Contents  on 25 February '18

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 25 February '18

Seven objects reported inside ten LD

Seven visitors are reported inside ten lunar distances (LD) of our home world today. Nearest is intruder 2018 DU, which comes into the Earth-Moon system from 1.06 LD, flies by the Moon at 1.01 LD at 0607 UTC, and passes us at 0.74 at 1821 UTC to end the day at 0.78 LD. Also within Earth's SOI, NHATS target 2018 DR gets its closest this time around, reaching 2.29 LD at 0224 UTC.

Neighborhood Traffic - sorted by Earth passage distance, grouped by 1.0, 2.41, 5.0 & 10.0 LD boundaries
Earth passage I D ~Size Distance today  Inside ten LD Notes
0.74 LD today 2018 DU 8 m  0.74 LD Feb. 15 - March 7 intruder today, NHATS target, Moon closest 1.01 LD
at 0607 UTC, Earth closest at 1821 UTC - DOU
2.29 LD today 2018 DR 11 m  2.29 LD Feb. 18 - March 3 NHATS target, Earth closest at 0224 UTC - DOU
3.7   LD yesterday* 2017 DR109 10 m  3.9 to 4.7 LD Feb. 18 - March 1 EPU +/- 30 mins.*, NHATS target
4.18 LD Feb. 27 2018 DT 13 m  4.24 from 4.37 LD Feb. 11 - March 15 NHATS target - DOU
5.18 LD yesterday 2018 CE14 26 m  5.24 to 6.02 LD Feb. 20 - 28 NHATS target
5.44 LD Feb. 27 2018 CU14 10 m  5.63 from 5.95 LD Feb. 19 - March 8 NHATS target - DOU
6.66 LD Jan. 15 2018 AV2 6 m  9.21 to 9.34 LD Nov. 10 - March 2 NHATS target, natural?

This report was generated at 2010 UTC with the discoveries of already departed objects 2018 DF1 (MPEC), which passed Earth at 7.52 LD on February 17th, and 2018 DJ1 (MPEC), which may have gone by at 9.8 LD on February 11th (+/- 1.35 hours uncertainty), and of approaching 2018 DH1 (MPEC), which is preliminarily calculated to fly by at about 9.2 LD on March 27th, but with an uncertainty of +/- 17.12 hours. Note that there is a chance that one or both of these last two will be found to miss our arbitrary ten-LD traffic reporting "bubble," while another object apparently did just barely miss. 2018 DB1 (MPEC) traipsed past at 10.20 LD at 1205 UTC today.
        The DOU MPEC today has first follow-up for passing intruder 2018 DU and inbound risk-listed 2018 DT, plus continuing follow-up for passing 2018 DR, inbound 2018 CU14, and approaching objects 2018 DC and 2017 VR12.
        About 2017 VR12, Tim Lister told NASA's small-bodies mailing list that, from analysis by Joey Chatelain, the first photometry for approaching 2017 VR12 shows a rotation period of "about 1.4 hours," to which Lance Benner at JPL replied "Wow. This is very fast for an object with H [absolute magnitude] = 20.5. Not many asteroids are known with periods this fast and with diameters that could be in the realm of 200-300 meters." (This mailing list is used by NASA to alert observers about NHATS, radar, and other targets of special interest.)

Approaching Traffic - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
3.76 LD March 7 2017 VR12 271 m  13.65 from 15.00 LD Feb. 28 - March 13 radar/NHATS target - DOU
9.27 LD March 3 2018 DC 38 m  14.02 from 15.46 LD March 1 - 5 NHATS target - DOU
6.9   LD March 10* 2015 DK200 26 m  23.2 from 24.9 LD March 6 - 14 EPU +/- 23.45 hours*, NHATS target
9.2   LD March 27* 2018 DH1 212 m  102.6 from 106.5 LD March 26 - 29 NEW, EPU +/- 17.12 hours* - MPEC
* EPU = Earth passage uncertainty



Notes: Ten times the distance to the Moon (ten LD) has no astronomical importance but is a useful boundary for reporting about transient natural objects that approach our planet's 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 temporal distances are derived by A/CC from JPL Horizons data. "LD*" indicates some uncertainty in object passage time and distance. See also current sky chart and object details (alt-details, ephemerides, and today's timeline.

NEOCP Activity  on 25 February '18

The MPC's NEO Confirmation Page has 45 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 45 objects listed. Of these, 33 were "one nighters." So far The Tracking News has counted a total of 69 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 25 February '18

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 2018-D69 - "16:46 UT" - 2018 DF1


