Contents  on 4 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 4 March '18

Nine objects reported inside ten LD

Nine planetesimals are reported inside ten lunar distances (LD) of Earth today. Nearest is intruder 2018 DV1, heading away from 2.44 to 3.79 LD, while newly announced 2018 DC4 comes its closest to Earth this time around, reaching 3.32 LD at 1912 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
0.29 LD March 2 2018 DV1 7 m  2.44 to 3.79 LD Feb. 22 - March 9 intruder, NHATS target
0.74 LD Feb. 25 2018 DU 8 m  6.16 to 7.13 LD Feb. 15 - March 7 intruder, NHATS target
3.32 LD today 2018 DC4 11 m  3.32 LD Feb. 22 - March 15 NEW, Earth closest at 1912 UTC - MPEC
3.76 LD March 7 2017 VR12 275 m  4.99 from 6.02 LD Feb. 28 - March 13 radar/NHATS target - DOU
3.87 LD March 1 2018 DW1 15 m  9.04 to 11.57 LD Feb. 25 - today exits ten LD
4.18 LD Feb. 27 2018 DT 13 m  5.04 to 5.39 LD Feb. 11 - March 15 NHATS target
5.09 LD March 2 2018 DU1 9 m  5.52 to 6.20 LD Feb. 24 - March 8 NHATS target, risk
5.44 LD Feb. 27 2018 CU14 10 m  7.03 to 7.68 LD Feb. 19 - March 8 NHATS target
9.27 LD yesterday 2018 DC 39 m  9.28 to 9.57 LD March 1 - 5 NHATS target

This report was generated at 1948 UTC with new discoveries 2018 DC4 (MPEC) and 2018 DY3 (MPEC), both in the traffic tables (above and below), and with follow-up in today's DOU MPEC for departed 2017 YH1 (27.67 days added to its previous 46.20-day observing arc) and inbound 2017 VR12.

Approaching Traffic - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
6.9   LD March 10* 2015 DK200 26 m  11.7 from 13.1 LD March 6 - 14 EPU +/- 23.45 hours*, NHATS target
5.28 LD March 11 2018 DY3 20 m  12.23 from 13.90 LD March 6 - 15 NEW - MPEC
9.1   LD March 27* 2018 DH1 208 m  76.1 from 79.8 LD March 26 - 28 EPU +/- 8.45 hours*
* 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. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

NEOCP Activity  on 4 March '18

The MPC's NEO Confirmation Page has 9 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had nine objects listed. Of these, two were "one nighters." So far The Tracking News has counted a total of 32 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 4 March '18

Minor Planet Electronic Circulars

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


MPEC 2018-E18 - "22:45 UT" - A/2018 C2


MPEC 2018-E17 - "22:15 UT" - A/2017 U7


MPEC 2018-E16 - "19:04 UT" - 2018 DF4


MPEC 2018-E15 - "17:58 UT" - 2018 DE4


MPEC 2018-E14 - "17:45 UT" - 2018 DD4


MPEC 2018-E13 - "17:42 UT" - 2018 DC4


MPEC 2018-E12 - "17:39 UT" - 2018 DB4


MPEC 2018-E11 - "17:36 UT" - 2018 DA4


MPEC 2018-E10 - "17:33 UT" - 2018 DZ3


MPEC 2018-E09 - "17:27 UT" - 2018 DY3


MPEC 2018-E08 - "17:24 UT" - 2018 DX3


MPEC 2018-E07 - "17:21 UT" - 2018 DW3


<< DOU on 4 Mar. '18 >>  MPEC 2018-E06 - "13:01 UT" - Daily Orbit Update


MPEC 2018-E05 - "12:29 UT" - 2014 KV86

Observers  on 4 March '18

A total of 50 observers appear in today's MPECs.

