Contents  on 23 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 23 December '17

Three objects reported inside ten LD

Bulletin - 2040, updated 2135, 2204 & 2358 UTC:  Ten new discoveries of close passers have been announced. These will be added to the next traffic report after we finish obtaining and processing further details.

Earth passageI D~SizeInside ten LD approx.Notes
1.04 LD at 0355 Dec. 182017 YJ110 m Dec. 13 - 23Moon closest 0.55 LD Dec. 17 - MPEC
1.52 LD at 1239 Dec. 152017 YM128 m Dec. 11 - 20risk - MPEC
1.77 LD at 2254 Dec. 152017 YD13 m Nov. 30 - Dec. 31risk - MPEC
2.38 LD at 0027 Dec. 182017 YH1195 m Dec. 14 - 21MPEC
5.13 LD at 1326 Dec. 262017 YQ143 m tomorrow - Dec. 29MPEC
5.65 LD at 1420 Dec. 202017 YP125 m Dec. 17 - 24MPEC
7.66 LD at 1223 Dec. 182017 YL137 m Dec. 16 - 21MPEC
7.90 LD at 1907 yesterday2017 YW15 m Dec. 19 - 26MPEC
8.37 LD at 0154 Dec. 202017 YN120 m Dec. 16 - 23MPEC
9.31 LD at 0607 Dec. 112017 YB114 m Dec. 9 - 13MPEC


Three transient natural objects are known to be inside ten lunar distances (LD) of Earth today. Nearest is 2017 YE, which moves outward from 2.96 to 3.36 LD.

Earth passage I D ~Size Distance today  Inside ten LD Notes
2.88 LD yesterday 2017 YE 7 m  2.96 to 3.36 LD Dec. 13 - 31 NHATS target
3.35 LD Dec. 14 2006 XY 54 m  9.79 to 10.81 LD Dec. 5 - 23 NHATS target, exits ten LD - DOU
7.62 LD tomorrow 2017 WZ14 32 m  7.68 from 7.89 LD Dec. 18 - 30 radar/NHATS target - DOU
Approaching (sorted by 10-LD bubble entry date)
3.7   LD Feb. 24* 2017 DR109 10 m  136.4 from 139.4 LD Feb. 18 - March 1 EPU +/- 30 mins.*, NHATS target
3.8   LD March 7* 2017 VR12 267 m  101.3 from 103.0 LD Feb. 28 - March 13 EPU +/- 9 mins.*, radar/NHATS target
* EPU = Earth passage uncertainty

This report was generated at 1904 UTC with follow-up in today's DOU MPEC for inbound 2017 WZ14, outbound 2006 XY, and departed objects 2017 XT60, 2017 XS, and 2017 VT14, plus astrometry from earlier this month for 2017 WV12 and from November for 2017 WB.



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 23 December '17

The MPC's NEO Confirmation Page has 71 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 71 objects listed. Of these, 51 were "one nighters." So far The Tracking News has counted a total of 108 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 23 December '17

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been 22 MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2017-Y73 - "21:32 UT" - 2017 YM1


