Contents  on 7 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 7 September '18

Seven objects reported inside ten LD

Seven neighboring small objects are reported inside ten lunar distances (LD) of our home world today. Closest is inbound risk-listed intruder 2018 RC, which enters Earth's sphere of gravitational influence (SOI), slipping in from 2.93 to 1.83 LD, while newly announced 2018 RR leaves the SOI, moving out from 2.25 to 3.65 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
0.28 LD Sept. 5 2018 RS 4 m  4.86 to 8.64 LD Sept. 3 - 8 NEW, intruder - MPEC
0.58 LD Sept. 9 2018 RC 40 m  1.83 from 2.93 LD Aug. 31 - Sept. 18 intruder, radar/NHATS target, enters Earth SOI, risk - DOU
1.99 LD yesterday 2018 RR 10 m  2.25 to 3.65 LD Sept. 1 - 11 NEW, NHATS target, exits Earth SOI - MPEC, DOU
3.03 LD Sept. 1 2018 RA 15 m  9.18 to 10.64 LD Aug. 26 - today exits ten LD
3.76 LD Sept. 5 2018 RP 20 m  6.14 to 8.87 LD Sept. 2 - 8 NEW, risk - MPEC
5.83 LD Sept. 5 2018 RO 22 m  6.31 to 6.99 LD Aug. 30 - Sept. 10 NEW - MPEC, DOU
7.80 LD Aug. 23 2018 PU23 8 m  8.99 to 9.14 LD Aug. 7 - Sept. 13 NHATS target, risk
Approaching Traffic
8.50 LD Sept. 20 2017 SL16 23 m  20.18 from 21.47 LD Sept. 17 - 24 NHATS target

This report was generated at 1850 UTC with the discoveries of four objects, all currently outbound within ten LD: Intruder 2018 RS (MPEC), which flew by us at 0.28 LD (and the Moon at 0.85 LD) on September 5th, 2018 RR (MPEC, DOU), 2018 RP (MPEC), and 2018 RO (MPEC, DOU). Today's DOU MPEC has follow-up for inbound intruder 2018 RC, which was also reported yesterday observed by radar, and follow-up for five departed objects 2018 RE, 2018 LQ2, 1998 SD9, and risk-listed 2018 PZ21 and 2018 MC7.



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 7 September '18

The MPC's NEO Confirmation Page has 59 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 59 objects listed. Of these, 29 were "one nighters." So far The Tracking News has counted a total of 75 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 7 September '18

Minor Planet Electronic Circulars

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


<< DOU on 7 Sept. '18 >>  MPEC 2018-R39 - "12:05 UT" - Daily Orbit Update


MPEC 2018-R38 - "10:35 UT" - 2017 SN16


MPEC 2018-R37 - "10:33 UT" - 2016 EN1


MPEC 2018-R36 - "10:32 UT" - 2015 OJ22


MPEC 2018-R35 - "03:13 UT" - 2018 RS


MPEC 2018-R34 - "03:10 UT" - 2018 RR


MPEC 2018-R33 - "02:48 UT" - 2018 RP


MPEC 2018-R32 - "02:45 UT" - 2018 RO


MPEC 2018-R31 - "02:42 UT" - 2018 RQ


MPEC 2018-R30 - "02:39 UT" - 2018 RN


MPEC 2018-R29 - "02:36 UT" - 2018 RM


MPEC 2018-R28 - "02:31 UT" - 2018 RL


MPEC 2018-R27 - "02:10 UT" - 2006 QM33


MPEC 2018-R26 - "00:40 UT" - 2017 SN14


MPEC 2018-R25 - "00:38 UT" - 2016 RH18


MPEC 2018-R24 - "00:36 UT" - 2005 FG

Observers  on 7 September '18

A total of 38 observers appear in today's MPECs.

