Contents  on 7 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 7 February '18

Nine objects reported inside ten LD

Nine Solar-System small bodies are reported to be less than ten lunar distances (LD) from Earth today. Nearest is 2018 CC, which leaves the Earth-Moon system, moving out from 0.62 to 2.78 LD. Within Earth's SOI, 2018 CN comes its closest this time around, reaching 1.27 LD at 0434 UTC, and also its closest to the Moon -- 1.58 LD at 0404 UTC, And risk-listed 2018 CM exits Earth's SOI, going from 2.22 to 3.48 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
0.18 LD Feb. 9 2018 CB 22 m  2.87 from 4.32 LD Feb. 3 - 16 intruder, NHATS target - radar, DOU
0.49 LD yesterday 2018 CC 16 m  0.62 to 2.78 LD Feb. 2 - 11 intruder today, exits Earth SOI - DOU
0.73 LD Jan. 19 2018 BC 4 m  8.91 to 9.38 LD Dec. 30 - Feb. 9 intruder, NHATS target, risk
1.27 LD today 2018 CN 18 m  1.27 LD Feb. 4 - 9 Moon closest 1.58 LD at 0404 UTC,
Earth closest at 0434 UTC - DOU
2.14 LD yesterday 2018 CM 9 m  2.22 to 3.48 LD Feb. 2 - 11 exits Earth SOI, risk
2.34 LD yesterday 2018 CL 27 m  2.79 to 4.15 LD Feb. 1 - 11 NHATS target - DOU
3.66 LD Feb. 5 2018 BP6 41 m  6.10 to 8.77 LD Feb. 2 - 8 risk
5.31 LD Feb. 4 2018 AH12 14 m  5.97 to 6.56 LD Jan. 28 - Feb. 12 NHATS target
6.7   LD Jan. 15* 2018 AV2 6 m  7.4 to 7.5 LD Nov. 10 - March 2 EPU +/- 5 mins.*, NHATS target, natural?

This report was generated at 2210 UTC with the discoveries of approaching objects 2018 CB1 (MPEC) and 2018 CX (MPEC), and of departed 2018 CT (MPEC), which flew by the Moon at 0.97 LD and the Earth at 1.69 LD on February 3rd. Radar observation of intruder 2018 CB has been posted today along with optical follow-up in today's DOU MPEC, which also has first follow-up for passing 2018 CN, outbound 2018 CL, and departed 2018 CH, and continuing follow-up for outbound intruder 2018 CC and departed objects 2018 BU6 and 2018 BQ, plus astrometry from last Novemer for intruder 2017 WA14.

Approaching Traffic - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
5.65 LD Feb. 11 2018 CX 31 m  11.16 from 13.37 LD tomorrow - Feb. 15 NEW - MPEC
9.5   LD Feb. 15* 2018 CB1 27 m  20.6 from 23.0 LD Feb. 13 - 16 NEW, EPU +/- 6 mins.* - MPEC
3.7   LD Feb. 24* 2017 DR109 10 m  27.6 from 29.3 LD Feb. 18 - March 1 EPU +/- 30 mins.*, NHATS target
9.2   LD Feb. 20* 2018 CJ 63 m  44.0 from 47.5 LD Feb. 19 - 21 EPU +/- 6 mins.*
3.76 LD March 7 2017 VR12 267 m  37.84 from 39.16 LD Feb. 28 - March 13 radar/NHATS target
6.9   LD March 10* 2015 DK200 26 m  58.5 from 60.8 LD March 6 - 14 EPU +/- 23.45 hours*, NHATS target
* EPU = Earth passage uncertainty


Reading:  NASA/JPL has a news item about the passage of two recently discovered intruders, 2018 CB and 2018 CC. The University of Arizona reports a NASA-funded project that employs "National Weather Service Doppler radar data and computer models to locate meteorites within hours of their fall," using for example the January 16th Michigan bolide, from which meteorites were found. And a new science paper examines the potential for finding ice in the interiors of near-Earth objects.



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 7 February '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 0747 UTC when the database was dated 6 Feb.

NEOCP Activity  on 7 February '18

The MPC's NEO Confirmation Page has 45 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 45 objects listed. Of these, 21 were "one nighters." So far The Tracking News has counted a total of 67 listings on the NEOCP today.

