Contents  on 17 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 17 September '18

Sixteen objects reported inside ten LD

Sixteen objects are known to be inside ten lunar distances (LD) of our planet today. Nearest is 2018 RN7, which exits Earth's sphere of gravitational influence as it flies off from 2.25 to 5.51 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
0.58 LD Sept. 9 2018 RC 36 m  8.52 to 9.66 LD Aug. 31 - tomorrow intruder, NHATS target
1.23 LD Sept. 13 2018 RE8 13 m  6.95 to 9.19 LD Sept. 9 - 18 NEW - MPEC
1.37 LD Sept. 19 2018 RF8 25 m  4.58 from 8.04 LD yesterday - Sept. 22 NEW, Moon buzzer - MPEC, DOU
1.48 LD Sept. 15 2018 RE5 11 m  6.51 to 9.89 LD Sept. 12 - 18 Moon buzzer
1.52 LD yesterday 2018 RB6 23 m  2.85 to 5.66 LD Sept. 12 - 19
1.84 LD Sept. 13 2018 RE3 13 m  8.19 to 10.45 LD Sept. 9 - 17 NHATS target, exits ten LD
2.03 LD yesterday 2018 RN7 11 m  2.25 to 5.51 LD Sept. 14 - 19 exits Earth SOI
2.41 LD today 2018 RK6 9 m  2.41 LD Sept. 10 - 24 NHATS target, Earth closest at 1034 UTC
2.78 LD today 2018 RM7 8 m  2.78 LD Sept. 14 - 19 Earth closest at 0516 UTC
3.22 LD Sept. 12 2018 RR4 13 m  9.43 to 11.31 LD Sept. 7 - 17 exits ten LD
3.54 LD yesterday 2018 RG8 15 m  3.54 to 3.91 LD Sept. 10 - 22 NEW - MPEC, DOU
4.06 LD Sept. 24 2018 RQ1 51 m  6.26 from 6.80 LD Sept. 11 - Oct. 8 NHATS target - DOU
4.39 LD Sept. 12 2018 RD5 23 m  8.35 to 9.62 LD Sept. 5 - 18 NHATS target - DOU
4.50 LD yesterday 2018 RG5 15 m  4.52 to 5.04 LD Sept. 11 - 21 NHATS target
8.00 LD yesterday 2018 RA2 27 m  8.01 to 8.39 LD Sept. 13 - 19 NHATS target
8.50 LD Sept. 20 2017 SL16 23 m  9.45 from 10.16 LD today - Sept. 24 NHATS target, enters ten LD
Approaching Traffic
8.56 LD Sept. 22 2018 RH6 11 m  10.77 from 11.64 LD Sept. 19 - 26 NHATS target - DOU

This report was generated at 2120 UTC with the discoveries announced late yesterday of inbound 2018 RF8 (MPEC, DOU) and outbound objects 2018 RG8 (MPEC, DOU) and 2018 RE8 (MPEC). Today's DOU MPEC has follow-up for three other objects in the active traffic table above and for sixteen departed objects: 2018 RT5, 2018 RR5, 2018 RO5, 2018 RY3, 2018 RH3, 2018 RG3, 2018 RQ2, 2018 QW1, 2018 PP9, 2015 SW6, and including intruders 2018 RZ5, 2018 RY5, and risk-listed 2018 RJ3, as well as three other objects with impact solutions: 2018 RP5, 2018 RF5, and 2018 RB2, plus observation of distant objects 388945 2008 TZ3 and 450894 2008 BT18.



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 objects that have come within ten LD since A/CC began these traffic reports (2007) but are not now 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 17 September '18

The MPC's NEO Confirmation Page has 38 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 38 objects listed. Of these, twelve were "one nighters." So far The Tracking News has counted a total of 51 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 17 September '18

