Contents  on 2 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 2 October '18

Six objects reported inside ten LD

Six transient natural objects are reported within ten lunar distances (LD) of our planet today. Nearest are risk-listed intruder 2018 SD2, moving away from 4.64 to 5.30 LD, and 2018 SP2, heading out from 4.72 to 7.73 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
0.23 LD Sept. 25 2018 SD2 6 m  4.64 to 5.30 LD Sept. 10 - Oct. 10 intruder, NHATS target, risk
2.13 LD Sept. 30 2018 SP2 35 m  4.72 to 7.73 LD Sept. 27 - tomorrow DOU
4.06 LD Sept. 24 2018 RQ1 51 m  6.28 to 6.81 LD Sept. 11 - Oct. 8 NHATS target
5.89 LD Sept. 30 2018 SE2 39 m  7.74 to 9.61 LD Sept. 26 - tomorrow
6.36 LD Sept. 30 2018 SO2 23 m  6.83 to 7.60 LD Sept. 26 - Oct. 5 NHATS target - DOU
6.79 LD Sept. 27 2018 SM1 89 m  8.78 to 9.61 LD Sept. 21 - tomorrow NHATS target - DOU
Approaching Traffic - sorted by 10-LD bubble entry date
3.1   LD Oct. 17* 2014 US7 18 m  28.8 from 30.8 LD Oct. 12 - 22 EPU +/- 3.10 hours*, NHATS target
8.7   LD Oct. 18* 2016 GC221 37 m  51.3 from 54.5 LD Oct. 17 - 20 EPU +/- 6.07 hours*
7.51 LD Oct. 29 475534 2006 TS7 195 m  110.96 from 115.34 LD Oct. 27 - 31
* EPU = Earth passage uncertainty

This report was generated at 1944 UTC with follow-up in today's DOU MPEC for three objects in the active traffic table above, and with pre-discovery observations of risk-listed 2014 HJ198, expanding its observing arc from 1.01 to 2.95 days.


<< Reading:  The October 2015 discovery of the third known inner Oort Cloud (IOC) object was announced yesterday in an MPEC. It was found with the 8.2-meter Subaru telescope. More details and discussion have been presented today in a science paper preprint from the discoverers and a news item from the Carnegie Institution for Science. The orbit of 2015 TG387, like some others, appears to be in resonance with an as yet undiscovered ninth planet larger than Earth located in the outer Solar System."



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 2 October '18

The MPC's NEO Confirmation Page has 58 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 58 objects listed. Of these, 25 were "one nighters." So far The Tracking News has counted a total of 66 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 2 October '18

Minor Planet Electronic Circulars

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


MPEC 2018-T19 - "18:42 UT" - 11 New 5:3 Neptune-Resonant Objects


MPEC 2018-T18 - "17:48 UT" - 12 New 5:2 Neptune-Resonant Objects


<< DOU on 2 Oct. '18 >>  MPEC 2018-T17 - "12:04 UT" - Daily Orbit Update


MPEC 2018-T16 - "03:06 UT" - 29 New 7:4 Neptune-Resonant Objects


MPEC 2018-T15 - "00:57 UT" - Four New 4:1 Neptune-Resonant Objects

Observers  on 2 October '18

Nineteen observers appear in today's MPECs.

