Contents  on 8 December '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 8 December '17

Five objects reported inside ten LD

There are five transient natural objects known to be inside ten lunar distances (LD) of Earth today. Nearest are newly announced 2017 XE, headed away from 3.97 to 4.22 LD, and 2017 WV12, which is inbound from 5.68 to 4.05 LD.

Earth passage I D ~Size Distance today  Inside ten LD Notes
3.35 LD Dec. 14 2006 XY 54 m  6.90 from 7.86 LD Dec. 5 - 23 NHATS target
3.43 LD tomorrow 2017 WV12 26 m  4.05 from 5.68 LD Dec. 5 - 13 DOU
3.67 LD Dec. 2 2008 WM61 15 m  6.82 to 7.72 LD Nov. 23 - Dec. 11 NHATS target
3.72 LD Nov. 29 2017 WF16 6 m  8.96 to 9.80 LD Nov. 19 - tomorrow NHATS target
3.97 LD yesterday 2017 XE 22 m  3.97 to 4.22 LD Dec. 1 - 14 NEW - MPEC
Approaching (sorted by 10-LD bubble entry date)
9.71 LD Dec. 14 2015 XX169 11 m  12.02 from 12.91 LD Dec. 12 - 15 NHATS target - DOU
3.83 LD Dec. 17 2017 VT14 100 m  19.22 from 21.50 LD Dec. 13 - 21 radar target, comet nucleus?
7.6   LD Dec. 24* 2017 WZ14 31 m  19.1 from 20.2 LD Dec. 18 - 30 EPU +/- 54 mins.*, radar/NHATS target
3.7   LD Feb. 24* 2017 DR109 10 m  183.5 from 186.7 LD Feb. 18 - March 1 EPU +/- 30 mins.*, NHATS target
3.8   LD March 7* 2017 VR12 267 m  129.4 from 131.5 LD Feb. 28 - March 13 EPU +/- 24 mins.*, radar/NHATS target - DOU
* EPU = Earth passage uncertainty

This report was updated at 2240 UTC with the discovery of 2017 XE (MPEC). Your first local flying rocks traffic report was generated at 1810 UTC with the recovery of returning 2015 XX169 in today's DOU MPEC along with follow-up for inbound 2017 WV12, approaching 2017 VR12, and departed objects 496817 1989 VB and risk-listed 2017 VJ, plus astrometry from October for 171576 1999 VP11.



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 8 December '17

The MPC's NEO Confirmation Page has 53 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 53 objects listed. Of these, 24 were "one nighters." So far The Tracking News has counted a total of 62 listings on the NEOCP today.

New MPECs  on 8 December '17

Minor Planet Electronic Circulars

As of last check at 2359 UTC, there have been nine MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2017-X81 - "20:06 UT" - 2017 XF


MPEC 2017-X80 - "20:00 UT" - 2017 XE


MPEC 2017-X79 - "19:55 UT" - 2017 XD


MPEC 2017-X78 - "19:50 UT" - 2017 WA29


<< DOU on 8 Dec. '17 >>  MPEC 2017-X77 - "13:03 UT" - Daily Orbit Update


MPEC 2017-X76 - "01:11 UT" - 2017 XC


MPEC 2017-X75 - "01:08 UT" - 2017 WZ28


MPEC 2017-X74 - "01:04 UT" - 2017 WY28


MPEC 2017-X73 - "01:00 UT" - 2017 WX28

Observers  on 8 December '17

A total of 43 observers appear in today's MPECs.

