Contents  on 28 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 28 March '18

Seven objects reported inside ten LD

Seven asteroidal objects are reported within ten lunar distances (LD) of Earth today. Nearest is 2018 FB, which is inbound from 6.07 to 5.17 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
1.60 LD March 21 2018 ED9 13 m  8.33 to 9.65 LD March 14 - 29 NHATS target
4.88 LD tomorrow 2018 FB 53 m  5.17 from 6.07 LD March 25 - April 3
5.63 LD March 25 2018 FQ1 14 m  6.31 to 7.01 LD March 19 - April 1 NHATS target
6.15 LD March 26 2018 FR1 16 m  7.96 to 9.93 LD March 23 - 29
6.23 LD April 1 2018 EM4 30 m  7.68 from 8.56 LD March 26 - April 6 NHATS target - DOU
7.69 LD today 2018 FO4 11 m  7.69 LD March 24 - April 2 NHATS target, Earth closest at 2014 UTC
9.17 LD yesterday 2018 DH1 214 m  9.35 to 10.49 LD March 26 - 28 radar target, exits ten LD - DOU

This report was generated at 1942 UTC with the discovery of already departed 2018 FF5 (MPEC), which went past us at 3.58 LD on March 20th. Today's DOU MPEC has the recovery of distant 2003 FY6, observation from 2001 and 2002 of approaching radar target 68347 2001 KB67, first follow-up for departed risk-listed 2018 FQ4, and continuing follow-up for approaching objects 2018 FW4, 2018 EJ4, and 388945 2008 TZ3, inbound 2018 EM4, outbound 2018 DH1, and departed objects 2018 FN3, 2018 FW1, and 2018 FW, plus distant 2017 DC36.

Approaching Traffic - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
4.0   LD April 2* 2004 FG29 21 m  15.9 from 19.1 LD March 30 - April 5 EPU +/- 1.03 hours*
9.72 LD April 5 2018 FW4 31 m  21.05 from 23.45 LD April 4 - 5 DOU
9.24 LD April 14 2014 UR 16 m  18.47 from 19.29 LD April 10 - 18 NHATS target
6.2   LD May 8* 2016 JQ5 8 m  106.8 from 110.0 LD May 4 - 11 EPU +/- 14.00 hours*
9.65 LD May 7 1999 FN19 112 m  49.16 from 50.35 LD May 5 - 9 radar/NHATS target
6.48 LD May 9 388945 2008 TZ3 282 m  93.38 from 96.05 LD May 5 - 13 DOU
9.50 LD May 29 68347 2001 KB67 371 m  232.95 from 238.31 LD May 28 - 30 radar target - DOU
5.6   LD June 10* 2018 EJ4 182 m  96.5 from 97.9 LD June 4 - 16 EPU +/- 1.37 hours*, radar/NHATS target - DOU
8.96 LD June 11 2015 DP155 162 m  60.95 from 61.70 LD June 6 - 15 NHATS target
* EPU = Earth passage uncertainty


<< Reading:  In a trove of preprint astronomy papers posted overnight at arXiv.org, one reports "the results of the first-ever visible spectroscopic survey fully dedicated to the small (absolute magnitude H>20) near-Earth asteroid (NEA) population," and notes some pecularities, while two other papers concern 1I/`Oumuamua (2017 U1) (more links). NASA/JPL used the huge Green Bank radio telescope last November to look for cometary activity (specifically, water outgassing) from this interstellar object and found none. And, the authors of a paper examining `Oumuamua's shape and strength explain that the lightcurves reported thus far for it lead to the widely reported conclusion that it has an unusual elongation (length to width) of about 6:1. They point out that the curves could also be explained by the object being binary or having "a significant variation in the albedo of the body across its surface," but suggest these possibilities are less likely.



