Contents  on 22 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 22 September '18

Nine objects reported inside ten LD

There are nine Solar-System small bodies reported to be less than ten lunar distances (LD) from Earth today. Nearest is risk-listed 2018 RQ1, which moves in from 4.53 to 4.27 LD.

Neighborhood Traffic - sorted by Earth passage distance, grouped by 2.41, 5.0 & 10.0 LD boundaries
Earth passage I D ~Size Distance today  Inside ten LD Notes
1.37 LD Sept. 19 2018 RF8 24 m  9.91 to 13.44 LD Sept. 16 - 22 Moon buzzer, exits ten LD
1.96 LD Sept. 20 2018 SQ1 16 m  8.02 to 12.14 LD Sept. 17 - 22 NEW, exits ten LD - MPEC
2.41 LD Sept. 17 2018 RK6 9 m  6.90 to 8.25 LD Sept. 10 - 24 NHATS target
3.54 LD Sept. 16 2018 RG8 15 m  8.66 to 10.10 LD Sept. 10 - 22 exits ten LD
4.04 LD Sept. 18 2018 SC1 10 m  7.99 to 9.57 LD Sept. 13 - 23 risk - DOU
4.06 LD Sept. 24 2018 RQ1 51 m  4.27 from 4.53 LD Sept. 11 - Oct. 8 NHATS target, risk - DOU
6.80 LD Sept. 27 2018 SM1 93 m  8.78 from 9.61 LD yesterday - Oct. 3 NHATS target - DOU
8.50 LD Sept. 20 2017 SL16 23 m  8.65 to 9.03 LD Sept. 17 - 24 NHATS target
8.57 LD today 2018 RH6 11 m  8.57 LD Sept. 19 - 26 NHATS target, Earth closest at 2054 UTC

This report was generated at 2217 UTC with the discovery of outbound 2018 SQ1 (MPEC) and with follow-up in today's DOU MPEC for three objects in the above active traffic table and for seven departed objects: 2018 SD1, 2018 RB6, 2018 RT5, 2018 RR5, 2018 RD5, 2018 RG3, and 2018 PN22 (adding 22.36 days to its 2.42-day observing arc).



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 22 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, fifteen were "one nighters." So far The Tracking News has counted a total of 37 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 22 September '18