CodeObserver / observatory
C97Al-Fulaij Obs., 7 in MPEC 2018-R39 -- 2018 KE3, 2013 EP41, 438429, 144332, 13553, 105140, 1627
E23Arcadia Obs. in New South Wales, 1 in MPEC 2018-R27 -- 2006 QM33
H21Astronomical Research Obs. Westfield in Illinois, 6 in MPECs 2018-R27, 2018-R29 & 2018-R39 -- 2018 RM, 2018 RB, 2018 PK10, 2018 NR, 2018 KE3, 2006 QM33
T05ATLAS Haleakala in Hawaii, 35 in MPEC 2018-R39 -- 2018 QU1, 2018 PS7, 2018 PK24, 2018 PJ22, 2018 LQ2, 2018 KE3, 2012 UV27, 2011 UA, 2011 GA62, 2009 SX1, 2005 RB, 2004 QB17, 2002 OS4, 2001 SC170, 2001 QA143, 1999 RB32, 86324, 68950, 65733, 481394, 457260, 438429, 418929, 369986, 337248, 333889, 283729, 163818, 138847, 105140, 8035, 5143, 3752, 3691, 1865
T08ATLAS Mauna Loa in Hawaii, 23 in MPEC 2018-R39 -- 2018 GA5, 2015 RB82, 2012 NP, 2010 RO82, 2005 WF57, 2005 UY5, 2001 RQ17, 1999 RV2, 54789, 517829, 517681, 467917, 445267, 443923, 439313, 410088, 358744, 190788, 163373, 7889, 5646, 4401, 1916
160Castelmartini Obs. in Italy, 12 in MPEC 2018-R39 -- 2018 QU1, 2015 RJ83, 2013 EP41, 2007 RX19, 2005 RB, 2001 SC170, 481394, 418929, 337248, 267729, 163818, 115052
703Catalina Sky Survey (CSS) in Arizona, 47 in MPECs 2018-R24, 2018-R27, 2018-R29, 2018-R30 & 2018-R39 -- 2018 RN, 2018 RM, 2018 QU1, 2018 QT, 2018 PX7, 2018 PK24, 2018 LZ5, 2018 LQ2, 2018 KE3, 2015 AX16, 2014 PG51, 2012 UV27, 2012 OD1, 2011 UA, 2009 SX1, 2006 QM33, 2005 RB, 2005 FG, 2005 CJ, 2004 QB17, 2003 RM, 2001 SC170, 2001 QA143, 1999 VQ11, 1999 RB32, 69230, 516976, 481542, 457260, 418929, 413260, 382459, 333889, 250162, 20826, 163818, 162215, 162168, 155334, 153591, 139622, 13553, 9856, 6456, 5143, 3691, 1865
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 11 in MPECs 2018-R25, 2018-R36 & 2018-R39 -- 2018 PW21, 2018 PO9, 2018 PB9, 2018 NB4, 2018 GT1, 2018 GR2, 2018 GC, 2018 FF2, 2018 BH6, 2016 RH18, 2015 OJ22
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 3 in MPECs 2018-R32, 2018-R35 & 2018-R39 -- 2018 RS, 2018 RO, 2018 RC
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2018-R28 -- 2018 RL
J95Great Shefford Obs. in England, 6 in MPECs 2018-R29, 2018-R30, 2018-R31, 2018-R32, 2018-R33 & 2018-R34 -- 2018 RR, 2018 RQ, 2018 RP, 2018 RO, 2018 RN, 2018 RM
A17Guidestar Obs. in Germany, 1 in MPEC 2018-R29 -- 2018 RM
W19Kalamazoo Obs. in Michigan, 1 in MPEC 2018-R39 -- 2015 FP118
W87LCO Cerro Tololo C in Chile, 1 in MPEC 2018-R39 -- 2018 RC
K38M57 Obs. in Italy, 1 in MPEC 2018-R29 -- 2018 RM
932McCarthy Obs. in Connecticut, 1 in MPEC 2018-R31 -- 2018 RQ
711McDonald Obs. in Texas, 1 in MPEC 2018-R29 -- 2018 RM
108Montelupo Obs. in Italy, 2 in MPEC 2018-R39 -- 2018 RC, 2013 EP41
474Mt. John Obs. in New Zealand, 6 in MPECs 2018-R27, 2018-R29, 2018-R30, 2018-R38 & 2018-R39 -- 2018 RN, 2018 RM, 2018 PB22, 2017 SN16, 2016 AM131, 2006 QM33
G96Mt. Lemmon Survey (MLS) in Arizona, 26 in MPECs 2018-R35 & 2018-R39 -- 2018 RS, 2018 RC, 2018 RB, 2018 QP, 2018 PA20, 2018 MS6, 2018 KE3, 2018 FS3, 2014 PG51, 2005 RB, 2003 RC2, 2001 SC170, 508871, 490636, 438429, 418896, 31345, 288914, 264308, 162168, 141851, 140039, 138155, 13553, 11500, 5731
Z80Northolt Branch Obs. in England, 3 in MPECs 2018-R34 & 2018-R39 -- 2018 RR, 2018 RQ, 2018 RC
I41Palomar Transient Factory (PTF) in southern California, 10 in MPECs 2018-R28, 2018-R31, 2018-R32, 2018-R33, 2018-R34 & 2018-R39 -- 2018 RR, 2018 RQ, 2018 RP, 2018 RO, 2018 RL, 2018 MM8, 2016 RO1, 457260, 337248, 115052
