Contents  on 27 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 27 September '18

Four objects reported inside ten LD

Four transient natural objects are reported inside ten lunar distances (LD) of Earth today. The closest, 2018 RQ1, heads out from 4.29 to 4.56 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
4.06 LD Sept. 24 2018 RQ1 51 m  4.29 to 4.56 LD Sept. 11 - Oct. 8 NHATS target
4.30 LD Sept. 24 2018 ST1 32 m  8.55 to 10.98 LD Sept. 20 - 27 exits ten LD, risk
6.51 LD today 2018 SS1 59 m  6.51 LD Sept. 24 - 29 Earth closest at 0309 UTC - DOU
6.79 LD today 2018 SM1 93 m  6.79 LD Sept. 21 - Oct. 3 NHATS target, Earth closest at 1142 UTC - DOU

This report was generated at 2310 UTC with follow-up in today's DOU MPEC for two objects in the accompanying active traffic table plus five departed objects: 2018 RR5, 2018 RE4, 2018 RG3, 2018 RO, and risk-listed 2018 RF5.



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 27 September '18

The MPC's NEO Confirmation Page has 16 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had sixteen objects listed. Of these, nine were "one nighters." So far The Tracking News has counted a total of 26 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 27 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-S65 - "16:09 UT" - 2018 RW27


