Contents  on 4 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 4 February '18

Seven objects reported inside ten LD

Today seven asteroids are reported inside ten lunar distances (LD) of Earth. Among the nearest are risk-listed 2018 BP6, inbound from 5.70 to 3.87 LD, 2018 AH12, which comes its closest to our planet on this passage -- 5.31 LD at 1346 UTC, and two newly announced inbound intruders: 2018 CC moves in from 6.69 to 4.37 LD and, further out, 2018 CB comes this way from 8.8 to 7.1 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
0.2   LD Feb. 9* 2018 CB 22 m  7.1 from 8.8 LD yesterday - Feb. 15 NEW, EPU +/- 8.48 hours*, intruder - MPEC
0.5   LD Feb. 6* 2018 CC 17 m  4.4 from 6.7 LD Feb. 2 - 11 NEW, EPU +/- 7 mins.*, intruder - MPEC
0.73 LD Jan. 19 2018 BC 4 m  7.51 to 7.98 LD Dec. 30 - Feb. 9 intruder, NHATS target, risk
3.07 LD Jan. 23 2018 BJ6 7 m  9.58 to 10.35 LD Jan. 12 - today NHATS target, exits ten LD
3.65 LD tomorrow 2018 BP6 41 m  3.87 from 5.70 LD Feb. 2 - 8 risk - DOU
5.31 LD today 2018 AH12 14 m  5.31 LD Jan. 28 - Feb. 12 NHATS target, Earth closest at 1346 UTC - DOU
6.7   LD Jan. 15* 2018 AV2 6 m  7.2 to 7.3 LD Nov. 10 - March 2 EPU +/- 9 mins.*, NHATS target, natural?
* EPU = Earth passage uncertainty

This report was updated at 2308 UTC with the discoveries inbound intruders 2018 CC (MPEC) and 2018 CB (MPEC). See details in the traffic table above. Your first flying rocks traffic report was generated at 2051 UTC with first follow-up for departed 2018 BU6 (5.08 days added to 1.99-day discovery arc) in today's DOU MPEC along with continuing follow-up for approaching 2017 VR12, risk-listed inbound 2018 BP6, passing 2018 AH12, and five departed objects: 2018 BH3, 2018 BQ, 2017 YH1, 2017 VT14, and risk-listed intruder 2018 BN6, and for distant objects 2012 OQ (15.99 days added to 0.019-day recovery arc) and 208023 1999 AQ10, plus newly reported observations of 496817 1989 VB from last November and of 441987 2010 NY65 from last June.

Approaching Traffic - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
3.7   LD Feb. 24* 2017 DR109 10 m  32.9 from 34.7 LD Feb. 18 - March 1 EPU +/- 30 mins.*, NHATS target
3.76 LD March 7 2017 VR12 267 m  41.78 from 43.09 LD Feb. 28 - March 13 radar/NHATS target - DOU
6.9   LD March 10* 2015 DK200 26 m  65.3 from 67.6 LD March 6 - 14 EPU +/- 23.45 hours*, NHATS target
* EPU = Earth passage uncertainty


Reading:  There are various reports in the news media again about the passage of unusual NEO 276033 2002 AJ129, which goes by us today at 2131 UTC at 10.95 LD, outside the voluminous ten LD boundary we use for this traffic report. As noted previously, JPL has a statement of facts.



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 objects that have approached Earth within ten LD since A/CC began these traffic reports eleven years ago but are not presently coming so close. 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 4 February '18

The MPC's NEO Confirmation Page has 39 listings

When last checked at 2324 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 39 objects listed. Of these, thirteen were "one nighters." So far The Tracking News has counted a total of 53 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 February '18

Minor Planet Electronic Circulars

As of last check at 2323 UTC, there have been eleven MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2018-C16 - "21:33 UT" - 2002 CB19


