Contents  on 25 October '17

NOTE:  These A/CC news pages will update less often for a few days. All discoveries and observing credits will be reported, but we may miss some interim impact risk assessments and undercount NEOCP efforts, and there may be some days without a traffic report for Earth's Busy Neighborhood.

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 25 October '17

Ten objects reported inside ten LD

Ten asteroids are reported inside ten lunar distances (LD) of our planet today. (There were 15 yesterday.) Nearest is risk-listed 2017 UK3, which was announced yesterday. It moves away from Earth from 1.43 to 3.62 LD today after buzzing the Moon at 0.80 LD at 2311 UTC yesterday.

Earth passage I D ~Size Distance Today  Notes
0.05 LD Oct. 202017 UJ2 2 m  5.35 to 6.55 LD intruder, risk
1.38 LD yesterday2017 UK3 12 m  1.43 to 3.62 LD exits Earth SOI, Moon buzzer today, risk - MPEC
2.10 LD yesterday2017 UU2 18 m  2.16 to 3.69 LD exits Earth SOI - DOU
3.37 LD Oct. 222017 TV5 15 m  7.27 to 9.46 LD
4.18 LD Oct. 152017 TK4 10 m  9.39 to 10.22 LD exits ten LD
4.66 LD today2017 UE3 28 m  4.66 LD Earth closest at 1629 UTC - MPEC
4.80 LD Oct. 212017 TG4 48 m  9.89 to 12.20 LD exits ten LD - DOU
5.52 LD Oct. 222017 TQ5 11 m  6.36 to 7.11 LD DOU
6.64 LD Oct. 192017 TA6 16 m  8.30 to 8.93 LD risk
7.46 LD Oct. 222017 US 22 m  7.72 to 8.00 LD DOU, DOU
Approaching
8.66 LD Nov. 17444584 2006 UK 309 m  < 10 LD Nov. 16 - DOU

This report was generated at 1910 UTC with the discovery of two close passers announced early yesterday: 2017 UE3 (MPEC) and risk-listed 2017 UK3 (MPEC). The DOU MPEC yesterday reported observation of four objects in the active traffic table above (2017 UU2 first follow-up, 2017 US, 2017 TQ5, 2017 TG4) and six departed objects: first follow-up for 2017 UQ2 and 2017 UQ1 and continuing follow-up for 2017 TS1, 171576 1999 VP11, and risk listed objects 2017 SF20 (14.90 days added to 2.99-day observing arc) and 2017 RH16 (first follow-up, 29.63 days added to 5.08), plus distant 2003 UV1. Today's DOU MPEC has observation of active objects 2017 US, 2017 TH4, 444584 2006 UK and departed 2017 SA20 (first follow-up, 14.82 days added to 5.81), plus distant 2003 UV1.

Reading:  There are fascinating threads on the Minor Planet and Comets mailing lists discussing the possibility that newly announced C/2017 U1 (Panstarrs) (MPEC) is an interstellar object.



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 an object that has come within ten LD since A/CC began these traffic reports (2007) but is not now so close. Object 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.

Radar Astrometry  on 25 October '17

Radar observation of one object

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:


Data update noted at 2232 UTC when the database was dated 25 Oct.

NEOCP Activity  on 25 October '17

The MPC's NEO Confirmation Page has 116 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 116 objects listed. Of these, 41 were "one nighters." So far The Tracking News has counted a total of 120 listings on the NEOCP today.

New MPECs  on 25 October '17

Minor Planet Electronic Circulars

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


MPEC 2017-U183 - "22:22 UT" - A/2017 U1


<< DOU on 25 Oct. '17 >>  MPEC 2017-U182 - "12:06 UT" - Daily Orbit Update


MPEC 2017-U181 - "03:53 UT" - Comet C/2017 U1 (Panstarrs)

Quote: "If further observations confirm the unusual nature of this orbit, this object may be the first clear case of an interstellar comet."