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPECs 2018-R24 & 2018-R39 -- 2018 BH6, 2005 FG
K63Pascoli Obs. in Italy, 3 in MPECs 2018-R29, 2018-R34 & 2018-R39 -- 2018 RR, 2018 RM, 2018 RC
K61Rokycany Obs. in the Czech Republic, 1 in MPEC 2018-R29 -- 2018 RM
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2018-R29 -- 2018 RM
C95SATINO-1 in France, 1 in MPEC 2018-R39 -- 2018 PL9
204Schiaparelli Obs. in Italy, 9 in MPECs 2018-R26, 2018-R27, 2018-R28, 2018-R29, 2018-R30 & 2018-R39 -- 2018 RN, 2018 RM, 2018 RL, 2018 QT1, 2018 QT, 2018 QP, 2018 PX7, 2017 SN14, 2006 QM33
Y00SONEAR in Brazil, 1 in MPEC 2018-R39 -- 2011 UA
587Sormano Obs. in Italy, 3 in MPECs 2018-R27, 2018-R29 & 2018-R39 -- 2018 RM, 2006 QM33, 1998 SD9
691Spacewatch 0.9m telescope in Arizona, 9 in MPECs 2018-R37 & 2018-R39 -- 2018 QQ, 2018 PK21, 2018 GA, 2018 FS3, 2016 EN1, 2010 SH13, 2009 UX17, 2003 ED50, 2001 PU9
291Spacewatch 1.8m telescope in Arizona, 6 in MPEC 2018-R39 -- 2018 PF8, 2018 LU3, 2018 JW1, 2014 XR6, 2014 CS, 2010 SH13
I52Steward Obs. Mt. Lemmon Station in Arizona, 24 in MPECs 2018-R24, 2018-R27, 2018-R28, 2018-R29, 2018-R30, 2018-R31, 2018-R35, 2018-R37, 2018-R38 & 2018-R39 -- 2018 RS, 2018 RQ, 2018 RO, 2018 RN, 2018 RM, 2018 RL, 2018 RE, 2018 RB, 2018 QY, 2018 QV1, 2018 QU1, 2018 QT1, 2018 QE1, 2018 PS7, 2018 PK22, 2018 PJ9, 2018 PH9, 2018 PA20, 2018 LQ15, 2018 KG1, 2017 SN16, 2016 EN1, 2006 QM33, 2005 FG
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 3 in MPEC 2018-R39 -- 2018 PZ21, 2018 MC7, 2014 CS
L01Visnjan Obs., 8 in MPECs 2018-R27, 2018-R28, 2018-R29, 2018-R30, 2018-R31, 2018-R33 & 2018-R39 -- 2018 RR, 2018 RQ, 2018 RP, 2018 RN, 2018 RM, 2018 RL, 2006 QM33, 2005 FG
Z92West Park Obs. in England, 1 in MPEC 2018-R39 -- 2015 FP118
718Wiggins Obs. in Utah, 3 in MPEC 2018-R39 -- 2018 RC, 2018 LQ2, 144332
C51WISE in Earth polar orbit, 1 in MPEC 2018-R39 -- 518463
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 7 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 RPNEODyS1500208315.92e-07-6.82-6.820NEODyS: "Based on 26 optical observations (of which 0 are rejected as outliers) from 2018-09-05.367 to 2018-09-06.993."
JPL Sentry04302083-208318.967e-08-7.63-7.630JPL: Computed at 21:10 Sept. 6th Pacific time based on 26 observations spanning 1.6255 days (2018-Sep-05.36637 to 2018-Sep-06.99186). Diameter approximately 0.020 km. from weighted mean H=26.14.
2018 RCNEODyS1500210211.57e-08-8.07-8.070NEODyS: "Based on 72 optical observations (of which 0 are rejected as outliers) from 2018-09-03.586 to 2018-09-06.048."
2018 PZ21JPL Sentry15422045-2108173.2236943e-05-5.45-5.500JPL: Computed at 08:07 today Pacific time based on 18 observations spanning 23.977 days (2018-Aug-12.36837 to 2018-Sep-05.345076). Diameter approximately 0.016 km. from weighted mean H=26.67.
2018 NLNEODyS15002060-2114291.67e-04-4.03-4.070NEODyS: "Based on 34 optical observations (of which 0 are rejected as outliers) from 2018-07-03.404 to 2018-09-05.557."
2018 MC7JPL Sentry1500R E M O V E DJPL: Risk listing removed at 1450 UTC today
2014 JU79NEODyS15002022-2100174.81e-09-7.28-7.880NEODyS: "Based on 7 optical observations (of which 0 are rejected as outliers) from 2014-05-05.175 to 2014-05-06.381."

