Contents  on 20 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 20 February '18

Nine objects reported inside ten LD

Nine visitors are reported within ten lunar distances (LD) of our planet today. Nearest of these is risk-listed 2018 DB, which is inside Earth's SOI and comes its closest to us on this passage, reaching 2.25 LD at 2050 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
0.92 LD Feb. 15 2018 CD3 6 m  7.06 to 8.72 LD Feb. 9 - 21 intruder, NHATS target
2.23 LD Feb. 15 2018 CU2 9 m  9.81 to 11.75 LD Feb. 10 - 20 exits ten LD
2.25 LD today 2018 DB 10 m  2.25 LD Feb. 18 - 23 Earth closest at 2050 UTC, Moon
closest 2.94 LD at 2316 UTC, risk
3.7   LD Feb. 24* 2017 DR109 10 m  6.5 from 7.9 LD Feb. 18 - March 1 EPU +/- 30 mins.*, NHATS target
5.17 LD Feb. 24 2018 CE14 25 m  9.83 from 11.84 LD today - Feb. 28 NHATS target, enters ten LD
5.36 LD Feb. 27 2018 CU14 9 m  8.27 from 9.05 LD Feb. 18 - March 8
6.08 LD yesterday 2018 CP2 48 m  6.11 to 6.83 LD Feb. 16 - 22
6.66 LD Jan. 15 2018 AV2 6 m  8.61 to 8.72 LD Nov. 10 - March 2 NHATS target, natural?
9.26 LD today 2018 CJ 64 m  9.26 LD yesterday - tomorrow Earth closest at 0725 UTC

This report was generated at 1720 UTC with follow-up in today's DOU MPEC for departed intruder 2018 CB.

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 273 m  20.42 from 21.78 LD Feb. 28 - March 13 radar/NHATS target
9.3   LD March 3* 2018 DC 40 m  21.9 from 23.6 LD March 1 - 5 EPU +/- 32 mins.*
6.9   LD March 10* 2015 DK200 26 m  32.2 from 34.1 LD March 6 - 14 EPU +/- 23.45 hours*, NHATS target
* 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 20 February '18

The MPC's NEO Confirmation Page has 19 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had nineteen objects listed. Of these, nine were "one nighters." So far The Tracking News has counted a total of 24 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 20 February '18

Minor Planet Electronic Circulars

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


MPEC 2018-D32 - "18:08 UT" - 2014 UO231


MPEC 2018-D31 - "18:05 UT" - 2013 UX18


MPEC 2018-D30 - "18:02 UT" - 2013 UW18


MPEC 2018-D29 - "17:17 UT" - 2007 TC434


<< DOU on 20 Feb. '18 >>  MPEC 2018-D28 - "13:04 UT" - Daily Orbit Update


MPEC 2018-D27 - "12:30 UT" - 2018 DG

Observers  on 20 February '18

Eighteen observers appear in today's MPECs.

CodeObserver / observatory
C97Al-Fulaij Obs., 4 in MPEC 2018-D28 -- 505657, 311554, 162882, 6053
T05ATLAS Haleakala in Hawaii, 1 in MPEC 2018-D28 -- 2018 CP14
703Catalina Sky Survey in Arizona, 1 in MPEC 2018-D28 -- 449074
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 8 in MPECs 2018-D27 & 2018-D28 -- 2018 DG, 2018 CZ13, 2018 CC14, 2018 CB14, 2018 CA14, 2018 BZ2, 2018 AM12, 2017 YU7
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2018-D27 -- 2018 DG
K88GINOP-KHK in Hungary, 2 in MPECs 2018-D27 & 2018-D28 -- 2018 DG, 137925
568@Jean-Marc Petit on Mauna Kea in Hawaii, 4 in MPECs 2018-D29, 2018-D30, 2018-D31 & 2018-D32 -- 2014 UO231, 2013 UX18, 2013 UW18, 2007 TC434
932McCarthy Obs. in Connecticut, 1 in MPEC 2018-D27 -- 2018 DG
K74Muensterschwarzach Obs. in Germany, 1 in MPEC 2018-D28 -- 96590
644NEAT's Mt. Palomar telescope in southern California, 2 in MPEC 2018-D28 -- 137925, 137062
Z80Northolt Branch Obs. in England, 1 in MPEC 2018-D28 -- 2018 CB
C23Olmen Obs. in Belgium, 1 in MPEC 2018-D28 -- 162882
J43Oukaimeden Obs. in Morocco, 1 in MPEC 2018-D28 -- 2015 CN62
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2018-D27 -- 2018 DG
K63Pascoli Obs. in Italy, 1 in MPEC 2018-D27 -- 2018 DG
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2018-D27 -- 2018 DG
L01Visnjan Obs., 1 in MPEC 2018-D27 -- 2018 DG
C51WISE in Earth polar orbit, 3 in MPEC 2018-D28 -- 85990, 438017, 136839
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 20 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 DBNEODyS16302068-208824.84e-08-8.46-8.50NEODyS: "Based on 15 optical observations (of which 0 are rejected as outliers) from 2018-02-17.410 to 2018-02-19.218."

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 February '18

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

1838Grabbed MPEC 2018-D30 - 2013 UW18 - see above
Grabbed MPEC 2018-D31 - 2013 UX18 - see above
Grabbed MPEC 2018-D32 - 2014 UO231 - see above
1731Grabbed MPEC 2018-D29 - 2007 TC434 - see above
1720Generated Traffic Report
1630Noted that NEODyS has posted 2018 DB as an impact risk - see above
Grabbed MPEC 2018-D27 - 2018 DG - see above
Grabbed MPEC 2018-D28 - Daily Orbit Update - see above