CodeObserver / observatory
C97Al-Fulaij Obs., 5 in MPEC 2018-E06 -- 36284, 311554, 162882, 3752, 3122
H21Astronomical Research Obs. Westfield in Illinois, 4 in MPECs 2018-E07, 2018-E10, 2018-E11 & 2018-E15 -- 2018 DZ3, 2018 DW3, 2018 DE4, 2018 DA4
Z84Calar Alto Schmidt in Spain, 1 in MPEC 2018-E18 -- 2018 C2
703Catalina Sky Survey in Arizona, 1 in MPEC 2018-E18 -- 2018 C2
V06Catalina Sky Survey Kuiper Telescope in Arizona, 1 in MPEC 2018-E18 -- 2018 C2
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 9 in MPECs 2018-E07, 2018-E08, 2018-E10, 2018-E11, 2018-E12, 2018-E13, 2018-E14, 2018-E16 & 2018-E17 -- 2018 DZ3, 2018 DX3, 2018 DW3, 2018 DF4, 2018 DD4, 2018 DC4, 2018 DB4, 2018 DA4, 2017 U7
A77Chante-Perdrix Obs. in France, 1 in MPEC 2018-E18 -- 2018 C2
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2018-E18 -- 2018 C2
V16Dark Sky New Mexico Obs. in New Mexico, 1 in MPEC 2018-E06 -- 505657
K87Dettelbach Vineyard Obs. in Germany, 1 in MPEC 2018-E18 -- 2018 C2
J04ESA Optical Ground Station in the Canary Islands, 1 in MPEC 2018-E17 -- 2017 U7
734Farpoint Obs. in Kansas, 1 in MPEC 2018-E15 -- 2018 DE4
E104program code 4 via Faulkes Telescope South in New South Wales, 1 in MPEC 2018-E17 -- 2017 U7
K88GINOP-KHK in Hungary, 2 in MPECs 2018-E08 & 2018-E18 -- 2018 DX3, 2018 C2
J95Great Shefford Obs. in England, 1 in MPEC 2018-E14 -- 2018 DD4
G48Harlingten Research Obs. in New Mexico, 1 in MPEC 2018-E06 -- 508912
U695Hidetaka Sato in Japan via iTelescope Obs. Auberry in northern California, 1 in MPEC 2018-E18 -- 2018 C2
H06|Hidetaka Sato in Japan via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2018-E15 -- 2018 DE4
Q621Hidetaka Sato in Japan via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-E17 -- 2017 U7
W08Jimginny Obs., 1 in MPEC 2018-E06 -- 3122
695^Spacewatch via Kitt Peak Natl. Obs. (KPNO) in Arizona, 5 in MPECs 2018-E06 & 2018-E09 -- 2018 DY3, 2017 YH1, 2017 WN28, 2017 VW13, 2017 OP19
W85LCO Cerro Tololo A in Chile, 1 in MPEC 2018-E17 -- 2017 U7
W87LCO Cerro Tololo C in Chile, 1 in MPEC 2018-E17 -- 2017 U7
K38M57 Obs. in Italy, 2 in MPECs 2018-E11 & 2018-E18 -- 2018 DA4, 2018 C2
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2018-E16 -- 2018 DF4
568_Marco Micheli on Mauna Kea in Hawaii, 1 in MPEC 2018-E17 -- 2017 U7
711McDonald Obs. in Texas, 1 in MPEC 2018-E18 -- 2018 C2
G96Mt. Lemmon Survey (MLS) in Arizona, 11 in MPECs 2018-E07, 2018-E08, 2018-E09, 2018-E10, 2018-E11, 2018-E12, 2018-E13, 2018-E14, 2018-E15, 2018-E16 & 2018-E18 -- 2018 DZ3, 2018 DY3, 2018 DX3, 2018 DW3, 2018 DF4, 2018 DE4, 2018 DD4, 2018 DC4, 2018 DB4, 2018 DA4, 2018 C2
G34Oberfrauendorf Obs. in Germany, 2 in MPEC 2018-E06 -- 2017 VR12, 311554
I41Palomar Transient Factory in southern California, 1 in MPEC 2018-E18 -- 2018 C2
F51Pan-STARRS 1 (PS1) in Hawaii, 4 in MPECs 2018-E15, 2018-E16, 2018-E17 & 2018-E18 -- 2018 DF4, 2018 DE4, 2018 C2, 2017 U7
654Pomona College Table Mtn. Obs. in southern California, 1 in MPEC 2018-E06 -- 66391
D29Purple Mtn. Obs. Xuyi Station in China, 1 in MPEC 2018-E08 -- 2018 DX3
L18QOS Obs., 1 in MPEC 2018-E06 -- 2017 VR12
K61Rokycany Obs. in the Czech Republic, 1 in MPEC 2018-E18 -- 2018 C2
H36Sandlot Obs. in Kansas, 2 in MPECs 2018-E08 & 2018-E11 -- 2018 DX3, 2018 DA4
C95SATINO-1 in France, 1 in MPEC 2018-E18 -- 2018 C2
033Schwarzschild Obs. in Germany, 4 in MPECs 2018-E08, 2018-E15, 2018-E16 & 2018-E18 -- 2018 DX3, 2018 DF4, 2018 DE4, 2018 C2
W881Tony Evans in Portugal via Slooh.com Chile Obs. in Chile, 1 in MPEC 2018-E06 -- 2017 XB2
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2018-E06 -- 2017 VV14
291Spacewatch 1.8m telescope in Arizona, 4 in MPECs 2018-E11, 2018-E12, 2018-E15 & 2018-E17 -- 2018 DE4, 2018 DB4, 2018 DA4, 2017 U7
W34Squirrel Valley Obs. in North Carolina, 4 in MPEC 2018-E06 -- 2017 VR12, 505667, 190208, 162882
I52Steward Obs. Mt. Lemmon Station in Arizona, 11 in MPECs 2018-E06, 2018-E07, 2018-E08, 2018-E09, 2018-E10, 2018-E11, 2018-E12, 2018-E13, 2018-E15, 2018-E16 & 2018-E18 -- 2018 DZ3, 2018 DY3, 2018 DX3, 2018 DW3, 2018 DF4, 2018 DE4, 2018 DC4, 2018 DB4, 2018 DA4, 2018 C2, 2017 YE5
J22Tacande Obs. in the Canary Islands, 1 in MPEC 2018-E18 -- 2018 C2
W33Transit Dreams Obs., 2 in MPEC 2018-E06 -- 2017 VR12, 3122
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2018-E06 -- 192559
T09UH/Tholen NEO Follow-Up Subaru Telescope in Hawaii, 1 in MPEC 2018-E05 -- 2014 KV86
L01Visnjan Obs., 1 in MPEC 2018-E15 -- 2018 DE4
C51WISE in Earth polar orbit, 2 in MPEC 2018-E06 -- 85990, 496837
C42Xingming Obs. in China, 1 in MPEC 2018-E18 -- 2018 C2
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 4 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 DZ3NEODyS23262068-211352.99e-06-6.49-6.590NEODyS: "Based on 18 optical observations (of which 0 are rejected as outliers) from 2018-02-26.230 to 2018-03-01.309."
JPL Sentry20302068-211334.124e-06-6.36-6.440JPL: Computed at 12:03 today Pacific time based on 18 observations spanning 3.0788 days (2018-Feb-26.2292 to 2018-Mar-01.30798). Diameter approximately 0.018 km. from weighted mean H=26.42.
2017 YV8NEODyS23262061-2117702.94e-05-6.01-6.210NEODyS: "Based on 19 optical observations (of which 0 are rejected as outliers) from 2017-12-22.423 to 2018-01-16.227."