MPEC 2018-C15 - "20:51 UT" - 2003 CA4


MPEC 2018-C14 - "20:42 UT" - 2018 BA7


MPEC 2018-C13 - "20:38 UT" - 2018 CC


MPEC 2018-C12 - "20:35 UT" - 2018 CB


MPEC 2018-C11 - "20:30 UT" - 2018 CA


MPEC 2018-C10 - "20:26 UT" - 2018 BB7


MPEC 2018-C09 - "20:21 UT" - 2018 BZ6


MPEC 2018-C08 - "20:18 UT" - 2018 BY6


<< DOU on 4 Feb. '18 >>  MPEC 2018-C07 - "13:03 UT" - Daily Orbit Update


MPEC 2018-C06 - "03:06 UT" - 2014 UK231

Observers  on 4 February '18

A total of 38 observers appear in today's MPECs.

CodeObserver / observatory
Z35Aras de los Olmos Obs. (OAO) in Spain, 36 in MPEC 2018-C07 -- 2014 YC15, 2014 UR116, 96590, 53110, 500749, 496818, 496817, 496816, 495331, 494706, 480934, 457768, 441987, 416584, 415029, 333888, 242211, 232368, 21374, 190208, 190166, 17511, 17182, 16657, 142561, 142040, 141670, 141018, 140158, 137062, 12711, 8037, 7977, 3200, 3122, 2368
T05ATLAS Haleakala in Hawaii, 16 in MPECs 2018-C07, 2018-C11 & 2018-C14 -- 2018 CA, 2018 BA7, 2016 BA39, 508912, 475967, 374851, 36284, 208023, 16657, 163696, 154347, 137052, 12711, 3122, 1981, 1864
T08ATLAS Mauna Loa in Hawaii, 9 in MPEC 2018-C07 -- 2018 BT6, 2018 BP6, 1999 AF4, 507366, 333888, 311554, 265187, 7977, 1627
C77Bernezzo Obs. in Italy, 2 in MPECs 2018-C10 & 2018-C14 -- 2018 BB7, 2018 BA7
160Castelmartini Obs. in Italy, 3 in MPEC 2018-C07 -- 505178, 162472, 8037
703Catalina Sky Survey (CSS) in Arizona, 6 in MPECs 2018-C07, 2018-C10, 2018-C11, 2018-C12, 2018-C13 & 2018-C16 -- 2018 CC, 2018 CB, 2018 CA, 2018 BB7, 2002 CB19, 16657
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 35 in MPECs 2018-C07 & 2018-C09 -- 2018 BZ6, 2018 BZ2, 2018 BY2, 2018 BV1, 2018 BK5, 2018 BK3, 2018 BC6, 2018 AX3, 2018 AT11, 2018 AP12, 2018 AO2, 2018 AN3, 2018 AM18, 2018 AM12, 2018 AL18, 2018 AH2, 2018 AH13, 2018 AE4, 2018 AE13, 2018 AB12, 2017 YW5, 2017 YW4, 2017 YU7, 2017 YO4, 2017 YL6, 2017 YA8, 2017 YA6, 2017 XL62, 2017 XJ1, 2017 WW12, 2017 WP1, 2017 VT14, 2017 TC4, 2017 SS19, 2017 OP19
595Farra d'Isonzo Obs. in Italy, 2 in MPECs 2018-C11 & 2018-C14 -- 2018 CA, 2018 BA7
C73Galati Obs. in Romania, 1 in MPEC 2018-C14 -- 2018 BA7
K88GINOP-KHK in Hungary, 2 in MPECs 2018-C10 & 2018-C14 -- 2018 BB7, 2018 BA7
J95Great Shefford Obs. in England, 5 in MPECs 2018-C10, 2018-C11, 2018-C13, 2018-C14 & 2018-C15 -- 2018 CC, 2018 CA, 2018 BB7, 2018 BA7, 2003 CA4
U699Steven M. Tilley in Louisiana via iTelescope Obs. Auberry in northern California, 1 in MPEC 2018-C14 -- 2018 BA7
H06iTelescope Obs. Mayhill in New Mexico, 2 in MPECs 2018-C11 & 2018-C14 -- 2018 CA, 2018 BA7
H06#M. Suzuki in Japan via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2018-C14 -- 2018 BA7
P93JAXA Space Tracking & Communications Center (JAXA STCC) in Japan, 6 in MPECs 2018-C10, 2018-C11, 2018-C12, 2018-C13, 2018-C14 & 2018-C16 -- 2018 CC, 2018 CB, 2018 CA, 2018 BB7, 2018 BA7, 2002 CB19