MPEC 2017-Y72 - "21:28 UT" - 2017 YL1


MPEC 2017-Y71 - "21:24 UT" - 2017 YJ1


MPEC 2017-Y70 - "21:21 UT" - 2017 YH1


MPEC 2017-Y69 - "21:12 UT" - 2017 YY


MPEC 2017-Y68 - "21:09 UT" - 2017 YW


MPEC 2017-Y67 - "21:05 UT" - 2017 YQ1


MPEC 2017-Y66 - "21:01 UT" - 2017 YP1


MPEC 2017-Y65 - "20:58 UT" - 2017 YO1


MPEC 2017-Y64 - "20:54 UT" - 2017 YN1


MPEC 2017-Y63 - "20:51 UT" - 2017 YK1


MPEC 2017-Y62 - "20:47 UT" - 2017 YG1


MPEC 2017-Y61 - "20:44 UT" - 2017 YF1


MPEC 2017-Y60 - "20:41 UT" - 2017 YE1


MPEC 2017-Y59 - "20:37 UT" - 2017 YD1


MPEC 2017-Y58 - "20:33 UT" - 2017 YC1


MPEC 2017-Y57 - "20:29 UT" - 2017 YB1


MPEC 2017-Y56 - "20:24 UT" - 2017 YA1


MPEC 2017-Y55 - "20:21 UT" - 2017 YZ


MPEC 2017-Y54 - "20:17 UT" - 2017 YX


MPEC 2017-Y53 - "17:15 UT" - 2017 YV


<< DOU on 23 Dec. '17 >>  MPEC 2017-Y52 - "13:03 UT" - Daily Orbit Update

Observers  on 23 December '17

A total of 44 observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2017-Y67 -- 2017 YQ1
H21Astronomical Research Obs. Westfield in Illinois, 19 in MPECs 2017-Y52, 2017-Y56 & 2017-Y70 -- 2017 YH1, 2017 YA1, 2017 WY13, 2017 WX12, 2017 WB, 2017 VX14, 2017 VX1, 2017 VU, 2017 VS12, 2017 VM2, 2017 TR1, 2017 TC4, 2017 SP19, 2017 QL18, 2017 NL6, 88188, 174881, 162004, 1865
T08ATLAS Mauna Loa in Hawaii, 1 in MPEC 2017-Y70 -- 2017 YH1
C77Bernezzo Obs. in Italy, 1 in MPEC 2017-Y70 -- 2017 YH1
073Bucharest Obs. in Romania, 1 in MPEC 2017-Y52 -- 418849
Z84Calar Alto Schmidt in Spain, 2 in MPECs 2017-Y60 & 2017-Y62 -- 2017 YG1, 2017 YE1
160Castelmartini Obs. in Italy, 4 in MPECs 2017-Y53, 2017-Y60, 2017-Y61 & 2017-Y70 -- 2017 YV, 2017 YH1, 2017 YF1, 2017 YE1
703Catalina Sky Survey (CSS) in Arizona, 29 in MPECs 2017-Y52, 2017-Y53, 2017-Y61, 2017-Y62, 2017-Y70, 2017-Y71, 2017-Y72 & 2017-Y73 -- 2017 YV, 2017 YM1, 2017 YL1, 2017 YJ1, 2017 YH1, 2017 YG1, 2017 YF1, 2017 QJ18, 2007 XP3, 96189, 90075, 53319, 53110, 505667, 497176, 438897, 415029, 333888, 294739, 27346, 162998, 162004, 154589, 153201, 142348, 136849, 9950, 8567, 1627
V06Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) in Arizona, 30 in MPECs 2017-Y52, 2017-Y53, 2017-Y54, 2017-Y55, 2017-Y56, 2017-Y57, 2017-Y59, 2017-Y60, 2017-Y61, 2017-Y62, 2017-Y63, 2017-Y64, 2017-Y65, 2017-Y66, 2017-Y67, 2017-Y68, 2017-Y69, 2017-Y70, 2017-Y71 & 2017-Y72 -- 2017 YZ, 2017 YY, 2017 YX, 2017 YW, 2017 YV, 2017 YQ1, 2017 YP1, 2017 YO1, 2017 YN1, 2017 YL1, 2017 YK1, 2017 YJ1, 2017 YH1, 2017 YG1, 2017 YF1, 2017 YE1, 2017 YD1, 2017 YB1, 2017 YA1, 2017 XW2, 2017 XV60, 2017 XJ62, 2017 XJ2, 2017 XH1, 2017 XB2, 2017 XA62, 2017 XA2, 2017 WZ14, 2015 JA2, 2015 BR514
