Contents  on 4 October '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 4 October '18

Eight objects reported inside ten LD

Eight minor objects are known to be inside ten lunar distances (LD) of our home world today. Newly announced intruder 2018 TC is the closest. It heads out from 4.14 to 5.40 LD after passing us at 0.79 LD on September 30th.

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
0.23 LD Sept. 25 2018 SD2 6 m  5.96 to 6.62 LD Sept. 10 - Oct. 10 intruder, NHATS target, risk
0.79 LD Sept. 30 2018 TC 16 m  4.14 to 5.40 LD Sept. 23 - Oct. 8 NEW, intruder - MPEC, DOU
4.06 LD Sept. 24 2018 RQ1 51 m  7.37 to 7.95 LD Sept. 11 - Oct. 8 NHATS target, risk
4.83 LD Oct. 2 2018 TB 35 m  5.90 to 7.17 LD Sept. 27 - Oct. 6 NEW, risk - MPEC
5.39 LD Oct. 2 2018 SD3 9 m  5.97 to 6.89 LD Sept. 27 - Oct. 7 NHATS target
6.18 LD today 2018 SC3 21 m  6.18 LD Sept. 30 - Oct. 8 Earth closest at 0956 UTC - DOU
6.36 LD Sept. 30 2018 SO2 23 m  8.65 to 9.87 LD Sept. 26 - tomorrow NHATS target
6.69 LD Oct. 8 2018 SG3 13 m  7.83 from 8.59 LD Oct. 2 - 13 NHATS target - DOU
Approaching Traffic - sorted by 10-LD bubble entry date
3.1   LD Oct. 17* 2014 US7 18 m  24.9 from 26.8 LD Oct. 12 - 22 EPU +/- 3.10 hours*, NHATS target
9.0   LD Oct. 15* 2018 SL3 33 m  33.4 from 36.4 LD Oct. 14 - 17 EPU +/- 58 mins.*
8.7   LD Oct. 18* 2016 GC221 37 m  45.0 from 48.1 LD Oct. 17 - 20 EPU +/- 6.07 hours*
7.51 LD Oct. 29 475534 2006 TS7 195 m  102.27 from 106.61 LD Oct. 27 - 31 DOU
* EPU = Earth passage uncertainty

This report was generated at 2111 UTC with the discoveries of outbound objects intruder 2018 TC (MPEC, DOU) and risk-listed 2018 TB (MPEC). Today's DOU MPEC reports the recovery of approaching 475534 2006 TS7 and follow-up observations for inbound 2018 SG3, passing 2018 SC3, and two departed objects: 2018 LQ2 and risk-listed 2018 QS.



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 4 October '18

The MPC's NEO Confirmation Page has 68 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 68 objects listed. Of these, 46 were "one nighters." So far The Tracking News has counted a total of 83 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 4 October '18