New MPECs  on 7 February '18

Minor Planet Electronic Circulars

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


MPEC 2018-C41 - "20:37 UT" - 2018 CE1


MPEC 2018-C40 - "20:12 UT" - Retraction of 2018 CU


MPEC 2018-C39 - "19:43 UT" - 2018 CD1


MPEC 2018-C38 - "19:40 UT" - 2018 CC1


MPEC 2018-C37 - "19:36 UT" - 2018 CB1


MPEC 2018-C36 - "19:33 UT" - 2018 CZ


MPEC 2018-C35 - "19:30 UT" - 2018 CY


MPEC 2018-C34 - "19:26 UT" - 2018 CX


MPEC 2018-C33 - "19:23 UT" - 2018 CW


MPEC 2018-C32 - "19:19 UT" - 2018 CV


MPEC 2018-C31 - "19:16 UT" - 2018 CU


MPEC 2018-C30 - "19:12 UT" - 2018 CT


MPEC 2018-C29 - "19:09 UT" - 2018 BH7


MPEC 2018-C28 - "18:54 UT" - 2005 CG41


MPEC 2018-C27 - "17:59 UT" - Comet C/2018 B1 (Lemmon)


<< DOU on 7 Feb. '18 >>  MPEC 2018-C26 - "13:04 UT" - Daily Orbit Update

Observers  on 7 February '18

A total of 34 observers appear in today's MPECs.

CodeObserver / observatory
C97Al-Fulaij Obs., 2 in MPEC 2018-C26 -- 511684, 6053
H21Astronomical Research Obs. Westfield in Illinois, 3 in MPECs 2018-C28, 2018-C31 & 2018-C32 -- 2018 CV, 2018 CU, 2005 CG41
703Catalina Sky Survey (CSS) in Arizona, 28 in MPECs 2018-C26, 2018-C27, 2018-C30, 2018-C34 & 2018-C38 -- 2018 CX, 2018 CT, 2018 CC1, 2018 CB, C/2018 B1, 2017 VH2, 2005 CV38, 1999 AF4, 96315, 511008, 509353, 508861, 495848, 40267, 341816, 333888, 311554, 244977, 174050, 162038, 154652, 153349, 142040, 141484, 136793, 11405, 100926, 2202
V06Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) in Arizona, 5 in MPECs 2018-C26, 2018-C29, 2018-C35 & 2018-C39 -- 2018 CY, 2018 CD1, 2018 BH7, 2018 BC5, 2018 BC3
G58Chabot Obs. in northern California, 1 in MPEC 2018-C26 -- 2018 CB
K87Dettelbach Vineyard Obs. in Germany, 1 in MPEC 2018-C34 -- 2018 CX
113Drebach Obs. in Germany, 2 in MPECs 2018-C34 & 2018-C38 -- 2018 CX, 2018 CC1
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2018-C30 -- 2018 CT
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 2018 CB
J95Great Shefford Obs. in England, 5 in MPECs 2018-C26, 2018-C27, 2018-C30, 2018-C32 & 2018-C34 -- 2018 CX, 2018 CV, 2018 CT, 2018 CN, C/2018 B1
U69.program code "." (23) via iTelescope Obs. Auberry in northern California, 1 in MPEC 2018-C26 -- 2018 CB
H06iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2018-C26 -- 2018 CB
P93JAXA Space Tracking & Communications Center in Japan, 1 in MPEC 2018-C27 -- C/2018 B1
H01Magdalena Ridge Obs. (MRO) in New Mexico, 10 in MPECs 2018-C27, 2018-C28, 2018-C30, 2018-C31, 2018-C32, 2018-C34, 2018-C35, 2018-C37, 2018-C38 & 2018-C41 -- 2018 CY, 2018 CX, 2018 CV, 2018 CU, 2018 CT, 2018 CE1, 2018 CC1, 2018 CB1, C/2018 B1, 2005 CG41
W92MASTER OAFA Obs., 1 in MPEC 2018-C26 -- 1999 AF4
711McDonald Obs. in Texas, 12 in MPECs 2018-C26, 2018-C27, 2018-C28, 2018-C29, 2018-C31, 2018-C32, 2018-C33, 2018-C34, 2018-C38 & 2018-C41 -- 2018 CX, 2018 CW, 2018 CV, 2018 CU, 2018 CE1, 2018 CC1, 2018 BH7, C/2018 B1, 2018 AF4, 2018 AE2, 2017 VO15, 2005 CG41
G84Mt. Lemmon SkyCenter in Arizona, 1 in MPEC 2018-C26 -- 275976
G96Mt. Lemmon Survey (MLS) in Arizona, 25 in MPECs 2018-C26, 2018-C27, 2018-C28, 2018-C31, 2018-C32, 2018-C33, 2018-C35, 2018-C36, 2018-C37, 2018-C39 & 2018-C41 -- 2018 CZ, 2018 CY, 2018 CW, 2018 CV, 2018 CU, 2018 CE1, 2018 CD1, 2018 CB1, 2018 CB, C/2018 B1, 2018 AZ, 2018 AG, 2017 YC2, 2014 VU1, 2011 BM24, 2010 NG3, 2005 CG41, 337228, 307493, 281365, 228587, 163696, 153271, 152931, 137924
Z80Northolt Branch Obs. in England, 2 in MPEC 2018-C26 -- 511684, 153349
G34Oberfrauendorf Obs. in Germany, 3 in MPEC 2018-C26 -- 2018 CL, 2018 BA7, 2017 WA14
I41Palomar Transient Factory (PTF) in southern California, 5 in MPEC 2018-C26 -- 2009 EV, 508871, 508861, 385580, 142348
F51Pan-STARRS 1 (PS1) in Hawaii, 5 in MPECs 2018-C27, 2018-C29, 2018-C33, 2018-C34 & 2018-C41 -- 2018 CX, 2018 CW, 2018 CE1, 2018 BH7, C/2018 B1
L04ROASTERR-1 in Romania, 1 in MPEC 2018-C34 -- 2018 CX
K61Rokycany Obs. in the Czech Republic, 1 in MPEC 2018-C27 -- C/2018 B1
H36Sandlot Obs. in Kansas, 6 in MPECs 2018-C26, 2018-C27, 2018-C28, 2018-C31, 2018-C33 & 2018-C41 -- 2018 CW, 2018 CU, 2018 CE1, C/2018 B1, 2017 XB2, 2005 CG41
204Schiaparelli Obs. in Italy, 3 in MPEC 2018-C26 -- 2018 BT1, 2017 YN3, 2017 VX1
691Spacewatch 0.9m telescope in Arizona, 23 in MPECs 2018-C26, 2018-C28, 2018-C31, 2018-C34, 2018-C35 & 2018-C39 -- 2018 CY, 2018 CX, 2018 CU, 2018 CD1, 2018 BZ2, 2018 BQ, 2018 BP, 2018 AL18, 2018 AG2, 2018 AG13, 2018 AE2, 2017 YR1, 2017 YF7, 2017 XB2, 2017 UX5, 2017 SS19, 2017 SL33, 2017 QV34, 2016 CW31, 2015 DP155, 2011 MU, 2011 EB7, 2005 CG41
291Spacewatch 1.8m telescope in Arizona, 8 in MPECs 2018-C26 & 2018-C29 -- 2018 BX2, 2018 BH7, 2018 BG1, 2018 AF3, 2017 SL14, 2017 QV34, 2009 BL71, 2006 XF1
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2018-C34 -- 2018 CX
I52Steward Obs. Mt. Lemmon Station in Arizona, 24 in MPECs 2018-C26, 2018-C27, 2018-C28, 2018-C30, 2018-C31, 2018-C32, 2018-C33, 2018-C34, 2018-C35, 2018-C36, 2018-C37, 2018-C38, 2018-C39 & 2018-C41 -- 2018 CZ, 2018 CY, 2018 CX, 2018 CW, 2018 CV, 2018 CU, 2018 CT, 2018 CL, 2018 CH, 2018 CE1, 2018 CD1, 2018 CC1, 2018 CB1, 2018 CB, 2018 CA, 2018 BU6, 2018 BT6, 2018 BJ3, 2018 BD6, 2018 BA7, C/2018 B1, 2017 YC2, 2017 YB8, 2005 CG41
J22Tacande Obs. in the Canary Islands, 2 in MPEC 2018-C26 -- 2018 CN, 2018 CL
926Tenagra II Obs. in Arizona, 3 in MPECs 2018-C26 & 2018-C27 -- 2018 CC, 2018 CB, C/2018 B1
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2018-C26 -- 2017 XE62
L01Visnjan Obs., 8 in MPECs 2018-C27, 2018-C28, 2018-C30, 2018-C31, 2018-C32, 2018-C34, 2018-C38 & 2018-C41 -- 2018 CX, 2018 CV, 2018 CU, 2018 CT, 2018 CE1, 2018 CC1, C/2018 B1, 2005 CG41
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 7 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
2002 CB19NEODyS1714R E M O V E D-