Minor Planet Electronic Circulars

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


MPEC 2018-S54 - "19:16 UT" - 2018 SQ1


MPEC 2018-S53 - "19:07 UT" - 2018 SP1


<< DOU on 22 Sept. '18 >>  MPEC 2018-S52 - "12:21 UT" - Daily Orbit Update

Observers  on 22 September '18

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

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 9 in MPECs 2018-S52 & 2018-S53 -- 2018 SP1, 2018 SK1, 2018 RG3, 2018 RB4, 2018 RA7, 2018 RA4, 2018 QQ1, 2018 NO1, 2008 WN2
T05ATLAS Haleakala in Hawaii, 31 in MPEC 2018-S52 -- 2018 RX, 2018 RQ1, 2018 NU3, 2018 NB, 2018 MM8, 2018 LZ5, 2015 RJ83, 2005 RB, 2001 RQ17, 68359, 54789, 468684, 455594, 443923, 438429, 350988, 333889, 31345, 250697, 185702, 18109, 17511, 17274, 162168, 9856, 6456, 5751, 4953, 4401, 1627, 719
T08ATLAS Mauna Loa in Hawaii, 10 in MPEC 2018-S52 -- 2018 RP8, 88263, 65996, 54401, 503960, 446924, 16834, 3552, 3200, 1981
703Catalina Sky Survey (CSS) in Arizona, 19 in MPECs 2018-S52 & 2018-S54 -- 2018 SQ1, 2018 RX3, 2018 MM8, 2018 LZ5, 2015 RJ83, 2005 RB, 68359, 518463, 468684, 455594, 443923, 350988, 333889, 250697, 20790, 9856, 5751, 4953, 4401
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2018-S52 -- 2018 QV1
106Crni Vrh Obs. in Slovenia, 1 in MPEC 2018-S52 -- 67399
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 2 in MPEC 2018-S52 -- 2018 PE22, 144922
006Fabra Obs. in Spain, 1 in MPEC 2018-S52 -- 17274
K83Forti Obs., 3 in MPEC 2018-S52 -- 2011 UA, 457260, 115052
K88GINOP-KHK in Hungary, 2 in MPECs 2018-S53 & 2018-S54 -- 2018 SQ1, 2018 SP1
J95Great Shefford Obs. in England, 1 in MPEC 2018-S52 -- 2018 SM1
W19Kalamazoo Obs. in Michigan, 1 in MPEC 2018-S52 -- 418929
C41MASTER-II Kislovodsk in Russia, 2 in MPEC 2018-S52 -- 1865, 433
G96Mt. Lemmon Survey (MLS) in Arizona, 10 in MPEC 2018-S52 -- 2018 RV5, 2001 QA143, 67399, 66008, 53789, 381564, 275792, 20826, 197588, 3691
0895N.V. Maigurova via Nikolaev Obs. in Ukraine, 5 in MPEC 2018-S52 -- 2018 NU3, 2018 NB, 1999 RB32, 65706, 2061
Z80Northolt Branch Obs. in England, 1 in MPEC 2018-S52 -- 2018 SM1
G34Oberfrauendorf Obs. in Germany, 3 in MPEC 2018-S52 -- 438429, 31345, 162168
C23Olmen Obs. in Belgium, 1 in MPEC 2018-S52 -- 2011 UA
I41Palomar Transient Factory (PTF) in southern California, 11 in MPEC 2018-S52 -- 2018 NB, 2018 KR2, 2011 UA, 2001 RQ17, 67399, 468684, 442742, 422977, 256412, 115052, 4953
F52Pan-STARRS 2 (PS2) in Hawaii, 5 in MPECs 2018-S52 & 2018-S53 -- 2018 SP1, 2008 WP1, 85774, 366470, 250162
K63Pascoli Obs. in Italy, 3 in MPEC 2018-S52 -- 363027, 115052, 1865
K61Rokycany Obs. in the Czech Republic, 7 in MPECs 2018-S52 & 2018-S53 -- 2018 SP1, 2018 SD1, 2018 RS1, 2018 RQ5, 2018 RP8, 2018 RO7, 2018 QV1
104San Marcello Pistoiese Obs. in Italy, 2 in MPECs 2018-S52 & 2018-S53 -- 2018 SP1, 2018 SM1
H36Sandlot Obs. in Kansas, 1 in MPEC 2018-S54 -- 2018 SQ1
C95SATINO-1 in France, 1 in MPEC 2018-S52 -- 2018 RO7
204Schiaparelli Obs. in Italy, 4 in MPECs 2018-S52 & 2018-S53 -- 2018 SP1, 2018 SB1, 2018 RX, 2018 JS1
W34Squirrel Valley Obs. in North Carolina, 2 in MPEC 2018-S52 -- 163818, 6456
I52Steward Obs. Mt. Lemmon Station in Arizona, 51 in MPECs 2018-S52, 2018-S53 & 2018-S54 -- 2018 SZ, 2018 SQ1, 2018 SP1, 2018 SN, 2018 SK, 2018 SD1, 2018 SC1, 2018 SB, 2018 RZ7, 2018 RZ2, 2018 RY7, 2018 RY, 2018 RX7, 2018 RX6, 2018 RX3, 2018 RW7, 2018 RW3, 2018 RV1, 2018 RU7, 2018 RU1, 2018 RT7, 2018 RT5, 2018 RT3, 2018 RS5, 2018 RS1, 2018 RR8, 2018 RR5, 2018 RR3, 2018 RQ5, 2018 RP8, 2018 RO8, 2018 RO7, 2018 RN4, 2018 RM2, 2018 RL6, 2018 RK7, 2018 RJ7, 2018 RG7, 2018 RE7, 2018 RD5, 2018 RC8, 2018 RC7, 2018 RC1, 2018 RB8, 2018 RA8, 2018 RA4, 2018 QV1, 2018 PX7, 2018 MR8, 2017 NK, 67399
A16Tentlingen Obs. in Switzerland, 3 in MPEC 2018-S52 -- 443923, 438429, 31345
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 4 in MPEC 2018-S52 -- 2018 PV7, 2018 PN22, 2016 YE3, 2009 UQ5
L01Visnjan Obs., 1 in MPEC 2018-S53 -- 2018 SP1
G33Wickede Obs. in Germany, 2 in MPEC 2018-S52 -- 17274, 13553
718Wiggins Obs. in Utah, 1 in MPEC 2018-S52 -- 2018 SM1
C51WISE in Earth polar orbit, 2 in MPEC 2018-S52 -- 2018 PL9, 52387
754Yerkes Obs. in Wisconsin, 1 in MPEC 2018-S52 -- 2018 RB6
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 22 September '18

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2359 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 SC1JPL Sentry16362099-209912.847e-08-9.11-9.110JPL: Computed at 09:06 today Pacific time based on 25 observations spanning 4.2115 days (2018-Sep-18.22771 to 2018-Sep-22.43923). Diameter approximately 0.010 km. from weighted mean H=27.58.
2018 RJ7JPL Sentry1636R E M O V E DJPL: Risk listing removed at 1611 UTC today

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 22 September '18

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

2217Generated Traffic Report
2002Grabbed MPEC 2018-S53 - 2018 SP1 - see above
Grabbed MPEC 2018-S54 - 2018 SQ1 - see above
1636Noted that JPL Sentry has removed 2018 RJ7 as an impact risk - see above
Noted that JPL Sentry has updated its 2018 SC1 risk assessment - see above
1600Grabbed MPEC 2018-S52 - Daily Orbit Update - see above