Contents  on 13 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 13 September '18

Sixteen objects reported inside ten LD

Sixteen visitors are reported traveling less than ten lunar distances (LD) from our home world today. Within Earth's sphere of gravitational influence, 2018 RE3 is the nearest of these and comes its closest to the planet on this passage, reaching 1.84 LD at 1243 UTC, and getting its closest to the Moon -- 1.55 LD at 1710 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  9.36 to 11.20 LD Sept. 2 - 13 intruder, NHATS target, exits ten LD, risk
0.44 LD Sept. 8 2018 RW 3 m  6.39 to 7.72 LD Aug. 31 - Sept. 15 intruder, NHATS target, risk
0.58 LD Sept. 9 2018 RC 36 m  4.03 to 5.15 LD Aug. 31 - Sept. 18 intruder, NHATS target
0.94 LD Sept. 3 2018 RR1 4 m  9.13 to 10.14 LD Aug. 24 - today intruder, NHATS target, exits ten LD, risk
1.48 LD Sept. 15 2018 RE5 11 m  4.24 from 7.57 LD yesterday - Sept. 18 NEW, Moon buzzer, risk - MPEC
1.84 LD today 2018 RE3 13 m  1.84 LD Sept. 9 - 17 NHATS target, Earth closest at 1243 UTC,
Moon closest 1.55 LD at 1710 UTC - DOU
2.28 LD Sept. 9 2018 RD4 7 m  5.13 to 6.36 LD Sept. 2 - 16 NHATS target
2.40 LD Sept. 10 2018 RA1 18 m  5.13 to 7.20 LD Sept. 6 - 15
2.45 LD Sept. 11 2018 RB1 10 m  3.54 to 5.02 LD Sept. 6 - 16 NHATS target
3.22 LD yesterday 2018 RR4 13 m  3.35 to 4.34 LD Sept. 7 - 17
4.01 LD Sept. 10 2018 RF2 9 m  7.56 to 9.71 LD Sept. 6 - 14
4.06 LD Sept. 24 2018 RQ1 52 m  8.55 from 9.16 LD Sept. 11 - Oct. 8 NHATS target - DOU
4.39 LD yesterday 2018 RD5 23 m  4.57 to 5.17 LD Sept. 5 - 18 NEW - MPEC
4.49 LD Sept. 16 2018 RG5 14 m  6.84 from 8.34 LD Sept. 11 - 21 NEW - MPEC
7.80 LD Aug. 23 2018 PU23 8 m  9.92 to 10.09 LD Aug. 7 - today NHATS target, exits ten LD, risk
8.00 LD Sept. 16 2018 RA2 26 m  9.92 from 11.30 LD today - Sept. 19 NHATS target, enters ten LD - DOU

This report was generated at 1920 UTC with the discoveries of four objects: inbound objects 2018 RG5 (MPEC) and risk-listed 2018 RE5 (MPEC), outbound 2018 RD5 (MPEC), and already departed risk-listed 2018 RF5 (MPEC), which flew past us at 7.94 LD on September 8th. Today's DOU MPEC has follow-up for four objects in the active traffic tables here and for three departed objects: 2018 RY3 and risk-listed objects 2018 RH3 and 2018 QW1, plus observation from late 2015 of risk-listed 2015 XP that adds 24.93 days to its 2.93-day observation arc.

Approaching Traffic - sorted by 10-LD bubble entry date
9.74 LD Sept. 15 2018 RQ2 89 m  10.66 from 12.33 LD tomorrow - Sept. 16 DOU
8.50 LD Sept. 20 2017 SL16 23 m  13.00 from 14.10 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 13 September '18

The MPC's NEO Confirmation Page has 70 listings

When last checked at 1705 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 70 objects listed. Of these, 34 were "one nighters." So far The Tracking News has counted a total of 88 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 13 September '18

