Contents  on 9 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 9 September '18

Twelve objects reported inside ten LD

There are twelve asteroidal objects reported within ten lunar distances (LD) of Earth today. Nearest of these is intruder 2018 RC, which travels all day inside the Earth-Moon system, coming in from 0.83 LD, passing us at 0.58 LD at 1208 UTC, and moving out to 0.82 LD. Another intruder, risk-listed 2018 RW, leaves Earth's sphere of gravitational influence, sliding off from 1.15 to 2.43 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
0.44 LD yesterday 2018 RW 3 m  1.15 to 2.43 LD Aug. 31 - Sept. 15 intruder, NHATS target, exits Earth SOI, risk - DOU
0.58 LD today 2018 RC 36 m  0.58 LD Aug. 31 - Sept. 18 intruder today, NHATS target, Earth closest at 1208 UTC - DOU
0.94 LD Sept. 3 2018 RR1 4 m  5.16 to 6.15 LD Aug. 24 - Sept. 13 NEW, intruder, NHATS target, risk - MPEC, DOU
0.99 LD Sept. 6 2018 RE2 7 m  5.11 to 7.03 LD Sept. 1 - 11 NEW, intruder - MPEC, DOU
1.47 LD Sept. 5 2018 RB2 12 m  7.07 to 9.10 LD Aug. 31 - tomorrow NEW, risk - MPEC, DOU
1.99 LD Sept. 6 2018 RR 10 m  5.45 to 7.35 LD Sept. 1 - 11 NHATS target - DOU
2.40 LD tomorrow 2018 RA1 18 m  3.28 from 5.10 LD Sept. 6 - 15 DOU
2.45 LD Sept. 11 2018 RB1 10 m  3.80 from 5.33 LD Sept. 6 - 16 NHATS target - DOU
4.01 LD tomorrow 2018 RF2 9 m  4.12 from 5.23 LD Sept. 6 - 14 NEW - MPEC, DOU
5.76 LD Sept. 4 2018 RD2 15 m  9.61 to 11.18 LD Aug. 31 - today NEW, NHATS target, exits ten LD - MPEC
5.83 LD Sept. 5 2018 RO 22 m  7.87 to 8.90 LD Aug. 30 - tomorrow
7.80 LD Aug. 23 2018 PU23 8 m  9.29 to 9.44 LD Aug. 7 - Sept. 13 NHATS target, risk

This report was updated at 2318 UTC with the discovery of approaching 2018 RQ2 (MPEC). Your first neighboring asteroids traffic report was generated at 2114 UTC with three discoveries announced today: intruder 2018 RE2 (MPEC, DOU), which flew by us at 0.99 LD on September 6th, inbound 2018 RF2 (MPEC, DOU), and outbound 2018 RD2 (MPEC). We also note six discoveries announced late yesterday: approaching objects 2018 RA2 (MPEC) and 2018 RQ1 (MPEC), risk-listed outbound objects 2018 RB2 (MPEC, DOU) and intruder 2018 RR1 (MPEC, DOU), which went by at 0.94 LD on September 3rd, and already departed objects 2018 RO1 (MPEC, DOU), which went by us at 4.23 LD on September 4th, and 2018 RN1 (MPEC), which passed at 8.99 LD on August 30th. Today's DOU MPEC has follow-up for five of those discoveries plus eleven other objects: inbound 2018 RB1 and 2018 RA1, risk-listed intruders passing 2018 RC and outbound 2018 RW, outbound 2018 RR, and departed 2018 RZ, 2018 RP (risk listed), 2018 RE, 2018 RA, 2018 QX, and 2018 LQ2.

