Contents  on 12 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 12 September '18

Thirteen objects reported inside ten LD

There are thirteen transient natural objects known to be within ten lunar distances (LD) of Earth today. Nearest is 2018 RE3, which enters our planet's sphere of gravitational influence, moving in from 3.97 to 2.21 LD, while several others are not much further away, including newly announced 2018 RR4, which comes its closest this time around -- 3.22 LD at 1258 UTC.

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 10 m  7.53 to 9.36 LD Sept. 2 - 13 intruder, NHATS target, risk - DOU
0.44 LD Sept. 8 2018 RW 3 m  5.07 to 6.39 LD Aug. 31 - Sept. 15 intruder, NHATS target, risk
0.58 LD Sept. 9 2018 RC 36 m  2.91 to 4.03 LD Aug. 31 - Sept. 18 intruder, NHATS target - DOU
0.94 LD Sept. 3 2018 RR1 4 m  8.13 to 9.13 LD Aug. 24 - tomorrow intruder, NHATS target, risk
1.84 LD tomorrow 2018 RE3 13 m  2.21 from 3.97 LD Sept. 9 - 17 NHATS target, enters Earth SOI - DOU
1.99 LD Sept. 7 2018 RF3 14 m  9.25 to 11.43 LD Sept. 3 - 12 exits ten LD
2.28 LD Sept. 9 2018 RD4 7 m  3.96 to 5.13 LD Sept. 2 - 16 NHATS target
2.40 LD Sept. 10 2018 RA1 18 m  3.31 to 5.13 LD Sept. 6 - 15 DOU
2.45 LD yesterday 2018 RB1 10 m  2.56 to 3.54 LD Sept. 6 - 16 NHATS target
3.22 LD today 2018 RR4 13 m  3.22 LD Sept. 7 - 17 NEW, Earth closest at 1258 UTC - MPEC
4.01 LD Sept. 10 2018 RF2 9 m  5.65 to 7.56 LD Sept. 6 - 14
4.06 LD Sept. 24 2018 RQ1 52 m  9.16 from 9.79 LD yesterday - Oct. 8 NHATS target, risk - DOU
7.80 LD Aug. 23 2018 PU23 8 m  9.76 to 9.92 LD Aug. 7 - tomorrow NHATS target, risk

This report was generated at 2114 UTC with the discovery of passing 2018 RR4 (MPEC) and with follow-up in today's DOU MPEC for seven objects active in the traffic tables above and below, and for nine departed objects: 2018 RG3, 2018 RE, 2018 QZ, 2018 LQ2, and including five with impact solutions: 2018 RH3, 2018 RB2, 2018 QW1, 2018 QS, and 2018 PY7 (25.98 days added to 8.80-day observation arc), plus observations from 2015 and 2014 for risk-listed objects 2015 HE183 (3.10 days added to 2.05) and 2014 EU.

Approaching Traffic - sorted by 10-LD bubble entry date
8.00 LD Sept. 16 2018 RA2 26 m  11.30 from 12.89 LD tomorrow - Sept. 19 NHATS target - DOU
9.75 LD Sept. 15 2018 RQ2 90 m  12.34 from 14.56 LD Sept. 14 - 16 DOU
8.50 LD Sept. 20 2017 SL16 23 m  14.10 from 15.25 LD Sept. 17 - 24 NHATS target



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 12 September '18

The MPC's NEO Confirmation Page has 60 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 60 objects listed. Of these, 33 were "one nighters." So far The Tracking News has counted a total of 73 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 12 September '18

Minor Planet Electronic Circulars

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


MPEC 2018-R135 - "17:32 UT" - 1998 UM1 = 2018 RP4

Id. F. Manca


MPEC 2018-R134 - "15:29 UT" - 2018 RR4


MPEC 2018-R133 - "15:25 UT" - 2018 RL4


MPEC 2018-R132 - "15:21 UT" - 2018 RK4


MPEC 2018-R131 - "15:16 UT" - 2018 RQ4


MPEC 2018-R130 - "15:01 UT" - 2018 RP4


MPEC 2018-R129 - "14:56 UT" - 2018 RO4


MPEC 2018-R128 - "14:52 UT" - 2018 RN4


MPEC 2018-R127 - "14:47 UT" - 2018 RM4


<< DOU on 12 Sept. '18 >>  MPEC 2018-R126 - "12:04 UT" - Daily Orbit Update

Observers  on 12 September '18

A total of 39 observers appear in today's MPECs.

