Contents  on 28 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 28 November '17

Fourteen objects reported inside ten LD

Fourteen transient natural objects are known to be within ten lunar distances (LD) of our planet today. Nearest is 2017 WF16, which moves in from 3.87 to 3.72 LD.

Earth passage I D ~Size Distance Today  Notes
1.74 LD Nov. 262017 WH13 16 m  4.84 to 7.29 LD
2.02 LD Nov. 252017 VY13 17 m  5.38 to 7.61 LD
2.95 LD Nov. 252017 WT12 12 m  8.12 to 11.26 LD exits ten LD
3.18 LD Nov. 242017 VZ14 32 m  7.33 to 9.06 LD
3.67 LD Dec. 22008 WM61 15 m  5.18 from 5.97 LD NHATS target
3.72 LD tomorrow2017 WF16 6 m  3.72 from 3.87 LD
4.45 LD today2017 WD28 25 m  4.45 LD NEW, Earth closest at 2123 UTC - MPEC
5.78 LD Nov. 242017 WE28 15 m  9.82 to 11.58 LD NEW, exits ten LD, risk - MPEC
6.39 LD Nov. 302017 WH2 46 m  8.43 from 11.25 LD enters ten LD - DOU
6.91 LD Nov. 252017 WZ13 18 m  9.22 to 11.02 LD exits ten LD
7.30 LD yesterday2017 WC14 25 m  7.68 to 8.77 LD DOU
7.37 LD tomorrow2017 WN15 36 m  7.41 from 8.96 LD
7.78 LD today2017 WK1 14 m  7.78 LD Earth closest at 0202 UTC
8.73 LD yesterday2017 WK15 15 m  8.80 to 9.05 LD

This report was updated at 2238 UTC with five new discoveries. Two are in the active traffic table above (2017 WE28 and 2017 WD28), and the others have already departed: 2017 WB28 (MPEC) flew by us at 6.40 LD on November 20th, 2017 WA28 (MPEC) at 8.99 LD on the 22nd, and 2017 WY27 (MPEC) at 3.65 LD on the 21st.
        Your first neighborhood flying rocks traffic report was generated at 1806 UTC with the recovery of approaching 2006 XY (MPEC), moving its Earth passage calculation from December 13th at 6.5 LD, with an uncertainty of plus-or-minus 2.43 days, to the 14th at 3.35 LD with no uncertainty, and with follow-up in today's DOU MPEC for three objects in the active traffic tables above and below (2017 WC14, 2017 WH2, 2017 VR12) and for departed 2017 VE2, plus astrometry from September for intruder 2012 TC4 and from earlier this month for 2017 WC and 444584 2006 UK. We also note the discoveries announced yesterday of two departed objects: 2017 WK16 (MPEC), which passed Earth at 7.85 LD November 22nd, and 2017 WJ16 (MPEC), which went by at about 7.7 LD on November 13th.

Approaching (sorted by 10-LD bubble entry date)
9.44 LD Dec. 52017 WS13 39 m  < 10 LD Dec. 4
3.35 LD Dec. 142006 XY 54 m  < 10 LD Dec. 5, NHATS target - MPEC
3.44 LD Dec. 92017 WV12 24 m  < 10 LD Dec. 5
9.71 LD Dec. 142015 XX169 11 m  < 10 LD Dec. 12, NHATS target
3.8   LD Dec. 172017 VT14 100 m  < 10 LD Dec. 13, uncertainty +/- 40 mins., risk, comet nucleus?
7.6   LD Dec. 242017 WZ14 31 m  < 10 LD Dec. 18, uncertainty +/- 54 mins.
3.7   LD Feb. 242017 DR109 10 m  < 10 LD Feb. 18, uncertainty +/- 30 mins., NHATS target
3.7   LD March 72017 VR12 268 m  < 10 LD Feb. 28, uncertainty +/- 1.2667 hours - DOU



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 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 28 November '17

The MPC's NEO Confirmation Page has 53 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 53 objects listed. Of these, 21 were "one nighters." So far The Tracking News has counted a total of 70 listings on the NEOCP today.

