Contents  on 19 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 19 September '18

Thirteen objects reported inside ten LD

There are thirteen minor planets reported within ten lunar distances (LD) of Earth today. Nearest are 2018 RF8, which buzzes the Moon at 0.60 LD and comes its closet to our planet on this passage, reaching 1.37 LD, and intruder 2018 SC, which leaves Earth's sphere of gravitational influence, outbound from 1.40 to 4.40 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
0.11 LD Sept. 15 2018 SM 4 m  7.07 to 9.37 LD Sept. 11 - 20 intruder
0.70 LD yesterday 2018 SC 9 m  1.40 to 4.40 LD Sept. 15 - 21 intruder, exits Earth SOI - DOU
1.37 LD today 2018 RF8 24 m  1.37 LD Sept. 16 - 22 Moon buzzer, Moon closest 0.60 LD at 0250 UTC, Earth closest at 0537 UTC - DOU
1.52 LD Sept. 16 2018 RB6 23 m  8.63 to 11.64 LD Sept. 12 - 19 exits ten LD
2.03 LD Sept. 16 2018 RN7 11 m  9.49 to 13.58 LD Sept. 14 - 19 exits ten LD
2.41 LD Sept. 17 2018 RK6 9 m  3.28 to 4.36 LD Sept. 10 - 24 NHATS target
2.78 LD Sept. 17 2018 RM7 8 m  7.49 to 11.21 LD Sept. 14 - 19 exits ten LD
3.54 LD Sept. 16 2018 RG8 15 m  4.78 to 5.95 LD Sept. 10 - 22 DOU
4.06 LD Sept. 24 2018 RQ1 51 m  5.29 from 5.75 LD Sept. 11 - Oct. 8 NHATS target, risk - DOU
4.49 LD Sept. 16 2018 RG5 15 m  6.11 to 7.50 LD Sept. 11 - 21 NHATS target
8.00 LD Sept. 16 2018 RA2 27 m  9.24 to 10.44 LD Sept. 13 - 19 NHATS target, exits ten LD
8.50 LD tomorrow 2017 SL16 23 m  8.59 from 8.92 LD Sept. 17 - 24 NHATS target
8.57 LD Sept. 22 2018 RH6 11 m  9.39 from 10.01 LD today - Sept. 26 NHATS target, enters ten LD

This report was generated at 1820 UTC with follow-up in today's DOU MPEC for four objects in the active traffic table here and for three departed objects: 2018 RE4, 2018 PP9, and 2018 LQ2.



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 19 September '18

The MPC's NEO Confirmation Page has 31 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 31 objects listed. Of these, twelve were "one nighters." So far The Tracking News has counted a total of 34 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 19 September '18

Minor Planet Electronic Circulars

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


<< DOU on 19 Sept. '18 >>  MPEC 2018-S39 - "12:06 UT" - Daily Orbit Update

Observers  on 19 September '18

A total of 23 observers appear in today's MPEC.