CodeObserver / observatory
C97Al-Fulaij Obs., 2 in MPEC 2018-R126 -- 418929, 115052
H21Astronomical Research Obs. Westfield in Illinois, 19 in MPECs 2018-R126, 2018-R128, 2018-R131 & 2018-R133 -- 2018 RQ4, 2018 RN4, 2018 RL4, 2018 RB, 2018 QV1, 2018 QQ1, 2018 PX7, 2018 PU7, 2018 PK10, 2018 NO4, 2016 XD1, 2015 DV180, 2013 YB38, 2013 NT11, 2011 ET4, 2007 UA2, 97725, 276468, 153951
T05ATLAS Haleakala in Hawaii, 8 in MPEC 2018-R126 -- 2018 QU1, 65996, 54401, 53789, 413260, 16834, 144332, 3552
T08ATLAS Mauna Loa in Hawaii, 29 in MPEC 2018-R126 -- 2018 RQ1, 2018 RA4, 2018 QV1, 2018 NB, 2018 MM8, 2018 LQ2, 2015 RJ83, 2013 EP41, 2008 RT26, 2007 RX19, 2003 RC2, 438429, 333889, 326386, 31345, 21277, 18109, 17511, 17274, 162168, 140039, 13553, 12711, 11500, 8201, 6456, 5751, 5653, 719
069Baldone Obs. in Latvia, 1 in MPEC 2018-R126 -- 170891
160Castelmartini Obs. in Italy, 4 in MPEC 2018-R126 -- 2015 AX16, 1999 VQ11, 350988, 333889
703Catalina Sky Survey (CSS) in Arizona, 22 in MPECs 2018-R126 & 2018-R130 -- 2018 RU3, 2018 RP4, 2018 PK24, 2018 PJ22, 2018 LQ2, 2015 FP118, 2006 OT9, 1999 RB32, 96315, 66008, 413563, 413260, 20826, 197588, 16834, 159495, 144332, 115052, 3691, 2061, 1865, 433
V06Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) in Arizona, 2 in MPECs 2018-R128 & 2018-R131 -- 2018 RQ4, 2018 RN4
K65Cesena Obs. in Italy, 1 in MPEC 2018-R126 -- 2018 KE3
W84%program code "%" (14) via DECam in Chile, 2 in MPEC 2018-R126 -- 2015 HE183, 2014 EU
113Drebach Obs. in Germany, 7 in MPEC 2018-R126 -- 2018 RQ2, 2018 RM, 2018 KE3, 2015 FP118, 2011 UA, 2007 RX19, 2005 RB
734Farpoint Obs. in Kansas, 2 in MPECs 2018-R128 & 2018-R132 -- 2018 RN4, 2018 RK4
K83Forti Obs., 2 in MPEC 2018-R126 -- 3552, 433
A17Guidestar Obs. in Germany, 5 in MPEC 2018-R126 -- 2018 RY, 2018 RX, 2018 RM, 2018 RL2, 2018 RA2
Q66JAXA Janess-G in New South Wales, 1 in MPEC 2018-R134 -- 2018 RR4
Z22MASTER IAC Obs. in the Canary Islands, 1 in MPEC 2018-R126 -- 2007 RX19
711McDonald Obs. in Texas, 1 in MPEC 2018-R129 -- 2018 RO4
B67Mirasteilas Obs. in Switzerland, 2 in MPEC 2018-R126 -- 2018 LQ2, 2001 QA143
474Mt. John Obs. in New Zealand, 12 in MPECs 2018-R126 & 2018-R130 -- 2018 RZ1, 2018 RY1, 2018 RQ1, 2018 RP4, 2018 RO2, 2018 RN2, 2018 RJ3, 2018 RH3, 2018 RE, 2018 RC, 2018 RA1, 2018 PV23
G96Mt. Lemmon Survey (MLS) in Arizona, 36 in MPECs 2018-R126, 2018-R127, 2018-R128, 2018-R129, 2018-R131 & 2018-R133 -- 2018 RU3, 2018 RT1, 2018 RS1, 2018 RQ4, 2018 RO4, 2018 RN4, 2018 RM4, 2018 RL4, 2018 RC1, 2018 PX7, 2018 LQ2, 2018 LQ15, 2018 KE3, 2014 RC11, 2008 CB22, 2007 VM243, 2005 FG, 2001 SC170, 96590, 65803, 516454, 490636, 481542, 474706, 438429, 385268, 337248, 244670, 216985, 215188, 141851, 139622, 11398, 9856, 7358, 6456
G34Oberfrauendorf Obs. in Germany, 2 in MPEC 2018-R126 -- 2015 FP118, 6456
I41Palomar Transient Factory (PTF) in southern California, 8 in MPECs 2018-R126 & 2018-R134 -- 2018 RX, 2018 RR4, 2018 PJ22, 2001 SK276, 363067, 337252, 250697, 189973