Minor Planet Electronic Circulars

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


MPEC 2018-R144 - "15:00 UT" - 2018 RH5


MPEC 2018-R143 - "14:40 UT" - 2018 RG5


MPEC 2018-R142 - "14:34 UT" - 2018 RF5


MPEC 2018-R141 - "14:29 UT" - 2018 RE5


MPEC 2018-R140 - "14:24 UT" - 2018 RC5


MPEC 2018-R139 - "14:19 UT" - 2018 RD5


MPEC 2018-R138 - "14:13 UT" - 2018 RB5


MPEC 2018-R137 - "14:07 UT" - 2018 RA5


<< DOU on 13 Sept. '18 >>  MPEC 2018-R136 - "12:06 UT" - Daily Orbit Update

Observers  on 13 September '18

A total of 37 observers appear in today's MPECs.

CodeObserver / observatory
C97Al-Fulaij Obs., 5 in MPEC 2018-R136 -- 2005 RB, 21277, 18109, 17511, 6456
H21Astronomical Research Obs. Westfield in Illinois, 28 in MPECs 2018-R136, 2018-R137, 2018-R138 & 2018-R140 -- 2018 RC5, 2018 RB5, 2018 RA5, 2018 QU, 2018 QQ1, 2018 PT10, 2018 PL8, 2018 PJ22, 2018 NN, 2018 ME7, 2018 KE3, 2016 XD1, 2016 RY40, 2016 HX3, 2015 DV180, 2015 BW92, 2012 MU2, 2009 ME9, 2008 OP8, 2000 YF29, 97725, 354127, 285990, 277958, 276468, 194386, 171486, 152895
T08ATLAS Mauna Loa in Hawaii, 3 in MPEC 2018-R136 -- 86324, 68950, 3752
160Castelmartini Obs. in Italy, 3 in MPEC 2018-R136 -- 2018 KE3, 518635, 438429
703Catalina Sky Survey (CSS) in Arizona, 43 in MPECs 2018-R136, 2018-R139 & 2018-R143 -- 2018 RQ1, 2018 RM, 2018 RG5, 2018 RD5, 2018 PJ9, 2018 KE3, 2015 AX16, 2014 SK260, 2012 UV27, 2011 UA, 2011 GA62, 2009 SX1, 2007 RX19, 2005 FG, 2005 CJ, 2004 QB17, 2002 PH80, 2001 SC170, 1999 VQ11, 65733, 481542, 481394, 457260, 438429, 418929, 414903, 366470, 337248, 333889, 163818, 162168, 155340, 153591, 153002, 137427, 13553, 12538, 105140, 9856, 8035, 6456, 5143, 3752
V06Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) in Arizona, 2 in MPECs 2018-R138 & 2018-R140 -- 2018 RC5, 2018 RB5
W84%program code "%" (14) via DECam in Chile, 1 in MPEC 2018-R136 -- 2015 XP
113Drebach Obs. in Germany, 1 in MPEC 2018-R139 -- 2018 RD5
151Eschenberg Obs. in Switzerland, 2 in MPEC 2018-R136 -- 31345, 6456
734Farpoint Obs. in Kansas, 3 in MPECs 2018-R137, 2018-R138 & 2018-R144 -- 2018 RH5, 2018 RB5, 2018 RA5
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2018-R139 -- 2018 RD5
K83Forti Obs., 4 in MPEC 2018-R136 -- 2015 FP118, 2011 UA, 17511, 17274
J95Great Shefford Obs. in England, 5 in MPECs 2018-R139, 2018-R141, 2018-R142, 2018-R143 & 2018-R144 -- 2018 RH5, 2018 RG5, 2018 RF5, 2018 RE5, 2018 RD5
H06#M. Suzuki in Japan via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2018-R139 -- 2018 RD5
W19Kalamazoo Obs. in Michigan, 3 in MPEC 2018-R136 -- 17274, 13553, 6456
585Kiev Comet Station in Ukraine, 1 in MPEC 2018-R139 -- 2018 RD5
246KLENOT in the Czech Republic, 3 in MPECs 2018-R136, 2018-R139 & 2018-R143 -- 2018 RG5, 2018 RD5, 2018 QW1
K38M57 Obs. in Italy, 1 in MPEC 2018-R136 -- 2015 FP118
474Mt. John Obs. in New Zealand, 2 in MPECs 2018-R138 & 2018-R140 -- 2018 RC5, 2018 RB5
G96Mt. Lemmon Survey (MLS) in Arizona, 42 in MPECs 2018-R136, 2018-R137, 2018-R138, 2018-R140, 2018-R141, 2018-R142 & 2018-R144 -- 2018 RW1, 2018 RV1, 2018 RU1, 2018 RM2, 2018 RH5, 2018 RH3, 2018 RF5, 2018 RE5, 2018 RC5, 2018 RB5, 2018 RA5, 2018 QP, 2018 PA20, 2018 NN, 2018 GA, 2017 YC8, 2015 RE36, 2014 RC11, 2014 PG51, 2013 RG21, 2008 CB22, 2007 RX19, 2005 CS6, 2004 QJ7, 2001 SC170, 423747, 418896, 409204, 333889, 31345, 264308, 250162, 226198, 17274, 162168, 144922, 138815, 138155, 137125, 13553, 5731, 1221
K74Muensterschwarzach Obs. in Germany, 1 in MPEC 2018-R139 -- 2018 RD5
J69North Obs. in England, 1 in MPEC 2018-R139 -- 2018 RD5