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 28 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 2231 UTC when the database was dated 28 March

NEOCP Activity  on 28 March '18

The MPC's NEO Confirmation Page has 18 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had eighteen objects listed. Of these, thirteen were "one nighters." So far The Tracking News has counted a total of 31 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 28 March '18

Minor Planet Electronic Circulars

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


MPEC 2018-F144 - "17:03 UT" - 2018 FJ5


MPEC 2018-F143 - "16:35 UT" - 2018 FH5


MPEC 2018-F142 - "16:29 UT" - 2018 FG5


MPEC 2018-F141 - "16:25 UT" - 2018 FF5


MPEC 2018-F140 - "16:22 UT" - 2018 FE5


MPEC 2018-F139 - "15:15 UT" - A/2018 F4


MPEC 2018-F138 - "14:54 UT" - 2018 EF9


MPEC 2018-F137 - "14:37 UT" - Comet C/2018 F3 (Johnson)


MPEC 2018-F136 - "14:09 UT" - Comet C/2018 C2 (Lemmon)


<< DOU on 28 Mar. '18 >>  MPEC 2018-F135 - "12:03 UT" - Daily Orbit Update

Observers  on 28 March '18

A total of 52 observers appear in today's MPECs.

CodeObserver / observatory
C97Al-Fulaij Obs., 1 in MPEC 2018-F135 -- 1981
E23Arcadia Obs. in New South Wales, 1 in MPEC 2018-F139 -- 2018 F4
H21Astronomical Research Obs. Westfield in Illinois, 1 in MPEC 2018-F138 -- 2018 EF9
T08ATLAS Mauna Loa in Hawaii, 1 in MPEC 2018-F135 -- 141484
215Buchloe Obs. in Germany, 1 in MPEC 2018-F136 -- C/2018 C2
Z84Calar Alto Schmidt in Spain, 1 in MPEC 2018-F136 -- C/2018 C2
W96Campo Catino Austral Obs. (CAO) in Chile, 2 in MPECs 2018-F136 & 2018-F139 -- 2018 F4, C/2018 C2
703Catalina Sky Survey (CSS) in Arizona, 15 in MPECs 2018-F135 & 2018-F136 -- 2018 FL3, 2018 FF2, 2018 DX3, C/2018 C2, 1994 RC, 66251, 53435, 497113, 474574, 363599, 337084, 172034, 9856, 1627, 1036
V06Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) in Arizona, 2 in MPECs 2018-F136 & 2018-F140 -- 2018 FE5, C/2018 C2
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 6 in MPECs 2018-F137, 2018-F139, 2018-F140, 2018-F141, 2018-F142 & 2018-F143 -- 2018 FH5, 2018 FG5, 2018 FF5, 2018 FE5, 2018 F4, C/2018 F3
A77Chante-Perdrix Obs. in France, 3 in MPECs 2018-F136, 2018-F137 & 2018-F139 -- 2018 F4, C/2018 F3, C/2018 C2
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2018-F136 -- C/2018 C2
K87Dettelbach Vineyard Obs. in Germany, 1 in MPEC 2018-F136 -- C/2018 C2
595Farra d'Isonzo Obs. in Italy, 2 in MPECs 2018-F138 & 2018-F144 -- 2018 FJ5, 2018 EF9
K88GINOP-KHK in Hungary, 2 in MPECs 2018-F136 & 2018-F138 -- 2018 EF9, C/2018 C2
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 2013 BS45
J95Great Shefford Obs. in England, 1 in MPEC 2018-F144 -- 2018 FJ5
U695Hidetaka Sato in Japan via iTelescope Obs. Auberry in northern California, 1 in MPEC 2018-F136 -- C/2018 C2
H06|Hidetaka Sato in Japan via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2018-F138 -- 2018 EF9
Q621Hidetaka Sato in Japan via iTelescope Obs. Siding Spring in New South Wales, 2 in MPECs 2018-F137 & 2018-F139 -- 2018 F4, C/2018 F3
P93JAXA Space Tracking & Communications Center in Japan, 1 in MPEC 2018-F137 -- C/2018 F3
695^Spacewatch via Kitt Peak Natl. Obs. (KPNO) in Arizona, 4 in MPECs 2018-F135 & 2018-F139 -- 2018 FQ4, 2018 FC2, 2018 F4, 2014 YJ14
246KLENOT in the Czech Republic, 2 in MPECs 2018-F139 & 2018-F144 -- 2018 FJ5, 2018 F4
D35Lulin Minor Bodies Tracking in Taiwan, 1 in MPEC 2018-F136 -- C/2018 C2
K38M57 Obs. in Italy, 1 in MPEC 2018-F136 -- C/2018 C2
H01Magdalena Ridge Obs. (MRO) in New Mexico, 4 in MPECs 2018-F137, 2018-F138, 2018-F141 & 2018-F143 -- 2018 FH5, 2018 FF5, C/2018 F3, 2018 EF9
568^R. Wainscoat on Mauna Kea in Hawaii, 1 in MPEC 2018-F139 -- 2018 F4
568_Marco Micheli on Mauna Kea in Hawaii, 2 in MPECs 2018-F136 & 2018-F139 -- 2018 F4, C/2018 C2
711McDonald Obs. in Texas, 3 in MPECs 2018-F136, 2018-F138 & 2018-F139 -- 2018 F4, 2018 EF9, C/2018 C2
900Moriyama Obs. in Japan, 1 in MPEC 2018-F136 -- C/2018 C2
474Mt. John Obs. in New Zealand, 1 in MPEC 2018-F137 -- C/2018 F3
