Contents  on 26 January '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 26 January '18

Ten objects reported inside ten LD

There are ten minor objects reported to be less than ten lunar distances (LD) from our home world today. Of the four nearest, 2018 BU1 is inbound from 4.33 to 3.11 LD, risk-listed intruder 2018 BC is outbound from 3.23 to 3.70 LD and 2018 BA3 from 3.60 to 4.83 LD, and 2018 BM5 comes its closest to Earth on this passage -- 4.83 LD at 0815 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
0.73 LD Jan. 19 2018 BX 5 m  7.69 to 8.95 LD Jan. 12 - 27 intruder, NHATS target
0.73 LD Jan. 19 2018 BC 4 m  3.23 to 3.70 LD Dec. 30 - Feb. 9 intruder, NHATS target, risk
1.19 LD Jan. 20 2018 BP3 6 m  9.27 to 10.84 LD Jan. 13 - 26 NHATS target, exits ten LD, risk
3.01 LD Jan. 24 2018 BA3 20 m  3.60 to 4.83 LD Jan. 19 - 30 DOU
3.06 LD tomorrow 2018 BU1 41 m  3.11 from 4.33 LD Jan. 23 - 30 DOU
4.64 LD Jan. 23 2018 AJ 40 m  5.58 to 6.35 LD Jan. 16 - 30 NHATS target
4.83 LD today 2018 BM5 11 m  4.83 LD Jan. 22 - 30 Earth closest at 0815 UTC - DOU
6.7   LD Jan. 15* 2018 AV2 6 m  6.8 to 6.9 LD Nov. 10 - March 2 EPU +/- 9 mins.*, NHATS target, natural?
8.10 LD today 2018 AL12 36 m  8.10 LD Jan. 24 - 27 Earth closest at 0225 UTC
9.27 LD tomorrow 2018 BQ 26 m  9.28 from 9.35 LD Jan. 22 - Feb. 1 NHATS target

This report was generated at 2040 UTC with the discoveries of three objects that have already departed our ten-LD traffic reporting sphere, and all of them went by on January 20th: risk-listed 2018 BX5 (MPEC) at 1.68 LD at 1009 UTC, 2018 BY5 (MPEC), 6.45 LD at 2047 UTC, and 2018 BZ5 (MPEC), 6.80 LD at 2325 UTC. Today's DOU MPEC has first follow-up for passing 2018 BM5 and continuing follow-up for inbound 2018 BU1, outbound 2018 BA3, departed 2017 YW3, and distant 208023 1999 AQ10.

Approaching Traffic - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
5.31 LD Feb. 4 2018 AH12 14 m  11.09 from 12.12 LD Jan. 28 - Feb. 12 NHATS target
3.7   LD Feb. 24* 2017 DR109 10 m  50.1 from 52.1 LD Feb. 18 - March 1 EPU +/- 30 mins.*, NHATS target
3.76 LD March 7 2017 VR12 269 m  53.45 from 54.74 LD Feb. 28 - March 13 radar/NHATS target
6.9   LD March 10* 2015 DK200 26 m  87.1 from 89.7 LD March 6 - 14 EPU +/- 23.45 hours*, NHATS target
* EPU = Earth passage uncertainty

Reading:  Gizmodo has an article today entitled "'Potentially Hazardous Asteroid' Does Not Mean What You Think It Does." It is aimed, of course, at the general public and errant journalists and editors, as was another item a few days ago at the Washington Post: "Let's talk about the big scary asteroid that's NOT going to hit Earth."



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. "Distant" is used here to describe an object that has come within ten LD since A/CC began these traffic reports (2007) but presently is not so close. 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 26 January '18

The MPC's NEO Confirmation Page has 65 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 65 objects listed. Of these, 35 were "one nighters." So far The Tracking News has counted a total of 75 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 26 January '18

Minor Planet Electronic Circulars

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


MPEC 2018-B141 - "20:02 UT" - 2018 BW5


MPEC 2018-B140 - "18:02 UT" - 2018 BZ5


MPEC 2018-B139 - "17:58 UT" - 2018 BY5


MPEC 2018-B138 - "17:48 UT" - 2018 BX5


<< DOU on 26 Jan. '18 >>  MPEC 2018-B137 - "13:07 UT" - Daily Orbit Update

Observers  on 26 January '18

A total of 21 observers appear in today's MPECs.