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 4 March '18

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

2326Noted that NEODyS has updated its 2017 YV8 risk assessment - see above
Noted that NEODyS has posted 2018 DZ3 as an impact risk - see above
2258Grabbed MPEC 2018-E18 - A/2018 C2 - see above
2235Grabbed MPEC 2018-E17 - A/2017 U7 - see above
2030Noted that JPL Sentry has posted 2018 DZ3 as an impact risk - see above
1948Generated Traffic Report
1930Grabbed MPEC 2018-E16 - 2018 DF4 - see above
1802Grabbed MPEC 2018-E09 - 2018 DY3 - see above
Grabbed MPEC 2018-E10 - 2018 DZ3 - see above
Grabbed MPEC 2018-E11 - 2018 DA4 - see above
Grabbed MPEC 2018-E12 - 2018 DB4 - see above
Grabbed MPEC 2018-E13 - 2018 DC4 - see above
Grabbed MPEC 2018-E14 - 2018 DD4 - see above
Grabbed MPEC 2018-E15 - 2018 DE4 - see above
1726Grabbed MPEC 2018-E05 - 2014 KV86 - see above
Grabbed MPEC 2018-E06 - Daily Orbit Update - see above
Grabbed MPEC 2018-E07 - 2018 DW3 - see above
Grabbed MPEC 2018-E08 - 2018 DX3 - see above