Contents  on 10 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 10 September '18

Fifteen objects reported inside ten LD

Fifteen minor planets are reported within ten lunar distances (LD) of our home world today. Intruder 2018 RC is the nearest but leaves the Earth-Moon system, moving out from 0.82 to 1.82 LD from Earth, passing the Moon at 0.95 LD. And 2018 RA1 comes its closest to us on this passage, reaching 2.40 LD at 2346 UTC, just inside Earth's sphere of gravitational influence.

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
0.44 LD Sept. 7 2018 RJ3 9 m  3.88 to 5.70 LD Sept. 2 - 13 NEW, intruder, risk - MPEC
0.44 LD Sept. 8 2018 RW 3 m  2.43 to 3.75 LD Aug. 31 - Sept. 15 intruder, NHATS target, risk
0.58 LD yesterday 2018 RC 36 m  0.82 to 1.82 LD Aug. 31 - Sept. 18 intruder today, NHATS target, Moon closest 0.95 LD at 1056 UTC - DOU
0.94 LD Sept. 3 2018 RR1 4 m  6.15 to 7.14 LD Aug. 24 - Sept. 13 intruder, NHATS target, risk - DOU
0.99 LD Sept. 6 2018 RE2 7 m  7.03 to 8.95 LD Sept. 1 - 11 intruder
1.47 LD Sept. 5 2018 RB2 12 m  9.09 to 11.14 LD Aug. 31 - today exits ten LD, risk - DOU
1.84 LD Sept. 13 2018 RE3 12 m  6.10 from 8.32 LD yesterday - Sept. 17 NEW - MPEC
1.9   LD Sept. 5* 2018 RH3 22 m  8.9 to 10.8 LD Aug. 31 - today NEW, EPU +/- 8 mins.*, exits ten LD, risk - MPEC
1.99 LD Sept. 6 2018 RR 10 m  7.35 to 9.31 LD Sept. 1 - 11 NHATS target
1.99 LD Sept. 7 2018 RF3 14 m  5.02 to 7.11 LD Sept. 3 - 12 NEW - MPEC
2.40 LD today 2018 RA1 18 m  2.40 LD Sept. 6 - 15 Earth closest at 2346 UTC
2.45 LD tomorrow 2018 RB1 10 m  2.68 from 3.80 LD Sept. 6 - 16 NHATS target - DOU
4.01 LD today 2018 RF2 9 m  4.01 LD Sept. 6 - 14 Earth closest at 0857 UTC
5.83 LD Sept. 5 2018 RO 22 m  8.90 to 10.03 LD Aug. 30 - today exits ten LD
7.80 LD Aug. 23 2018 PU23 8 m  9.44 to 9.60 LD Aug. 7 - Sept. 13 NHATS target, risk

This report was generated at 2112 UTC with five discoveries: inbound 2018 RE3 (MPEC), three outbound objects: 2018 RF3 (MPEC) and two risk-listed 2018 RH3 (MPEC) and intruder 2018 RJ3 (MPEC), which flew by Earth at 0.44 LD and the Moon at 0.78 LD on September 7th, and already departed 2018 RG3 (MPEC), which went by at 9.02 LD on the 6th. Today's DOU MPEC has follow-up for seven objects in the active traffic tables (above and below), as well as for eight departed objects: 2018 RD2, 2018 RO1, 2018 RN1, 2018 RZ, 2018 QW1, 2018 QZ, 2018 QX, and 2018 LQ2, plus distant 450894 2008 BT18

Approaching Traffic - sorted by 10-LD bubble entry date
4.1   LD Sept. 24* 2018 RQ1 50 m  10.4 from 11.1 LD tomorrow - Oct. 8 EPU +/- 9 mins.*, NHATS target, risk - DOU
8.01 LD Sept. 16 2018 RA2 26 m  14.62 from 16.45 LD Sept. 13 - 19 NHATS target - DOU
9.74 LD Sept. 15 2018 RQ2 90 m  17.09 from 19.84 LD Sept. 14 - 16 DOU
8.50 LD Sept. 20 2017 SL16 23 m  16.45 from 17.67 LD Sept. 17 - 24 NHATS target
* EPU = Earth passage uncertainty