K63Pascoli Obs. in Italy, 2 in MPECs 2018-R127 & 2018-R129 -- 2018 RO4, 2018 RM4
D29Purple Mtn. Obs. Xuyi Station in China, 14 in MPEC 2018-R126 -- 2018 PE22, 2013 RX80, 2008 RT26, 2008 PH9, 2004 QJ7, 445775, 414960, 288914, 267729, 163364, 140039, 137427, 9856, 5786
L04ROASTERR-1 in Romania, 1 in MPEC 2018-R126 -- 2018 RD1
K61Rokycany Obs. in the Czech Republic, 7 in MPECs 2018-R126 & 2018-R129 -- 2018 RQ2, 2018 RQ1, 2018 RO4, 2018 RM, 2018 RD1, 2018 QT, 2018 PK24
104San Marcello Pistoiese Obs. in Italy, 2 in MPECs 2018-R127 & 2018-R129 -- 2018 RO4, 2018 RM4
C95SATINO-1 in France, 1 in MPEC 2018-R126 -- 3552
033Schwarzschild Obs. in Germany, 6 in MPECs 2018-R127, 2018-R128, 2018-R129, 2018-R130, 2018-R131 & 2018-R132 -- 2018 RQ4, 2018 RP4, 2018 RO4, 2018 RN4, 2018 RM4, 2018 RK4
G40!M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-R126 -- 504800
G403Tony Evans in Portugal via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-R126 -- 2018 RQ2
587Sormano Obs. in Italy, 2 in MPEC 2018-R126 -- 2018 QW1, 2018 QU1
691Spacewatch 0.9m telescope in Arizona, 26 in MPEC 2018-R126 -- 2018 RX3, 2018 RQ1, 2018 RJ3, 2018 RH3, 2018 QV1, 2018 QT, 2018 QR, 2018 QP, 2018 PV10, 2018 PS7, 2018 PF8, 2018 PE22, 2018 MS6, 2018 LQ2, 2018 KV, 2018 GA, 2017 WC29, 2017 SN16, 2016 XD1, 2016 RY40, 2014 SK260, 2005 FG, 517829, 514652, 154330, 5653
291Spacewatch 1.8m telescope in Arizona, 7 in MPEC 2018-R126 -- 2018 RY1, 2018 QZ, 2018 QS, 2018 PB22, 2018 NO4, 2014 YB35, 2003 AY2
I52Steward Obs. Mt. Lemmon Station in Arizona, 19 in MPECs 2018-R126, 2018-R127, 2018-R128, 2018-R129, 2018-R130, 2018-R131, 2018-R132, 2018-R133 & 2018-R134 -- 2018 RY1, 2018 RU3, 2018 RR4, 2018 RQ4, 2018 RQ2, 2018 RP4, 2018 RO4, 2018 RN4, 2018 RM4, 2018 RM, 2018 RL4, 2018 RL, 2018 RK4, 2018 RJ3, 2018 RH3, 2018 RG3, 2018 RE3, 2018 RB2, 2018 RB
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2018-R126 -- 2018 RM, 2018 PY7
W63UTP Obs., 1 in MPEC 2018-R126 -- 3122
L01Visnjan Obs., 8 in MPECs 2018-R127, 2018-R128, 2018-R129, 2018-R130, 2018-R131, 2018-R132, 2018-R133 & 2018-R134 -- 2018 RR4, 2018 RQ4, 2018 RP4, 2018 RO4, 2018 RN4, 2018 RM4, 2018 RL4, 2018 RK4
718Wiggins Obs. in Utah, 2 in MPEC 2018-R126 -- 2018 RQ2, 144332
C51WISE in Earth polar orbit, 1 in MPEC 2018-R132 -- 2018 RK4
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 12 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 RQ4JPL Sentry17022063-2117532.05728961e-05-5.97-6.300JPL: Computed at 09:35 today Pacific time based on 20 observations spanning 1.0122 days (2018-Sep-11.2811 to 2018-Sep-12.29326). Diameter approximately 0.014 km. from weighted mean H=26.88.
2018 RT3NEODyS16302027-21171168.28e-07-4.03-4.370NEODyS: "Based on 23 optical observations (of which 0 are rejected as outliers) from 2018-09-09.314 to 2018-09-11.384."
