Contents  on 20 March '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 20 March '18

Five objects reported inside ten LD

There are five minor planets known to be within ten lunar distances (LD) of Earth today. Nearest are newly announced risk-listed 2018 FG1, inbound from 5.15 to 4.47 LD, and two outbound: 2018 ET1 moves out from 4.96 to 5.72 LD and 2018 FE from 5.52 to 7.68 LD.

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
3.39 LD March 15 2018 FH1 16 m  6.22 to 7.18 LD March 6 - 23 DOU
3.93 LD March 18 2018 FE 8 m  5.52 to 7.68 LD March 15 - 21
4.38 LD March 18 2018 ET1 18 m  4.96 to 5.72 LD March 11 - 24 NHATS target
4.45 LD tomorrow 2018 FG1 12 m  4.47 from 5.15 LD March 17 - 25 risk - DOU
7.68 LD March 22 2018 EV1 27 m  8.45 from 9.76 LD yesterday - March 24 DOU

This report was generated at 2142 UTC with the the discoveries of outbound 2018 FH1 (MPEC, DOU) and inbound risk-listed 2018 FG1 (MPEC, DOU), and with the recovery of approaching 388945 2008 TZ3 in today's DOU MPEC. The DOU also has first follow-up for approaching 2018 FB and departed objects 2018 FW, 2018 FT, and 2018 EF4, as well as continuing follow-up for approaching objects 2018 EM4, 2018 EJ4, 2018 DH1, and 2015 DP155, inbound 2018 EV1, and departed objects 2018 EX1 and 2018 EW1.

Approaching Traffic - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
4.9   LD March 29* 2018 FB 61 m  17.7 from 19.5 LD March 25 - April 3 EPU +/- 6 mins.* - DOU
9.17 LD March 27 2018 DH1 214 m  22.86 from 25.91 LD March 26 - 28 DOU
6.22 LD April 1 2018 EM4 29 m  16.71 from 18.01 LD March 26 - April 6 NHATS target - DOU
4.0   LD April 2* 2004 FG29 21 m  42.7 from 46.1 LD March 30 - April 5 EPU +/- 1.03 hours*
9.24 LD April 14 2014 UR 16 m  25.11 from 25.94 LD April 10 - 18 NHATS target
6.2   LD May 8* 2016 JQ5 8 m  133.7 from 137.2 LD May 4 - 11 EPU +/- 14.00 hours*
9.65 LD May 7 1999 FN19 112 m  59.05 from 60.36 LD May 5 - 9 radar/NHATS target
6.48 LD May 9 388945 2008 TZ3 282 m  115.66 from 118.60 LD May 5 - 13 DOU
9.50 LD May 29 68347 2001 KB67 371 m  276.79 from 282.38 LD May 28 - 30 radar target
5.5   LD June 10* 2018 EJ4 182 m  108.0 from 109.5 LD June 4 - 16 EPU +/- 6.43 hours*, NHATS target - DOU
8.96 LD June 11 2015 DP155 162 m  67.39 from 68.28 LD June 6 - 15 NHATS target - DOU
* EPU = Earth passage uncertainty


<< Reading:  The Spanish science news service SINC has an item telling that "Nowadays [Scholz's star, a red/brown binary] is almost 20 light-years away, but 70,000 years ago it entered the Oort cloud, a reservoir of trans-Neptunian objects located at the confines of the solar system," and reporting that calculations show that the trajectories of some comets with hyperbolic orbits are influenced by that passage. See additionally the related February preprint, which discusses 1I/`Oumuamua (A/2017 U1) (links) and "eight candidate interstellar comets."



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. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

Radar Astrometry  on 20 March '18

Radar observation of one object

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:


Data update noted at 0019 UTC when the database was dated 19 March

NEOCP Activity  on 20 March '18

The MPC's NEO Confirmation Page has 84 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 84 objects listed. Of these, 42 were "one nighters." The Tracking News counted a total of 105 listings on the NEOCP on this day.

New MPECs  on 20 March '18

Minor Planet Electronic Circulars

There were nine MPECs posted this day from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2018-F54 - "23:58 UT" - 2018 FV1


MPEC 2018-F53 - "23:54 UT" - 2018 FU1


MPEC 2018-F52 - "23:51 UT" - 2018 FT1


MPEC 2018-F51 - "23:48 UT" - 2018 FS1


MPEC 2018-F50 - "23:44 UT" - 2018 FR1


MPEC 2018-F49 - "23:40 UT" - 2018 FQ1


MPEC 2018-F48 - "23:36 UT" - 2018 EC9


<< DOU on 20 Mar. '18 >>  MPEC 2018-F47 - "12:04 UT" - Daily Orbit Update


MPEC 2018-F46 - "01:32 UT" - 2016 EE158

Observers  on 20 March '18

A total of 31 observers appeared in this day's MPECs.