Z80Northolt Branch Obs. in England, 1 in MPEC 2018-R139 -- 2018 RD5
G34Oberfrauendorf Obs. in Germany, 2 in MPECs 2018-R136 & 2018-R139 -- 2018 RQ2, 2018 RD5
C23Olmen Obs. in Belgium, 1 in MPEC 2018-R136 -- 144332
I41Palomar Transient Factory (PTF) in southern California, 12 in MPECs 2018-R136 & 2018-R139 -- 2018 RQ2, 2018 RD5, 2018 PE22, 2016 JN, 2006 OT9, 2004 QB17, 457260, 422977, 413260, 253062, 18882, 115052
L04ROASTERR-1 in Romania, 4 in MPECs 2018-R136 & 2018-R139 -- 2018 RD5, 2018 QU1, 2018 KE3, 144332
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2018-R138 -- 2018 RB5
H36Sandlot Obs. in Kansas, 2 in MPECs 2018-R141 & 2018-R143 -- 2018 RG5, 2018 RE5
033Schwarzschild Obs. in Germany, 7 in MPECs 2018-R137, 2018-R138, 2018-R140, 2018-R141, 2018-R142, 2018-R143 & 2018-R144 -- 2018 RH5, 2018 RG5, 2018 RF5, 2018 RE5, 2018 RC5, 2018 RB5, 2018 RA5
691Spacewatch 0.9m telescope in Arizona, 6 in MPEC 2018-R136 -- 2018 PM22, 2018 PA20, 2018 FY1, 2018 FS3, 2010 GZ33, 2001 VC2
291Spacewatch 1.8m telescope in Arizona, 6 in MPEC 2018-R136 -- 2018 RY1, 2018 RQ4, 2018 PK21, 2018 PF9, 2018 NO1, 2018 MQ5
C36Starry Wanderer Obs. in Belarus, 1 in MPEC 2018-R136 -- 2015 FP118
I52Steward Obs. Mt. Lemmon Station in Arizona, 16 in MPECs 2018-R136, 2018-R137, 2018-R138, 2018-R139, 2018-R140, 2018-R141, 2018-R142, 2018-R143 & 2018-R144 -- 2018 RZ3, 2018 RY3, 2018 RH5, 2018 RH3, 2018 RG5, 2018 RF5, 2018 RE5, 2018 RE3, 2018 RD5, 2018 RD1, 2018 RC5, 2018 RC4, 2018 RB5, 2018 RA5, 2018 RA4, 2018 RA2
Z52The Studios Obs., 2 in MPEC 2018-R136 -- 13553, 6456
L01Visnjan Obs., 8 in MPECs 2018-R137, 2018-R138, 2018-R139, 2018-R140, 2018-R141, 2018-R142, 2018-R143 & 2018-R144 -- 2018 RH5, 2018 RG5, 2018 RF5, 2018 RE5, 2018 RD5, 2018 RC5, 2018 RB5, 2018 RA5
Z92West Park Obs. in England, 1 in MPEC 2018-R136 -- 144332
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 13 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 Sentry16002069-210335.9555e-06-6.64-6.980JPL: Computed at 08:53 today Pacific time based on 22 observations spanning 1.2291 days (2018-Sep-12.23986 to 2018-Sep-13.46895). Diameter approximately 0.012 km. from weighted mean H=27.32.
2018 RE5JPL Sentry16002104-210414.559e-10-10.60-10.60JPL: Computed at 08:52 today Pacific time based on 24 observations spanning 1.0365 days (2018-Sep-12.16553 to 2018-Sep-13.20205). Diameter approximately 0.011 km. from weighted mean H=27.39.
2018 RQ4JPL Sentry16002084-2117154.504447e-06-6.63-7.280JPL: Computed at 08:41 today Pacific time based on 23 observations spanning 2.1150 days (2018-Sep-11.2811 to 2018-Sep-13.39606). Diameter approximately 0.014 km. from weighted mean H=26.86.
2018 RH3JPL Sentry16002097-209711.579e-08-8.59-8.590JPL: Computed at 08:42 today Pacific time based on 56 observations spanning 3.7540 days (2018-Sep-09.43937 to 2018-Sep-13.19336). Diameter approximately 0.021 km. from weighted mean H=26.01.
2018 RY1JPL Sentry16352040-2112142.282265e-07-6.22-6.490JPL: Computed at 08:58 today Pacific time based on 50 observations spanning 6.1332 days (2018-Sep-07.13874 to 2018-Sep-13.27191). Diameter approximately 0.045 km. from weighted mean H=24.39.
2018 RQ1NEODyS1600R E M O V E D-
2018 QW1NEODyS1600R E M O V E D-
2015 XPJPL Sentry16002067-206715.521e-07-6.73-6.730JPL: Computed at 07:47 today Pacific time based on 68 observations spanning 27.858 days (2015-Nov-07.24826 to 2015-Dec-05.10672). Diameter approximately 0.024 km. from weighted mean H=25.76.
2008 EM68JPL Sentry16002019-211611011.32190001e-05-5.19-5.470JPL: 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 13 September '18