CodeObserver / observatory
834AAAA Buenos Aires Obs. in Argentina, 1 in MPEC 2017-X77 -- 171576
H21Astronomical Research Obs. Westfield in Illinois, 17 in MPECs 2017-X76, 2017-X77, 2017-X80 & 2017-X81 -- 2017 XF, 2017 XE, 2017 XC, 2017 WX12, 2017 WV12, 2017 VW13, 2014 YC15, 2014 VU1, 505178, 21374, 190208, 17511, 154991, 144898, 140158, 10165, 7977
T08ATLAS Mauna Loa in Hawaii, 12 in MPEC 2017-X77 -- 2014 JC31, 53430, 507366, 504887, 457768, 438017, 17182, 163696, 137062, 6053, 3200, 1580
069Baldone Obs. in Latvia, 1 in MPEC 2017-X77 -- 2016 AU8
C77Bernezzo Obs. in Italy, 1 in MPEC 2017-X80 -- 2017 XE
160Castelmartini Obs. in Italy, 5 in MPEC 2017-X77 -- 68950, 504680, 349928, 11066, 1980
703Catalina Sky Survey (CSS) in Arizona, 17 in MPECs 2017-X77 & 2017-X80 -- 2017 XE, 2017 SO17, 2014 YC15, 2014 JC31, 88188, 85818, 475967, 374851, 349928, 337228, 17511, 17182, 163696, 152931, 137062, 6053, 1866
V06Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) in Arizona, 2 in MPECs 2017-X73 & 2017-X78 -- 2017 WX28, 2017 WA29
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 13 in MPECs 2017-X77 & 2017-X79 -- 2017 XD, 2017 WX27, 2017 WJ28, 2017 WG2, 2017 WA13, 2017 VU13, 2017 VM13, 2017 UY4, 2017 TA4, 2017 SB14, 2017 RD15, 2017 QL35, 2017 NU6
113Drebach Obs. in Germany, 1 in MPEC 2017-X80 -- 2017 XE
K05Eden Obs., 1 in MPEC 2017-X77 -- 3200
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2017-X76 -- 2017 XC
K83Forti Obs., 2 in MPEC 2017-X77 -- 163696, 140158
K88GINOP-KHK in Hungary, 1 in MPEC 2017-X80 -- 2017 XE
K73Gravina Obs. in Italy, 1 in MPEC 2017-X77 -- 3200
J95Great Shefford Obs. in England, 3 in MPECs 2017-X76, 2017-X80 & 2017-X81 -- 2017 XF, 2017 XE, 2017 XC
C43Hoyerswerda Obs. in Germany, 1 in MPEC 2017-X80 -- 2017 XE
P93JAXA Space Tracking & Communications Center in Japan, 1 in MPEC 2017-X76 -- 2017 XC
695^Spacewatch via Kitt Peak Natl. Obs. (KPNO) in Arizona, 8 in MPECs 2017-X73, 2017-X74, 2017-X75 & 2017-X77 -- 2017 WZ28, 2017 WZ12, 2017 WY28, 2017 WY14, 2017 WX28, 2017 VV, 2017 VJ, 2017 UQ51
246KLENOT in the Czech Republic, 1 in MPEC 2017-X80 -- 2017 XE
W85LCO Cerro Tololo A in Chile, 1 in MPEC 2017-X77 -- 2017 WX12
W87LCO Cerro Tololo C in Chile, 1 in MPEC 2017-X77 -- 2017 WX12
H01Magdalena Ridge Obs. (MRO) in New Mexico, 2 in MPECs 2017-X80 & 2017-X81 -- 2017 XF, 2017 XE
Z22MASTER IAC Obs. in the Canary Islands, 1 in MPEC 2017-X77 -- 496818
568_Marco Micheli on Mauna Kea in Hawaii, 1 in MPEC 2017-X74 -- 2017 WY28
G96Mt. Lemmon Survey (MLS) in Arizona, 5 in MPECs 2017-X77, 2017-X80 & 2017-X81 -- 2017 XF, 2017 XE, 2017 VR12, 2017 VA2, 329520
C47Nonndorf Obs. in Austria, 2 in MPECs 2017-X77 & 2017-X80 -- 2017 XE, 3200
J69North Obs. in England, 1 in MPEC 2017-X80 -- 2017 XE
Z80Northolt Branch Obs. in England, 1 in MPEC 2017-X80 -- 2017 XE
G34Oberfrauendorf Obs. in Germany, 3 in MPECs 2017-X77 & 2017-X80 -- 2017 XE, 2017 WL1, 17511
F51Pan-STARRS 1 (PS1) in Hawaii, 26 in MPECs 2017-X73, 2017-X74, 2017-X75, 2017-X76, 2017-X77, 2017-X78 & 2017-X79 -- 2017 XD, 2017 XC, 2017 WZ28, 2017 WY28, 2017 WX28, 2017 WL14, 2017 WL13, 2017 WA29, 2017 VM13, 2017 VK1, 2017 UC5, 2017 QQ32, 2017 QL18, 2013 QN10, 2010 SA12, 2003 YP3, 88188, 85839, 507716, 420302, 303933, 21374, 141670, 137199, 12711, 2212
D29Purple Mtn. Obs. Xuyi Station in China, 8 in MPEC 2017-X77 -- 2017 UR7, 2004 VC17, 85709, 496817, 17511, 140158, 111253, 1580
L04ROASTERR-1 in Romania, 1 in MPEC 2017-X80 -- 2017 XE
K96Savelli Obs., 1 in MPEC 2017-X77 -- 3200
204Schiaparelli Obs. in Italy, 4 in MPECs 2017-X76, 2017-X77, 2017-X80 & 2017-X81 -- 2017 XF, 2017 XE, 2017 XC, 2003 YP3
W885M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Chile Obs. in Chile, 1 in MPEC 2017-X77 -- 2015 YE18
587Sormano Obs. in Italy, 1 in MPEC 2017-X76 -- 2017 XC
691Spacewatch 0.9m telescope in Arizona, 7 in MPECs 2017-X74, 2017-X76 & 2017-X77 -- 2017 XC, 2017 WY28, 2017 VN15, 2017 UZ4, 2017 TC4, 2017 SS19, 2015 GF1
291Spacewatch 1.8m telescope in Arizona, 7 in MPECs 2017-X73, 2017-X75, 2017-X77 & 2017-X81 -- 2017 XF, 2017 WZ28, 2017 WY, 2017 WX28, 2017 WT1, 2017 WK14, 2017 WJ28
I52Steward Obs. Mt. Lemmon Station in Arizona, 21 in MPECs 2017-X77, 2017-X78, 2017-X80 & 2017-X81 -- 2017 XF, 2017 XE, 2017 WU13, 2017 WT1, 2017 WL16, 2017 WH15, 2017 WG15, 2017 WF13, 2017 WE13, 2017 WA29, 2017 VX1, 2017 VR14, 2017 VN15, 2017 VM13, 2017 VK13, 2017 VD14, 2017 VA2, 2017 UB5, 2017 TD4, 2015 XX169, 2015 XP129
926Tenagra II Obs. in Arizona, 8 in MPECs 2017-X77, 2017-X78, 2017-X79 & 2017-X80 -- 2017 XE, 2017 XD, 2017 WV12, 2017 WG16, 2017 WA29, 2017 VT12, 2017 VO15, 2017 VD14
L01Visnjan Obs., 1 in MPEC 2017-X76 -- 2017 XC
718Wiggins Obs. in Utah, 1 in MPEC 2017-X80 -- 2017 XE
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 8 December '17