New MPECs  on 28 November '17

Minor Planet Electronic Circulars

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


MPEC 2017-W212 - "20:47 UT" - 2017 WW27


MPEC 2017-W211 - "19:18 UT" - 2017 WF28


MPEC 2017-W210 - "19:14 UT" - 2017 WE28


MPEC 2017-W209 - "19:09 UT" - 2017 WD28


MPEC 2017-W208 - "19:05 UT" - 2017 WC28


MPEC 2017-W207 - "19:00 UT" - 2017 WB28


MPEC 2017-W206 - "18:56 UT" - 2017 WA28


MPEC 2017-W205 - "18:44 UT" - 2017 WZ27


MPEC 2017-W204 - "18:39 UT" - 2017 WY27


MPEC 2017-W203 - "18:34 UT" - 2017 WX27


MPEC 2017-W202 - "14:40 UT" - 2006 XY


<< DOU on 28 Nov. '17 >>  MPEC 2017-W201 - "13:06 UT" - Daily Orbit Update

Observers  on 28 November '17

A total of 34 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 10 in MPECs 2017-W201, 2017-W203, 2017-W204, 2017-W205 & 2017-W209 -- 2017 WZ27, 2017 WY27, 2017 WX27, 2017 WN13, 2017 WM2, 2017 WF1, 2017 WD28, 2017 WB14, 2017 QL35, 2017 PS25
C77Bernezzo Obs. in Italy, 1 in MPEC 2017-W209 -- 2017 WD28
B88Bigmuskie Obs. in Italy, 1 in MPEC 2017-W201 -- 2017 VX1
160Castelmartini Obs. in Italy, 10 in MPECs 2017-W201 & 2017-W209 -- 2017 WD28, 2017 WC, 90075, 504680, 500749, 497176, 444584, 333888, 142040, 1980
703Catalina Sky Survey (CSS) in Arizona, 34 in MPECs 2017-W201, 2017-W208 & 2017-W209 -- 2017 WD28, 2017 WC28, 2017 VO15, 2017 UZ4, 2015 GF1, 2014 WG365, 2006 VW2, 2005 XB1, 2000 YG29, 1998 WP7, 87311, 86819, 53319, 506074, 505667, 497176, 497117, 496861, 496816, 438430, 307493, 27346, 265962, 209924, 185853, 16834, 162273, 162011, 154988, 142348, 138852, 136849, 9950, 8201
V06Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) in Arizona, 16 in MPECs 2017-W201, 2017-W202, 2017-W203, 2017-W204, 2017-W205, 2017-W206, 2017-W207, 2017-W208, 2017-W209, 2017-W210, 2017-W211 & 2017-W212 -- 2017 WZ27, 2017 WY27, 2017 WX27, 2017 WW27, 2017 WU13, 2017 WR15, 2017 WH2, 2017 WF28, 2017 WF15, 2017 WE28, 2017 WD28, 2017 WC28, 2017 WB28, 2017 WA28, 2017 VV14, 2006 XY
K51Celado Obs. in Italy, 5 in MPECs 2017-W204, 2017-W208, 2017-W209, 2017-W210 & 2017-W211 -- 2017 WY27, 2017 WF28, 2017 WE28, 2017 WD28, 2017 WC28
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 11 in MPEC 2017-W201 -- 2017 WQ12, 2017 WN13, 2017 WL2, 2017 WK14, 2017 WJ1, 2017 WH14, 2017 VT, 2017 VE2, 2017 UC45, 2017 UB43, 2017 SQ21
J04ESA Optical Ground Station in the Canary Islands, 1 in MPEC 2017-W201 -- 2012 TC4
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2017-W209 -- 2017 WD28
D08Ghezz Obs. in Switzerland, 1 in MPEC 2017-W201 -- 3200
203GiaGa Obs. in Italy, 1 in MPEC 2017-W209 -- 2017 WD28
K88GINOP-KHK in Hungary, 2 in MPECs 2017-W208 & 2017-W209 -- 2017 WD28, 2017 WC28
J95Great Shefford Obs. in England, 1 in MPEC 2017-W209 -- 2017 WD28
H06#M. Suzuki in Japan via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2017-W209 -- 2017 WD28
Q62(P.S. Lau in Hong Kong via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-W201 -- 5189
H01Magdalena Ridge Obs. (MRO) in New Mexico, 10 in MPECs 2017-W203, 2017-W204, 2017-W205, 2017-W206, 2017-W207, 2017-W208, 2017-W209, 2017-W210, 2017-W211 & 2017-W212 -- 2017 WZ27, 2017 WY27, 2017 WX27, 2017 WW27, 2017 WF28, 2017 WE28, 2017 WD28, 2017 WC28, 2017 WB28, 2017 WA28
C41MASTER-II Kislovodsk in Russia, 2 in MPEC 2017-W201 -- 2014 YC15, 7889
G96Mt. Lemmon Survey (MLS) in Arizona, 44 in MPECs 2017-W201, 2017-W202, 2017-W203, 2017-W204, 2017-W205, 2017-W206, 2017-W207, 2017-W208, 2017-W210, 2017-W211 & 2017-W212 -- 2017 WZ27, 2017 WY27, 2017 WY13, 2017 WX27, 2017 WX13, 2017 WW27, 2017 WS1, 2017 WF28, 2017 WE28, 2017 WC28, 2017 WB28, 2017 WA28, 2017 VX13, 2017 VS14, 2017 VE15, 2017 UH44, 2017 UE43, 2017 TQ6, 2017 OQ68, 2017 CW1, 2014 WO7, 2014 UR116, 2010 VT11, 2007 VL8, 2006 XY, 96590, 85839, 504505, 499490, 481025, 420302, 415029, 322763, 297418, 265187, 226514, 19764, 164211, 154991, 141765, 137911, 136839, 8034, 2212