CodeObserver / observatory
C97Al-Fulaij Obs., 2 in MPEC 2018-T17 -- 86324, 1627
H21Astronomical Research Obs. Westfield in Illinois, 8 in MPEC 2018-T17 -- 2018 SQ2, 2018 SP2, 2018 SO2, 2018 SN2, 2018 RA5, 2018 QR, 2018 PW23, 2018 PA20
T05ATLAS Haleakala in Hawaii, 15 in MPEC 2018-T17 -- 2018 SR1, 2018 SM1, 2018 EB, 65996, 54401, 523595, 503960, 468481, 455550, 446924, 442742, 349507, 16834, 3552, 3200
T08ATLAS Mauna Loa in Hawaii, 25 in MPEC 2018-T17 -- 2018 RL2, 2018 QP, 2018 PE22, 2001 RQ17, 523788, 523628, 481394, 443923, 438429, 418929, 31345, 250697, 21277, 18109, 17511, 17274, 162168, 13553, 12711, 115052, 105140, 9856, 6456, 4183, 719
160Castelmartini Obs. in Italy, 12 in MPEC 2018-T17 -- 2018 RS1, 2011 UA, 2001 QA143, 65996, 65733, 523788, 523631, 523604, 443923, 20790, 16834, 115052
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 16 in MPEC 2018-T17 -- 2018 SR2, 2018 SK1, 2018 RX1, 2018 RW7, 2018 RW27, 2018 RU3, 2018 RP2, 2018 RL2, 2018 RE7, 2018 RD7, 2018 RB3, 2018 QY, 2018 QN1, 2018 PB22, 2018 NE2, 2018 LC3
W84%program code "%" (14) via DECam in Chile, 1 in MPEC 2018-T17 -- 2014 HJ198
006Fabra Obs. in Spain, 3 in MPEC 2018-T17 -- 418929, 17274, 13553
Q62?B. Lutkenhoner in Germany via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-T17 -- 1627
Z22MASTER IAC Obs. in the Canary Islands, 1 in MPEC 2018-T17 -- 4401
568@Jean-Marc Petit on Mauna Kea in Hawaii, 56 in MPECs 2018-T15, 2018-T16, 2018-T18 & 2018-T19 -- 2015 VZ166, 2015 VY166, 2015 VX166, 2015 VW166, 2015 VV166, 2015 VU166, 2015 VT166, 2015 VS166, 2015 VR166, 2015 VQ166, 2015 VP166, 2015 VO166, 2015 VK167, 2015 VJ167, 2015 VH167, 2015 VG167, 2015 VF167, 2015 VE167, 2015 VD167, 2015 VC167, 2015 VB167, 2015 VA167, 2015 RK278, 2015 RJ278, 2015 RH278, 2015 RG278, 2015 RF278, 2015 RE278, 2015 RD278, 2015 RC278, 2015 RB278, 2015 KZ173, 2015 KM174, 2015 KL174, 2015 KK174, 2015 KJ174, 2015 KH174, 2015 KG174, 2015 KF174, 2015 KE174, 2015 KD174, 2015 KC174, 2015 KB174, 2015 KA174, 2015 GO55, 2015 GN55, 2015 GM55, 2015 GL55, 2015 GK55, 2015 GJ55, 2015 GH55, 2015 GG55, 2015 GF55, 2015 GE55, 2015 GD55, 2015 GC55
474Mt. John Obs. in New Zealand, 11 in MPEC 2018-T17 -- 2018 SO2, 2018 SN2, 2018 RZ1, 2018 RR8, 2018 PX23, 2018 PX19, 2018 PB20, 2018 NS1, 2017 ER22, 2015 TF202, 2012 LK2
Z80Northolt Branch Obs. in England, 1 in MPEC 2018-T17 -- 523788
F52Pan-STARRS 2 (PS2) in Hawaii, 6 in MPEC 2018-T17 -- 67399, 523604, 523592, 180186, 4183, 3691
D29Purple Mtn. Obs. Xuyi Station in China, 15 in MPEC 2018-T17 -- 2002 EC3, 2001 RQ17, 65733, 523621, 523604, 523599, 523596, 31345, 18109, 17511, 155340, 144922, 140039, 11500, 5797
C95SATINO-1 in France, 1 in MPEC 2018-T17 -- 31345
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2018-T17 -- 17274
Z52The Studios Obs., 1 in MPEC 2018-T17 -- 13553
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2018-T17 -- 2018 QU
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 2 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
2014 HJ198JPL Sentry15302034-203415.418e-08-7.17-7.170JPL: Computed at 07:05 today Pacific time based on 29 observations spanning 2.9454 days (2014-Apr-24.12031 to 2014-Apr-27.06573). Diameter approximately 0.017 km. from weighted mean H=26.50.

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 2 October '18

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

1944Generated Traffic Report
1900Grabbed MPEC 2018-T19 - 11 New 5:3 Neptune-Resonant Objects - see above
1808Grabbed MPEC 2018-T18 - 12 New 5:2 Neptune-Resonant Objects - see above
1530Noted that JPL Sentry has updated its 2014 HJ198 risk assessment - see above
Grabbed MPEC 2018-T17 - Daily Orbit Update - see above
0431Grabbed MPEC 2018-T16 - 29 New 7:4 Neptune-Resonant Objects - see above
0130Grabbed MPEC 2018-T15 - Four New 4:1 Neptune-Resonant Objects - see above