MPEC 2017-U180 - "03:16 UT" - Comet C/2017 T2 (Panstarrs)

Observers  on 25 October '17

A total of 33 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 17 in MPEC 2017-U182 -- 2017 TH4, 2017 SW20, 2017 RX15, 2017 RV15, 2017 RV, 2017 RL2, 2017 RC15, 2017 QX34, 2017 QL35, 2017 PT25, 2017 PE, 2017 OG1, 2017 MU8, 2017 MF4, 2008 TC4, 498550, 374188
160Castelmartini Obs. in Italy, 7 in MPEC 2017-U182 -- 90075, 68950, 497176, 265962, 11500, 100926, 1980
703Catalina Sky Survey (CSS) in Arizona, 38 in MPEC 2017-U182 -- 2017 SS19, 2017 SL2, 2017 QQ32, 2017 QL18, 2017 OQ68, 2017 HH, 2015 BF4, 2009 SP171, 2008 MH1, 2007 DM41, 2006 KA40, 2003 UV11, 96590, 87311, 85628, 503293, 499307, 498143, 497176, 444584, 338292, 338176, 337228, 333888, 265962, 220909, 16834, 162998, 162273, 162011, 159399, 143404, 142563, 8567, 8037, 3361, 2212, 1865
107Cavezzo Obs. in Italy, 1 in MPEC 2017-U182 -- 2017 RR15
309&Marco Micheli via Cerro Paranal in Chile, 1 in MPEC 2017-U182 -- 2017 SA20
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 4 in MPEC 2017-U182 -- 2017 SS19, 2017 SH10, 2017 KN4, 2017 FQ64
A77Chante-Perdrix Obs. in France, 1 in MPEC 2017-U180 -- C/2017 T2
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2017-U180 -- C/2017 T2
J27El Guijo Obs. in Spain, 6 in MPEC 2017-U182 -- 2003 UV11, 65679, 497176, 457768, 333888, 1865
Z64El Miron del Cielo Obs. in Spain, 1 in MPEC 2017-U182 -- 2003 UV11
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 2 in MPECs 2017-U181 & 2017-U183 -- C/2017 U1, 2017 U1
734Farpoint Obs. in Kansas, 2 in MPECs 2017-U181 & 2017-U183 -- C/2017 U1, 2017 U1
K88GINOP-KHK in Hungary, 1 in MPEC 2017-U180 -- C/2017 T2
252Goldstone DSS-13 34m antenna in southern California, 1 in radar -- 2012 TC4
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 2012 TC4
256Green Bank in West Virginia, 1 in radar -- 2012 TC4
H15ISON New Mexico Obs. in New Mexico, 1 in MPEC 2017-U182 -- 2017 TK1
H06|Hidetaka Sato in Japan via iTelescope Obs. Mayhill in New Mexico, 2 in MPECs 2017-U181 & 2017-U183 -- C/2017 U1, 2017 U1
Q621Hidetaka Sato in Japan via iTelescope Obs. Siding Spring in New South Wales, 3 in MPECs 2017-U180, 2017-U181 & 2017-U183 -- C/2017 U1, 2017 U1, C/2017 T2
W89LCO Cerro Tololo Aqawan A#1 in Chile, 1 in MPEC 2017-U180 -- C/2017 T2
W87LCO Cerro Tololo C in Chile, 1 in MPEC 2017-U180 -- C/2017 T2
568_Marco Micheli on Mauna Kea in Hawaii, 1 in MPEC 2017-U180 -- C/2017 T2
474Mt. John Obs. in New Zealand, 10 in MPECs 2017-U180 & 2017-U182 -- 2017 US, 2017 UD3, 2017 TV4, 2017 TQ3, 2017 TB4, 2017 TA4, C/2017 T2, 2017 SK17, 2017 RP2, 2011 CX7
G96Mt. Lemmon Survey (MLS) in Arizona, 38 in MPECs 2017-U181, 2017-U182 & 2017-U183 -- 2017 US1, 2017 UQ, 2017 UK2, 2017 UC1, C/2017 U1, 2017 U1, 2017 TW3, 2017 TN2, 2017 TH6, 2017 SS19, 2017 SF14, 2017 QT35, 2017 QQ32, 2017 OG68, 2017 KS31, 2015 UM67, 2013 SL30, 2007 VO243, 2004 RX109, 2001 UQ163, 1982 YA, 90075, 498068, 329291, 274138, 220839, 185853, 16960, 162998, 162566, 162215, 143624, 138013, 137084, 6611, 4947, 3361, 2201
F51Pan-STARRS 1 (PS1) in Hawaii, 6 in MPECs 2017-U180, 2017-U181, 2017-U182 & 2017-U183 -- 2017 UQ, 2017 UC1, C/2017 U1, 2017 U1, C/2017 T2, 2006 TC
104San Marcello Pistoiese Obs. in Italy, 2 in MPECs 2017-U181 & 2017-U183 -- C/2017 U1, 2017 U1
G40#J.L. Tuten in Arkansas via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-U180 -- C/2017 T2
G409B. Lutkenhoner in Germany via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-U180 -- C/2017 T2
691Spacewatch 0.9m telescope in Arizona, 2 in MPECs 2017-U180 & 2017-U182 -- C/2017 T2, 2007 TF68
291Spacewatch 1.8m telescope in Arizona, 3 in MPECs 2017-U181, 2017-U182 & 2017-U183 -- C/2017 U1, 2017 U1, 2015 XD130
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2017-U182 -- 2017 QO36
I52Steward Obs. Mt. Lemmon Station in Arizona, 4 in MPECs 2017-U180, 2017-U181, 2017-U182 & 2017-U183 -- C/2017 U1, 2017 U1, C/2017 T2, 2007 DM41
A71Stixendorf Obs. in Austria, 1 in MPEC 2017-U180 -- C/2017 T2
926Tenagra II Obs. in Arizona, 3 in MPECs 2017-U181, 2017-U182 & 2017-U183 -- C/2017 U1, 2017 U1, 2007 DM41
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 25 October '17

