Contents  on 3 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 3 February '17

Eight objects reported inside ten LD

Eight minor objects are reported inside ten lunar distances (LD) of Earth today. Closest is intruder 2017 BS32, which started the day at 0.57 LD from our home world and proceeded to pass the Moon at 0.75 LD at 0047 UTC on its way out of the Earth-Moon system and out of Earth's sphere of gravitational influence (SOI), finishing the day 2.98 LD from us.

Much further away, risk-listed 2017 BK30 enters our ten-LD reporting sphere, moving in from 11.02 to 9.74 LD.

On approach next, 2017 BQ6 comes inside ten LD tomorrow, as does newly announced 2017 BM93.

Earth passage I D ~Size Distance Today  Notes
0.42 LD yesterday2017 BS32 12 m  0.57 to 2.98 LD intruder, exits Earth SOI, Moon closest 0.75 LD at 0047 UTC
1.03 LD Jan. 312017 BJ30 16 m  3.89 to 5.15 LD NHATS target
2.48 LD Feb. 52017 BG30 4 m  2.72 from 3.10 LD NHATS target - DOU
2.97 LD Jan. 312017 BB7 9 m  4.69 to 6.01 LD NHATS target
4.84 LD Feb. 12017 BN92 25 m  5.21 to 5.89 LD
5.57 LD yesterday2017 BB6 13 m  5.85 to 6.84 LD
7.10 LD Feb. 52013 FK 78 m  7.87 from 8.89 LD
8.64 LD Feb. 52017 BK30 12 m  9.74 from 11.02 LD enters ten LD, risk
Approaching
3.36 LD Feb. 82017 BM93 15 m  < 10 LD tomorrow, NEW - MPEC
4.64 LD Feb. 172017 BW 70 m  < 10 LD Feb. 9, radar/NHATS target - DOU
6.57 LD Feb. 72017 BQ6 183 m  < 10 LD tomorrow - DOU

This report was generated at 1922 UTC with the discovery of 2017 BM93 (MPEC) and with follow-up in today's DOU MPEC for inbound NHATS target 2017 BG30, approaching 2017 BQ6 and radar/NHATS target 2017 BW, and departed NHATS targets 2017 BS5 (which returns in July) and risk-listed 2017 AP4.



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 3 February '17

The MPC's NEO Confirmation Page has 110 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 110 objects listed. Of these, 46 were "one nighters." So far The Tracking News has counted a total of 140 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 3 February '17

