Contents  on 30 September '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 30 September '18

Five objects reported inside ten LD

Bulletin - 2101, updated 2355 UTC:  One new discovery of a close passer has been announced.

Earth passageI D~Size~Inside ten LDNotes
6.34 LD at 1307 UTC today2018 SO221 m Sept. 25 - Oct. 5MPEC


Five objects are being tracked within ten lunar distances (LD) of our planet today. Nearest are risk-listed intruder 2018 SD2, heading away from 3.31 to 3.97 LD, and 2018 SF2, outbound from 3.77 to 6.63 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
0.23 LD Sept. 25 2018 SD2 6 m  3.31 to 3.97 LD Sept. 10 - Oct. 10 intruder, NHATS target, risk
3.22 LD yesterday 2018 SF2 40 m  3.77 to 6.63 LD Sept. 27 - Oct. 1
4.06 LD Sept. 24 2018 RQ1 51 m  5.32 to 5.78 LD Sept. 11 - Oct. 8 NHATS target
5.89 LD today 2018 SE2 39 m  5.89 LD Sept. 26 - Oct. 3 Earth closest at 0116 UTC - DOU
6.79 LD Sept. 27 2018 SM1 88 m  7.47 to 8.06 LD Sept. 21 - Oct. 3 NHATS target - DOU
Approaching Traffic - sorted by 10-LD bubble entry date
3.1   LD Oct. 17* 2014 US7 18 m  32.7 from 34.7 LD Oct. 12 - 22 NEW, EPU +/- 3.10 hours*, NHATS target
8.7   LD Oct. 18* 2016 GC221 37 m  57.6 from 60.8 LD Oct. 17 - 20 NEW, EPU +/- 6.07 hours*
7.51 LD Oct. 29 475534 2006 TS7 195 m  119.73 from 124.13 LD Oct. 27 - 31 NEW
* EPU = Earth passage uncertainty

This report was generated at 1919 UTC with follow-up in today's DOU MPEC for passing 2018 SE2, outbound 2018 SM1, and departed objects 2018 RO5 and 2018 LQ2. We are also adding to this reporting three returning objects that will penetrate the ten-LD "bubble" during October.



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 30 September '18

The MPC's NEO Confirmation Page has 43 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 43 objects listed. Of these, nineteen 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 30 September '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-S77 - "22:29 UT" - 2015 ES5