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. "Distant" is used here to describe an object that has approached Earth within ten LD since A/CC began these traffic reports eleven years ago but is not currently coming so close. 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 10 September '18

The MPC's NEO Confirmation Page has 41 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 41 objects listed. Of these, eleven were "one nighters." So far The Tracking News has counted a total of 64 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 10 September '18

Minor Planet Electronic Circulars

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


MPEC 2018-R106 - "16:15 UT" - 2018 RJ3


MPEC 2018-R105 - "16:11 UT" - 2018 RE3


MPEC 2018-R104 - "16:07 UT" - 2018 RH3


MPEC 2018-R103 - "16:02 UT" - 2018 RG3


MPEC 2018-R102 - "15:58 UT" - 2018 RF3


<< DOU on 10 Sept. '18 >>  MPEC 2018-R101 - "12:04 UT" - Daily Orbit Update


MPEC 2018-R100 - "10:34 UT" - 2018 RC3


MPEC 2018-R99 - "10:31 UT" - 2018 RB3


MPEC 2018-R98 - "10:28 UT" - 2018 RA3


MPEC 2018-R97 - "10:25 UT" - 2018 RZ2


MPEC 2018-R96 - "10:21 UT" - 2018 RY2


MPEC 2018-R95 - "00:25 UT" - 2016 HX3


MPEC 2018-R94 - "00:05 UT" - 2016 WZ7

Observers  on 10 September '18

A total of 33 observers appear in today's MPECs.