Approaching Traffic - sorted by 10-LD bubble entry date
4.1   LD Sept. 24* 2018 RQ1 50 m  11.1 from 11.7 LD Sept. 11 - Oct. 8 NEW, EPU +/- 1.92 hours*, NHATS target, risk - MPEC
8.0   LD Sept. 16* 2018 RA2 26 m  16.4 from 18.3 LD Sept. 13 - 19 NEW, EPU +/- 6 mins.*, NHATS target - MPEC
9.76 LD Sept. 15 2018 RQ2 91 m  19.87 from 22.75 LD Sept. 14 - 16 NEW - MPEC
8.50 LD Sept. 20 2017 SL16 23 m  17.67 from 18.92 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. 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 9 September '18

The MPC's NEO Confirmation Page has 40 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 40 objects listed. Of these, 20 were "one nighters." So far The Tracking News has counted a total of 58 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 9 September '18

Minor Planet Electronic Circulars

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


MPEC 2018-R93 - "21:01 UT" - 2018 RR2


MPEC 2018-R92 - "20:57 UT" - 2018 RQ2


MPEC 2018-R91 - "20:53 UT" - 2018 RP2


MPEC 2018-R90 - "20:49 UT" - 2018 RO2


MPEC 2018-R89 - "20:45 UT" - 2018 RN2


MPEC 2018-R88 - "20:41 UT" - 2018 RM2


MPEC 2018-R87 - "20:37 UT" - 2018 RL2


<< DOU on 9 Sept. '18 >>  MPEC 2018-R86 - "12:04 UT" - Daily Orbit Update


MPEC 2018-R85 - "11:51 UT" - 2017 XD


MPEC 2018-R84 - "11:44 UT" - 2017 BO3


MPEC 2018-R83 - "11:41 UT" - 2016 YE3


MPEC 2018-R82 - "01:08 UT" - 2016 TS55


MPEC 2018-R81 - "01:06 UT" - 2016 RX17


MPEC 2018-R80 - "01:04 UT" - 2001 SR263


MPEC 2018-R79 - "00:13 UT" - 2018 RD2


MPEC 2018-R78 - "00:06 UT" - 2018 RF2


MPEC 2018-R77 - "00:02 UT" - 2018 RE2

Observers  on 9 September '18

A total of 47 observers appear in today's MPECs.