CodeObserver / observatory
C97Al-Fulaij Obs., 5 in MPEC 2018-F47 -- 2018 DH1, 3752, 3122, 1981, 1036
H21Astronomical Research Obs. Westfield in Illinois, 6 in MPEC 2018-F47 -- 2018 EX1, 2018 CQ1, 2017 XJ62, 2017 UR7, 2017 SO17, 267720
T05ATLAS Haleakala in Hawaii, 3 in MPEC 2018-F47 -- 3752, 1981, 1866
T08ATLAS Mauna Loa in Hawaii, 12 in MPEC 2018-F47 -- 2018 DX3, 2009 SK104, 85953, 66251, 53435, 322763, 248926, 204232, 172034, 12923, 9856, 1627
I47Auger Obs. in Argentina, 1 in MPEC 2018-F47 -- 2015 PC228
703Catalina Sky Survey (CSS) in Arizona, 24 in MPEC 2018-F47 -- 2018 FH1, 2018 FD, 2018 FA1, 2018 EZ, 2018 DH1, 2018 DB2, 2017 UA1, 2016 CL32, 2015 XE352, 2015 DP155, 2013 QH10, 2010 FL, 2006 UF17, 2001 FA58, 511808, 450894, 434344, 388945, 38091, 36284, 358744, 265196, 7977, 6053
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 8 in MPECs 2018-F46, 2018-F47, 2018-F48 & 2018-F52 -- 2018 FT1, 2018 EC9, 2018 EB, 2017 WO28, 2017 WE2, 2017 VX1, 2017 QY16, 2016 EE158
006Fabra Obs. in Spain, 2 in MPEC 2018-F47 -- 3752, 1981
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 2017 WX12
511Haute Provence Obs. in Germany, 2 in MPECs 2018-F47 & 2018-F49 -- 2018 FQ1, 2018 FG1
W85LCO Cerro Tololo A in Chile, 1 in MPEC 2018-F47 -- 267940
W87LCO Cerro Tololo C in Chile, 1 in MPEC 2018-F47 -- 267940
Q63LCO Siding Spring A in New South Wales, 1 in MPEC 2018-F47 -- 388189
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2018-F48 -- 2018 EC9
568^R. Wainscoat on Mauna Kea in Hawaii, 6 in MPECs 2018-F47, 2018-F49, 2018-F50, 2018-F53 & 2018-F54 -- 2018 FV1, 2018 FU1, 2018 FR1, 2018 FQ1, 2018 FD1, 2011 FG
932McCarthy Obs. in Connecticut, 1 in MPEC 2018-F47 -- 1981
108Montelupo Obs. in Italy, 2 in MPEC 2018-F47 -- 172034, 9856
G96Mt. Lemmon Survey (MLS) in Arizona, 27 in MPECs 2018-F47, 2018-F50, 2018-F52 & 2018-F54 -- 2018 FV1, 2018 FT1, 2018 FR1, 2018 FH1, 2018 FH, 2018 FC1, 2018 EE4, 2018 DX1, 2015 RG36, 2013 GZ7, 2012 FN62, 99248, 495323, 457059, 444185, 368664, 337557, 333888, 322763, 172722, 153267, 138013, 12923, 10145, 9856, 7753, 3551
J69North Obs. in England, 3 in MPEC 2018-F47 -- 2018 FB, 2018 DH1, 2015 XE352
Z80Northolt Branch Obs. in England, 3 in MPEC 2018-F47 -- 2018 DX3, 2018 DH1, 1981
J43Oukaimeden Obs. in Morocco, 1 in MPEC 2018-F47 -- 38091
F51Pan-STARRS 1 (PS1) in Hawaii, 16 in MPECs 2018-F47, 2018-F49, 2018-F50, 2018-F51, 2018-F52, 2018-F53 & 2018-F54 -- 2018 FV1, 2018 FU1, 2018 FT1, 2018 FS1, 2018 FR1, 2018 FQ1, 2018 FA1, 2018 EU3, 2018 ES2, 2016 BD1, 2012 VL94, 2010 LM14, 454100, 163692, 9856, 3271
619Sabadell Obs. in Spain, 1 in MPEC 2018-F47 -- 2018 DH1
033Schwarzschild Obs. in Germany, 5 in MPECs 2018-F49, 2018-F50, 2018-F51, 2018-F52 & 2018-F53 -- 2018 FU1, 2018 FT1, 2018 FS1, 2018 FR1, 2018 FQ1
G40!M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-F47 -- 2018 EZ
G403Tony Evans in Portugal via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-F47 -- 2018 FB
691Spacewatch 0.9m telescope in Arizona, 17 in MPECs 2018-F47 & 2018-F51 -- 2018 FS1, 2018 FF1, 2018 EZ3, 2018 EZ, 2018 EY3, 2018 EX3, 2018 EW3, 2018 EW1, 2018 EU3, 2018 ES2, 2018 ER1, 2018 EQ4, 2018 EM2, 2018 EL4, 2018 EE4, 2018 EA1, 2018 CZ13
291Spacewatch 1.8m telescope in Arizona, 7 in MPEC 2018-F47 -- 2018 EY, 2018 EX, 2018 EK2, 2018 DX1, 2018 DC1, 2018 DA2, 2018 BA7
I52Steward Obs. Mt. Lemmon Station in Arizona, 54 in MPECs 2018-F47, 2018-F50, 2018-F51 & 2018-F54 -- 2018 FY, 2018 FW, 2018 FV1, 2018 FV, 2018 FU, 2018 FT, 2018 FS1, 2018 FR1, 2018 FD, 2018 FB, 2018 EZ3, 2018 EX, 2018 EW3, 2018 EW1, 2018 EV1, 2018 EU3, 2018 ER4, 2018 ER1, 2018 EQ4, 2018 EP1, 2018 EO4, 2018 EM4, 2018 EM2, 2018 EL4, 2018 EK4, 2018 EJ4, 2018 EH4, 2018 EF4, 2018 EE4, 2018 EE, 2018 EA4, 2018 EA1, 2018 DY1, 2018 DJ, 2018 DH1, 2018 DF2, 2018 DB2, 2018 DA4, 2018 CZ13, 2018 CX13, 2018 CG2, 2018 CE2, 2018 BP5, 2018 BO3, 2018 BH6, 2018 BA7, 2017 YE5, 2017 WE2, 2017 VO15, 2017 TV4, 2017 TH6, 2017 SR32, 2017 SL33, 2015 BE513
T14UH/Tholen NEO Follow-Up CFH Telescope in Hawaii, 1 in MPEC 2018-F48 -- 2018 EC9
C51WISE in Earth polar orbit, 2 in MPECs 2018-F47 & 2018-F48 -- 2018 EC9, 153195
I15Wishing Star Obs. in Rhode Island, 7 in MPEC 2018-F47 -- 2018 FB, 2018 EE, 2015 RL82, 2001 FA58, 497117, 162882, 1981
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 20 March '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 FG1JPL Sentry16342103-211776.5205e-07-7.62-8.140JPL #2 for the day: Computed at 09:11 today Pacific time based on 20 observations spanning 1.6747 days (2018-Mar-18.26414 to 2018-Mar-19.9388). Diameter approximately 0.012 km. from weighted mean H=27.33.
NEODyS16002075-2117171.01e-06-7.26-7.880NEODyS: "Based on 14 optical observations (of which 2 are rejected as outliers) from 2018-03-18.265 to 2018-03-19.882."
2018 EL4JPL Sentry1634R E M O V E DJPL: Risk listing removed at 1622 UTC today
NEODyS1600211212.06e-10-10.15-10.150NEODyS: "Based on 39 optical observations (of which 0 are rejected as outliers) from 2018-03-14.211 to 2018-03-18.142."
2018 EB4NEODyS16002099-211123.54e-06-5.81-5.820NEODyS: "Based on 82 optical observations (of which 0 are rejected as outliers) from 2018-03-12.350 to 2018-03-16.061."
2013 RZ53JPL Sentry03452104-210723.6663e-06-8.89-9.000JPL: Computed at 18:20 March 19th Pacific time based on 27 observations spanning 2.7164 days (2013-Sep-13.37086 to 2013-Sep-16.087304). Diameter approximately 0.002 km. from weighted mean H=31.15.

