Contents  on 6 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 6 February '17

Eleven objects reported inside ten LD

Eleven asteroids are reported within ten lunar distances (LD) of our planet today. Closest is NHATS target 2017 BG30, which is outbound from 2.50 to 2.69 LD. Newly announced 2017 CX1 moves out from 3.80 to 4.23 LD and 2017 CR comes its closest to Earth this time around -- 4.27 LD at 0348 UTC. Further away, two objects depart from our traffic reporting zone: intruder 2017 BS32 flies off from 8.08 to 10.64 LD and NHATS target 2017 BB7 from 8.94 to 10.47 LD.

Earth passage I D ~Size Distance Today  Notes
0.42 LD Feb. 22017 BS32 11 m  8.08 to 10.64 LD exits ten LD, intruder
1.03 LD Jan. 312017 BJ30 16 m  7.71 to 9.00 LD NHATS target
2.48 LD yesterday2017 BG30 4 m  2.50 to 2.69 LD NHATS target
2.97 LD Jan. 312017 BB7 9 m  8.94 to 10.47 LD exits ten LD, NHATS target
3.36 LD Feb. 82017 BM93 16 m  5.57 from 7.62 LD DOU
3.56 LD Feb. 42017 CX1 8 m  3.80 to 4.23 LD NEW - MPEC
4.27 LD today2017 CR 17 m  4.27 LD Earth closest at 0348 UTC
4.84 LD Feb. 12017 BN92 25 m  7.86 to 9.02 LD DOU
6.56 LD tomorrow2017 BQ6 178 m  6.60 from 7.30 LD DOU
7.10 LD yesterday2013 FK 78 m  7.12 to 7.52 LD
8.64 LD yesterday2017 BK30 12 m  8.64 to 9.01 LD risk

This report was generated at 2112 UTC with new discovery 2017 CX1 (MPEC) and with first follow-up for outbound 2017 BN92 in today's DOU MPEC along with continuing follow-up for inbound 2017 BM93 and 2017 BQ6, approaching risk-listed 2017 CS and radar/NHATS target 2017 BW, and departed 2017 BQ30 and NHATS target 2017 BY.

Approaching (sorted by 10-LD bubble entry date)
4.64 LD Feb. 172017 BW 70 m  < 10 LD Feb. 9, radar/NHATS target - DOU
3.6   LD Feb. 242017 CP1 41 m  < 10 LD Feb. 15, uncertainty +/- 2.7833 hours
2.4   LD Feb. 232017 BY93 81 m  < 10 LD Feb. 21, uncertainty +/- 1.8167 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 447 m  < 10 LD May 26, uncertainty +/- 2.6167 hours, risk - 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. 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 6 February '17

The MPC's NEO Confirmation Page has 79 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 79 objects listed. Of these, 42 were "one nighters." So far The Tracking News has counted a total of 91 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 6 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-C69 - "18:57 UT" - 2017 CX1