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

1920Generated Traffic Report
1635Noted that JPL Sentry has updated its 2018 RY1 risk assessment - see above
1600Noted that JPL Sentry has updated its 2008 EM68 risk assessment - see above
Noted that JPL Sentry has updated its 2015 XP risk assessment - see above
Noted that NEODyS has removed 2018 QW1 as an impact risk - see above
Noted that JPL Sentry has posted 2018 RE5 as an impact risk - see above
Noted that JPL Sentry has posted 2018 RF5 as an impact risk - see above
Noted that JPL Sentry has updated its 2018 RH3 risk assessment - see above
Noted that NEODyS has removed 2018 RQ1 as an impact risk - see above
Noted that JPL Sentry has updated its 2018 RQ4 risk assessment - see above
Grabbed MPEC 2018-R136 - Daily Orbit Update - see above
Grabbed MPEC 2018-R137 - 2018 RA5 - see above
Grabbed MPEC 2018-R138 - 2018 RB5 - see above
Grabbed MPEC 2018-R139 - 2018 RD5 - see above
Grabbed MPEC 2018-R140 - 2018 RC5 - see above
Grabbed MPEC 2018-R141 - 2018 RE5 - see above
Grabbed MPEC 2018-R142 - 2018 RF5 - see above
Grabbed MPEC 2018-R143 - 2018 RG5 - see above
Grabbed MPEC 2018-R144 - 2018 RH5 - see above