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 10 in MPECs 2017-Y52, 2017-Y59, 2017-Y66 & 2017-Y67 -- 2017 YQ1, 2017 YP1, 2017 YD1, 2017 YD, 2017 XS61, 2017 WS1, 2017 WL1, 2017 WG1, 2017 VU13, 2017 UQ4
A77Chante-Perdrix Obs. in France, 3 in MPECs 2017-Y53, 2017-Y70 & 2017-Y72 -- 2017 YV, 2017 YL1, 2017 YH1
J27El Guijo Obs. in Spain, 4 in MPEC 2017-Y52 -- 189173, 17511, 17182, 2368
595Farra d'Isonzo Obs. in Italy, 5 in MPECs 2017-Y53, 2017-Y60, 2017-Y64, 2017-Y70 & 2017-Y72 -- 2017 YV, 2017 YN1, 2017 YL1, 2017 YH1, 2017 YE1
203GiaGa Obs. in Italy, 4 in MPECs 2017-Y53, 2017-Y60, 2017-Y64 & 2017-Y70 -- 2017 YV, 2017 YN1, 2017 YH1, 2017 YE1
K88GINOP-KHK in Hungary, 3 in MPECs 2017-Y53, 2017-Y70 & 2017-Y72 -- 2017 YV, 2017 YL1, 2017 YH1
G48Harlingten Research Obs. in New Mexico, 1 in MPEC 2017-Y70 -- 2017 YH1
511Haute Provence Obs. in Germany, 1 in MPEC 2017-Y52 -- 3200
H15ISON New Mexico Obs. in New Mexico, 1 in MPEC 2017-Y52 -- 2368
U691Ernesto Guido in Italy via iTelescope Obs. Auberry in northern California, 1 in MPEC 2017-Y70 -- 2017 YH1
H06iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2017-Y70 -- 2017 YH1
H06#M. Suzuki in Japan via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2017-Y70 -- 2017 YH1
H06|Hidetaka Sato in Japan via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2017-Y70 -- 2017 YH1
P93JAXA Space Tracking & Communications Center in Japan, 1 in MPEC 2017-Y70 -- 2017 YH1
K38M57 Obs. in Italy, 1 in MPEC 2017-Y70 -- 2017 YH1
K32Maritime Alps Obs. in Italy, 1 in MPEC 2017-Y70 -- 2017 YH1
C94MASTER-II Tunka in Russia, 1 in MPEC 2017-Y52 -- 17511
711McDonald Obs. in Texas, 5 in MPECs 2017-Y53, 2017-Y60, 2017-Y61, 2017-Y64 & 2017-Y70 -- 2017 YV, 2017 YN1, 2017 YH1, 2017 YF1, 2017 YE1
G96Mt. Lemmon Survey (MLS) in Arizona, 39 in MPECs 2017-Y52, 2017-Y54, 2017-Y55, 2017-Y56, 2017-Y57, 2017-Y58, 2017-Y59, 2017-Y60, 2017-Y63, 2017-Y64, 2017-Y65, 2017-Y66, 2017-Y67, 2017-Y68 & 2017-Y69 -- 2017 YZ, 2017 YY, 2017 YX, 2017 YW, 2017 YQ1, 2017 YP1, 2017 YO1, 2017 YN1, 2017 YK1, 2017 YE1, 2017 YD1, 2017 YC1, 2017 YB1, 2017 YA1, 2017 XS, 2017 WG2, 2016 YW7, 2013 QH48, 2012 VZ36, 2004 BB, 96189, 85709, 504034, 496818, 494975, 420210, 368664, 345853, 294739, 285567, 243566, 192563, 17181, 163691, 15817, 142464, 142040, 140158, 137199
J43Oukaimeden Obs. in Morocco, 11 in MPEC 2017-Y52 -- 2017 XD62, 2014 QW296, 88264, 68278, 506859, 504887, 438430, 415029, 381906, 162011, 136839
F51Pan-STARRS 1 (PS1) in Hawaii, 4 in MPECs 2017-Y52, 2017-Y60, 2017-Y61 & 2017-Y65 -- 2017 YO1, 2017 YF1, 2017 YE1, 2017 XK60