MPEC 2017-C68 - "18:53 UT" - 2017 CW1


<< DOU on 6 Feb. '17 >>  MPEC 2017-C67 - "13:05 UT" - Daily Orbit Update


MPEC 2017-C66 - "11:32 UT" - 2005 QB5


MPEC 2017-C65 - "03:33 UT" - 2015 EN7

Observers  on 6 February '17

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

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 22 in MPEC 2017-C67 -- 2017 BZ5, 2017 BX6, 2017 BW, 2017 BV93, 2017 BQ31, 2017 BP31, 2017 BP30, 2017 BO3, 2017 BN32, 2017 BM93, 2017 BL6, 2017 BL30, 2017 BL3, 2017 BK92, 2017 AP20, 2017 AH13, 2017 AF5, 2016 YN, 2016 UU80, 2016 PZ66, 2016 NV, 96590
T05ATLAS Haleakala in Hawaii, 9 in MPEC 2017-C67 -- 481904, 438955, 265482, 13651, 5693, 4179, 3103, 1627, 887
160Castelmartini Obs. in Italy, 15 in MPEC 2017-C67 -- 2017 AF5, 2015 BN509, 2007 VM184, 2003 CR1, 481904, 475665, 438955, 370307, 310842, 25916, 153951, 11398, 4055, 3103, 1864
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 17 in MPECs 2017-C66, 2017-C67 & 2017-C68 -- 2017 CW1, 2017 CM1, 2017 BY, 2017 BX32, 2017 BW30, 2017 BV6, 2017 BU93, 2017 BU31, 2017 BT32, 2017 BR31, 2017 BQ30, 2017 BM92, 2017 BL32, 2017 BF29, 2017 BD30, 2017 BC30, 2005 QB5
J95Great Shefford Obs. in England, 4 in MPECs 2017-C67 & 2017-C69 -- 2017 CX1, 2017 BQ6, 2017 BL30, 2008 SD
H15ISON New Mexico Obs. in New Mexico, 1 in MPEC 2017-C67 -- 3103
H06iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2017-C67 -- 2017 BL30
I89'Steven M. Tilley in Louisiana via iTelescope Obs. Nerpio in Spain, 1 in MPEC 2017-C67 -- 2017 BL30
Q62|Sergio Foglia in Italy via iTelescope Obs. Siding Spring in New South Wales, 4 in MPECs 2017-C67 & 2017-C69 -- 2017 CX1, 2017 CS, 2017 BW, 2017 BL30
950.Ovidiu Vaduvescu via La Palma in the Canary Islands, 2 in MPEC 2017-C67 -- 2013 AW60, 2001 QB34
W86LCOGT Cerro Tololo B in Chile, 1 in MPEC 2017-C65 -- 2015 EN7
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2017-C69 -- 2017 CX1
G96Mt. Lemmon Survey (MLS) in Arizona, 13 in MPECs 2017-C67, 2017-C68 & 2017-C69 -- 2017 CX1, 2017 CW1, 2017 CQ, 2017 AH13, 2016 YQ8, 2016 YN4, 2015 BG4, 2014 KU76, 2003 UF22, 481543, 36017, 143947, 10165
J69North Obs. in England, 1 in MPEC 2017-C67 -- 2017 BQ6
F51Pan-STARRS 1 (PS1) in Hawaii, 3 in MPECs 2017-C65, 2017-C66 & 2017-C67 -- 2015 EN7, 2005 QB5, 152667
W25RMS Obs., 6 in MPEC 2017-C67 -- 2017 BQ6, 2017 BN92, 2017 BM3, 2017 BL3, 85990, 433
H36Sandlot Obs. in Kansas, 1 in MPEC 2017-C69 -- 2017 CX1
G40!M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-C67 -- 2017 BL30
691Spacewatch 0.9m telescope in Arizona, 3 in MPEC 2017-C67 -- 2017 CS, 2017 BM123, 2017 BL30
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2017-C68 -- 2017 CW1
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2017-C67 -- 438955
I52Steward Obs. Mt. Lemmon Station in Arizona, 1 in MPEC 2017-C68 -- 2017 CW1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 6 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 CH1NEODyS16442037-2104121.34e-06-2.34-2.770NEODyS: "Based on 31 optical observations (of which 0 are rejected as outliers) from 2017-01-15.641 to 2017-02-05.437."
2017 CSJPL Sentry1730R E M O V E DJPL: Risk listing removed at 1700 UTC.
NEODyS1644205911.08e-10-7.33-7.330NEODyS: "Based on 24 optical observations (of which 0 are rejected as outliers) from 2017-01-20.570 to 2017-02-05.630."
2017 BY93NEODyS16442046-2096223.01e-06-4.30-4.690NEODyS: "Based on 21 optical observations (of which 0 are rejected as outliers) from 2017-01-26.500 to 2017-02-05.366."
2017 BO32NEODyS16442030-2112869.85e-06-4.98-5.650NEODyS: "Based on 18 optical observations (of which 0 are rejected as outliers) from 2017-01-29.398 to 2017-02-05.104."
2017 BW30NEODyS16442074-211591.49e-08-7.51-7.950NEODyS: "Based on 51 optical observations (of which 1 are rejected as outliers) from 2017-01-28.542 to 2017-02-06.173."
2017 BL30JPL Sentry16442029-207199.8e-04-1.76-1.761JPL: "Analysis based on 103 observations spanning 8.5596 days (2017-Jan-28.37792 to 2017-Feb-05.93753)." Diameter approximately 0.072 km. from mean, weighted H=23.4.
NEODyS16442029-2115291.03e-03-1.73-1.731NEODyS: "Based on 103 optical observations (of which 0 are rejected as outliers) from 2017-01-28.379 to 2017-02-05.938."

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 6 February '17

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

2112Generated Traffic Report
1900Grabbed MPEC 2017-C68 - 2017 CW1 - see above
Grabbed MPEC 2017-C69 - 2017 CX1 - see above
1730Noted that JPL Sentry has removed 2017 CS as an impact risk - see above
1644Noted that JPL Sentry has updated its 2017 BL30 risk assessment - see above
Noted that NEODyS has updated its 2017 BL30 risk assessment - see above
Noted that NEODyS has updated its 2017 BO32 risk assessment - see above
Noted that NEODyS has updated its 2017 BW30 risk assessment - see above
Noted that NEODyS has updated its 2017 BY93 risk assessment - see above
Noted that NEODyS has posted 2017 CH1 as an impact risk - see above
Noted that NEODyS has updated its 2017 CS risk assessment - see above
Grabbed MPEC 2017-C65 - 2015 EN7 - see above
Grabbed MPEC 2017-C66 - 2005 QB5 - see above
Grabbed MPEC 2017-C67 - Daily Orbit Update - see above