Contents  on 29 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 29 September '18

Six objects reported inside ten LD

Six Solar-System small bodies are known to be inside ten lunar distances (LD) of Earth today. Nearest are two newly announced objects: 2018 SF2, which comes its closest to Earth on this passage -- 3.22 LD at 1141 UTC, and risk-listed intruder 2018 SD2, which is outbound from 2.65 to 3.31 LD after passing Earth at 0.23 LD on September 25th (after having lingered in the Earth-Moon system for two-plus days and within our planet's sphere of gravitational influence for almost a week).

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  2.65 to 3.31 LD Sept. 10 - Oct. 10 NEW, intruder, risk - MPEC
3.22 LD today 2018 SF2 40 m  3.22 LD Sept. 27 - Oct. 1 NEW, Earth closest at 1141 UTC - MPEC
4.06 LD Sept. 24 2018 RQ1 51 m  4.91 to 5.32 LD Sept. 11 - Oct. 8 NHATS target
5.89 LD tomorrow 2018 SE2 40 m  5.89 from 6.48 LD Sept. 26 - Oct. 3 NEW - MPEC
6.50 LD Sept. 27 2018 SS1 62 m  8.85 to 11.28 LD Sept. 24 - 29 exits ten LD - DOU
6.79 LD Sept. 27 2018 SM1 89 m  7.05 to 7.47 LD Sept. 21 - Oct. 3 NHATS target - DOU

This report was updated at 2314 UTC with the discovery of three objects less than ten LD from Earth: 2018 SF2 (MPEC), 2018 SE2 (MPEC), and risk-listed intruder 2018 SD2 (MPEC). Your first local flying rocks traffic report was generated at 1940 UTC with follow-up in today's DOU MPEC for outbound objects 2018 SS1 and 2018 SM1 plus astrometry from earlier this month for 2018 RN1.



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 29 September '18

The MPC's NEO Confirmation Page has 30 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 30 objects listed. Of these, twelve were "one nighters." So far The Tracking News has counted a total of 38 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 29 September '18