2018 RJ3JPL Sentry16302070-207011.537e-06-7.26-7.260JPL: Computed at 08:31 today Pacific time based on 33 observations spanning 2.7960 days (2018-Sep-09.56735 to 2018-Sep-12.36336). Diameter approximately 0.010 km. from weighted mean H=27.75.
NEODyS16302057-2071108.42e-06-6.53-6.850NEODyS: "Based on 23 optical observations (of which 0 are rejected as outliers) from 2018-09-09.568 to 2018-09-10.628."
2018 RH3JPL Sentry16302097-211856.354672e-06-6.02-6.060JPL: Computed at 08:34 today Pacific time based on 48 observations spanning 2.7126 days (2018-Sep-09.43937 to 2018-Sep-12.15195). Diameter approximately 0.022 km. from weighted mean H=25.97.
2018 RB2JPL Sentry16302092-2118264.091829e-05-5.81-6.130JPL: Computed at 08:26 today Pacific time based on 45 observations spanning 4.9910 days (2018-Sep-07.26955 to 2018-Sep-12.26057). Diameter approximately 0.012 km. from weighted mean H=27.30.
NEODyS16302092-2118803.61e-05-5.89-6.29-NEODyS: "Based on 41 optical observations (of which 0 are rejected as outliers) from 2018-09-07.270 to 2018-09-11.182."
2018 RY1JPL Sentry16302040-2112262.868754e-07-6.15-6.530JPL: Computed at 08:48 today Pacific time based on 48 observations spanning 5.0443 days (2018-Sep-07.13874 to 2018-Sep-12.18306). Diameter approximately 0.045 km. from weighted mean H=24.40.
NEODyS16302030-2106202.24e-07-6.30-6.750NEODyS: "Based on 38 optical observations (of which 0 are rejected as outliers) from 2018-09-07.140 to 2018-09-11.205."
2018 RQ1NEODyS1630211411.67e-10-9.87-9.870NEODyS: "Based on 54 optical observations (of which 0 are rejected as outliers) from 2018-09-07.381 to 2018-09-11.390."
2018 QW1NEODyS1630204517.55e-10-7.58-7.580NEODyS: "Based on 47 optical observations (of which 0 are rejected as outliers) from 2018-08-31.251 to 2018-09-09.423."
2018 QSJPL Sentry16302084-211641.82677e-06-6.55-6.640JPL: Computed at 08:06 today Pacific time based on 67 observations spanning 24.849 days (2018-Aug-18.47984 to 2018-Sep-12.329). Diameter approximately 0.019 km. from weighted mean H=26.22.
NEODyS16302084-211631.71e-06-6.59-6.670NEODyS: "Based on 64 optical observations (of which 0 are rejected as outliers) from 2018-08-18.481 to 2018-09-06.495."
2018 PY7JPL Sentry1630R E M O V E DJPL: Risk listing removed at 1502 UTC today
NEODyS1630R E M O V E D-
2015 HE183JPL Sentry16302080-209033.6889e-07-8.04-8.390JPL: Computed at 07:47 today Pacific time based on 13 observations spanning 5.1522 days (2015-Apr-21.38391 to 2015-Apr-26.536079). Diameter approximately 0.008 km. from weighted mean H=28.18.
2014 EUJPL Sentry16302080-211751.94165e-06-7.42-7.730JPL: Computed at 07:40 today Pacific time based on 45 observations spanning 24.258 days (2014-Mar-05.05731 to 2014-Mar-29.315343). Diameter approximately 0.010 km. from weighted mean H=27.72.
2008 EM68JPL Sentry16302018-211611041.32242743e-05-5.18-5.470JPL: Computed at 00:27 April 7th of 2017 Pacific time based on 12 observations spanning .11019 days (2008-Mar-08.25164 to 2008-Mar-08.36183). Diameter approximately 0.010 km. from weighted mean H=27.72.