Minor Planet Electronic Circulars

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


MPEC 2018-T51 - "17:18 UT" - 2013 UR22


MPEC 2018-T50 - "17:14 UT" - 2013 JX67


<< DOU on 4 Oct. '18 >>  MPEC 2018-T49 - "12:04 UT" - Daily Orbit Update


MPEC 2018-T48 - "10:29 UT" - 2018 TC


MPEC 2018-T47 - "10:26 UT" - 2018 TB


MPEC 2018-T46 - "10:23 UT" - 2018 SR3


MPEC 2018-T45 - "10:19 UT" - 2018 SQ3


MPEC 2018-T44 - "10:15 UT" - 2018 SP3

Observers  on 4 October '18

A total of 36 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 9 in MPECs 2018-T44, 2018-T45, 2018-T46 & 2018-T49 -- 2018 SR3, 2018 SQ3, 2018 SP3, 2018 RB, 2018 QR, 2018 PS24, 2018 PM22, 2018 PA20, 2018 OK
T05ATLAS Haleakala in Hawaii, 38 in MPECs 2018-T47, 2018-T48 & 2018-T49 -- 2018 TC, 2018 TB, 2018 SK1, 2018 RJ7, 2018 PJ22, 2018 PE22, 2018 NB, 2018 LZ5, 2018 LQ2, 2010 VB72, 523788, 523668, 523628, 481394, 443923, 438429, 418929, 31345, 256412, 253062, 250697, 250458, 250162, 21277, 18109, 17511, 17274, 162687, 162168, 13553, 12711, 115052, 105140, 9856, 6456, 4953, 2100, 719
T08ATLAS Mauna Loa in Hawaii, 10 in MPECs 2018-T47, 2018-T48 & 2018-T49 -- 2018 TC, 2018 TB, 2017 SN14, 2001 QA143, 65996, 54401, 503960, 455550, 349507, 3552
C77Bernezzo Obs. in Italy, 2 in MPECs 2018-T47 & 2018-T48 -- 2018 TC, 2018 TB
160Castelmartini Obs. in Italy, 11 in MPEC 2018-T49 -- 2018 KE3, 53789, 523619, 518635, 481394, 455594, 438429, 418929, 414960, 17274, 163818
K51Celado Obs. in Italy, 2 in MPECs 2018-T44 & 2018-T45 -- 2018 SQ3, 2018 SP3
309&Marco Micheli via Cerro Paranal in Chile, 1 in MPEC 2018-T49 -- 2018 QS
850Cordell-Lorenz Obs. in Tennessee, 3 in MPECs 2018-T47 & 2018-T49 -- 2018 TC, 2018 TB, 17274
J27El Guijo Obs. in Spain, 4 in MPEC 2018-T49 -- 518635, 455594, 438429, 418929
595Farra d'Isonzo Obs. in Italy, 2 in MPECs 2018-T47 & 2018-T48 -- 2018 TC, 2018 TB
X31Galilei Obs., 2 in MPECs 2018-T47 & 2018-T48 -- 2018 TC, 2018 TB
K88GINOP-KHK in Hungary, 2 in MPECs 2018-T47 & 2018-T48 -- 2018 TC, 2018 TB
J95Great Shefford Obs. in England, 3 in MPECs 2018-T45, 2018-T47 & 2018-T48 -- 2018 TC, 2018 TB, 2018 SQ3
Q62?B. Lutkenhoner in Germany via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-T47 -- 2018 TB
Q62[M. Suzuki in Japan via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-T47 -- 2018 TB
Q66JAXA Janess-G in New South Wales, 1 in MPEC 2018-T47 -- 2018 TB
K38M57 Obs. in Italy, 1 in MPEC 2018-T48 -- 2018 TC
568@Jean-Marc Petit on Mauna Kea in Hawaii, 2 in MPECs 2018-T50 & 2018-T51 -- 2013 UR22, 2013 JX67
474Mt. John Obs. in New Zealand, 7 in MPECs 2018-T47, 2018-T48 & 2018-T49 -- 2018 TC, 2018 TB, 2018 SN2, 2018 SG3, 2018 SC3, 2018 RM2, 2018 RJ7
G96Mt. Lemmon Survey (MLS) in Arizona, 4 in MPECs 2018-T45, 2018-T46 & 2018-T49 -- 2018 SR3, 2018 SQ3, 2018 SO3, 2018 RX27
J69North Obs. in England, 2 in MPECs 2018-T47 & 2018-T48 -- 2018 TC, 2018 TB
Z80Northolt Branch Obs. in England, 3 in MPECs 2018-T47, 2018-T48 & 2018-T49 -- 2018 TC, 2018 TB, 18109
I41Palomar Transient Factory in southern California, 1 in MPEC 2018-T49 -- 2018 SN3
F52Pan-STARRS 2 (PS2) in Hawaii, 23 in MPECs 2018-T44 & 2018-T49 -- 2018 SP3, 2018 SG3, 2018 SC3, 2018 NO4, 2018 LQ2, 2011 WM46, 2001 RQ17, 2001 QA143, 1993 TQ2, 481542, 475534, 468481, 457260, 382459, 373503, 34613, 308043, 250697, 216985, 18109, 170891, 16834, 5653
K63Pascoli Obs. in Italy, 5 in MPECs 2018-T47, 2018-T48 & 2018-T49 -- 2018 TC, 2018 TB, 2016 TZ56, 523631, 20790
L04ROASTERR-1 in Romania, 2 in MPECs 2018-T48 & 2018-T49 -- 2018 TC, 2018 SA3
H36Sandlot Obs. in Kansas, 1 in MPEC 2018-T47 -- 2018 TB
C95SATINO-1 in France, 1 in MPEC 2018-T49 -- 68950
204Schiaparelli Obs. in Italy, 5 in MPECs 2018-T44, 2018-T45, 2018-T46, 2018-T47 & 2018-T48 -- 2018 TC, 2018 TB, 2018 SR3, 2018 SQ3, 2018 SP3
G40*program code "*" (19) via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-T48 -- 2018 TC
G409B. Lutkenhoner in Germany via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-T47 -- 2018 TB
W885M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Chile Obs. in Chile, 1 in MPEC 2018-T49 -- 4401
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2018-T45 -- 2018 SQ3
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2018-T44 -- 2018 SP3
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2018-T49 -- 523619
I52Steward Obs. Mt. Lemmon Station in Arizona, 4 in MPECs 2018-T44, 2018-T45, 2018-T46 & 2018-T49 -- 2018 SR3, 2018 SQ3, 2018 SP3, 2018 RX27
L01Visnjan Obs., 5 in MPECs 2018-T44, 2018-T45, 2018-T46, 2018-T47 & 2018-T48 -- 2018 TC, 2018 TB, 2018 SR3, 2018 SQ3, 2018 SP3
C51WISE in Earth polar orbit, 2 in MPEC 2018-T49 -- 65706, 455550
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 4 October '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 TBJPL Sentry15172095-210326.9515e-07-6.44-6.470JPL: Computed at 04:30 today Pacific time based on 96 observations spanning 1.9606 days (2018-Oct-02.42196 to 2018-Oct-04.38253). Diameter approximately 0.035 km. from weighted mean H=24.92.
2018 SO3JPL Sentry15172040-2115302.37691e-08-7.39-8.170JPL: Computed at 07:31 today Pacific time based on 8 observations spanning 1.0095 days (2018-Sep-21.33298 to 2018-Sep-22.34251). Diameter approximately 0.039 km. from weighted mean H=24.68.
2018 SN3JPL Sentry15172033-21181190.0002423538372-5.80-5.990JPL: Computed at 07:48 today Pacific time based on 8 observations spanning 1.0232 days (2018-Sep-18.412141 to 2018-Sep-19.435354). Diameter approximately 0.004 km. from weighted mean H=29.85.
2018 SK3NEODyS15172025-2118974.18e-08-3.94-5.19n/aNEODyS: "Based on 25 optical observations (of which 0 are rejected as outliers) from 2018-09-30.304 to 2018-10-03.023."
2018 SD2NEODyS15172044-21181442.15e-04-5.81-6.28n/aNEODyS: "Based on 14 optical observations (of which 0 are rejected as outliers) from 2018-09-21.577 to 2018-09-23.500."
2018 RY1NEODyS1517207213.9e-09-8.28-8.280NEODyS: "Based on 71 optical observations (of which 0 are rejected as outliers) from 2018-09-07.140 to 2018-10-02.060."
2018 RQ1NEODyS1517211711.2e-07-7.04-7.040NEODyS: "Based on 111 optical observations (of which 1 are rejected as outliers) from 2018-09-07.381 to 2018-09-20.580."
2018 QSJPL Sentry20302084-208413.342e-08-8.27-8.270JPL #2 for the day: Computed at 11:59 today Pacific time based on 77 observations spanning 45.613 days (2018-Aug-18.47984 to 2018-Oct-03.093322). Diameter approximately 0.019 km. from weighted mean H=26.25.
2014 HJ198NEODyS15172034-211139.81e-08-7.18-7.230NEODyS: "Based on 19 optical observations (of which 0 are rejected as outliers) from 2014-04-24.121 to 2014-04-27.067."