Minor Planet Electronic Circulars

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


MPEC 2018-S24 - "21:00 UT" - S/2011 J 1


MPEC 2018-S23 - "16:52 UT" - 2018 RO8


<< DOU on 17 Sept. '18 >>  MPEC 2018-S22 - "12:06 UT" - Daily Orbit Update

Observers  on 17 September '18

A total of 27 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 18 in MPECs 2018-S22 & 2018-S23 -- 2018 RY, 2018 RV1, 2018 RS1, 2018 RO8, 2018 RO2, 2018 RB2, 2018 QW1, 2018 QW, 2018 PK21, 2018 PJ9, 2018 NR, 2018 NN, 2015 SW6, 2011 TX8, 2008 VB1, 1998 KH9, 256670, 142555
T05ATLAS Haleakala in Hawaii, 41 in MPEC 2018-S22 -- 2018 RR5, 2018 RQ1, 2018 RD7, 2018 RD5, 2018 NU3, 2018 MM8, 2018 KR2, 2015 RJ83, 2013 EP41, 2008 RT26, 2005 UY5, 2005 RB, 2003 RC2, 2001 RQ17, 1999 RV2, 68359, 54789, 517829, 517681, 468684, 443923, 358744, 350988, 337252, 21277, 190788, 18109, 180186, 17511, 163373, 140333, 136849, 5786, 5751, 5653, 5646, 4954, 4401, 4183, 1916, 1627
T08ATLAS Mauna Loa in Hawaii, 17 in MPEC 2018-S22 -- 2018 PJ22, 2018 NB, 2015 FP118, 2011 UA, 2009 SX1, 2004 QB17, 86324, 68950, 65733, 518635, 481394, 457260, 438429, 418929, 115052, 3691, 1865
703Catalina Sky Survey (CSS) in Arizona, 46 in MPECs 2018-S22 & 2018-S23 -- 2018 RX, 2018 RR5, 2018 RQ5, 2018 RQ1, 2018 RO8, 2018 RG8, 2018 RD5, 2018 QV1, 2018 QP, 2018 MM8, 2018 LZ5, 2018 KR2, 2015 RJ83, 2015 RB82, 2013 EP41, 2007 RX19, 2005 RB, 2004 QJ7, 2001 SC170, 2001 RQ17, 87311, 68359, 517829, 445267, 443923, 422977, 350988, 337252, 337248, 337118, 333889, 253841, 253062, 250697, 243566, 17511, 17274, 162168, 152787, 140039, 13553, 5751, 5653, 4953, 4401, 4183
V06Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) in Arizona, 17 in MPEC 2018-S22 -- 2018 RY6, 2018 RY5, 2018 RW6, 2018 RW5, 2018 RU5, 2018 RT1, 2018 RL4, 2018 RJ6, 2018 RJ3, 2018 RG3, 2018 RF7, 2018 RF5, 2018 RB4, 2018 PO10, 2018 PH9, 2017 CW1, 2013 CN128
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2018-S22 -- 2018 RZ1
006Fabra Obs. in Spain, 2 in MPEC 2018-S22 -- 17274, 144332
734Farpoint Obs. in Kansas, 1 in MPEC 2018-S23 -- 2018 RO8
K88GINOP-KHK in Hungary, 1 in MPEC 2018-S23 -- 2018 RO8
238Grorudalen Obs. in Norway, 1 in MPEC 2018-S22 -- 2015 FP118
A17Guidestar Obs. in Germany, 6 in MPEC 2018-S22 -- 2018 RS1, 2018 RO7, 2018 RC1, 2018 RA4, 2018 QV1, 2018 LZ5
W19Kalamazoo Obs. in Michigan, 1 in MPEC 2018-S22 -- 2015 FP118
Z22MASTER IAC Obs. in the Canary Islands, 1 in MPEC 2018-S22 -- 31345
B67Mirasteilas Obs. in Switzerland, 2 in MPEC 2018-S22 -- 2013 EP41, 2001 SK276
G96Mt. Lemmon Survey (MLS) in Arizona, 20 in MPEC 2018-S22 -- 2018 RZ1, 2018 MM8, 2018 KB1, 2017 SN16, 2015 RB82, 2014 QP363, 2014 HM187, 2012 DJ4, 2011 CX46, 2001 VC2, 517829, 450894, 450263, 445267, 443923, 419464, 388945, 337118, 136849, 5751
I41Palomar Transient Factory (PTF) in southern California, 7 in MPEC 2018-S22 -- 2018 RQ2, 2018 LZ5, 2004 QB17, 2001 RQ17, 68359, 17274, 5751
K81PMPHR Obs., 1 in MPEC 2018-S22 -- 418929
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2018-S23 -- 2018 RO8
H36Sandlot Obs. in Kansas, 1 in MPEC 2018-S23 -- 2018 RO8
C95SATINO-1 in France, 1 in MPEC 2018-S22 -- 6456
033Schwarzschild Obs. in Germany, 3 in MPECs 2018-S22 & 2018-S23 -- 2018 RW7, 2018 RO8, 2018 RF8
Y28Sertao de Itaparica Obs. in Brazil, 1 in MPEC 2018-S22 -- 2018 RZ5
691Spacewatch 0.9m telescope in Arizona, 11 in MPEC 2018-S22 -- 2018 RU1, 2018 RS1, 2018 RO2, 2018 RJ7, 2018 RH3, 2018 NN, 2018 KR2, 2007 RX19, 2001 SC170, 515010, 31345
291Spacewatch 1.8m telescope in Arizona, 5 in MPEC 2018-S22 -- 2018 RB7, 2018 PP9, 2018 PK21, 2018 FS3, 2014 YB35
I52Steward Obs. Mt. Lemmon Station in Arizona, 32 in MPECs 2018-S22 & 2018-S23 -- 2018 RZ2, 2018 RX6, 2018 RX3, 2018 RX1, 2018 RW1, 2018 RV1, 2018 RU3, 2018 RT5, 2018 RS5, 2018 RR5, 2018 RR3, 2018 RQ5, 2018 RP5, 2018 RP2, 2018 RO8, 2018 RO7, 2018 RO5, 2018 RN4, 2018 RJ7, 2018 RH7, 2018 RH6, 2018 RG7, 2018 RE6, 2018 RD5, 2018 RC7, 2018 RC5, 2018 RC4, 2018 RC1, 2018 RB5, 2018 RB3, 2018 RB, 2018 RA4
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 3 in MPEC 2018-S22 -- 2018 RY3, 2018 NH2, 363027
L01Visnjan Obs., 1 in MPEC 2018-S23 -- 2018 RO8
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 17 September '18