CodeObserver / observatory
K82Alphard Obs., 1 in MPEC 2018-R101 -- 2018 RC
E23Arcadia Obs. in New South Wales, 1 in MPEC 2018-R104 -- 2018 RH3
H21Astronomical Research Obs. Westfield in Illinois, 14 in MPEC 2018-R101 -- 2018 RB, 2018 QV1, 2018 QU1, 2018 PU7, 2018 OB, 2018 NO4, 2018 NO1, 2018 NG4, 2018 NG2, 2018 MH, 2018 ME5, 2018 LP5, 2018 KE3, 2018 GA5
T05ATLAS Haleakala in Hawaii, 47 in MPECs 2018-R101, 2018-R104 & 2018-R106 -- 2018 RY, 2018 RM, 2018 RJ3, 2018 RH3, 2018 QW1, 2018 QV1, 2018 MM8, 2018 LQ2, 2018 KE3, 2015 RJ83, 2013 EP41, 2011 UA, 2008 RT26, 2007 RX19, 2005 RB, 2003 RC2, 2001 SC170, 87311, 450894, 438429, 337248, 333889, 326386, 31345, 267729, 253062, 250697, 21277, 18882, 18109, 180186, 17511, 17274, 163132, 162168, 140039, 137125, 13553, 12711, 11500, 8201, 6456, 5786, 5751, 5653, 4183, 719
T08ATLAS Mauna Loa in Hawaii, 4 in MPEC 2018-R101 -- 88263, 54401, 16834, 1981
160Castelmartini Obs. in Italy, 6 in MPEC 2018-R101 -- 2018 QW1, 2018 QU1, 2018 LQ2, 2005 RB, 438429, 17274
703Catalina Sky Survey (CSS) in Arizona, 50 in MPECs 2018-R101, 2018-R102 & 2018-R105 -- 2018 RY, 2018 RQ1, 2018 RM, 2018 RF3, 2018 RE3, 2018 RD1, 2018 QT, 2018 LZ5, 2018 KE3, 2015 AX16, 2014 SK260, 2014 PG51, 2012 UV27, 2011 UA, 2011 GA62, 2009 SX1, 2004 QB17, 2003 RM, 2002 PH80, 2001 SC170, 2001 QA143, 1999 VQ11, 69230, 65733, 516976, 504800, 495615, 481542, 481394, 457260, 418929, 414903, 382459, 369986, 344756, 337248, 333889, 250162, 163818, 162149, 159495, 155340, 153591, 153002, 13553, 105140, 9856, 6456, 5143, 1865
V06Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) in Arizona, 14 in MPECs 2018-R95, 2018-R98 & 2018-R101 -- 2018 RR1, 2018 RD2, 2018 RA3, 2018 QZ, 2018 QR, 2018 PU7, 2018 PL23, 2018 PJ10, 2018 PG22, 2018 LX15, 2018 LU15, 2016 HX3, 2014 QJ433, 2012 MU2
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 11 in MPECs 2018-R94, 2018-R97, 2018-R98, 2018-R99, 2018-R100, 2018-R101, 2018-R102, 2018-R104, 2018-R105 & 2018-R106 -- 2018 RZ2, 2018 RR1, 2018 RQ1, 2018 RJ3, 2018 RH3, 2018 RF3, 2018 RE3, 2018 RC3, 2018 RB3, 2018 RA3, 2016 WZ7
151Eschenberg Obs. in Switzerland, 3 in MPECs 2018-R101, 2018-R102 & 2018-R104 -- 2018 RH3, 2018 RF3, 2011 UA
595Farra d'Isonzo Obs. in Italy, 5 in MPECs 2018-R100, 2018-R101, 2018-R102, 2018-R103 & 2018-R104 -- 2018 RO2, 2018 RH3, 2018 RG3, 2018 RF3, 2018 RC3
K83Forti Obs., 1 in MPEC 2018-R101 -- 2018 RQ2
A17Guidestar Obs. in Germany, 6 in MPECs 2018-R101, 2018-R102 & 2018-R103 -- 2018 RQ1, 2018 RM, 2018 RL2, 2018 RG3, 2018 RF3, 2018 LQ2
Q62`Steven M. Tilley in Louisiana via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-R101 -- 2018 RQ1
K30Luscherz Obs. in Switzerland, 1 in MPEC 2018-R104 -- 2018 RH3
Z22MASTER IAC Obs. in the Canary Islands, 2 in MPEC 2018-R101 -- 481542, 9856
711McDonald Obs. in Texas, 1 in MPEC 2018-R103 -- 2018 RG3
108Montelupo Obs. in Italy, 1 in MPEC 2018-R101 -- 2018 RC
474Mt. John Obs. in New Zealand, 3 in MPECs 2018-R96, 2018-R97 & 2018-R101 -- 2018 RZ2, 2018 RY2, 2005 FG
G96Mt. Lemmon Survey (MLS) in Arizona, 47 in MPECs 2018-R95, 2018-R96, 2018-R97, 2018-R98, 2018-R99, 2018-R100, 2018-R101 & 2018-R103 -- 2018 RZ2, 2018 RY2, 2018 RL2, 2018 RG3, 2018 RC3, 2018 RB3, 2018 RA3, 2018 QO1, 2018 QE1, 2018 PS23, 2018 OB1, 2016 HX3, 2015 AX16, 2013 PA7, 2011 GQ61, 2010 EX119, 2009 UX17, 2009 SV17, 2008 UV91, 2007 TK8, 2005 CJ, 2004 QB17, 2004 LH, 2003 RM, 2001 SK276, 2001 QA143, 1999 FP19, 69230, 68950, 65733, 55408, 514568, 481394, 457260, 418929, 414903, 413002, 382459, 344756, 224926, 213869, 162215, 155334, 154330, 137427, 12538, 5143
C47Nonndorf Obs. in Austria, 1 in MPEC 2018-R101 -- 2018 QU1
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2018-R101 -- 2016 WZ7
D29Purple Mtn. Obs. Xuyi Station in China, 7 in MPEC 2018-R101 -- 2018 JC3, 419022, 302591, 243298, 17511, 163373, 5653
104San Marcello Pistoiese Obs. in Italy, 8 in MPECs 2018-R97, 2018-R99, 2018-R100, 2018-R101, 2018-R102, 2018-R103, 2018-R104 & 2018-R105 -- 2018 RZ2, 2018 RH3, 2018 RG3, 2018 RF3, 2018 RE3, 2018 RC3, 2018 RC, 2018 RB3