MPEC 2018-D68 - "16:42 UT" - 2018 DN1


MPEC 2018-D67 - "16:39 UT" - 2018 DM1


MPEC 2018-D66 - "16:36 UT" - 2018 DL1


MPEC 2018-D65 - "16:33 UT" - 2018 DK1


MPEC 2018-D64 - "16:30 UT" - 2018 DJ1


MPEC 2018-D63 - "16:26 UT" - 2018 DH1


MPEC 2018-D62 - "16:22 UT" - 2018 DG1


MPEC 2018-D61 - "16:18 UT" - 2018 CB15


MPEC 2018-D60 - "15:56 UT" - 2018 DE1


MPEC 2018-D59 - "15:52 UT" - 2018 DD1


MPEC 2018-D58 - "15:48 UT" - 2018 DC1


MPEC 2018-D57 - "15:44 UT" - 2018 DB1


MPEC 2018-D56 - "15:42 UT" - 2018 DA1


<< DOU on 25 Feb. '18 >>  MPEC 2018-D55 - "13:05 UT" - Daily Orbit Update

Observers  on 25 February '18

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

CodeObserver / observatory
Z84Calar Alto Schmidt in Spain, 4 in MPECs 2018-D57, 2018-D62, 2018-D65 & 2018-D69 -- 2018 DK1, 2018 DG1, 2018 DF1, 2018 DB1
703Catalina Sky Survey (CSS) in Arizona, 9 in MPECs 2018-D55, 2018-D62 & 2018-D69 -- 2018 DG1, 2018 DF1, 2016 CW31, 53435, 508871, 248926, 14402, 141484, 2329
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 9 in MPECs 2018-D55, 2018-D58, 2018-D59, 2018-D60, 2018-D63, 2018-D64, 2018-D66 & 2018-D67 -- 2018 DM1, 2018 DL1, 2018 DJ1, 2018 DH1, 2018 DE1, 2018 DD1, 2018 DC1, 2018 BK5, 2017 XB2
K87Dettelbach Vineyard Obs. in Germany, 5 in MPECs 2018-D55 & 2018-D62 -- 2018 DT, 2018 DM, 2018 DG1, 2018 CX13, 2018 CQ3
113Drebach Obs. in Germany, 1 in MPEC 2018-D57 -- 2018 DB1
006Fabra Obs. in Spain, 1 in MPEC 2018-D55 -- 3752
595Farra d'Isonzo Obs. in Italy, 2 in MPECs 2018-D57 & 2018-D62 -- 2018 DG1, 2018 DB1
K88GINOP-KHK in Hungary, 2 in MPECs 2018-D62 & 2018-D63 -- 2018 DH1, 2018 DG1
J95Great Shefford Obs. in England, 9 in MPECs 2018-D55, 2018-D57, 2018-D62, 2018-D65, 2018-D67 & 2018-D69 -- 2018 DU, 2018 DT, 2018 DR, 2018 DM1, 2018 DK1, 2018 DG1, 2018 DF1, 2018 DB1, 2018 DA
A17Guidestar Obs. in Germany, 1 in MPEC 2018-D62 -- 2018 DG1
C43Hoyerswerda Obs. in Germany, 2 in MPECs 2018-D57 & 2018-D62 -- 2018 DG1, 2018 DB1
P93JAXA Space Tracking & Communications Center (JAXA STCC) in Japan, 2 in MPECs 2018-D55 & 2018-D62 -- 2018 DG1, 2017 VR12
Z43Landehen Obs., 5 in MPEC 2018-D55 -- 2018 CU1, 2017 VR12, 2004 CK39, 505657, 311554
H01Magdalena Ridge Obs. (MRO) in New Mexico, 7 in MPECs 2018-D57, 2018-D58, 2018-D64, 2018-D65, 2018-D66, 2018-D67 & 2018-D69 -- 2018 DM1, 2018 DL1, 2018 DK1, 2018 DJ1, 2018 DF1, 2018 DC1, 2018 DB1
G96Mt. Lemmon Survey (MLS) in Arizona, 12 in MPECs 2018-D56, 2018-D57, 2018-D58, 2018-D59, 2018-D60, 2018-D61, 2018-D64, 2018-D65, 2018-D66, 2018-D67, 2018-D68 & 2018-D69 -- 2018 DN1, 2018 DM1, 2018 DL1, 2018 DK1, 2018 DJ1, 2018 DF1, 2018 DE1, 2018 DD1, 2018 DC1, 2018 DB1, 2018 DA1, 2018 CB15
K74Muensterschwarzach Obs. in Germany, 1 in MPEC 2018-D62 -- 2018 DG1
J69North Obs. in England, 1 in MPEC 2018-D62 -- 2018 DG1
Z80Northolt Branch Obs. in England, 2 in MPECs 2018-D55 & 2018-D62 -- 2018 DT, 2018 DG1
J43Oukaimeden Obs. in Morocco, 2 in MPEC 2018-D55 -- 2015 DP155, 162011
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2018-D61 -- 2018 CB15
D29Purple Mtn. Obs. Xuyi Station in China, 1 in MPEC 2018-D63 -- 2018 DH1
033Schwarzschild Obs. in Germany, 13 in MPECs 2018-D55, 2018-D56, 2018-D58, 2018-D59, 2018-D60, 2018-D61, 2018-D62, 2018-D63, 2018-D65, 2018-D66, 2018-D67, 2018-D68 & 2018-D69 -- 2018 DN1, 2018 DM1, 2018 DL1, 2018 DK1, 2018 DH1, 2018 DG1, 2018 DF1, 2018 DE1, 2018 DD1, 2018 DC1, 2018 DA1, 2018 CB15, 2017 SO17
W884G. Gasparovic in Croatia via Slooh.com Chile Obs. in Chile, 1 in MPEC 2018-D55 -- 276033
W885M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Chile Obs. in Chile, 1 in MPEC 2018-D55 -- 2017 XB2
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2018-D63 -- 2018 DH1
291Spacewatch 1.8m telescope in Arizona, 12 in MPECs 2018-D55, 2018-D61 & 2018-D62 -- 2018 DG1, 2018 CZ13, 2018 CY, 2018 CQ3, 2018 CB15, 2018 BO1, 2017 TQ3, 2017 RP2, 2015 MT59, 2014 MQ18, 2009 FF, 2005 SC71
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2018-D62 -- 2018 DG1
I52Steward Obs. Mt. Lemmon Station in Arizona, 25 in MPECs 2018-D55, 2018-D56, 2018-D57, 2018-D58, 2018-D59, 2018-D60, 2018-D61, 2018-D62, 2018-D63, 2018-D64, 2018-D65, 2018-D66, 2018-D67, 2018-D68 & 2018-D69 -- 2018 DT, 2018 DN1, 2018 DM1, 2018 DM, 2018 DL1, 2018 DK1, 2018 DJ1, 2018 DH1, 2018 DG1, 2018 DG, 2018 DF1, 2018 DE1, 2018 DD1, 2018 DC1, 2018 DC, 2018 DB1, 2018 DA1, 2018 DA, 2018 CZ13, 2018 CU14, 2018 CR1, 2018 CP14, 2018 CH14, 2018 CB15, 2018 BH6
J22Tacande Obs. in the Canary Islands, 3 in MPECs 2018-D55, 2018-D57 & 2018-D62 -- 2018 DT, 2018 DG1, 2018 DB1
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2018-D55 -- 2018 AL13, 2015 RG36
L01Visnjan Obs., 4 in MPECs 2018-D62, 2018-D63, 2018-D65 & 2018-D69 -- 2018 DK1, 2018 DH1, 2018 DG1, 2018 DF1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 25 February '18

