2010 CM44, 2005 YV55, 481904, 480984, 457059, 378610, 354713, 226198, 6455, 3691, 1916
F51Pan-STARRS 1 (PS1) in Hawaii, 13 in MPECs 2017-D09, 2017-D10 & 2017-D12 -- 2017 CR32, 2017 CQ32, 2017 CG1, 2017 BQ31, 2017 BK3, 2017 AZ13, 2016 VY5, 2014 EW24, 1999 XL136, 333555, 198752, 5189, 1943
D29Purple Mtn. Obs. Xuyi Station in China, 2 in MPEC 2017-D12 -- 203471, 144411
L04ROASTERR-1 in Romania, 1 in MPEC 2017-D12 -- 2017 CP1
H36Sandlot Obs. in Kansas, 1 in MPEC 2017-D10 -- 2017 CR32
691Spacewatch 0.9m telescope in Arizona, 3 in MPEC 2017-D12 -- 2017 CN1, 2004 BD68, 3352
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2017-D10 -- 2017 CR32
I93St. Pardon de Conques Obs. in France, 2 in MPECs 2017-D10 & 2017-D11 -- 2017 CR32, 2016 CA138
J22Tacande Obs. in the Canary Islands, 1 in MPEC 2017-D12 -- 2016 CA138
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2017-D12 -- 2016 YD8, 2016 VS5
C42Xingming Obs. in China, 1 in MPEC 2017-D10 -- 2017 CR32
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 17 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.
0000NNN000

Object

Risk
Monitor
When
Noted
UTC
0000T0000
Year
Range

VI
#
000NN00
Prob
Cum
T0000
PS
Cum
T0000
PS
Max

T
S


Notes for Today's Latest Risk Assessments
2017 CM32NEODyS1707210622.5e-08-5.00-5.220NEODyS: "Based on 18 optical observations (of which 0 are rejected as outliers) from 2017-02-07.942 to 2017-02-16.452."
2017 BY93NEODyS17302057-207032.15e-08-6.55-6.790NEODyS: "Based on 86 optical observations (of which 0 are rejected as outliers) from 2017-01-26.500 to 2017-02-16.932."
JPL Sentry1707205714.9e-09-7.09-7.090JPL: "Analysis based on 86 observations spanning 21.432 days (2017-Jan-26.49954 to 2017-Feb-16.93117)." Diameter approximately 0.081 km. from mean, weighted H=23.1.
2017 BL30NEODyS17302029-2116141.89e-04-2.46-2.460NEODyS: "Based on 164 optical observations (of which 0 are rejected as outliers) from 2017-01-28.379 to 2017-02-16.819."
JPL Sentry17072029-205262.9e-05-3.28-3.280JPL: "Analysis based on 164 observations spanning 19.441 days (2017-Jan-28.37792 to 2017-Feb-16.8187)." 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 17 February '17

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

1926Generated Traffic Report
1730Noted that NEODyS has updated its 2017 BL30 risk assessment - see above
Noted that NEODyS has updated its 2017 BY93 risk assessment - see above
1707Noted 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
Noted that NEODyS has posted 2017 CM32 as an impact risk - see above
Grabbed MPEC 2017-D12 - Daily Orbit Update - see above
0329Grabbed MPEC 2017-D09 - 2017 CQ32 - see above
Grabbed MPEC 2017-D10 - 2017 CR32 - see above
Grabbed MPEC 2017-D11 - 2016 CA138 - see above