Contents  on 1 November '17

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 1 November '17

Nine objects reported inside ten LD

Nine minor planets are known to be inside ten lunar distances (LD) of Earth today. Nearest are 2017 UL8, outbound from 4.51 to 6.80 LD, and 2017 UD43, which comes its closest to our planet on this passage -- 4.68 LD at 1944 UTC.

Earth passage I D ~Size Distance Today  Notes
0.15 LD Oct. 282017 UL6 1 m  5.74 to 7.35 LD intruder, risk
0.59 LD Oct. 302017 UK8 8 m  5.62 to 8.75 LD intruder
1.16 LD Oct. 302017 UL8 8 m  4.51 to 6.80 LD
1.17 LD Oct. 272017 UP43 18 m  8.79 to 10.56 LD exits ten LD, risk
4.54 LD Nov. 52017 UJ43 9 m  7.26 from 8.60 LD risk
4.68 LD today2017 UD43 7 m  4.68 LD Earth closest at 1944 UTC
5.49 LD Oct. 302017 UJ6 17 m  6.23 to 7.75 LD
6.58 LD Oct. 312017 UO43 9 m  6.70 to 7.04 LD
7.05 LD Nov. 52017 US7 13 m  9.54 from 10.98 LD enters ten LD
Approaching
8.66 LD Nov. 17444584 2006 UK 309 m  < 10 LD Nov. 16 - DOU

This report was generated at 1951 UTC with follow-up in today's DOU MPEC for approaching 444584 2006 UK and for departed objects 171576 1999 VP11 and risk listed 2017 UQ7 and 2017 UL5, plus distant 2003 UV11.

Reading:  JPL's Eric Mamajek reports, in a paper entitled "Kinematics of the Interstellar Vagabond A/2017 U1," that his "calculations strengthen the interpretation that A/2017 U1 has a distant extrasolar origin, but not among the very nearest stars." (Hat tip to Brian Skiff at Lowell Observatory and the MPML.)
        The BBC has an article about results from the ongoing investingation of rock cores drilled last year from the Chicxulub Crater in the ocean off Mexico's Yucatan Peninsula. The item has several interesting links, such as how the impact caused a mountain higher than today's Himalayas to quickly rise and collapse as Earth's hard surface, under extreme pressures, acted like a fluid. And the impacting object, apparently an asteroid rather than a comet, is itself being sniffed out.



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 approached Earth within ten LD since A/CC began these traffic reports ten-plus years ago but is not currently coming 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.

NEOCP Activity  on 1 November '17

The MPC's NEO Confirmation Page has 73 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 73 objects listed. Of these, 26 were "one nighters."

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 1 November '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.


<< DOU on 1 Nov. '17 >>  MPEC 2017-V04 - "12:07 UT" - Daily Orbit Update


MPEC 2017-V03 - "10:25 UT" - 2014 GH17


MPEC 2017-V02 - "10:23 UT" - 2009 BM2


MPEC 2017-V01 - "03:44 UT" - A/2017 U1

Observers  on 1 November '17

A total of 28 observers appear in today's MPECs.