Minor Planet Electronic Circulars

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


MPEC 2017-C34 - "18:55 UT" - 2014 YR


<< DOU on 3 Feb. '17 >>  MPEC 2017-C33 - "13:07 UT" - Daily Orbit Update


MPEC 2017-C32 - "02:24 UT" - 2017 BW93


MPEC 2017-C31 - "02:21 UT" - 2017 BQ93


MPEC 2017-C30 - "02:18 UT" - 2017 BP93


MPEC 2017-C29 - "02:15 UT" - 2017 CE


MPEC 2017-C28 - "02:12 UT" - 2017 BV93


MPEC 2017-C27 - "02:09 UT" - 2017 BU93


MPEC 2017-C26 - "02:06 UT" - 2017 BT93


MPEC 2017-C25 - "02:03 UT" - 2017 BS93


MPEC 2017-C24 - "02:00 UT" - 2017 BR93


MPEC 2017-C23 - "01:57 UT" - 2017 BO93


MPEC 2017-C22 - "01:53 UT" - 2017 BN93


MPEC 2017-C21 - "01:49 UT" - 2017 BM93


MPEC 2017-C20 - "01:45 UT" - 2017 BL93

Observers  on 3 February '17

A total of 29 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 12 in MPEC 2017-C33 -- 2017 BT31, 2017 BQ6, 2017 BO3, 2017 BB30, 2017 AT4, 2017 AR4, 2017 AP20, 2017 AO13, 2016 YF11, 2016 QD, 2013 EP41, 2007 BX48
T05ATLAS Haleakala in Hawaii, 8 in MPEC 2017-C33 -- 2017 BM3, 2016 PR8, 2015 ME54, 2011 WO41, 252558, 226198, 10115, 5653
Z84Calar Alto Schmidt in Spain, 1 in MPEC 2017-C25 -- 2017 BS93
703Catalina Sky Survey (CSS) in Arizona, 14 in MPEC 2017-C33 -- 2017 BX6, 2017 BM3, 2017 BL3, 2016 PR8, 2015 ME54, 2014 EW24, 2006 UM, 89830, 351545, 349507, 252558, 226198, 203471, 153201
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2017-C33 -- 2016 VP4
Q60ISON Siding Spring Obs. in New South Wales, 2 in MPEC 2017-C33 -- 2015 YE18, 143624
U699Steven M. Tilley in Louisiana via iTelescope Obs. Auberry in northern California, 1 in MPEC 2017-C33 -- 2017 BL30
H06iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2017-C33 -- 2017 BL30
Q62`Steven M. Tilley in Louisiana via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-C33 -- 2017 BL30
Q62|Sergio Foglia in Italy via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-C33 -- 2017 BL30
046Klet Obs. in the Czech Republic, 13 in MPEC 2017-C33 -- 2017 BW, 2017 BQ6, 2017 AF5, 2016 UU80, 2015 BN509, 2014 AD17, 2013 GL8, 2011 WO41, 2003 CR1, 2001 QE34, 85990, 137925, 5693
950.Ovidiu Vaduvescu via La Palma in the Canary Islands, 3 in MPEC 2017-C33 -- 2011 PO1, 2008 DC, 2007 EY
W85LCOGT Cerro Tololo A in Chile, 1 in MPEC 2017-C33 -- 265482
W86LCOGT Cerro Tololo B in Chile, 1 in MPEC 2017-C33 -- 2011 EP51
W87LCOGT Cerro Tololo C in Chile, 1 in MPEC 2017-C33 -- 192559
Q63LCOGT Siding Spring A in New South Wales, 1 in MPEC 2017-C33 -- 2011 EP51
Q64LCOGT Siding Spring B in New South Wales, 1 in MPEC 2017-C33 -- 192559
K92LCOGT Sutherland B in South Africa, 3 in MPECs 2017-C27 & 2017-C33 -- 2017 BU93, 2011 EP51, 192559
K93LCOGT Sutherland C in South Africa, 2 in MPEC 2017-C33 -- 2011 EP51, 192559
H01Magdalena Ridge Obs. (MRO) in New Mexico, 8 in MPECs 2017-C20, 2017-C22, 2017-C23, 2017-C25, 2017-C26, 2017-C28, 2017-C29 & 2017-C31 -- 2017 CE, 2017 BV93, 2017 BT93, 2017 BS93, 2017 BQ93, 2017 BO93, 2017 BN93, 2017 BL93
C94MASTER-II Tunka in Russia, 1 in MPEC 2017-C33 -- 2006 UM
568_Marco Micheli on Mauna Kea in Hawaii, 6 in MPECs 2017-C20, 2017-C21, 2017-C22, 2017-C24, 2017-C27 & 2017-C30 -- 2017 BU93, 2017 BR93, 2017 BP93, 2017 BN93, 2017 BM93, 2017 BL93
G96Mt. Lemmon Survey (MLS) in Arizona, 24 in MPECs 2017-C25, 2017-C26, 2017-C28, 2017-C29, 2017-C31, 2017-C32 & 2017-C33 -- 2017 CE, 2017 BW93, 2017 BV93, 2017 BT93, 2017 BS93, 2017 BQ93, 2017 BP30, 2017 BM6, 2017 BG29, 2016 YQ8, 2016 QN11, 2003 UF22, 474554, 40263, 380981, 378610, 276786, 22753, 226198, 154269, 152560, 9172, 3691, 1916
F51Pan-STARRS 1 (PS1) in Hawaii, 34 in MPECs 2017-C20, 2017-C21, 2017-C22, 2017-C23, 2017-C24, 2017-C25, 2017-C26, 2017-C27, 2017-C29, 2017-C30 & 2017-C33 -- 2017 CE, 2017 BW6, 2017 BU93, 2017 BT93, 2017 BS93, 2017 BS6, 2017 BR93, 2017 BP93, 2017 BO93, 2017 BN93, 2017 BM93, 2017 BL93, 2017 BG30, 2017 AC5, 2016 YP4, 2016 PR38, 2016 PO8, 2008 GC110, 2006 CY10, 2005 EY223, 2002 XU66, 2002 NX, 1999 LW1, 90075, 481965, 363069, 303174, 249595, 242147, 220909, 190166, 173561, 4954, 1864
6581Dave Balam via Plaskett 1.8m Telescope in British Columbia, 1 in MPEC 2017-C23 -- 2017 BO93
W98Polonia Obs. in Chile, 1 in MPEC 2017-C33 -- 1864
691Spacewatch 0.9m telescope in Arizona, 3 in MPEC 2017-C33 -- 2016 XD1, 276786, 25916
291Spacewatch 1.8m telescope in Arizona, 4 in MPECs 2017-C20, 2017-C21, 2017-C23 & 2017-C24 -- 2017 BR93, 2017 BO93, 2017 BM93, 2017 BL93
I52Steward Obs. Mt. Lemmon Station in Arizona, 9 in MPECs 2017-C23, 2017-C25, 2017-C26, 2017-C28, 2017-C29, 2017-C31, 2017-C32 & 2017-C33 -- 2017 CE, 2017 BW93, 2017 BV93, 2017 BT93, 2017 BS93, 2017 BQ93, 2017 BO93, 2017 BO31, 2017 BM6
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 10 in MPECs 2017-C33 & 2017-C34 -- 2017 BZ6, 2017 BU, 2017 BS5, 2017 BF29, 2017 BB30, 2017 AR4, 2017 AP4, 2016 YM4, 2014 YR, 2005 VL1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 3 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 BP31NEODyS1652R E M O V E D-
2017 BL30JPL Sentry18082029-2058176.5e-04-1.96-1.971JPL: "Analysis based on 60 observations spanning 5.2332 days (2017-Jan-28.37792 to 2017-Feb-02.61107)." Diameter approximately 0.071 km. from mean, weighted H=23.4.
NEODyS16522029-2088326.09e-04-1.98-2.01NEODyS: "Based on 60 optical observations (of which 0 are rejected as outliers) from 2017-01-28.379 to 2017-02-02.612."
2017 AF21NEODyS16522037-2091108.5e-09-8.07-8.350NEODyS: "Based on 7 optical observations (of which 0 are rejected as outliers) from 2017-01-04.424 to 2017-01-07.315."
2017 AP4NEODyS1652211514.03e-07-7.69-7.690NEODyS: "Based on 12 optical observations (of which 0 are rejected as outliers) from 2017-01-04.487 to 2017-01-09.349."
2016 YM4NEODyS1652R E M O V E D-