G96Mt. Lemmon Survey (MLS) in Arizona, 17 in MPECs 2018-F135, 2018-F136, 2018-F137, 2018-F138, 2018-F139, 2018-F140, 2018-F141, 2018-F143 & 2018-F144 -- 2018 FX1, 2018 FV1, 2018 FJ5, 2018 FH5, 2018 FF5, 2018 FE5, 2018 F4, C/2018 F3, 2018 EF9, C/2018 C2, 1994 RC, 89830, 85490, 65674, 388945, 330659, 186822
644NEAT's Mt. Palomar telescope in southern California, 3 in MPEC 2018-F135 -- 88213, 85770, 68347
608NEAT's USAF Haleakala telescope in Hawaii, 5 in MPEC 2018-F135 -- 88213, 87309, 68347, 307918, 1580
I41Palomar Transient Factory in southern California, 1 in MPEC 2018-F136 -- C/2018 C2
F51Pan-STARRS 1 (PS1) in Hawaii, 3 in MPECs 2018-F136, 2018-F138 & 2018-F139 -- 2018 F4, 2018 EF9, C/2018 C2
6581Dave Balam via Plaskett 1.8m Telescope in British Columbia, 1 in MPEC 2018-F138 -- 2018 EF9
K61Rokycany Obs. in the Czech Republic, 1 in MPEC 2018-F136 -- C/2018 C2
104San Marcello Pistoiese Obs. in Italy, 2 in MPECs 2018-F137 & 2018-F144 -- 2018 FJ5, C/2018 F3
C95SATINO-1 in France, 2 in MPECs 2018-F135 & 2018-F136 -- 2018 FU4, C/2018 C2
204Schiaparelli Obs. in Italy, 1 in MPEC 2018-F144 -- 2018 FJ5
033Schwarzschild Obs. in Germany, 3 in MPECs 2018-F136, 2018-F137 & 2018-F138 -- C/2018 F3, 2018 EF9, C/2018 C2
Q11Shinshiro Obs., 1 in MPEC 2018-F136 -- C/2018 C2
G40"G. Gasparovic in Croatia via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-F136 -- C/2018 C2
G409B. Lutkenhoner in Germany via Slooh.com Canary Islands Obs. in the Canary Islands, 2 in MPECs 2018-F137 & 2018-F139 -- 2018 F4, C/2018 F3
691Spacewatch 0.9m telescope in Arizona, 3 in MPECs 2018-F135 & 2018-F139 -- 2018 FX1, 2018 F4, 2003 FY6
291Spacewatch 1.8m telescope in Arizona, 5 in MPECs 2018-F135 & 2018-F139 -- 2018 F4, 2018 EQ4, 2018 EJ4, 2017 DC36, 2010 GV147
I52Steward Obs. Mt. Lemmon Station in Arizona, 24 in MPECs 2018-F135, 2018-F136, 2018-F137, 2018-F138, 2018-F139, 2018-F140 & 2018-F144 -- 2018 FY4, 2018 FY1, 2018 FW4, 2018 FW1, 2018 FW, 2018 FV3, 2018 FV1, 2018 FN4, 2018 FN3, 2018 FM4, 2018 FL3, 2018 FJ5, 2018 FE5, 2018 FC1, 2018 FA1, 2018 F4, C/2018 F3, 2018 EP1, 2018 EM4, 2018 EF9, 2018 EE4, 2018 DH1, 2018 DF2, C/2018 C2
J22Tacande Obs. in the Canary Islands, 1 in MPEC 2018-F136 -- C/2018 C2
954Teide Obs. in the Canary Islands, 1 in MPEC 2018-F136 -- C/2018 C2
T14UH/Tholen NEO Follow-Up CFH Telescope in Hawaii, 1 in MPEC 2018-F142 -- 2018 FG5
L01Visnjan Obs., 1 in MPEC 2018-F144 -- 2018 FJ5
C51WISE in Earth polar orbit, 8 in MPEC 2018-F135 -- 2015 HF11, 85804, 54401, 414532, 333888, 234061, 163691, 138883
C42Xingming Obs. in China, 1 in MPEC 2018-F136 -- C/2018 C2
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 28 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 FJ5JPL Sentry19032039-2111392.083244e-07-3.64-4.540JPL: Computed at 11:42 today Pacific time based on 33 observations spanning 3.8318 days (2018-Mar-24.43016 to 2018-Mar-28.26192). Diameter approximately 0.388 km. from weighted mean H=19.71.
2018 FE4NEODyS16482079-2118191.1e-06-5.86-6.53n/aNEODyS: "Based on 24 optical observations (of which 1 are rejected as outliers) from 2018-03-20.460 to 2018-03-27.382."
2018 FA4NEODyS1648209126.16e-08-7.53-7.630NEODyS: "Based on 33 optical observations (of which 0 are rejected as outliers) from 2018-03-18.365 to 2018-03-26.265."
2018 FC2JPL Sentry16482099-209911.072e-07-7.06-7.060JPL: Computed at 07:28 today Pacific time based on 30 observations spanning 9.7976 days (2018-Mar-18.58001 to 2018-Mar-28.37765). Diameter approximately 0.038 km. from weighted mean H=24.77.
NEODyS1648209911.27e-06-5.99-5.990NEODyS: "Based on 28 optical observations (of which 0 are rejected as outliers) from 2018-03-18.581 to 2018-03-26.384."
2018 FU1NEODyS16482059-2117321.17e-05-6.20-6.410NEODyS: "Based on 25 optical observations (of which 0 are rejected as outliers) from 2018-03-18.474 to 2018-03-27.440."
2018 EE9NEODyS16482040-2118411.39e-05-5.56-6.28n/aNEODyS: "Based on 13 optical observations (of which 0 are rejected as outliers) from 2018-03-12.667 to 2018-03-26.315."
2018 EL4NEODyS1648211011.44e-07-7.35-7.350NEODyS: "Based on 63 optical observations (of which 0 are rejected as outliers) from 2018-03-14.211 to 2018-03-23.203."