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 7 February '18

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

2210Generated Traffic Report
2051Grabbed MPEC 2018-C29 - 2018 BH7 - see above
Grabbed MPEC 2018-C31 - 2018 CU - see above
Grabbed MPEC 2018-C33 - 2018 CW - see above
Grabbed MPEC 2018-C34 - 2018 CX - see above
Grabbed MPEC 2018-C35 - 2018 CY - see above
Grabbed MPEC 2018-C36 - 2018 CZ - see above
Grabbed MPEC 2018-C37 - 2018 CB1 - see above
Grabbed MPEC 2018-C38 - 2018 CC1 - see above
Grabbed MPEC 2018-C39 - 2018 CD1 - see above
Grabbed MPEC 2018-C40 - Retraction of 2018 CU - see above
Grabbed MPEC 2018-C41 - 2018 CE1 - see above
2040Grabbed MPEC 2018-C28 - 2005 CG41 - see above
Grabbed MPEC 2018-C30 - 2018 CT - see above
Grabbed MPEC 2018-C32 - 2018 CV - see above
1830Grabbed MPEC 2018-C27 - Comet C/2018 B1 (Lemmon) - see above
1714Noted that NEODyS has removed 2002 CB19 as an impact risk - see above
1630Grabbed MPEC 2018-C26 - Daily Orbit Update - see above
0747Noted Radar Astrometry database update - see above