695^Spacewatch via Kitt Peak Natl. Obs. (KPNO) in Arizona, 13 in MPEC 2018-C07 -- 2018 BN6, 2018 BM3, 2018 AV, 2018 AT, 2018 AG13, 2017 YT5, 2017 WN28, 2017 RL, 2016 AC65, 2014 BR8, 2012 OQ, 2010 HD33, 2001 XP31
K38M57 Obs. in Italy, 1 in MPEC 2018-C07 -- 2017 VR12
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2018-C09 -- 2018 BZ6
568@Jean-Marc Petit on Mauna Kea in Hawaii, 1 in MPEC 2018-C06 -- 2014 UK231
568_Marco Micheli on Mauna Kea in Hawaii, 1 in MPEC 2018-C08 -- 2018 BY6
G96Mt. Lemmon Survey (MLS) in Arizona, 3 in MPECs 2018-C07, 2018-C09 & 2018-C15 -- 2018 BZ6, 2003 CA4, 159467
K74Muensterschwarzach Obs. in Germany, 1 in MPEC 2018-C14 -- 2018 BA7
C47Nonndorf Obs. in Austria, 1 in MPEC 2018-C14 -- 2018 BA7
J69North Obs. in England, 1 in MPEC 2018-C14 -- 2018 BA7
Z80Northolt Branch Obs. in England, 1 in MPEC 2018-C14 -- 2018 BA7
G34Oberfrauendorf Obs. in Germany, 1 in MPEC 2018-C14 -- 2018 BA7
C23Olmen Obs. in Belgium, 1 in MPEC 2018-C14 -- 2018 BA7
F51Pan-STARRS 1 (PS1) in Hawaii, 11 in MPECs 2018-C07, 2018-C08, 2018-C09 & 2018-C10 -- 2018 BZ6, 2018 BY6, 2018 BB7, 2017 YF5, 2017 VX1, 504928, 348314, 22753, 220839, 6050, 1864
K63Pascoli Obs. in Italy, 1 in MPEC 2018-C11 -- 2018 CA
L18QOS Obs., 1 in MPEC 2018-C14 -- 2018 BA7
L04ROASTERR-1 in Romania, 1 in MPEC 2018-C14 -- 2018 BA7
K61Rokycany Obs. in the Czech Republic, 3 in MPECs 2018-C11, 2018-C12 & 2018-C14 -- 2018 CB, 2018 CA, 2018 BA7
204Schiaparelli Obs. in Italy, 4 in MPECs 2018-C07, 2018-C10, 2018-C11 & 2018-C14 -- 2018 CA, 2018 BB7, 2018 BA7, 2018 AW
691Spacewatch 0.9m telescope in Arizona, 12 in MPEC 2018-C07 -- 2018 BZ2, 2018 BY2, 2018 BN6, 2018 BK1, 2018 AG13, 2017 YM6, 2017 YF7, 2017 VX1, 2017 SS19, 2016 SA, 2011 EB7, 2002 LX
291Spacewatch 1.8m telescope in Arizona, 12 in MPECs 2018-C07 & 2018-C13 -- 2018 CC, 2018 BP, 2018 AM12, 2018 AB12, 2017 YH1, 2017 YA8, 2017 SV20, 2017 OP19, 2014 BR8, 2008 EE5, 2006 XF1, 2004 KH15
W34Squirrel Valley Obs. in North Carolina, 2 in MPECs 2018-C07 & 2018-C14 -- 2018 BA7, 2017 QL33
I52Steward Obs. Mt. Lemmon Station in Arizona, 38 in MPECs 2018-C07, 2018-C09, 2018-C10, 2018-C11, 2018-C12, 2018-C13, 2018-C14, 2018-C15 & 2018-C16 -- 2018 CC, 2018 CB, 2018 CA, 2018 BZ6, 2018 BZ2, 2018 BU6, 2018 BT6, 2018 BS1, 2018 BQ1, 2018 BQ, 2018 BP, 2018 BO3, 2018 BN3, 2018 BL5, 2018 BL1, 2018 BK6, 2018 BJ5, 2018 BH6, 2018 BH3, 2018 BG5, 2018 BG1, 2018 BE3, 2018 BB7, 2018 BB5, 2018 BA7, 2018 AM13, 2018 AM12, 2018 AL18, 2018 AJ12, 2018 AH12, 2018 AG13, 2018 AD4, 2017 YM6, 2017 YF5, 2017 YE5, 2017 XQ2, 2003 CA4, 2002 CB19
926Tenagra II Obs. in Arizona, 2 in MPECs 2018-C10 & 2018-C14 -- 2018 BB7, 2018 BA7
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2018-C07 -- 2017 YE8
L01Visnjan Obs., 3 in MPECs 2018-C11, 2018-C14 & 2018-C15 -- 2018 CA, 2018 BA7, 2003 CA4
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 4 February '18

