Contents  on 19 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 19 February '17

Five objects reported inside ten LD

Today five Solar-System small bodies are known to be less than ten lunar distances (LD) from Earth. The nearest is inside our planet's SOI (sphere of gravitational influence), NHATS target 2017 DF comes its closest to us on this passage, reaching 2.09 LD at 0926 UTC, and its closest to the Moon -- 2.16 LD at 2304 UTC. And NHATS target 2017 DB enters Earth's SOI, coming in from 3.56 to 2.21 LD.

Earth passage I D ~Size Distance Today  Notes
1.82 LD tomorrow2017 DB 13 m  2.21 from 3.56 LD enters Earth SOI, NHATS target - DOU
2.09 LD today2017 DF 16 m  2.09 LD NHATS target, Earth closest at 0926 UTC, Moon closest 2.16 LD at 2304 UTC - DOU
2.57 LD Feb. 102017 CF32 21 m  8.28 to 9.15 LD NHATS target - DOU
3.58 LD Feb. 242017 CP1 40 m  5.78 from 6.62 LD NHATS target - DOU
4.63 LD Feb. 172017 BW 69 m  5.10 to 5.66 LD radar/NHATS target - DOU

This report was generated at 2120 UTC with first follow-up for 2017 DF, 2017 DB, and outbound NHATS target 2017 CF32 in today's DOU MPEC, along with follow-up for inbound NHATS target 2017 CP1, outbound radar/NHATS target 2017 BW, approaching risk-listed 2017 BY93, and departed NHATS target 2017 BY.

Approaching (in order of 10-LD bubble entry)
2.37 LD Feb. 232017 BY93 82 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.



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 19 February '17

The MPC's NEO Confirmation Page has 41 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 41 objects listed. Of these, 25 were "one nighters." So far The Tracking News has counted a total of 60 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 19 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.


MPEC 2017-D22 - "16:21 UT" - Comet C/2017 C2 (Panstarrs)


