Contents  on 23 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 23 September '18

Six objects reported inside ten LD

Six transient natural objects are reported traveling within ten lunar distances (LD) of Earth today. Nearest is 2018 RQ1, which is inbound from 4.27 to 4.11 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
2.41 LD Sept. 17 2018 RK6 9 m  8.25 to 9.61 LD Sept. 10 - 24 NHATS target
4.04 LD Sept. 18 2018 SC1 10 m  9.57 to 11.22 LD Sept. 13 - 23 exits ten LD, risk
4.06 LD tomorrow 2018 RQ1 51 m  4.11 from 4.27 LD Sept. 11 - Oct. 8 NHATS target
6.80 LD Sept. 27 2018 SM1 93 m  8.05 from 8.78 LD Sept. 21 - Oct. 3 NHATS target
8.50 LD Sept. 20 2017 SL16 23 m  9.03 to 9.62 LD Sept. 17 - 24 NHATS target
8.57 LD yesterday 2018 RH6 11 m  8.57 to 8.70 LD Sept. 19 - 26 NHATS target
Approaching Traffic
6.51 LD Sept. 27 2018 SS1 65 m  11.99 from 14.79 LD tomorrow - Sept. 29 NEW - MPEC

This report was updated at 2324 UTC with the discovery of approaching 2018 SS1 (MPEC). Your first neighborhood flying rocks traffic report was generated at 1914 UTC.



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 23 September '18

The MPC's NEO Confirmation Page has 27 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 27 objects listed. Of these, thirteen were "one nighters." So far The Tracking News has counted a total of 30 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 23 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-S58 - "21:18 UT" - 2018 SS1


MPEC 2018-S57 - "21:13 UT" - 2018 SR1


MPEC 2018-S56 - "20:47 UT" - 2004 ST2


<< DOU on 23 Sept. '18 >>  MPEC 2018-S55 - "12:19 UT" - Daily Orbit Update

Observers  on 23 September '18

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

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 2 in MPECs 2018-S56 & 2018-S57 -- 2018 SR1, 2004 ST2
H21Astronomical Research Obs. Westfield in Illinois, 1 in MPEC 2018-S57 -- 2018 SR1
T05ATLAS Haleakala in Hawaii, 13 in MPECs 2018-S55 & 2018-S57 -- 2018 SR1, 2018 PJ22, 2011 UA, 68950, 65733, 457260, 438429, 418929, 163818, 115052, 105140, 6456, 3691
T08ATLAS Mauna Loa in Hawaii, 5 in MPEC 2018-S55 -- 333889, 18109, 4953, 2100, 719
C77Bernezzo Obs. in Italy, 1 in MPEC 2018-S57 -- 2018 SR1
R58Beverly-Begg Obs., 1 in MPEC 2018-S57 -- 2018 SR1
160Castelmartini Obs. in Italy, 2 in MPECs 2018-S56 & 2018-S57 -- 2018 SR1, 2004 ST2
703Catalina Sky Survey (CSS) in Arizona, 12 in MPECs 2018-S55 & 2018-S56 -- 2018 RV5, 2008 RG98, 2004 ST2, 66008, 457260, 422787, 413563, 382459, 16834, 137805, 3752, 3691
309'Martin Altmann in Germany via Cerro Paranal in Chile, 1 in MPEC 2018-S55 -- 2018 RL2
I19El Gato Gris Obs. in Argentina, 1 in MPEC 2018-S57 -- 2018 SR1
595Farra d'Isonzo Obs. in Italy, 2 in MPECs 2018-S56 & 2018-S57 -- 2018 SR1, 2004 ST2
K83Forti Obs., 1 in MPEC 2018-S57 -- 2018 SR1
X31Galilei Obs., 1 in MPEC 2018-S57 -- 2018 SR1
K88GINOP-KHK in Hungary, 2 in MPECs 2018-S56 & 2018-S57 -- 2018 SR1, 2004 ST2
J95Great Shefford Obs. in England, 3 in MPECs 2018-S56, 2018-S57 & 2018-S58 -- 2018 SS1, 2018 SR1, 2004 ST2
L28ISON Castelgrande Obs., 1 in MPEC 2018-S57 -- 2018 SR1
Q62[M. Suzuki in Japan via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-S57 -- 2018 SR1
G96Mt. Lemmon Survey (MLS) in Arizona, 11 in MPECs 2018-S55 & 2018-S58 -- 2018 SS1, 2018 RP8, 2018 RL, 2016 RO1, 2001 QA143, 88263, 54401, 446924, 162510, 140288, 3552
G34Oberfrauendorf Obs. in Germany, 1 in MPEC 2018-S57 -- 2018 SR1
I41Palomar Transient Factory (PTF) in southern California, 6 in MPEC 2018-S55 -- 2018 MM8, 2018 LZ5, 455550, 16816, 13553, 5751
F52Pan-STARRS 2 (PS2) in Hawaii, 5 in MPEC 2018-S55 -- 2018 JD5, 65996, 34613, 308043, 16834
K63Pascoli Obs. in Italy, 2 in MPECs 2018-S57 & 2018-S58 -- 2018 SS1, 2018 SR1
L04ROASTERR-1 in Romania, 1 in MPEC 2018-S57 -- 2018 SR1
K61Rokycany Obs. in the Czech Republic, 1 in MPEC 2018-S57 -- 2018 SR1
247roving observer, 1 in MPEC 2018-S57 -- 2018 SR1
104San Marcello Pistoiese Obs. in Italy, 3 in MPECs 2018-S56, 2018-S57 & 2018-S58 -- 2018 SS1, 2018 SR1, 2004 ST2
C95SATINO-1 in France, 1 in MPEC 2018-S55 -- 2018 RP8
0948program code 8 via Simeis Obs. in Ukraine, 1 in MPEC 2018-S57 -- 2018 SR1
G409B. Lutkenhoner in Germany via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-S57 -- 2018 SR1
Y00SONEAR in Brazil, 1 in MPEC 2018-S57 -- 2018 SR1
W34Squirrel Valley Obs. in North Carolina, 3 in MPECs 2018-S56, 2018-S57 & 2018-S58 -- 2018 SS1, 2018 SR1, 2004 ST2
I52Steward Obs. Mt. Lemmon Station in Arizona, 2 in MPECs 2018-S56 & 2018-S57 -- 2018 SR1, 2004 ST2
L01Visnjan Obs., 2 in MPECs 2018-S57 & 2018-S58 -- 2018 SS1, 2018 SR1
718Wiggins Obs. in Utah, 1 in MPEC 2018-S57 -- 2018 SR1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 23 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 SC1NEODyS1811R E M O V E D-
2018 RJ7NEODyS1811R E M O V E D-
2018 RQ1NEODyS1811R 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 23 September '18

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

2324Updated Traffic Report
2153Grabbed MPEC 2018-S56 - 2004 ST2 - see above
Grabbed MPEC 2018-S57 - 2018 SR1 - see above
Grabbed MPEC 2018-S58 - 2018 SS1 - see above
1811Noted that NEODyS has removed 2018 RJ7 as an impact risk - see above
Noted that NEODyS has removed 2018 RQ1 as an impact risk - see above
Noted that NEODyS has removed 2018 SC1 as an impact risk - see above
Grabbed MPEC 2018-S55 - Daily Orbit Update - see above