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
2017 USJPL Sentry18042070-2117230.000542087032-4.15-4.550JPL: Computed at 08:21 today Pacific time based on 85 observations spanning 8.1414 days (2017-Oct-16.34512 to 2017-Oct-24.486564). Diameter approximately 0.022 km. from weighted mean H=25.98.
2017 SF20NEODyS17002034-203624.29e-04-4.55-4.550NEODyS: "Based on 29 optical observations (of which 2 are rejected as outliers) from 2017-09-28.368 to 2017-10-16.252."
2017 SA20JPL Sentry18042027-21174210.0007640356913-4.97-5.450JPL: Computed at 08:48 today Pacific time based on 26 observations spanning 20.629 days (2017-Sep-24.41378 to 2017-Oct-15.042445). Diameter approximately 0.008 km. from weighted mean H=28.25.
NEODyS17002027-211716334.55e-04-5.10-5.740NEODyS: "Based on 26 optical observations (of which 3 are rejected as outliers) from 2017-09-24.415 to 2017-10-15.043."
2017 RH16NEODyS17002026-2115991.5e-03-2.36-2.360NEODyS: "Based on 15 optical observations (of which 0 are rejected as outliers) from 2017-09-13.336 to 2017-10-18.045."

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 25 October '17

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

2358Grabbed MPEC 2017-U183 - A/2017 U1 - see above
2232Noted Radar Astrometry database update - see above
1910Generated Traffic Report
1804Noted that JPL Sentry has updated its 2017 SA20 risk assessment - see above
Noted that JPL Sentry has updated its 2017 US risk assessment - see above
1700Noted that NEODyS has updated its 2017 RH16 risk assessment - see above
Noted that NEODyS has updated its 2017 SA20 risk assessment - see above
Noted that NEODyS has updated its 2017 SF20 risk assessment - see above
Grabbed MPEC 2017-U182 - Daily Orbit Update - see above
0621Grabbed MPEC 2017-U181 - Comet C/2017 U1 (Panstarrs) - see above
0346Grabbed MPEC 2017-U180 - Comet C/2017 T2 (Panstarrs) - see above