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 12 September '18

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

2114Generated Traffic Report
1806Grabbed MPEC 2018-R135 - 1998 UM1 = 2018 RP4 - see above
1702Noted that JPL Sentry has posted 2018 RQ4 as an impact risk - see above
1630Noted that JPL Sentry has updated its 2008 EM68 risk assessment - see above
Noted that JPL Sentry has updated its 2014 EU risk assessment - see above
Noted that JPL Sentry has updated its 2015 HE183 risk assessment - see above
Noted that JPL Sentry has removed 2018 PY7 as an impact risk - see above
Noted that NEODyS has removed 2018 PY7 as an impact risk - see above
Noted that JPL Sentry has updated its 2018 QS risk assessment - see above
Noted that NEODyS has updated its 2018 QS risk assessment - see above
Noted that NEODyS has posted 2018 QW1 as an impact risk - see above
Noted that JPL Sentry has updated its 2018 RB2 risk assessment - see above
Noted that NEODyS has updated its 2018 RB2 risk assessment - see above
Noted that JPL Sentry has updated its 2018 RH3 risk assessment - see above
Noted that JPL Sentry has updated its 2018 RJ3 risk assessment - see above
Noted that NEODyS has updated its 2018 RJ3 risk assessment - see above
Noted that NEODyS has updated its 2018 RQ1 risk assessment - see above
Noted that NEODyS has posted 2018 RT3 as an impact risk - see above
Noted that JPL Sentry has updated its 2018 RY1 risk assessment - see above
Noted that NEODyS has updated its 2018 RY1 risk assessment - see above
Grabbed MPEC 2018-R126 - Daily Orbit Update - see above
Grabbed MPEC 2018-R127 - 2018 RM4 - see above
Grabbed MPEC 2018-R128 - 2018 RN4 - see above
Grabbed MPEC 2018-R129 - 2018 RO4 - see above
Grabbed MPEC 2018-R130 - 2018 RP4 - see above
Grabbed MPEC 2018-R131 - 2018 RQ4 - see above
Grabbed MPEC 2018-R132 - 2018 RK4 - see above
Grabbed MPEC 2018-R133 - 2018 RL4 - see above
Grabbed MPEC 2018-R134 - 2018 RR4 - see above