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2359 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 RJ7JPL Sentry16002057-207132.56155e-08-5.60-5.810JPL: Computed at 08:37 today Pacific time based on 32 observations spanning 4.0991 days (2018-Sep-13.26203 to 2018-Sep-17.36115). Diameter approximately 0.210 km. from weighted mean H=21.09.
2018 RB7JPL Sentry16002093-209312.891e-07-4.95-4.950JPL: Computed at 08:16 today Pacific time based on 21 observations spanning 4.9728 days (2018-Sep-12.46817 to 2018-Sep-17.44096). Diameter approximately 0.180 km. from weighted mean H=21.42.
2018 RP5NEODyS1600210912.27e-09-9.48-9.480NEODyS: "Based on 40 optical observations (of which 1 are rejected as outliers) from 2018-09-13.234 to 2018-09-16.229."
2018 RF5JPL Sentry16002103-211538.8793e-06-6.53-6.820JPL: Computed at 08:20 today Pacific time based on 44 observations spanning 5.0314 days (2018-Sep-12.23986 to 2018-Sep-17.27126). Diameter approximately 0.011 km. from weighted mean H=27.37.
NEODyS16002069-211558.64e-06-6.56-6.810NEODyS: "Based on 41 optical observations (of which 0 are rejected as outliers) from 2018-09-12.241 to 2018-09-16.412."
2018 RQ4NEODyS16002098-2113121.85e-06-7.03-7.540NEODyS: "Based on 33 optical observations (of which 0 are rejected as outliers) from 2018-09-11.282 to 2018-09-16.340."
2018 RJ3JPL Sentry16002070-207011.288e-06-7.38-7.380JPL: Computed at 08:29 today Pacific time based on 48 observations spanning 7.8147 days (2018-Sep-09.56735 to 2018-Sep-17.382). Diameter approximately 0.009 km. from weighted mean H=27.83.
NEODyS16002070-209137.62e-06-6.60-6.60NEODyS: "Based on 44 optical observations (of which 0 are rejected as outliers) from 2018-09-09.568 to 2018-09-16.383."
2018 RB2JPL Sentry16002092-2117283.307983e-05-5.89-6.290JPL: Computed at 08:04 today Pacific time based on 52 observations spanning 9.1891 days (2018-Sep-07.26955 to 2018-Sep-16.4586). Diameter approximately 0.012 km. from weighted mean H=27.29.
NEODyS16002089-2118905.47e-05-5.70-5.97n/aNEODyS: "Based on 50 optical observations (of which 0 are rejected as outliers) from 2018-09-07.270 to 2018-09-16.459."
2018 RY1NEODyS16002040-2117102.29e-07-6.32-6.50NEODyS: "Based on 62 optical observations (of which 0 are rejected as outliers) from 2018-09-07.140 to 2018-09-15.262."
2018 RR1NEODyS16002083-2118371.71e-05-7.61-8.17n/aNEODyS: "Based on 32 optical observations (of which 1 are rejected as outliers) from 2018-09-07.394 to 2018-09-15.468."
2018 RQ1NEODyS1600R E M O V E D-
2018 QSNEODyS16002084-211637.12e-06-5.96-5.990NEODyS: "Based on 74 optical observations (of which 0 are rejected as outliers) from 2018-08-18.481 to 2018-09-15.461."

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 17 September '18

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

2130Grabbed MPEC 2018-S24 - S/2011 J 1 - see above
2120Generated Traffic Report
1700Grabbed MPEC 2018-S23 - 2018 RO8 - see above
1600Noted 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 updated its 2018 RB2 risk assessment - see above
Noted that JPL Sentry has updated its 2018 RB7 risk assessment - see above
Noted that JPL Sentry has updated its 2018 RF5 risk assessment - see above
Noted that NEODyS has updated its 2018 RF5 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 JPL Sentry has updated its 2018 RJ7 risk assessment - see above
Noted that NEODyS has updated its 2018 RP5 risk assessment - see above
Noted that NEODyS has removed 2018 RQ1 as an impact risk - see above
Noted that NEODyS has updated its 2018 RQ4 risk assessment - see above
Noted that NEODyS has updated its 2018 RR1 risk assessment - see above
Noted that NEODyS has updated its 2018 RY1 risk assessment - see above
Grabbed MPEC 2018-S22 - Daily Orbit Update - see above