CodeObserver / observatory
C97Al-Fulaij Obs., 5 in MPEC 2018-R86 -- 2018 KE3, 438429, 17274, 13553, 1627
H21Astronomical Research Obs. Westfield in Illinois, 12 in MPECs 2018-R83 & 2018-R86 -- 2018 QU1, 2018 QT1, 2018 QP, 2018 PX7, 2018 PS23, 2018 PJ9, 2018 PA20, 2018 NN, 2018 LQ2, 2018 JS1, 2018 FO5, 2016 YE3
T05ATLAS Haleakala in Hawaii, 21 in MPECs 2018-R86 & 2018-R92 -- 2018 RQ2, 2015 RB82, 2010 RO82, 2005 WF57, 2001 RQ17, 1999 RV2, 68359, 54789, 517829, 517681, 467917, 445267, 443923, 439313, 358744, 190788, 163373, 7889, 4954, 4596, 4401
T08ATLAS Mauna Loa in Hawaii, 22 in MPEC 2018-R86 -- 2018 QU1, 2018 QT, 2018 PJ22, 2018 LQ2, 2012 UV27, 2011 UA, 2011 GA62, 2002 PH80, 2001 SC170, 2001 QA143, 68950, 481394, 457260, 438429, 418929, 369986, 337248, 283729, 115052, 5143, 3691, 1865
073Bucharest Obs. in Romania, 1 in MPEC 2018-R86 -- 2018 RC
160Castelmartini Obs. in Italy, 5 in MPECs 2018-R86 & 2018-R92 -- 2018 RQ2, 2018 RD1, 2018 KE3, 86324, 518635
703Catalina Sky Survey (CSS) in Arizona, 14 in MPEC 2018-R86 -- 2018 PK24, 2018 PJ22, 2018 LQ2, 1999 RB32, 96315, 66008, 454177, 413563, 413260, 16834, 144332, 115052, 3691, 433
V06Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) in Arizona, 4 in MPECs 2018-R83 & 2018-R86 -- 2018 QU, 2018 PF9, 2016 YE3, 2015 BP510
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 19 in MPECs 2018-R83, 2018-R84, 2018-R85 & 2018-R86 -- 2018 QX, 2018 QF1, 2018 QA1, 2018 PX21, 2018 PM21, 2018 PG8, 2018 PF9, 2018 NM4, 2018 LJ1, 2017 XD, 2017 BO3, 2016 YE3, 2016 RY40, 2013 TW135, 2012 VE37, 2011 QX8, 2009 UX19, 2008 TY3, 2004 VB
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 6 in MPECs 2018-R77, 2018-R80, 2018-R81, 2018-R82, 2018-R86 & 2018-R92 -- 2018 RQ2, 2018 RE2, 2016 TS55, 2016 RX17, 2008 UV91, 2001 SR263
151Eschenberg Obs. in Switzerland, 6 in MPECs 2018-R78, 2018-R86 & 2018-R92 -- 2018 RQ2, 2018 RF2, 2018 RB, 2018 QT, 2018 PK24, 2015 FP118
595Farra d'Isonzo Obs. in Italy, 4 in MPECs 2018-R86, 2018-R89 & 2018-R92 -- 2018 RQ2, 2018 RN2, 2018 RC, 2018 RB2
X31Galilei Obs., 1 in MPEC 2018-R86 -- 2018 RC
J95Great Shefford Obs. in England, 2 in MPECs 2018-R79 & 2018-R86 -- 2018 RW, 2018 RD2
238Grorudalen Obs. in Norway, 1 in MPEC 2018-R86 -- 2015 FP118
A17Guidestar Obs. in Germany, 1 in MPEC 2018-R92 -- 2018 RQ2
W85LCO Cerro Tololo A in Chile, 1 in MPEC 2018-R86 -- 2018 RC
699LONEOS in Arizona, 1 in MPEC 2018-R85 -- 2017 XD
K30Luscherz Obs. in Switzerland, 1 in MPEC 2018-R92 -- 2018 RQ2
K38M57 Obs. in Italy, 1 in MPEC 2018-R92 -- 2018 RQ2
108Montelupo Obs. in Italy, 1 in MPEC 2018-R92 -- 2018 RQ2
474Mt. John Obs. in New Zealand, 13 in MPECs 2018-R78, 2018-R86, 2018-R88, 2018-R89, 2018-R90 & 2018-R91 -- 2018 RP2, 2018 RO2, 2018 RN2, 2018 RM2, 2018 RF2, 2018 RE, 2018 RD1, 2018 RC, 2018 RB1, 2018 RA1, 2018 PH22, 2018 LF5, 2018 JA
G96Mt. Lemmon Survey (MLS) in Arizona, 32 in MPECs 2018-R78, 2018-R79, 2018-R80, 2018-R86, 2018-R88, 2018-R89, 2018-R90 & 2018-R91 -- 2018 RP2, 2018 RO2, 2018 RN2, 2018 RM2, 2018 RF2, 2018 RD2, 2018 QU1, 2018 PJ22, 2018 KF3, 2011 EJ47, 2010 VB72, 2001 SR263, 1999 RB32, 67399, 53426, 514652, 37336, 283729, 20826, 18736, 171819, 170891, 16816, 163818, 162215, 159495, 155340, 155110, 138846, 3691, 1943, 1865
K74Muensterschwarzach Obs. in Germany, 1 in MPEC 2018-R92 -- 2018 RQ2
C47Nonndorf Obs. in Austria, 2 in MPECs 2018-R86 & 2018-R92 -- 2018 RQ2, 2018 PK24
Z80Northolt Branch Obs. in England, 1 in MPEC 2018-R86 -- 2018 RC
I41Palomar Transient Factory (PTF) in southern California, 6 in MPECs 2018-R77, 2018-R86 & 2018-R87 -- 2018 RL2, 2018 RE2, 2018 NN4, 2003 RM, 333889, 138847
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2018-R93 -- 2018 RR2
K63Pascoli Obs. in Italy, 5 in MPECs 2018-R77, 2018-R79, 2018-R86, 2018-R87 & 2018-R92 -- 2018 RQ2, 2018 RL2, 2018 RF2, 2018 RE2, 2018 RD2
A53Peschiera del Garda Obs. in Italy, 1 in MPEC 2018-R86 -- 2018 RC
122Pises Obs. in France, 1 in MPEC 2018-R86 -- 418929
