Contents  on 18 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 18 February '17

Six objects reported inside ten LD

Six asteroidal objects are reported moving within ten lunar distances (LD) of our planet today. Nearest are two newly discovered NHATS targets: 2017 DF enters Earth's sphere of gravitational influence (SOI), sliding in from 2.67 to 2.14 LD, and 2017 DB comes in from 5.20 to 3.56 LD. Much further away, NHATS target 2017 BG30 leaves our ten-LD traffic reporting space, traveling from 9.37 to 10.08 LD.

Earth passage I D ~Size Distance Today  Notes
1.82 LD Feb. 202017 DB 13 m  3.56 from 5.20 LD NEW, NHATS target - MPEC, DOU
2.09 LD tomorrow2017 DF 16 m  2.14 from 2.67 LD NEW, enters Earth SOI, NHATS target - MPEC, DOU
2.48 LD Feb. 52017 BG30 4 m  9.37 to 10.08 LD exits ten LD, NHATS target
2.57 LD Feb. 102017 CF32 21 m  7.42 to 8.28 LD NHATS target
3.58 LD Feb. 242017 CP1 40 m  6.61 from 7.50 LD NHATS target - DOU
4.64 LD yesterday2017 BW 69 m  4.75 to 5.11 LD radar/NHATS target - DOU

This report was generated at 1914 UTC with new discoveries 2017 DF (MPEC, DOU), and 2017 DB (MPEC, DOU), and with first follow-up for departed 2017 CP32 in today's DOU MPEC, along with follow-up for NHATS targets 2017 CP1 and 2017 BW (also a radar target).

Approaching (sorted by 10-LD bubble entry date)
2.37 LD Feb. 232017 BY93 81 m  < 10 LD Feb. 21, 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
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 18 February '17

The MPC's NEO Confirmation Page has 48 listings

When last checked at 2323 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 48 objects listed. Of these, 26 were "one nighters." So far The Tracking News has counted a total of 68 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 18 February '17

Minor Planet Electronic Circulars

As of last check at 2323 UTC, there have been seven MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


<< DOU on 18 Feb. '17 >>  MPEC 2017-D19 - "13:21 UT" - Daily Orbit Update


MPEC 2017-D18 - "12:49 UT" - 2014 QX266


MPEC 2017-D17 - "04:58 UT" - 2017 DB


MPEC 2017-D16 - "04:55 UT" - 2017 DF


MPEC 2017-D15 - "04:51 UT" - 2017 DE


MPEC 2017-D14 - "04:48 UT" - 2017 DD


MPEC 2017-D13 - "04:40 UT" - 2017 DC

Observers  on 18 February '17

A total of 43 observers appear in today's MPECs.