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2323 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 BP6JPL Sentry18002074-207416.891e-08-6.94-6.940JPL: Computed at 09:43 today Pacific time based on 53 observations spanning 7.1957 days (2018-Jan-27.35282 to 2018-Feb-03.54855). Diameter approximately 0.041 km. from weighted mean H=24.58.
2018 BN6JPL Sentry18002077-2117251.8194974e-05-5.82-6.050JPL: Computed at 09:54 today Pacific time based on 45 observations spanning 8.2461 days (2018-Jan-27.19371 to 2018-Feb-04.43985). Diameter approximately 0.015 km. from weighted mean H=26.77.
2018 BPJPL Sentry1800R E M O V E DJPL: Risk listing removed at 1739 UTC today
2018 AE4JPL Sentry17322110-211017.102e-08-7.19-7.190JPL: Computed at 08:53 today Pacific time based on 68 observations spanning 21.808 days (2018-Jan-13.46201 to 2018-Feb-04.27035). Diameter approximately 0.040 km. from weighted mean H=24.66.
2017 YE8JPL Sentry17322112-211215.217e-08-7.74-7.740JPL: Computed at 09:04 today Pacific time based on 24 observations spanning 17.125 days (2017-Dec-29.28539 to 2018-Jan-15.410791). Diameter approximately 0.027 km. from weighted mean H=25.53.

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 February '18

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

2308Updated Traffic Report
2200Grabbed MPEC 2018-C16 - 2002 CB19 - see above
2100Grabbed MPEC 2018-C12 - 2018 CB - see above
Grabbed MPEC 2018-C13 - 2018 CC - see above
Grabbed MPEC 2018-C14 - 2018 BA7 - see above
Grabbed MPEC 2018-C15 - 2003 CA4 - see above
2036Grabbed MPEC 2018-C08 - 2018 BY6 - see above
Grabbed MPEC 2018-C09 - 2018 BZ6 - see above
Grabbed MPEC 2018-C10 - 2018 BB7 - see above
Grabbed MPEC 2018-C11 - 2018 CA - see above
1800Noted that JPL Sentry has updated its 2018 BN6 risk assessment - see above
Noted that JPL Sentry has removed 2018 BP as an impact risk - see above
Noted that JPL Sentry has updated its 2018 BP6 risk assessment - see above
1732Noted that JPL Sentry has updated its 2017 YE8 risk assessment - see above
Noted that JPL Sentry has posted 2018 AE4 as an impact risk - see above
1650Grabbed MPEC 2018-C07 - Daily Orbit Update - see above
0453Grabbed MPEC 2018-C06 - 2014 UK231 - see above