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 7 September '18

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

1850Generated Traffic Report
1542Noted that JPL Sentry has updated its 2018 PZ21 risk assessment - see above
1500Noted that NEODyS has updated its 2014 JU79 risk assessment - see above
Noted that JPL Sentry has removed 2018 MC7 as an impact risk - see above
Noted that NEODyS has updated its 2018 NL risk assessment - see above
Noted that NEODyS has updated its 2018 RC risk assessment - see above
Noted that NEODyS has posted 2018 RP as an impact risk - see above
Grabbed MPEC 2018-R36 - 2015 OJ22 - see above
Grabbed MPEC 2018-R37 - 2016 EN1 - see above
Grabbed MPEC 2018-R38 - 2017 SN16 - see above
Grabbed MPEC 2018-R39 - Daily Orbit Update - see above
0430Noted that JPL Sentry has posted 2018 RP as an impact risk - see above
Grabbed MPEC 2018-R24 - 2005 FG - see above
Grabbed MPEC 2018-R25 - 2016 RH18 - see above
Grabbed MPEC 2018-R26 - 2017 SN14 - see above
Grabbed MPEC 2018-R27 - 2006 QM33 - see above
Grabbed MPEC 2018-R28 - 2018 RL - see above
Grabbed MPEC 2018-R29 - 2018 RM - see above
Grabbed MPEC 2018-R30 - 2018 RN - see above
Grabbed MPEC 2018-R31 - 2018 RQ - see above
Grabbed MPEC 2018-R32 - 2018 RO - see above
Grabbed MPEC 2018-R33 - 2018 RP - see above
Grabbed MPEC 2018-R34 - 2018 RR - see above
Grabbed MPEC 2018-R35 - 2018 RS - see above