CodeObserver / observatory
705$program code "$" (13) via Apache Point Obs. in New Mexico, 1 in MPEC 2017-V01 -- 2017 U1
T08ATLAS Mauna Loa in Hawaii, 13 in MPEC 2017-V04 -- 2014 UR116, 2012 TV78, 2009 SP171, 99907, 496817, 496816, 495858, 420302, 162273, 140158, 8037, 2368, 1865
Q68Blue Mountains Obs. in New South Wales, 1 in MPEC 2017-V04 -- 154589
U63Burnt Tree Hill Obs., 2 in MPEC 2017-V04 -- 496005, 3122
160Castelmartini Obs. in Italy, 3 in MPEC 2017-V04 -- 96590, 496817, 337228
703Catalina Sky Survey (CSS) in Arizona, 9 in MPEC 2017-V04 -- 2017 UW42, 2014 YC15, 2014 UR116, 496005, 374851, 322763, 190208, 6053, 3200
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 4 in MPECs 2017-V02 & 2017-V04 -- 2017 UQ7, 2017 JW1, 2017 DQ37, 2009 BM2
J27El Guijo Obs. in Spain, 2 in MPEC 2017-V04 -- 500749, 496005
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2017-V04 -- 2017 UP44
W46Foxfire Village Obs., 1 in MPEC 2017-V04 -- 171576
203GiaGa Obs. in Italy, 1 in MPEC 2017-V04 -- 2017 SL2
P93JAXA Space Tracking & Communications Center (JAXA STCC) in Japan, 5 in MPEC 2017-V04 -- 2014 YC15, 2003 UV11, 21374, 8037, 1865
695^Spacewatch via Kitt Peak Natl. Obs. (KPNO) in Arizona, 2 in MPEC 2017-V04 -- 2017 UL5, 2015 KJ57
W85LCO Cerro Tololo A in Chile, 1 in MPEC 2017-V04 -- 2007 DM41
K93LCO Sutherland C in South Africa, 1 in MPEC 2017-V01 -- 2017 U1
130Lumezzane Obs. in Italy, 3 in MPEC 2017-V04 -- 500749, 444584, 143404
K38M57 Obs. in Italy, 2 in MPEC 2017-V04 -- 496005, 190208
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2017-V01 -- 2017 U1
G96Mt. Lemmon Survey (MLS) in Arizona, 9 in MPEC 2017-V04 -- 2017 UW42, 2005 VA2, 475967, 459451, 36284, 297418, 194126, 137078, 8176
J43Oukaimeden Obs. in Morocco, 2 in MPEC 2017-V04 -- 2017 SM16, 8037
F51Pan-STARRS 1 (PS1) in Hawaii, 14 in MPEC 2017-V04 -- 2017 UU7, 2017 SO17, 2017 HY50, 2000 WK107, 85818, 85184, 53430, 53319, 483560, 456536, 386720, 303933, 19764, 138847
K63Pascoli Obs. in Italy, 1 in MPEC 2017-V04 -- 2017 UP44
122Pises Obs. in France, 2 in MPEC 2017-V04 -- 2008 MH1, 420302
D29Purple Mtn. Obs. Xuyi Station in China, 3 in MPEC 2017-V04 -- 374851, 209924, 2212
L04ROASTERR-1 in Romania, 1 in MPEC 2017-V04 -- 2017 UP2
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2017-V04 -- 2017 UW42
I76Tesla Obs. in Spain, 3 in MPEC 2017-V04 -- 2014 YC15, 2014 UR116, 2003 UV11
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-V03 -- 2014 GH17
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 1 November '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 UP43NEODyS16002105-211671.76e-05-5.80-6.120NEODyS: "Based on 27 optical observations (of which 0 are rejected as outliers) from 2017-10-29.487 to 2017-10-31.441."
2017 UJ43NEODyS15222050-2116877.49e-05-5.76-5.950NEODyS: "Based on 16 optical observations (of which 3 are rejected as outliers) from 2017-10-28.509 to 2017-10-31.249."
2017 UE43NEODyS15222044-2113293.75e-06-4.98-5.510NEODyS: "Based on 14 optical observations (of which 0 are rejected as outliers) from 2017-10-28.365 to 2017-10-31.138."
2017 UC8NEODyS15222043-209846.59e-10-5.86-6.280NEODyS: "Based on 33 optical observations (of which 1 are rejected as outliers) from 2017-10-26.475 to 2017-10-29.517."
2017 UQ7JPL Sentry1522R E M O V E DJPL: Risk listing removed at 1506 UTC today
NEODyS1522209613.59e-09-8.64-8.640NEODyS: "Based on 51 optical observations (of which 2 are rejected as outliers) from 2017-10-26.212 to 2017-10-30.130."
2017 UL7NEODyS16002041-205421.03e-07-6.30-6.440NEODyS #2 for the day: "Based on 30 optical observations (of which 3 are rejected as outliers) from 2017-10-25.272 to 2017-10-28.264."
2017 UQ6NEODyS15222080-210974.75e-08-8.77-9.270NEODyS: "Based on 22 optical observations (of which 0 are rejected as outliers) from 2017-10-27.254 to 2017-10-31.436."
2017 UL6NEODyS15222052-2113381.72e-05-8.32-8.710NEODyS: "Based on 15 optical observations (of which 3 are rejected as outliers) from 2017-10-27.235 to 2017-10-28.009."
2017 UL5NEODyS16002100-211637.43e-07-7.21-7.290NEODyS #2 for the day: "Based on 39 optical observations (of which 6 are rejected as outliers) from 2017-10-22.463 to 2017-10-31.494."
JPL Sentry15222100-211122.6497e-07-7.58-7.610JPL: Computed at 07:51 today Pacific time based on 39 observations spanning 9.0315 days (2017-Oct-22.4618 to 2017-Oct-31.49333). Diameter approximately 0.018 km. from weighted mean H=26.38.
2017 UK1NEODyS15222066-2117388.64e-04-4.16-4.170NEODyS: "Based on 20 optical observations (of which 4 are rejected as outliers) from 2017-10-16.366 to 2017-10-27.330."
2017 TT3NEODyS1522R E M O V E D-
2017 TP2NEODyS1522R E M O V E D-
2008 VLJPL Sentry15222018-21166341.15652101e-05-6.36-7.550JPL: Computed at 10:17 April 8th Pacific time based on 8 observations spanning .12404 days (2008-Nov-02.31035 to 2008-Nov-02.43439). Diameter approximately 0.009 km. from weighted mean H=27.96.

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 1 November '17

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

1951Generated Traffic Report
1600Noted that NEODyS has updated its 2017 UL5 risk assessment - see above
Noted that NEODyS has updated its 2017 UL7 risk assessment - see above
Noted that NEODyS has posted 2017 UP43 as an impact risk - see above
1522Noted that JPL Sentry has updated its 2008 VL risk assessment - see above
Noted that NEODyS has removed 2017 TP2 as an impact risk - see above
Noted that NEODyS has removed 2017 TT3 as an impact risk - see above
Noted that NEODyS has posted 2017 UC8 as an impact risk - see above
Noted that NEODyS has posted 2017 UE43 as an impact risk - see above
Noted that NEODyS has posted 2017 UJ43 as an impact risk - see above
Noted that NEODyS has updated its 2017 UK1 risk assessment - see above
Noted that JPL Sentry has updated its 2017 UL5 risk assessment - see above
Noted that NEODyS has updated its 2017 UL5 risk assessment - see above
Noted that NEODyS has updated its 2017 UL6 risk assessment - see above
Noted that NEODyS has updated its 2017 UL7 risk assessment - see above
Noted that NEODyS has updated its 2017 UQ6 risk assessment - see above
Noted that JPL Sentry has removed 2017 UQ7 as an impact risk - see above
Noted that NEODyS has updated its 2017 UQ7 risk assessment - see above
Grabbed MPEC 2017-V02 - 2009 BM2 - see above
Grabbed MPEC 2017-V03 - 2014 GH17 - see above
Grabbed MPEC 2017-V04 - Daily Orbit Update - see above
0400Grabbed MPEC 2017-V01 - A/2017 U1 - see above