H36Sandlot Obs. in Kansas, 6 in MPECs 2018-R99, 2018-R102, 2018-R103, 2018-R104, 2018-R105 & 2018-R106 -- 2018 RJ3, 2018 RH3, 2018 RG3, 2018 RF3, 2018 RE3, 2018 RB3
C95SATINO-1 in France, 1 in MPEC 2018-R101 -- 1865
W881Tony Evans in Portugal via Slooh.com Chile Obs. in Chile, 1 in MPEC 2018-R101 -- 2018 RQ1
Y00SONEAR in Brazil, 1 in MPEC 2018-R101 -- 99799
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2018-R101 -- 2007 HG44
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2018-R101 -- 2018 QX
I52Steward Obs. Mt. Lemmon Station in Arizona, 36 in MPECs 2018-R96, 2018-R98, 2018-R99, 2018-R100, 2018-R101, 2018-R102, 2018-R103, 2018-R104, 2018-R105 & 2018-R106 -- 2018 RZ1, 2018 RZ, 2018 RY2, 2018 RY1, 2018 RY, 2018 RX, 2018 RU1, 2018 RT1, 2018 RS1, 2018 RQ1, 2018 RO1, 2018 RN1, 2018 RM, 2018 RL, 2018 RJ3, 2018 RH3, 2018 RG3, 2018 RF3, 2018 RE3, 2018 RD1, 2018 RC3, 2018 RB3, 2018 RB2, 2018 RB1, 2018 RA3, 2018 RA2, 2018 QT, 2018 PX23, 2018 PT21, 2018 PJ22, 2018 PG9, 2018 NN, 2016 JN, 2014 TG17, 2014 MP60, 2008 UV91
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 3 in MPEC 2018-R101 -- 2018 RQ1, 2018 RC, 2018 RB2
L01Visnjan Obs., 9 in MPECs 2018-R97, 2018-R98, 2018-R99, 2018-R100, 2018-R102, 2018-R103, 2018-R104, 2018-R105 & 2018-R106 -- 2018 RZ2, 2018 RJ3, 2018 RH3, 2018 RG3, 2018 RF3, 2018 RE3, 2018 RC3, 2018 RB3, 2018 RA3
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 10 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 RJ3JPL Sentry18302061-207035.69221e-06-6.73-6.760JPL: Computed at 10:31 today Pacific time based on 20 observations spanning .80307 days (2018-Sep-09.56735 to 2018-Sep-10.37042). Diameter approximately 0.009 km. from weighted mean H=27.83.
2018 RH3JPL Sentry18302087-2110178.52100888e-05-4.84-4.890JPL: Computed at 10:38 today Pacific time based on 38 observations spanning 1.0979 days (2018-Sep-09.43937 to 2018-Sep-10.53723). Diameter approximately 0.022 km. from weighted mean H=25.96.
2018 RB2JPL Sentry16412092-2117293.67605199e-05-5.85-6.170JPL #2 for the day: Computed at 09:03 today Pacific time based on 37 observations spanning 2.9601 days (2018-Sep-07.26955 to 2018-Sep-10.22966). Diameter approximately 0.012 km. from weighted mean H=27.30.
NEODyS15332092-2118933.18e-05-5.92-6.35-NEODyS: "Based on 29 optical observations (of which 0 are rejected as outliers) from 2018-09-07.270 to 2018-09-09.018."
2018 RY1JPL Sentry16412030-2112638.621974e-07-5.73-6.420JPL #2 for the day: Computed at 09:35 today Pacific time based on 32 observations spanning 3.0365 days (2018-Sep-07.13874 to 2018-Sep-10.17522). Diameter approximately 0.047 km. from weighted mean H=24.28.
NEODyS15332027-2112382.18e-07-6.08-6.660NEODyS: "Based on 28 optical observations (of which 0 are rejected as outliers) from 2018-09-07.140 to 2018-09-09.316."
2018 RS1NEODyS1533206512.76e-09-7.95-7.950NEODyS: "Based on 21 optical observations (of which 0 are rejected as outliers) from 2018-09-06.325 to 2018-09-08.946."
2018 RR1JPL Sentry15332083-2118141.828801e-05-7.53-7.860JPL: Computed at 07:52 today Pacific time based on 23 observations spanning 2.9204 days (2018-Sep-07.39342 to 2018-Sep-10.31382). Diameter approximately 0.004 km. from weighted mean H=29.88.
NEODyS15332080-2118291.85e-05-7.50-7.93-NEODyS: "Based on 17 optical observations (of which 1 are rejected as outliers) from 2018-09-07.394 to 2018-09-09.307."
2018 RQ1JPL Sentry15332117-211719.802e-09-8.13-8.130JPL: Computed at 08:04 today Pacific time based on 44 observations spanning 3.0323 days (2018-Sep-07.38051 to 2018-Sep-10.4128). Diameter approximately 0.050 km. from weighted mean H=24.15.
2018 RPNEODyS1533R E M O V E D-
2018 QSJPL Sentry16412084-211621.4734e-06-6.64-6.700JPL: Computed at 09:01 today Pacific time based on 61 observations spanning 19.014 days (2018-Aug-18.47984 to 2018-Sep-06.493831). Diameter approximately 0.019 km. from weighted mean H=26.21.