Z80Northolt Branch Obs. in England, 1 in MPEC 2017-W209 -- 2017 WD28
557Ondrejov Obs. in the Czech Republic, 1 in MPEC 2017-W201 -- 3200
J43Oukaimeden Obs. in Morocco, 1 in MPEC 2017-W201 -- 495891
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2017-W201 -- 2012 GA5
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2017-W209 -- 2017 WD28
H36Sandlot Obs. in Kansas, 3 in MPECs 2017-W203, 2017-W208 & 2017-W209 -- 2017 WX27, 2017 WD28, 2017 WC28
033Schwarzschild Obs. in Germany, 1 in MPEC 2017-W208 -- 2017 WC28
587Sormano Obs. in Italy, 1 in MPEC 2017-W209 -- 2017 WD28
691Spacewatch 0.9m telescope in Arizona, 7 in MPEC 2017-W201 -- 2017 WD16, 2017 VV14, 2017 VH2, 2017 QO17, 2015 FO124, 2015 DC200, 403039
291Spacewatch 1.8m telescope in Arizona, 2 in MPEC 2017-W201 -- 2012 XS93, 2010 XC15
I52Steward Obs. Mt. Lemmon Station in Arizona, 21 in MPECs 2017-W201, 2017-W202, 2017-W204, 2017-W205, 2017-W206, 2017-W207, 2017-W208, 2017-W209, 2017-W211 & 2017-W212 -- 2017 WZ27, 2017 WY27, 2017 WY13, 2017 WY12, 2017 WW27, 2017 WR13, 2017 WQ13, 2017 WL14, 2017 WG15, 2017 WF28, 2017 WE2, 2017 WD28, 2017 WC28, 2017 WB28, 2017 WA28, 2017 WA13, 2017 VR12, 2017 VD15, 2017 RL, 2006 XY, 2005 FL4
926Tenagra II Obs. in Arizona, 11 in MPECs 2017-W201, 2017-W202, 2017-W203, 2017-W204, 2017-W205, 2017-W206, 2017-W207, 2017-W208, 2017-W209 & 2017-W210 -- 2017 WZ27, 2017 WY27, 2017 WX27, 2017 WE28, 2017 WD28, 2017 WC28, 2017 WC14, 2017 WB28, 2017 WA28, 2015 XP55, 2006 XY
W33Transit Dreams Obs., 9 in MPEC 2017-W201 -- 21374, 17511, 17182, 163696, 140158, 137062, 8037, 3200, 1865
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-W201 -- 2010 QE2
C51WISE in Earth polar orbit, 3 in MPEC 2017-W201 -- 2017 VO15, 2008 SP7, 143992
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 28 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 WE28JPL Sentry22312039-206768.2802513e-05-4.85-4.850JPL: Computed at 13:01 today Pacific time based on 24 observations spanning 1.0177 days (2017-Nov-27.12601 to 2017-Nov-28.14372). Diameter approximately 0.015 km. from weighted mean H=26.75.
2017 WY27JPL Sentry22312045-2116132.1158327e-06-7.42-8.030JPL: Computed at 13:13 today Pacific time based on 32 observations spanning 2.0049 days (2017-Nov-26.23874 to 2017-Nov-28.24368). Diameter approximately 0.009 km. from weighted mean H=27.89.
2017 VL2NEODyS16302087-2115333.71e-05-5.27-5.340NEODyS: "Based on 54 optical observations (of which 1 are rejected as outliers) from 2017-11-10.476 to 2017-11-26.347."
2017 UE43JPL Sentry16302045-211353.5724e-06-5.15-5.500JPL: Computed at 07:52 today Pacific time based on 39 observations spanning 30.051 days (2017-Oct-28.36401 to 2017-Nov-27.41469). Diameter approximately 0.056 km. from weighted mean H=23.89.

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 28 November '17

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

2238Updated Traffic Report
2231Noted that JPL Sentry has posted 2017 WE28 as an impact risk - see above
Noted that JPL Sentry has posted 2017 WY27 as an impact risk - see above
2100Grabbed MPEC 2017-W212 - 2017 WW27 - see above
1930Grabbed MPEC 2017-W207 - 2017 WB28 - see above
Grabbed MPEC 2017-W208 - 2017 WC28 - see above
Grabbed MPEC 2017-W209 - 2017 WD28 - see above
Grabbed MPEC 2017-W210 - 2017 WE28 - see above
Grabbed MPEC 2017-W211 - 2017 WF28 - see above
1900Grabbed MPEC 2017-W203 - 2017 WX27 - see above
Grabbed MPEC 2017-W204 - 2017 WY27 - see above
Grabbed MPEC 2017-W205 - 2017 WZ27 - see above
Grabbed MPEC 2017-W206 - 2017 WA28 - see above
1630Noted that JPL Sentry has updated its 2017 UE43 risk assessment - see above
Noted that NEODyS has updated its 2017 VL2 risk assessment - see above
Grabbed MPEC 2017-W201 - Daily Orbit Update - see above
Grabbed MPEC 2017-W202 - 2006 XY - see above