D29Purple Mtn. Obs. Xuyi Station in China, 32 in MPECs 2018-R86 & 2018-R93 -- 2018 RR2, 2018 LQ2, 2018 FS3, 2017 YC8, 2015 AX16, 2013 EP41, 2012 RF15, 2007 RX19, 2002 EC3, 87311, 516976, 508871, 438429, 418929, 376788, 369454, 366470, 31345, 253841, 243566, 21277, 18109, 17511, 17274, 162168, 155334, 138155, 137044, 11500, 9856, 4183, 3288
B04Saint-Barthelemy Obs. in Italy, 1 in MPEC 2018-R86 -- 2018 RS1
104San Marcello Pistoiese Obs. in Italy, 4 in MPECs 2018-R78, 2018-R79, 2018-R86 & 2018-R92 -- 2018 RX1, 2018 RQ2, 2018 RF2, 2018 RD2
C95SATINO-1 in France, 1 in MPEC 2018-R86 -- 2018 RA
204Schiaparelli Obs. in Italy, 10 in MPECs 2018-R86, 2018-R89 & 2018-R92 -- 2018 RZ1, 2018 RY1, 2018 RQ2, 2018 RN2, 2018 RE2, 2018 RB1, 2018 PS7, 2018 PH9, 2018 MS6, 2007 RZ8
G40"G. Gasparovic in Croatia via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-R86 -- 18109
G409B. Lutkenhoner in Germany via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-R92 -- 2018 RQ2
Y00SONEAR in Brazil, 1 in MPEC 2018-R86 -- 2018 RC
587Sormano Obs. in Italy, 1 in MPEC 2018-R86 -- 2018 RC
691Spacewatch 0.9m telescope in Arizona, 5 in MPEC 2018-R86 -- 2018 OB1, 2012 SN30, 2012 DG61, 2011 EJ47, 65733
291Spacewatch 1.8m telescope in Arizona, 6 in MPEC 2018-R86 -- 2018 RY1, 2018 RR1, 2018 PR23, 2018 PG21, 2016 SG1, 2016 SA
W34Squirrel Valley Obs. in North Carolina, 2 in MPECs 2018-R86 & 2018-R92 -- 2018 RQ2, 65996
I52Steward Obs. Mt. Lemmon Station in Arizona, 28 in MPECs 2018-R77, 2018-R78, 2018-R79, 2018-R80, 2018-R86, 2018-R87, 2018-R88, 2018-R89, 2018-R90, 2018-R91, 2018-R92 & 2018-R93 -- 2018 RZ, 2018 RY, 2018 RX, 2018 RR2, 2018 RR, 2018 RQ2, 2018 RP2, 2018 RO2, 2018 RN2, 2018 RM2, 2018 RL2, 2018 RF2, 2018 RE2, 2018 RE, 2018 RD2, 2018 RD1, 2018 RC1, 2018 RB1, 2018 RB, 2018 RA1, 2018 QV1, 2018 QE1, 2018 PW23, 2018 PK24, 2016 TZ56, 2014 SK260, 2012 RF15, 2001 SR263
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 3 in MPEC 2018-R86 -- 2018 RY1, 2018 RP, 2018 RC
L01Visnjan Obs., 8 in MPECs 2018-R78, 2018-R79, 2018-R86, 2018-R87, 2018-R89, 2018-R91 & 2018-R92 -- 2018 RV1, 2018 RQ2, 2018 RP2, 2018 RO1, 2018 RN2, 2018 RL2, 2018 RF2, 2018 RD2
718Wiggins Obs. in Utah, 1 in MPEC 2018-R86 -- 144332
C51WISE in Earth polar orbit, 4 in MPEC 2018-R86 -- 445305, 329390, 3552, 719
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 9 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 RB2JPL Sentry17112092-2118302.9706113e-05-5.93-6.340JPL #2 for the day: Computed at 08:25 today Pacific time based on 29 observations spanning 1.7476 days (2018-Sep-07.26955 to 2018-Sep-09.01716). Diameter approximately 0.012 km. from weighted mean H=27.25.
2018 RY1JPL Sentry17112030-2112523.12931e-07-6.07-6.580JPL #2 for the day: Computed at 08:57 today Pacific time based on 28 observations spanning 2.1766 days (2018-Sep-07.13874 to 2018-Sep-09.315347). Diameter approximately 0.049 km. from weighted mean H=24.22.
2018 RR1JPL Sentry17112083-2116122.1013882e-05-7.43-7.760JPL: Computed at 08:33 today Pacific time based on 16 observations spanning 1.9127 days (2018-Sep-07.39342 to 2018-Sep-09.3061). Diameter approximately 0.004 km. from weighted mean H=29.83.
NEODyS17112066-2118501.62e-05-7.61-7.89n/aNEODyS: "Based on 14 optical observations (of which 1 are rejected as outliers) from 2018-09-07.394 to 2018-09-08.535."
2018 RQ1NEODyS17112103-211225.01e-08-7.38-7.380NEODyS: "Based on 22 optical observations (of which 0 are rejected as outliers) from 2018-09-07.381 to 2018-09-08.695."
2018 RWJPL Sentry17112110-211015.372e-09-11.20-11.20JPL: Computed at 08:24 today Pacific time based on 48 observations spanning .66094 days (2018-Sep-07.34117 to 2018-Sep-08.00211). Diameter approximately 0.003 km. from weighted mean H=30.27.
2018 RPJPL Sentry1711R E M O V E DJPL: Risk listing removed at 1507 UTC today
2018 RCNEODyS1711R E M O V E D-
2018 QSNEODyS17112084-211628.49e-07-6.92-7.080NEODyS: "Based on 61 optical observations (of which 0 are rejected as outliers) from 2018-08-18.481 to 2018-09-06.495."
2018 PZ21NEODyS17112045-2117341.36e-05-5.90-6.150NEODyS: "Based on 18 optical observations (of which 0 are rejected as outliers) from 2018-08-12.369 to 2018-09-05.346."