MPEC 2018-S76 - "22:27 UT" - 2015 DV198


MPEC 2018-S75 - "20:40 UT" - 2018 SO2


MPEC 2018-S74 - "20:36 UT" - 2018 SN2


MPEC 2018-S73 - "20:22 UT" - 2018 SM2


<< DOU on 30 Sept. '18 >>  MPEC 2018-S72 - "12:03 UT" - Daily Orbit Update

Observers  on 30 September '18

A total of 32 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 15 in MPEC 2018-S72 -- 2018 SP1, 2018 SK1, 2018 RW3, 2018 RS1, 2018 RL2, 2018 RJ7, 2018 QV1, 2018 QP, 2018 PS23, 2018 PK22, 2018 PE22, 2018 NB, 2018 LZ5, 2018 LQ2, 2018 KE3
T05ATLAS Haleakala in Hawaii, 2 in MPEC 2018-S72 -- 2018 RL2, 2001 RQ17
T08ATLAS Mauna Loa in Hawaii, 3 in MPEC 2018-S72 -- 88263, 455550, 3200
C77Bernezzo Obs. in Italy, 1 in MPEC 2018-S72 -- 2018 SE2
V03Big Water Obs. in Utah, 1 in MPEC 2018-S74 -- 2018 SN2
160Castelmartini Obs. in Italy, 11 in MPECs 2018-S72, 2018-S73 & 2018-S75 -- 2018 SO2, 2018 SM2, 2018 RP8, 2018 KV, 86324, 523619, 518635, 455594, 414960, 413260, 105140
703Catalina Sky Survey (CSS) in Arizona, 38 in MPECs 2018-S72 & 2018-S75 -- 2018 SO2, 2018 RS1, 2018 PE22, 2018 KE3, 2011 UA, 2001 SC170, 2001 RQ17, 1999 RV2, 96590, 481394, 443923, 438429, 418929, 369986, 337248, 31345, 288914, 267729, 253062, 250697, 20790, 18109, 17511, 17274, 163818, 162168, 153591, 137427, 13553, 12711, 115052, 105140, 7358, 5797, 5751, 5143, 3752, 1865
595Farra d'Isonzo Obs. in Italy, 3 in MPECs 2018-S73, 2018-S74 & 2018-S75 -- 2018 SO2, 2018 SN2, 2018 SM2
J95Great Shefford Obs. in England, 2 in MPECs 2018-S74 & 2018-S75 -- 2018 SO2, 2018 SN2
A17Guidestar Obs. in Germany, 4 in MPEC 2018-S72 -- 2018 QP, 2018 PE22, 162168, 155340
695^Spacewatch via Kitt Peak Natl. Obs. (KPNO) in Arizona, 6 in MPEC 2018-S72 -- 2018 RY1, 2018 RF6, 2018 RB7, 2018 RB4, 2018 QW, 2016 CU193
K38M57 Obs. in Italy, 1 in MPEC 2018-S72 -- 2018 SE2
C41MASTER-II Kislovodsk in Russia, 2 in MPEC 2018-S72 -- 18109, 13553
118Modra Obs. in Slovakia, 1 in MPEC 2018-S73 -- 2018 SM2
G96Mt. Lemmon Survey (MLS) in Arizona, 12 in MPEC 2018-S72 -- 2016 RO1, 2006 OT9, 65996, 65706, 54401, 523595, 468481, 446924, 329571, 308043, 285638, 1620
C47Nonndorf Obs. in Austria, 2 in MPEC 2018-S72 -- 2018 SM1, 2018 SE2
Z80Northolt Branch Obs. in England, 1 in MPEC 2018-S72 -- 2018 SM1
G34Oberfrauendorf Obs. in Germany, 2 in MPEC 2018-S72 -- 418929, 18109
I41Palomar Transient Factory in southern California, 1 in MPEC 2018-S72 -- 21277
F52Pan-STARRS 2 (PS2) in Hawaii, 16 in MPECs 2018-S72, 2018-S73 & 2018-S74 -- 2018 SN2, 2018 SM2, 2018 KE3, 2014 WL368, 2014 SD324, 2007 RZ8, 513358, 419022, 410650, 341050, 31345, 17274, 163818, 138155, 11500, 1865
D29Purple Mtn. Obs. Xuyi Station in China, 10 in MPEC 2018-S72 -- 2013 RX80, 419022, 376788, 17511, 17182, 6456, 5786, 5653, 4183, 719
L04ROASTERR-1 in Romania, 1 in MPEC 2018-S72 -- 2018 SM1
C95SATINO-1 in France, 1 in MPEC 2018-S72 -- 18109
204Schiaparelli Obs. in Italy, 1 in MPEC 2018-S75 -- 2018 SO2
691Spacewatch 0.9m telescope in Arizona, 10 in MPECs 2018-S72, 2018-S74 & 2018-S75 -- 2018 SO2, 2018 SN2, 2018 RZ2, 2018 RO5, 2018 RM2, 2018 RL2, 2018 PE22, 2015 TW143, 2006 UL217, 216985
291Spacewatch 1.8m telescope in Arizona, 3 in MPECs 2018-S72 & 2018-S73 -- 2018 SM2, 2018 RB, 2013 PA7
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2018-S74 -- 2018 SN2
C36Starry Wanderer Obs. in Belarus, 1 in MPEC 2018-S72 -- 523788
I52Steward Obs. Mt. Lemmon Station in Arizona, 9 in MPECs 2018-S72, 2018-S74 & 2018-S75 -- 2018 SO2, 2018 SN2, 2018 SK1, 2018 RO7, 2018 RO2, 2018 RB5, 2018 PT20, 2018 PL9, 2018 NO4
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPECs 2018-S76 & 2018-S77 -- 2015 ES5, 2015 DV198
L01Visnjan Obs., 3 in MPECs 2018-S73, 2018-S74 & 2018-S75 -- 2018 SO2, 2018 SN2, 2018 SM2
I15Wishing Star Obs. in Rhode Island, 1 in MPEC 2018-S72 -- 86324
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 30 September '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 RY1JPL Sentry17002040-210434.77115e-08-6.87-6.910JPL: Computed at 07:34 today Pacific time based on 68 observations spanning 23.047 days (2018-Sep-07.13874 to 2018-Sep-30.1853). Diameter approximately 0.045 km. from weighted mean H=24.40.

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 30 September '18

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

2358Grabbed MPEC 2018-S76 - 2015 DV198 - see above
Grabbed MPEC 2018-S77 - 2015 ES5 - see above
2100Grabbed MPEC 2018-S74 - 2018 SN2 - see above
Grabbed MPEC 2018-S75 - 2018 SO2 - see above
2023Grabbed MPEC 2018-S73 - 2018 SM2 - see above
1919Generated Traffic Report
1700Noted that JPL Sentry has updated its 2018 RY1 risk assessment - see above
Grabbed MPEC 2018-S72 - Daily Orbit Update - see above