MPEC 2018-S64 - "15:18 UT" - 2018 SB2


MPEC 2018-S63 - "15:14 UT" - 2018 SA2


<< DOU on 27 Sept. '18 >>  MPEC 2018-S62 - "12:03 UT" - Daily Orbit Update

Observers  on 27 September '18

A total of 43 observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2018-S64 -- 2018 SB2
H21Astronomical Research Obs. Westfield in Illinois, 28 in MPEC 2018-S62 -- 2018 RW7, 2018 RW6, 2018 RW3, 2018 RV7, 2018 RU1, 2018 RR5, 2018 RO7, 2018 RO, 2018 RL6, 2018 RL, 2018 RJ7, 2018 RG3, 2018 RF7, 2018 RF5, 2018 RE4, 2018 RC1, 2018 RA7, 2018 QU, 2018 QR, 2018 QQ1, 2017 QW17, 2017 HW1, 2016 XD1, 2008 VB1, 1998 KH9, 276468, 256670, 153460
T05ATLAS Haleakala in Hawaii, 11 in MPEC 2018-S62 -- 2018 KE3, 88263, 455594, 438429, 31345, 17274, 12711, 105140, 9856, 4953, 3753
T08ATLAS Mauna Loa in Hawaii, 17 in MPEC 2018-S62 -- 2018 NB, 65733, 481542, 481394, 457260, 455594, 418929, 413260, 31345, 21277, 13553, 105140, 9856, 4953, 3552, 1627, 719
C77Bernezzo Obs. in Italy, 1 in MPEC 2018-S62 -- 2018 SM1
160Castelmartini Obs. in Italy, 29 in MPECs 2018-S62 & 2018-S64 -- 2018 SB2, 2018 KE3, 2011 UA, 2001 QA143, 1999 RB32, 86324, 68950, 65733, 65706, 53789, 518635, 481542, 481394, 457260, 438429, 418929, 414960, 413260, 37336, 363027, 349507, 217628, 16834, 163818, 115052, 105140, 6456, 1865, 433
703Catalina Sky Survey in Arizona, 1 in MPEC 2018-S64 -- 2018 SB2
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2018-S65 -- 2018 RW27
106Crni Vrh Obs. in Slovenia, 1 in MPEC 2018-S62 -- 2018 SM1
006Fabra Obs. in Spain, 1 in MPEC 2018-S62 -- 17274
595Farra d'Isonzo Obs. in Italy, 2 in MPECs 2018-S62 & 2018-S64 -- 2018 SM1, 2018 SB2
K83Forti Obs., 2 in MPEC 2018-S62 -- 2011 UA, 438429
K88GINOP-KHK in Hungary, 1 in MPEC 2018-S64 -- 2018 SB2
J95Great Shefford Obs. in England, 4 in MPECs 2018-S62, 2018-S63 & 2018-S64 -- 2018 SS1, 2018 SM1, 2018 SB2, 2018 SA2
A17Guidestar Obs. in Germany, 1 in MPEC 2018-S63 -- 2018 SA2
L28ISON Castelgrande Obs., 1 in MPEC 2018-S62 -- 2018 SM1
Q62iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-S62 -- 2018 RB
U68JPL SynTrack Robotic Telescope, 1 in MPEC 2018-S63 -- 2018 SA2
695^Spacewatch via Kitt Peak Natl. Obs. (KPNO) in Arizona, 2 in MPECs 2018-S62 & 2018-S63 -- 2018 SA2, 2018 QW
Z43Landehen Obs., 3 in MPEC 2018-S62 -- 2018 SM1, 86324, 518635
K38M57 Obs. in Italy, 1 in MPEC 2018-S62 -- 2018 SM1
K32Maritime Alps Obs. in Italy, 1 in MPEC 2018-S62 -- 2018 SM1
C41MASTER-II Kislovodsk in Russia, 1 in MPEC 2018-S62 -- 481542
C94MASTER-II Tunka in Russia, 1 in MPEC 2018-S62 -- 31345
J69North Obs. in England, 3 in MPEC 2018-S62 -- 2018 SS1, 2018 SR1, 2018 SM1
Z80Northolt Branch Obs. in England, 4 in MPEC 2018-S62 -- 2018 SS1, 2018 SR1, 2018 SM1, 433
I41Palomar Transient Factory (PTF) in southern California, 14 in MPEC 2018-S62 -- 2018 SM1, 2018 RL2, 2018 KE3, 2014 SK260, 2011 UA, 2001 QA143, 455550, 31210, 256412, 153591, 13553, 3691, 1943, 1620
F52Pan-STARRS 2 (PS2) in Hawaii, 9 in MPEC 2018-S62 -- 2018 RV5, 2018 PJ22, 2018 NO4, 366470, 34613, 285638, 275792, 16834, 4953
L04ROASTERR-1 in Romania, 1 in MPEC 2018-S62 -- 2011 UA
B04Saint-Barthelemy Obs. in Italy, 1 in MPEC 2018-S63 -- 2018 SA2
104San Marcello Pistoiese Obs. in Italy, 3 in MPECs 2018-S62 & 2018-S64 -- 2018 SB2, 2018 QT, 1999 RB32
H36Sandlot Obs. in Kansas, 1 in MPEC 2018-S64 -- 2018 SB2
C95SATINO-1 in France, 2 in MPEC 2018-S62 -- 2018 SM1, 3691
0948program code 8 via Simeis Obs. in Ukraine, 4 in MPEC 2018-S62 -- 2018 SM1, 2011 UA, 3552, 719
G403Tony Evans in Portugal via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-S62 -- 2018 SM1
291Spacewatch 1.8m telescope in Arizona, 9 in MPECs 2018-S62, 2018-S64 & 2018-S65 -- 2018 SB2, 2018 RW27, 2018 RU3, 2018 RC1, 2018 QT, 2018 QE1, 2018 FY1, 2013 NV, 2011 WM46
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2018-S64 -- 2018 SB2
I52Steward Obs. Mt. Lemmon Station in Arizona, 1 in MPEC 2018-S64 -- 2018 SB2
Z52The Studios Obs., 1 in MPEC 2018-S62 -- 17274
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2018-S62 -- 2018 QT1, 2018 PH22
L01Visnjan Obs., 2 in MPECs 2018-S63 & 2018-S64 -- 2018 SB2, 2018 SA2
718Wiggins Obs. in Utah, 1 in MPEC 2018-S62 -- 2018 SM1
C51WISE in Earth polar orbit, 1 in MPEC 2018-S65 -- 2018 RW27
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 27 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 RF5JPL Sentry15312103-211538.7249e-06-6.53-6.790JPL: Computed at 07:17 today Pacific time based on 51 observations spanning 7.0593 days (2018-Sep-12.23986 to 2018-Sep-19.299119). Diameter approximately 0.011 km. from weighted mean H=27.36.
2015 HV182JPL Sentry15312019-21011891.939777e-07-4.62-5.780JPL: Computed at 13:25 April 6th of 2017 Pacific time based on 9 observations spanning .99953 days (2015-Apr-18.27618 to 2015-Apr-19.27571). Diameter approximately 0.157 km. from weighted mean H=21.70.

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 27 September '18

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

2310Generated Traffic Report
1708Grabbed MPEC 2018-S65 - 2018 RW27 - see above
1531Noted that JPL Sentry has updated its 2015 HV182 risk assessment - see above
Noted that JPL Sentry has updated its 2018 RF5 risk assessment - see above
Grabbed MPEC 2018-S62 - Daily Orbit Update - see above
Grabbed MPEC 2018-S63 - 2018 SA2 - see above
Grabbed MPEC 2018-S64 - 2018 SB2 - see above