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 3 February '17

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

1922Generated Traffic Report
1910Grabbed MPEC 2017-C34 - 2014 YR - see above
1808Noted that JPL Sentry has updated its 2017 BL30 risk assessment - see above
1652Noted that NEODyS has removed 2016 YM4 as an impact risk - see above
Noted that NEODyS has posted 2017 AF21 as an impact risk - see above
Noted that NEODyS has updated its 2017 AP4 risk assessment - see above
Noted that NEODyS has updated its 2017 BL30 risk assessment - see above
Noted that NEODyS has removed 2017 BP31 as an impact risk - see above
Grabbed MPEC 2017-C33 - Daily Orbit Update - see above
0325Grabbed MPEC 2017-C21 - 2017 BM93 - see above
Grabbed MPEC 2017-C22 - 2017 BN93 - see above
Grabbed MPEC 2017-C23 - 2017 BO93 - see above
Grabbed MPEC 2017-C24 - 2017 BR93 - see above
Grabbed MPEC 2017-C25 - 2017 BS93 - see above
Grabbed MPEC 2017-C26 - 2017 BT93 - see above
Grabbed MPEC 2017-C27 - 2017 BU93 - see above
Grabbed MPEC 2017-C28 - 2017 BV93 - see above
Grabbed MPEC 2017-C29 - 2017 CE - see above
Grabbed MPEC 2017-C30 - 2017 BP93 - see above
Grabbed MPEC 2017-C31 - 2017 BQ93 - see above
Grabbed MPEC 2017-C32 - 2017 BW93 - see above
0150Grabbed MPEC 2017-C20 - 2017 BL93 - see above