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
2017 WT28NEODyS21302080-21171622.79e-03-4.47-4.530NEODyS: "Based on 19 optical observations (of which 3 are rejected as outliers) from 2017-11-28.291 to 2017-12-07.229."
2017 WE28NEODyS21302035-2115519.02e-05-4.86-5.240NEODyS: "Based on 26 optical observations (of which 8 are rejected as outliers) from 2017-11-27.127 to 2017-12-07.341."
2017 WG14NEODyS2130R E M O V E D-
2017 VW13JPL Sentry16002097-209714.762e-07-4.45-4.450JPL: Computed at 07:52 today Pacific time based on 145 observations spanning 22.685 days (2017-Nov-13.64011 to 2017-Dec-06.325543). Diameter approximately 0.250 km. from weighted mean H=20.62.
2017 VJJPL Sentry16302109-211645.3741e-07-6.35-6.690JPL: Computed at 08:00 today Pacific time based on 55 observations spanning 32.902 days (2017-Nov-05.41077 to 2017-Dec-08.31247). Diameter approximately 0.042 km. from weighted mean H=24.55.
2017 RU2NEODyS2130209311.97e-08-8.38-8.380NEODyS: "Based on 53 optical observations (of which 1 are rejected as outliers) from 2017-08-17.378 to 2017-09-21.157."

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 8 December '17

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

2240Updated Traffic Report
2130Noted that NEODyS has reposted 2017 RU2 as an impact risk - see above
Noted that NEODyS has updated its 2017 WE28 risk assessment - see above
Noted that NEODyS has removed 2017 WG14 as an impact risk - see above
Noted that NEODyS has posted 2017 WT28 as an impact risk - see above
2032Grabbed MPEC 2017-X79 - 2017 XD - see above
Grabbed MPEC 2017-X80 - 2017 XE - see above
Grabbed MPEC 2017-X81 - 2017 XF - see above
1953Grabbed MPEC 2017-X78 - 2017 WA29 - see above
1630Noted that JPL Sentry has updated its 2017 VJ risk assessment - see above
1600Noted that JPL Sentry has updated its 2017 VW13 risk assessment - see above
Grabbed MPEC 2017-X77 - Daily Orbit Update - see above
0430Grabbed MPEC 2017-X73 - 2017 WX28 - see above
Grabbed MPEC 2017-X74 - 2017 WY28 - see above
Grabbed MPEC 2017-X75 - 2017 WZ28 - see above
Grabbed MPEC 2017-X76 - 2017 XC - see above