MPEC 2017-D21 - "14:31 UT" - 2015 BN311


<< DOU on 19 Feb. '17 >>  MPEC 2017-D20 - "13:04 UT" - Daily Orbit Update

Observers  on 19 February '17

A total of 39 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 7 in MPEC 2017-D20 -- 2017 CP1, 2017 BY, 2017 BL30, 2016 UU80, 2014 RC11, 2013 EP41, 296318
T05ATLAS Haleakala in Hawaii, 10 in MPECs 2017-D20 & 2017-D22 -- 2017 DE, C/2017 C2, 2013 YK148, 2013 GL8, 2011 WO41, 2006 EC1, 40267, 310842, 226198, 10165
T08ATLAS Mauna Loa in Hawaii, 1 in MPEC 2017-D20 -- 310842
C77Bernezzo Obs. in Italy, 1 in MPEC 2017-D22 -- C/2017 C2
300Bisei Spaceguard Center in Japan, 1 in MPEC 2017-D22 -- C/2017 C2
215Buchloe Obs. in Germany, 1 in MPEC 2017-D22 -- C/2017 C2
Z84Calar Alto Schmidt in Spain, 1 in MPEC 2017-D22 -- C/2017 C2
160Castelmartini Obs. in Italy, 3 in MPEC 2017-D20 -- 468583, 5131, 1627
107Cavezzo Obs. in Italy, 6 in MPEC 2017-D20 -- 2017 CP1, 2017 BY93, 2017 BM123, 2001 QE34, 2000 CE59, 5653
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 12 in MPEC 2017-D20 -- 2017 CW1, 2017 CO1, 2017 CO, 2017 BZ6, 2017 BZ5, 2017 BG32, 2017 BE92, 2017 AY13, 2017 AW3, 2016 YX7, 2016 VY5, 2016 RU
106Crni Vrh Obs. in Slovenia, 1 in MPEC 2017-D22 -- C/2017 C2
I17Cupillari Obs. in Pennsylvania, 1 in MPEC 2017-D20 -- 136635
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2017-D22 -- C/2017 C2
K88GINOP-KHK in Hungary, 1 in MPEC 2017-D22 -- C/2017 C2
J95Great Shefford Obs. in England, 2 in MPEC 2017-D20 -- 2017 DF, 2017 DB
B15Inastars Obs. in Germany, 1 in MPEC 2017-D22 -- C/2017 C2
H06|Hidetaka Sato in Japan via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2017-D22 -- C/2017 C2
Q62`Steven M. Tilley in Louisiana via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-D20 -- 2017 BL30
K85Kelmis Obs., 1 in MPEC 2017-D20 -- 164121
246KLENOT in the Czech Republic, 1 in MPEC 2017-D22 -- C/2017 C2
Z21LCOGT Tenerife Aqawan A#1 in the Canary Islands, 1 in MPEC 2017-D22 -- C/2017 C2
130Lumezzane Obs. in Italy, 3 in MPEC 2017-D20 -- 2017 CP1, 2017 BL30, 2014 EW24
K30Luscherz Obs. in Switzerland, 1 in MPEC 2017-D20 -- 370702
K38M57 Obs. in Italy, 1 in MPEC 2017-D22 -- C/2017 C2
C10Maisoncelles Obs. in France, 1 in MPEC 2017-D22 -- C/2017 C2
C94MASTER-II Tunka in Russia, 3 in MPEC 2017-D20 -- 2011 WO41, 11398, 3103
J69North Obs. in England, 3 in MPEC 2017-D20 -- 2017 DE, 2017 CP1, 2017 BW
Z80Northolt Branch Obs. in England, 3 in MPECs 2017-D20 & 2017-D22 -- C/2017 C2, 2017 BY93, 2017 BM123
J43Oukaimeden Obs. in Morocco, 4 in MPEC 2017-D20 -- 386298, 370702, 364136, 198752
F51Pan-STARRS 1 (PS1) in Hawaii, 12 in MPECs 2017-D20 & 2017-D22 -- 2017 DE, C/2017 C2, 2017 BX32, 2017 BJ92, 2015 BO509, 2005 YV55, 481965, 481543, 457059, 23606, 13553, 10165
A53Peschiera del Garda Obs. in Italy, 3 in MPEC 2017-D20 -- 2017 CP1, 2016 UU80, 2001 QE34
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 10 in MPEC 2017-D20 -- 2017 CP1, 2017 BL30, 2016 XD1, 2005 EY223, 2002 LS32, 2001 QE34, 54789, 443103, 349507, 433
A48Povegliano Veronese Obs. in Italy, 1 in MPEC 2017-D20 -- 2017 CP1
D29Purple Mtn. Obs. Xuyi Station in China, 11 in MPEC 2017-D20 -- 2011 WO41, 2005 YV55, 2003 EZ16, 99935, 481904, 420286, 40267, 386298, 34613, 11398, 3103
W25RMS Obs., 5 in MPEC 2017-D20 -- 2017 DD, 2017 BY93, 2017 BM123, 2013 YK148, 370702
204Schiaparelli Obs. in Italy, 6 in MPEC 2017-D20 -- 2017 BM3, 2017 BL3, 2017 BK3, 2008 CE5, 2006 DX, 1997 AC11
G40!M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-D20 -- 2017 BL30
G40%program code "%" (14) via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-D20 -- 2017 CF32
G409B. Lutkenhoner in Germany via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-D22 -- C/2017 C2
A71Stixendorf Obs. in Austria, 1 in MPEC 2017-D22 -- C/2017 C2
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-D21 -- 2015 BN311
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 19 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 BY93JPL Sentry1649R E M O V E DJPL: Risk listing removed at 1615 UTC.
2017 BL30NEODyS20252029-2104117.75e-05-2.86-2.860NEODyS: "Based on 186 optical observations (of which 0 are rejected as outliers) from 2017-01-28.379 to 2017-02-19.102."
JPL Sentry16492029-205241.0e-05-3.74-3.750JPL: "Analysis based on 186 observations spanning 21.723 days (2017-Jan-28.37792 to 2017-Feb-19.10082)." Diameter approximately 0.073 km. from mean, weighted H=23.4.

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 19 February '17

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

2120Generated Traffic Report
2025Noted that NEODyS has updated its 2017 BL30 risk assessment - see above
1649Noted that JPL Sentry has updated its 2017 BL30 risk assessment - see above
Noted that JPL Sentry has removed 2017 BY93 as an impact risk - see above
Grabbed MPEC 2017-D20 - Daily Orbit Update - see above
Grabbed MPEC 2017-D21 - 2015 BN311 - see above
Grabbed MPEC 2017-D22 - Comet C/2017 C2 (Panstarrs) - see above