Minor Planet Electronic Circulars

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


MPEC 2018-S71 - "21:08 UT" - 2018 SF2


MPEC 2018-S70 - "21:03 UT" - 2018 SD2


MPEC 2018-S69 - "20:55 UT" - 2018 SE2


<< DOU on 29 Sept. '18 >>  MPEC 2018-S68 - "12:03 UT" - Daily Orbit Update

Observers  on 29 September '18

A total of 35 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 13 in MPECs 2018-S68 & 2018-S71 -- 2018 SF2, 2018 RY, 2018 RU1, 2018 RS1, 2018 RN1, 2018 QU, 2018 QQ1, 2018 QO1, 2018 PS23, 2018 NO1, 2018 KE3, 2018 JS1, 153951
T05ATLAS Haleakala in Hawaii, 2 in MPECs 2018-S69 & 2018-S70 -- 2018 SE2, 2018 SD2
T08ATLAS Mauna Loa in Hawaii, 15 in MPECs 2018-S68 & 2018-S70 -- 2018 SD2, 2018 KE3, 2011 UA, 86324, 523788, 523619, 438429, 418929, 413260, 363027, 163818, 115052, 105140, 6456, 1865
C77Bernezzo Obs. in Italy, 1 in MPEC 2018-S71 -- 2018 SF2
160Castelmartini Obs. in Italy, 1 in MPEC 2018-S71 -- 2018 SF2
703Catalina Sky Survey (CSS) in Arizona, 13 in MPECs 2018-S68 & 2018-S71 -- 2018 SF2, 2018 KE3, 2001 QA143, 66008, 523619, 455550, 454177, 418929, 162215, 137805, 115052, 1865, 1620
106Crni Vrh Obs. in Slovenia, 2 in MPECs 2018-S69 & 2018-S71 -- 2018 SF2, 2018 SE2
595Farra d'Isonzo Obs. in Italy, 2 in MPECs 2018-S69 & 2018-S71 -- 2018 SF2, 2018 SE2
K88GINOP-KHK in Hungary, 2 in MPECs 2018-S69 & 2018-S70 -- 2018 SE2, 2018 SD2
J95Great Shefford Obs. in England, 4 in MPECs 2018-S68, 2018-S69 & 2018-S71 -- 2018 SR1, 2018 SF2, 2018 SE2, 2018 RP8
L28ISON Castelgrande Obs., 2 in MPECs 2018-S69 & 2018-S71 -- 2018 SF2, 2018 SE2
H06#M. Suzuki in Japan via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2018-S71 -- 2018 SF2
Q62[M. Suzuki in Japan via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-S69 -- 2018 SE2
P93JAXA Space Tracking & Communications Center in Japan, 1 in MPEC 2018-S71 -- 2018 SF2
695^Spacewatch via Kitt Peak Natl. Obs. (KPNO) in Arizona, 6 in MPEC 2018-S68 -- 2018 SK, 2018 RB7, 2018 NT2, 2018 MQ5, 2015 WG9, 446924
K38M57 Obs. in Italy, 2 in MPECs 2018-S68 & 2018-S71 -- 2018 SF2, 2018 RS1
G96Mt. Lemmon Survey (MLS) in Arizona, 4 in MPEC 2018-S68 -- 85804, 516803, 470310, 153195
K74Muensterschwarzach Obs. in Germany, 1 in MPEC 2018-S69 -- 2018 SE2
Z80Northolt Branch Obs. in England, 3 in MPECs 2018-S68 & 2018-S71 -- 2018 SM1, 2018 SF2, 2018 RS1
I41Palomar Transient Factory (PTF) in southern California, 5 in MPECs 2018-S68 & 2018-S69 -- 2018 SS1, 2018 SE2, 442742, 382459, 3552
F52Pan-STARRS 2 (PS2) in Hawaii, 2 in MPEC 2018-S68 -- 2018 NU3, 468684
K63Pascoli Obs. in Italy, 1 in MPEC 2018-S69 -- 2018 SE2
D29Purple Mtn. Obs. Xuyi Station in China, 2 in MPEC 2018-S68 -- 322913, 197588
L04ROASTERR-1 in Romania, 1 in MPEC 2018-S71 -- 2018 SF2
247roving observer, 1 in MPEC 2018-S68 -- 2018 SR1
C95SATINO-1 in France, 1 in MPEC 2018-S68 -- 17511
587Sormano Obs. in Italy, 1 in MPEC 2018-S71 -- 2018 SF2
691Spacewatch 0.9m telescope in Arizona, 13 in MPEC 2018-S68 -- 2018 RU3, 2018 RU1, 2018 RO2, 2018 RM2, 2018 RK3, 2018 RC1, 2018 QV1, 2018 QP, 2018 JC3, 2018 FS3, 418929, 253841, 140333
291Spacewatch 1.8m telescope in Arizona, 8 in MPEC 2018-S68 -- 2018 RY7, 2018 RY, 2018 RT3, 2018 MW6, 2018 EB, 2017 QW17, 2011 GN44, 2011 EJ47
I52Steward Obs. Mt. Lemmon Station in Arizona, 18 in MPECs 2018-S68 & 2018-S71 -- 2018 SZ, 2018 SP1, 2018 SF2, 2018 SB2, 2018 RY7, 2018 RW1, 2018 RT3, 2018 RR3, 2018 RK3, 2018 RD7, 2018 RC8, 2018 RB8, 2018 QP, 2018 PJ9, 2018 NU3, 2018 LZ5, 2018 FO5, 2018 EB
K17Valentines Obs., 1 in MPEC 2018-S68 -- 13553
L01Visnjan Obs., 1 in MPEC 2018-S71 -- 2018 SF2
G33Wickede Obs. in Germany, 2 in MPEC 2018-S68 -- 18109, 17274
718Wiggins Obs. in Utah, 1 in MPEC 2018-S68 -- 2018 SM1
C51WISE in Earth polar orbit, 2 in MPEC 2018-S68 -- 2018 RW27, 155140
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 29 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 SD2JPL Sentry23002044-2118480.000108549567-6.06-6.860JPL: Computed at 15:41 today Pacific time based on 14 observations spanning 1.9228 days (2018-Sep-21.57642 to 2018-Sep-23.49918). Diameter approximately 0.006 km. from weighted mean H=28.64.
2018 RB7NEODyS1805R E M O V E D-
JPL Sentry1530R E M O V E DJPL: Risk listing removed at 1526 UTC today
2018 RF5NEODyS18052103-211531.43e-05-6.33-6.630NEODyS: "Based on 51 optical observations (of which 0 are rejected as outliers) from 2018-09-12.241 to 2018-09-19.300."
2018 RY1NEODyS18052040-209531.37e-07-6.46-6.590NEODyS: "Based on 65 optical observations (of which 0 are rejected as outliers) from 2018-09-07.140 to 2018-09-28.123."

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 29 September '18

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

2314Updated Traffic Report
2300Noted that JPL Sentry has posted 2018 SD2 as an impact risk - see above
2204Grabbed MPEC 2018-S69 - 2018 SE2 - see above
Grabbed MPEC 2018-S70 - 2018 SD2 - see above
Grabbed MPEC 2018-S71 - 2018 SF2 - see above
1805Noted that NEODyS has removed 2018 RB7 as an impact risk - see above
Noted that NEODyS has updated its 2018 RF5 risk assessment - see above
Noted that NEODyS has updated its 2018 RY1 risk assessment - see above
1530Noted that JPL Sentry has removed 2018 RB7 as an impact risk - see above
Grabbed MPEC 2018-S68 - Daily Orbit Update - see above