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 20 March '18

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

0026 3/21Grabbed MPEC 2018-F54 - 2018 FV1 - see above
2358Grabbed MPEC 2018-F48 - 2018 EC9 - see above
Grabbed MPEC 2018-F49 - 2018 FQ1 - see above
Grabbed MPEC 2018-F50 - 2018 FR1 - see above
Grabbed MPEC 2018-F51 - 2018 FS1 - see above
Grabbed MPEC 2018-F52 - 2018 FT1 - see above
Grabbed MPEC 2018-F53 - 2018 FU1 - see above
2142Generated Traffic Report
1634Noted that JPL Sentry has removed 2018 EL4 as an impact risk - see above
Noted that JPL Sentry has updated its 2018 FG1 risk assessment - see above
1600Noted that NEODyS has updated its 2018 EB4 risk assessment - see above
Noted that NEODyS has updated its 2018 EL4 risk assessment - see above
Noted that NEODyS has posted 2018 FG1 as an impact risk - see above
Grabbed MPEC 2018-F47 - Daily Orbit Update - see above
0345Noted that JPL Sentry has updated its 2013 RZ53 risk assessment - see above
Noted that JPL Sentry has posted 2018 FG1 as an impact risk - see above
Grabbed MPEC 2018-F46 - 2016 EE158 - see above
0019Noted Radar Astrometry database update - see above