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 28 March '18

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

2231Noted Radar Astrometry database update - see above
1942Generated Traffic Report
1903Noted that JPL Sentry has posted 2018 FJ5 as an impact risk - see above
1740Grabbed MPEC 2018-F144 - 2018 FJ5 - see above
1648Noted that NEODyS has updated its 2018 EE9 risk assessment - see above
Noted that NEODyS has updated its 2018 EL4 risk assessment - see above
Noted that NEODyS has updated its 2018 FA4 risk assessment - see above
Noted that JPL Sentry has updated its 2018 FC2 risk assessment - see above
Noted that NEODyS has updated its 2018 FC2 risk assessment - see above
Noted that NEODyS has updated its 2018 FE4 risk assessment - see above
Noted that NEODyS has updated its 2018 FU1 risk assessment - see above
Grabbed MPEC 2018-F135 - Daily Orbit Update - see above
Grabbed MPEC 2018-F136 - Comet C/2018 C2 (Lemmon) - see above
Grabbed MPEC 2018-F137 - Comet C/2018 F3 (Johnson) - see above
Grabbed MPEC 2018-F138 - 2018 EF9 - see above
Grabbed MPEC 2018-F139 - A/2018 F4 - see above
Grabbed MPEC 2018-F140 - 2018 FE5 - see above
Grabbed MPEC 2018-F141 - 2018 FF5 - see above
Grabbed MPEC 2018-F142 - 2018 FG5 - see above
Grabbed MPEC 2018-F143 - 2018 FH5 - see above