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 4 October '18

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

2111Generated Traffic Report
2030Noted that JPL Sentry has updated its 2018 QS risk assessment - see above
1730Grabbed MPEC 2018-T50 - 2013 JX67 - see above
Grabbed MPEC 2018-T51 - 2013 UR22 - see above
1517Noted that NEODyS has updated its 2014 HJ198 risk assessment - see above
Noted that JPL Sentry has updated its 2018 QS risk assessment - see above
Noted that NEODyS has reposted 2018 RQ1 as an impact risk - see above
Noted that NEODyS has updated its 2018 RY1 risk assessment - see above
Noted that NEODyS has posted 2018 SD2 as an impact risk - see above
Noted that NEODyS has posted 2018 SK3 as an impact risk - see above
Noted that JPL Sentry has posted 2018 SN3 as an impact risk - see above
Noted that JPL Sentry has posted 2018 SO3 as an impact risk - see above
Noted that JPL Sentry has posted 2018 TB as an impact risk - see above
Grabbed MPEC 2018-T44 - 2018 SP3 - see above
Grabbed MPEC 2018-T45 - 2018 SQ3 - see above
Grabbed MPEC 2018-T46 - 2018 SR3 - see above
Grabbed MPEC 2018-T47 - 2018 TB - see above
Grabbed MPEC 2018-T48 - 2018 TC - see above
Grabbed MPEC 2018-T49 - Daily Orbit Update - see above