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 10 September '18

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

2112Generated Traffic Report
1830Noted that JPL Sentry has posted 2018 RH3 as an impact risk - see above
Noted that JPL Sentry has posted 2018 RJ3 as an impact risk - see above
1641Noted that JPL Sentry has updated its 2018 QS risk assessment - see above
Noted that JPL Sentry has updated its 2018 RB2 risk assessment - see above
Noted that JPL Sentry has updated its 2018 RY1 risk assessment - see above
Grabbed MPEC 2018-R102 - 2018 RF3 - see above
Grabbed MPEC 2018-R103 - 2018 RG3 - see above
Grabbed MPEC 2018-R104 - 2018 RH3 - see above
Grabbed MPEC 2018-R105 - 2018 RE3 - see above
Grabbed MPEC 2018-R106 - 2018 RJ3 - see above
1533Noted that JPL Sentry has updated its 2018 RB2 risk assessment - see above
Noted that NEODyS has posted 2018 RB2 as an impact risk - see above
Noted that NEODyS has removed 2018 RP as an impact risk - see above
Noted that JPL Sentry has updated its 2018 RQ1 risk assessment - see above
Noted that JPL Sentry has updated its 2018 RR1 risk assessment - see above
Noted that NEODyS has updated its 2018 RR1 risk assessment - see above
Noted that NEODyS has posted 2018 RS1 as an impact risk - see above
Noted that JPL Sentry has updated its 2018 RY1 risk assessment - see above
Noted that NEODyS has posted 2018 RY1 as an impact risk - see above
Grabbed MPEC 2018-R96 - 2018 RY2 - see above
Grabbed MPEC 2018-R97 - 2018 RZ2 - see above
Grabbed MPEC 2018-R98 - 2018 RA3 - see above
Grabbed MPEC 2018-R99 - 2018 RB3 - see above
Grabbed MPEC 2018-R100 - 2018 RC3 - see above
Grabbed MPEC 2018-R101 - Daily Orbit Update - see above
0317Grabbed MPEC 2018-R95 - 2016 HX3 - see above
0017Grabbed MPEC 2018-R94 - 2016 WZ7 - see above