CodeObserver / observatory
705"Kristie Nault via Apache Point Obs. in New Mexico, 3 in MPEC 2017-D19 -- 2017 CP1, 2017 BJ92, 2016 YQ8
H21Astronomical Research Obs. Westfield in Illinois, 11 in MPECs 2017-D13, 2017-D14, 2017-D17 & 2017-D19 -- 2017 DF, 2017 DE, 2017 DD, 2017 DC, 2017 DB, 2017 BH3, 2016 YZ10, 2016 PQ8, 2016 OK1, 2003 WU153, 2002 XN14
T05ATLAS Haleakala in Hawaii, 11 in MPECs 2017-D15 & 2017-D19 -- 2017 DE, 2016 UU80, 96590, 443103, 13651, 11398, 5131, 4179, 3352, 3103, 1627
T08ATLAS Mauna Loa in Hawaii, 4 in MPEC 2017-D19 -- 2017 CP1, 4179, 3103, 1627
Z84Calar Alto Schmidt in Spain, 4 in MPECs 2017-D13, 2017-D15, 2017-D16 & 2017-D17 -- 2017 DF, 2017 DE, 2017 DC, 2017 DB
160Castelmartini Obs. in Italy, 10 in MPEC 2017-D19 -- 2017 BW, 2008 ER7, 2008 CA6, 2000 CE59, 475665, 370702, 370307, 143404, 3103, 2329
703Catalina Sky Survey (CSS) in Arizona, 3 in MPECs 2017-D14 & 2017-D19 -- 2017 DD, 443103, 1943
107Cavezzo Obs. in Italy, 3 in MPEC 2017-D19 -- 2011 WO41, 54789, 40267
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2017-D15 -- 2017 DE
958Dax Obs. in France, 4 in MPECs 2017-D14, 2017-D15, 2017-D16 & 2017-D17 -- 2017 DF, 2017 DE, 2017 DD, 2017 DB
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2017-D17 -- 2017 DB
203GiaGa Obs. in Italy, 3 in MPECs 2017-D15, 2017-D16 & 2017-D17 -- 2017 DF, 2017 DE, 2017 DB
J95Great Shefford Obs. in England, 2 in MPECs 2017-D16 & 2017-D17 -- 2017 DF, 2017 DB
6951Marc W. Buie via Kitt Peak Natl. Obs. in Arizona, 1 in MPEC 2017-D19 -- 2014 QX266
246KLENOT in the Czech Republic, 3 in MPECs 2017-D13, 2017-D15 & 2017-D17 -- 2017 DE, 2017 DC, 2017 DB
W86LCOGT Cerro Tololo B in Chile, 1 in MPEC 2017-D19 -- 2011 EP51
K91LCOGT Sutherland A in South Africa, 1 in MPEC 2017-D15 -- 2017 DE
K30Luscherz Obs. in Switzerland, 2 in MPECs 2017-D14 & 2017-D16 -- 2017 DF, 2017 DD
K38M57 Obs. in Italy, 2 in MPECs 2017-D15 & 2017-D19 -- 2017 DE, 2016 UU80
H01Magdalena Ridge Obs. (MRO) in New Mexico, 3 in MPECs 2017-D13, 2017-D14 & 2017-D17 -- 2017 DD, 2017 DC, 2017 DB
W92MASTER OAFA Obs., 1 in MPEC 2017-D19 -- 90075
K95MASTER-II Sutherland in South Africa, 1 in MPEC 2017-D19 -- 413002
474Mt. John Obs. in New Zealand, 2 in MPEC 2017-D19 -- 2017 CP32, 2017 BM32
G96Mt. Lemmon Survey (MLS) in Arizona, 3 in MPECs 2017-D13, 2017-D16 & 2017-D17 -- 2017 DF, 2017 DC, 2017 DB
Z80Northolt Branch Obs. in England, 1 in MPEC 2017-D15 -- 2017 DE
C27Pallerols Obs. in Spain, 1 in MPEC 2017-D19 -- 2016 UU80
F51Pan-STARRS 1 (PS1) in Hawaii, 22 in MPECs 2017-D15 & 2017-D19 -- 2017 DE, 2017 CM32, 2017 BV6, 2017 BU93, 2017 BQ31, 2017 BO93, 2017 BN32, 2016 YU10, 2016 UU80, 2014 NB39, 2013 BM76, 2011 CX7, 2008 CE5, 2000 DO1, 1994 BB, 482391, 482111, 438955, 312956, 189973, 159923, 6456
K63Pascoli Obs. in Italy, 1 in MPEC 2017-D15 -- 2017 DE
B49Paus Obs. in Spain, 3 in MPECs 2017-D14, 2017-D15 & 2017-D16 -- 2017 DF, 2017 DE, 2017 DD
A48Povegliano Veronese Obs. in Italy, 1 in MPEC 2017-D19 -- 2017 CP1
W25RMS Obs., 2 in MPECs 2017-D15 & 2017-D16 -- 2017 DF, 2017 DE
L04ROASTERR-1 in Romania, 2 in MPECs 2017-D13 & 2017-D15 -- 2017 DE, 2017 DC
K33San Defendente Obs. in Italy, 1 in MPEC 2017-D15 -- 2017 DE
H36Sandlot Obs. in Kansas, 1 in MPEC 2017-D14 -- 2017 DD
Y00SONEAR in Brazil, 1 in MPEC 2017-D15 -- 2017 DE
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2017-D15 -- 2017 DE
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2017-D19 -- 2013 LN31
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2017-D19 -- 2014 EW24
I93St. Pardon de Conques Obs. in France, 5 in MPECs 2017-D13, 2017-D14, 2017-D15, 2017-D16 & 2017-D17 -- 2017 DF, 2017 DE, 2017 DD, 2017 DC, 2017 DB
J22Tacande Obs. in the Canary Islands, 1 in MPEC 2017-D19 -- 2017 DF
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-D18 -- 2014 QX266
C51WISE in Earth polar orbit, 1 in MPEC 2017-D19 -- 345646
J08Zonalunar Obs. in Spain, 1 in MPEC 2017-D16 -- 2017 DF
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 18 February '17

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2323 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 CM32NEODyS1646R E M O V E D-
JPL Sentry1646R E M O V E DJPL: Risk listing removed at 1605 UTC.

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 18 February '17

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

1914Generated Traffic Report
1646Noted that JPL Sentry has removed 2017 CM32 as an impact risk - see above
Noted that NEODyS has removed 2017 CM32 as an impact risk - see above
Grabbed MPEC 2017-D18 - 2014 QX266 - see above
Grabbed MPEC 2017-D19 - Daily Orbit Update - see above
0535Grabbed MPEC 2017-D13 - 2017 DC - see above
Grabbed MPEC 2017-D14 - 2017 DD - see above
Grabbed MPEC 2017-D15 - 2017 DE - see above
Grabbed MPEC 2017-D16 - 2017 DF - see above
Grabbed MPEC 2017-D17 - 2017 DB - see above