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS 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 NASA/JPL 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
2018 DA1NEODyS23002043-2108229.08e-07-2.46-2.760NEODyS: "Based on 31 optical observations (of which 1 are rejected as outliers) from 2018-02-18.497 to 2018-02-25.362."
JPL Sentry18332047-2116531.9055339e-06-2.11-2.300JPL: Computed at 10:24 today Pacific time based on 31 observations spanning 6.8646 days (2018-Feb-18.49641 to 2018-Feb-25.361). Diameter approximately 0.661 km. from weighted mean H=18.54.
2018 DTJPL Sentry1750R E M O V E DJPL: Risk listing removed at 1603 UTC today
2018 DQNEODyS05272027-21181333.14e-04-4.52-4.54-NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2018-02-22.452 to 2018-02-23.230."
2018 AU18NEODyS05272046-2116342.24e-06-6.91-7.150NEODyS: "Based on 15 optical observations (of which 2 are rejected as outliers) from 2018-01-15.377 to 2018-01-20.356."
2009 VZ39JPL Sentry17502018-21169137.122035e-06-6.17-7.450JPL: Computed at 11:17 April 7th of 2017 Pacific time based on 8 observations spanning .04342 days (2009-Nov-10.27204 to 2009-Nov-10.31546). Diameter approximately 0.009 km. from weighted mean H=27.88.

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 25 February '18

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

2300Noted that NEODyS has posted 2018 DA1 as an impact risk - see above
2010Generated Traffic Report
1833Noted that JPL Sentry has posted 2018 DA1 as an impact risk - see above
1750Noted that JPL Sentry has updated its 2009 VZ39 risk assessment - see above
Noted that JPL Sentry has removed 2018 DT as an impact risk - see above
Grabbed MPEC 2018-D55 - Daily Orbit Update - see above
Grabbed MPEC 2018-D56 - 2018 DA1 - see above
Grabbed MPEC 2018-D57 - 2018 DB1 - see above
Grabbed MPEC 2018-D58 - 2018 DC1 - see above
Grabbed MPEC 2018-D59 - 2018 DD1 - see above
Grabbed MPEC 2018-D60 - 2018 DE1 - see above
Grabbed MPEC 2018-D61 - 2018 CB15 - see above
Grabbed MPEC 2018-D62 - 2018 DG1 - see above
Grabbed MPEC 2018-D63 - 2018 DH1 - see above
Grabbed MPEC 2018-D64 - 2018 DJ1 - see above
Grabbed MPEC 2018-D65 - 2018 DK1 - see above
Grabbed MPEC 2018-D66 - 2018 DL1 - see above
Grabbed MPEC 2018-D67 - 2018 DM1 - see above
Grabbed MPEC 2018-D68 - 2018 DN1 - see above
Grabbed MPEC 2018-D69 - 2018 DF1 - see above
0526Noted that NEODyS has posted 2018 AU18 as an impact risk - see above
Noted that NEODyS has posted 2018 DQ as an impact risk - see above