CodeObserver / observatory
T05ATLAS Haleakala in Hawaii, 2 in MPEC 2018-B137 -- 17511, 1980
160Castelmartini Obs. in Italy, 2 in MPEC 2018-B137 -- 2016 AU8, 2007 AT2
703Catalina Sky Survey (CSS) in Arizona, 22 in MPECs 2018-B137 & 2018-B140 -- 2018 BZ5, 2008 DG17, 96590, 504928, 475967, 459386, 36284, 337228, 307493, 225586, 208023, 194126, 185853, 154347, 152931, 137078, 137052, 111253, 6455, 1981, 1866, 1864
V06Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) in Arizona, 3 in MPECs 2018-B137, 2018-B138 & 2018-B141 -- 2018 BX5, 2018 BW5, 2017 YP5
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 3 in MPEC 2018-B137 -- 2018 BX2, 2017 YW3, 2017 UK2
J95Great Shefford Obs. in England, 4 in MPECs 2018-B137 & 2018-B140 -- 2018 BZ5, 2018 BU1, 2018 BM5, 2018 BA3
130Lumezzane Obs. in Italy, 12 in MPEC 2018-B137 -- 2018 AG, 2017 YR1, 2017 YP4, 2015 YR1, 505667, 504928, 385580, 265187, 259802, 228587, 177255, 143992
H01Magdalena Ridge Obs. (MRO) in New Mexico, 2 in MPECs 2018-B138 & 2018-B139 -- 2018 BY5, 2018 BX5
G96Mt. Lemmon Survey (MLS) in Arizona, 15 in MPECs 2018-B137, 2018-B138, 2018-B139, 2018-B140 & 2018-B141 -- 2018 BZ5, 2018 BY5, 2018 BX5, 2018 BW5, 2018 AN12, 2017 TO4, 2008 DG17, 2002 EC3, 194126, 185853, 138175, 137078, 12711, 10150, 1866
Z80Northolt Branch Obs. in England, 3 in MPEC 2018-B137 -- 2018 BU1, 2018 AQ2, 2015 NJ3
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2018-B138 -- 2018 BX5
D29Purple Mtn. Obs. Xuyi Station in China, 3 in MPEC 2018-B137 -- 2017 UR7, 68278, 53110
619Sabadell Obs. in Spain, 1 in MPEC 2018-B137 -- 2018 BU1
H36Sandlot Obs. in Kansas, 1 in MPEC 2018-B138 -- 2018 BX5
G40!M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-B137 -- 2017 YS8
691Spacewatch 0.9m telescope in Arizona, 9 in MPECs 2018-B137 & 2018-B141 -- 2018 BW5, 2018 BP1, 2018 BO1, 2017 YM6, 2017 XC62, 2017 WH14, 2015 FH120, 2010 CR1, 7977
W34Squirrel Valley Obs. in North Carolina, 2 in MPEC 2018-B137 -- 385580, 281365
I52Steward Obs. Mt. Lemmon Station in Arizona, 4 in MPECs 2018-B137, 2018-B138, 2018-B139 & 2018-B140 -- 2018 BZ5, 2018 BY5, 2018 BX5, 2017 WO28
926Tenagra II Obs. in Arizona, 1 in MPEC 2018-B140 -- 2018 BZ5
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2018-B137 -- 2017 WC29
W63UTP Obs., 1 in MPEC 2018-B137 -- 3200
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 26 January '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 BX5JPL Sentry20302090-211591.26875e-06-8.16-8.730JPL: Computed at 12:13 today Pacific time based on 26 observations spanning 2.8793 days (2018-Jan-22.47374 to 2018-Jan-25.353). Diameter approximately 0.005 km. from weighted mean H=28.97.

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 26 January '18

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

2040Generated Traffic Report
2030Noted that JPL Sentry has posted 2018 BX5 as an impact risk - see above
2006Grabbed MPEC 2018-B141 - 2018 BW5 - see above
1837Grabbed MPEC 2018-B140 - 2018 BZ5 - see above
1800Grabbed MPEC 2018-B138 - 2018 BX5 - see above
Grabbed MPEC 2018-B139 - 2018 BY5 - see above
1714Grabbed MPEC 2018-B137 - Daily Orbit Update - see above