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 9 September '18

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

2318Updated Traffic Report
2109Grabbed MPEC 2018-R87 - 2018 RL2 - see above
Grabbed MPEC 2018-R88 - 2018 RM2 - see above
Grabbed MPEC 2018-R89 - 2018 RN2 - see above
Grabbed MPEC 2018-R90 - 2018 RO2 - see above
Grabbed MPEC 2018-R91 - 2018 RP2 - see above
Grabbed MPEC 2018-R92 - 2018 RQ2 - see above
Grabbed MPEC 2018-R93 - 2018 RR2 - see above
1711Noted that NEODyS has updated its 2018 PZ21 risk assessment - see above
Noted that NEODyS has updated its 2018 QS risk assessment - see above
Noted that JPL Sentry has updated its 2018 RB2 risk assessment - see above
Noted that NEODyS has removed 2018 RC as an impact risk - see above
Noted that JPL Sentry has removed 2018 RP as an impact risk - see above
Noted that NEODyS has posted 2018 RQ1 as an impact risk - see above
Noted that JPL Sentry has updated its 2018 RR1 risk assessment - see above
Noted that NEODyS has posted 2018 RR1 as an impact risk - see above
Noted that JPL Sentry has posted 2018 RW as an impact risk - see above
Noted that JPL Sentry has updated its 2018 RY1 risk assessment - see above
Grabbed MPEC 2018-R83 - 2016 YE3 - see above
Grabbed MPEC 2018-R84 - 2017 BO3 - see above
Grabbed MPEC 2018-R85 - 2017 XD - see above
Grabbed MPEC 2018-R86 - Daily Orbit Update - see above
0310Noted that JPL Sentry has posted 2018 RY1 as an impact risk - see above
Grabbed MPEC 2018-R82 - 2016 TS55 - see above
0108Noted that JPL Sentry has posted 2018 RB2 as an impact risk - see above
Grabbed MPEC 2018-R80 - 2001 SR263 - see above
Grabbed MPEC 2018-R81 - 2016 RX17 - see above
0021Grabbed MPEC 2018-R77 - 2018 RE2 - see above
Grabbed MPEC 2018-R78 - 2018 RF2 - see above
Grabbed MPEC 2018-R79 - 2018 RD2 - see above