CodeObserver / observatory
C97Al-Fulaij Obs., 7 in MPEC 2018-S39 -- 2018 LQ2, 2018 KE3, 2007 RX19, 481394, 12711, 2100, 1865
H21Astronomical Research Obs. Westfield in Illinois, 12 in MPEC 2018-S39 -- 2018 SC, 2018 RS7, 2018 RF7, 2018 RE4, 2018 RA7, 2018 QU, 2018 PJ10, 2008 WN2, 2008 TQ2, 276468, 232382, 194386
T05ATLAS Haleakala in Hawaii, 30 in MPEC 2018-S39 -- 2018 PJ22, 2018 NB, 2018 KE3, 2015 FP118, 2012 UV27, 2011 UA, 2011 GA62, 2009 SX1, 2004 QB17, 2002 PH80, 2001 QA143, 86324, 68950, 65733, 53789, 518635, 481394, 457260, 438429, 418929, 363027, 20790, 155334, 115052, 105140, 9856, 6456, 5143, 3691, 1865
T08ATLAS Mauna Loa in Hawaii, 10 in MPEC 2018-S39 -- 2018 RQ1, 2015 RJ83, 2005 RB, 2001 RQ17, 443923, 333889, 18109, 17511, 1627, 719
160Castelmartini Obs. in Italy, 8 in MPEC 2018-S39 -- 2018 RD1, 2018 LQ2, 2018 KE3, 2013 EP41, 2005 RB, 2001 SC170, 518635, 438429
703Catalina Sky Survey (CSS) in Arizona, 38 in MPEC 2018-S39 -- 2018 RL2, 2018 KE3, 2015 FP118, 2015 AX16, 2012 UV27, 2011 UA, 2011 GA62, 2010 VB72, 2007 RX19, 2005 FG, 2004 QJ7, 2004 QB17, 2003 RM, 2002 PH80, 2001 SC170, 1999 VQ11, 481542, 481394, 457260, 438429, 418929, 414903, 337248, 250162, 216985, 21088, 163818, 162168, 138815, 137805, 137427, 13553, 12538, 115052, 9856, 7358, 5143, 1865
V06Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) in Arizona, 2 in MPEC 2018-S39 -- 2018 GJ1, 2017 KE35
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 5 in MPEC 2018-S39 -- 2018 RX1, 2018 RT1, 2018 RC2, 2018 PP9, 2018 PP23
W19Kalamazoo Obs. in Michigan, 2 in MPEC 2018-S39 -- 2011 UA, 17274
K85Kelmis Obs., 1 in MPEC 2018-S39 -- 144332
Z22MASTER IAC Obs. in the Canary Islands, 1 in MPEC 2018-S39 -- 445267
711McDonald Obs. in Texas, 2 in MPEC 2018-S39 -- 2018 RL, 2018 FO5
G96Mt. Lemmon Survey (MLS) in Arizona, 15 in MPEC 2018-S39 -- 2018 PT20, 2018 NO4, 2018 JS1, 2016 TZ56, 2015 UC67, 2006 OT9, 2002 CY9, 68359, 65996, 445267, 413260, 308043, 16834, 162873, 4401
C47Nonndorf Obs. in Austria, 1 in MPEC 2018-S39 -- 2018 RF8
Z80Northolt Branch Obs. in England, 1 in MPEC 2018-S39 -- 2018 RF8
I41Palomar Transient Factory (PTF) in southern California, 10 in MPEC 2018-S39 -- 2018 PE22, 2011 GA62, 2009 SX1, 2003 RM, 468684, 454177, 442742, 382459, 283729, 253062
C95SATINO-1 in France, 1 in MPEC 2018-S39 -- 2012 UV27
G40!M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-S39 -- 504800
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2018-S39 -- 267729
291Spacewatch 1.8m telescope in Arizona, 2 in MPEC 2018-S39 -- 2018 LK2, 2014 DN112
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2018-S39 -- 2001 QA143
I52Steward Obs. Mt. Lemmon Station in Arizona, 4 in MPEC 2018-S39 -- 2018 RG8, 2018 RG6, 2018 RC4, 2018 QP1
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 3 in MPEC 2018-S39 -- 2018 RP1, 2018 PN10, 2017 WG2
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 19 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 RJ7NEODyS15302057-208846.5e-09-6.32-6.50NEODyS: "Based on 36 optical observations (of which 0 are rejected as outliers) from 2018-09-13.263 to 2018-09-18.343."
2018 RP5NEODyS1530210916.18e-10-10.05-10.050NEODyS: "Based on 47 optical observations (of which 1 are rejected as outliers) from 2018-09-13.234 to 2018-09-18.291."
2018 RF5NEODyS15302069-211551.17e-05-6.42-6.670NEODyS: "Based on 48 optical observations (of which 0 are rejected as outliers) from 2018-09-12.241 to 2018-09-18.408."
2018 RQ4NEODyS15302082-211582.56e-06-6.88-7.220NEODyS: "Based on 36 optical observations (of which 0 are rejected as outliers) from 2018-09-11.282 to 2018-09-18.342."
2018 RB2NEODyS15302092-2118824.73e-05-5.76-6.07-NEODyS: "Based on 55 optical observations (of which 0 are rejected as outliers) from 2018-09-07.270 to 2018-09-16.459."
2018 RR1NEODyS15302083-2118371.82e-05-7.58-8.17-NEODyS: "Based on 35 optical observations (of which 1 are rejected as outliers) from 2018-09-07.394 to 2018-09-15.468."
2015 HS182JPL Sentry18002022-21131135.06766e-08-7.40-8.220JPL: Computed at 05:44 April 8th of 2017 Pacific time based on 10 observations spanning 2.9577 days (2015-Apr-18.24103 to 2015-Apr-21.19874). Diameter approximately 0.023 km. from weighted mean H=25.82.

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 19 September '18

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

1820Generated Traffic Report
1800Noted that JPL Sentry has updated its 2015 HS182 risk assessment - see above
1530Noted that NEODyS has updated its 2018 RB2 risk assessment - see above
Noted that NEODyS has updated its 2018 RF5 risk assessment - see above
Noted that NEODyS has updated its 2018 RJ7 risk assessment - see above
Noted that NEODyS has updated its 2018 RP5 risk assessment - see above
Noted that NEODyS has updated its 2018 RQ4 risk assessment - see above
Noted that NEODyS has updated its 2018 RR1 risk assessment - see above
Grabbed MPEC 2018-S39 - Daily Orbit Update - see above