K63Pascoli Obs. in Italy, 3 in MPECs 2017-Y53, 2017-Y60 & 2017-Y70 -- 2017 YV, 2017 YH1, 2017 YE1
B49Paus Obs. in Spain, 1 in MPEC 2017-Y70 -- 2017 YH1
6581Dave Balam via Plaskett 1.8m Telescope in British Columbia, 3 in MPECs 2017-Y53, 2017-Y61 & 2017-Y62 -- 2017 YV, 2017 YG1, 2017 YF1
L04ROASTERR-1 in Romania, 1 in MPEC 2017-Y70 -- 2017 YH1
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2017-Y70 -- 2017 YH1
H36Sandlot Obs. in Kansas, 3 in MPECs 2017-Y53, 2017-Y70 & 2017-Y72 -- 2017 YV, 2017 YL1, 2017 YH1
204Schiaparelli Obs. in Italy, 25 in MPECs 2017-Y52, 2017-Y53, 2017-Y54, 2017-Y60, 2017-Y61, 2017-Y62, 2017-Y63, 2017-Y68, 2017-Y70 & 2017-Y72 -- 2017 YX, 2017 YW, 2017 YV, 2017 YL1, 2017 YK1, 2017 YH1, 2017 YG1, 2017 YF1, 2017 YE1, 2017 XT60, 2017 XB1, 2017 WX12, 2017 WV13, 2017 WV12, 2017 WL1, 2017 WG2, 2017 QL33, 2017 PS30, 2016 AU8, 2014 JC31, 2008 AX28, 2006 XY, 2004 VC17, 504680, 496818
G40!M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-Y52 -- 302311
G409B. Lutkenhoner in Germany via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-Y70 -- 2017 YH1
691Spacewatch 0.9m telescope in Arizona, 8 in MPECs 2017-Y52, 2017-Y58, 2017-Y60 & 2017-Y65 -- 2017 YO1, 2017 YE1, 2017 YC1, 2017 XB1, 2017 UZ4, 2017 SV20, 499490, 234145
291Spacewatch 1.8m telescope in Arizona, 10 in MPECs 2017-Y52, 2017-Y54, 2017-Y55, 2017-Y57 & 2017-Y59 -- 2017 YZ, 2017 YX, 2017 YD1, 2017 YB1, 2017 WF1, 2017 VT14, 2017 VO15, 2017 VE15, 2017 UR4, 2015 CV13
I52Steward Obs. Mt. Lemmon Station in Arizona, 20 in MPECs 2017-Y53, 2017-Y54, 2017-Y55, 2017-Y56, 2017-Y58, 2017-Y59, 2017-Y60, 2017-Y61, 2017-Y62, 2017-Y63, 2017-Y64, 2017-Y65, 2017-Y66, 2017-Y67, 2017-Y68, 2017-Y69, 2017-Y70, 2017-Y71, 2017-Y72 & 2017-Y73 -- 2017 YZ, 2017 YY, 2017 YX, 2017 YW, 2017 YV, 2017 YQ1, 2017 YP1, 2017 YO1, 2017 YN1, 2017 YM1, 2017 YL1, 2017 YK1, 2017 YJ1, 2017 YH1, 2017 YG1, 2017 YF1, 2017 YE1, 2017 YD1, 2017 YC1, 2017 YA1
926Tenagra II Obs. in Arizona, 18 in MPECs 2017-Y52, 2017-Y53, 2017-Y54, 2017-Y55, 2017-Y58, 2017-Y59, 2017-Y60, 2017-Y61, 2017-Y62, 2017-Y63, 2017-Y64, 2017-Y65, 2017-Y67, 2017-Y68, 2017-Y69, 2017-Y71, 2017-Y72 & 2017-Y73 -- 2017 YZ, 2017 YY, 2017 YX, 2017 YW, 2017 YV, 2017 YQ1, 2017 YO1, 2017 YN1, 2017 YM1, 2017 YL1, 2017 YK1, 2017 YJ1, 2017 YG1, 2017 YF1, 2017 YE1, 2017 YD1, 2017 YC1, 2017 WZ14
T14UH/Tholen NEO Follow-Up CFH Telescope in Hawaii, 2 in MPEC 2017-Y52 -- 2017 XS2, 2017 WC15
L01Visnjan Obs., 3 in MPECs 2017-Y53, 2017-Y72 & 2017-Y73 -- 2017 YV, 2017 YM1, 2017 YL1
718Wiggins Obs. in Utah, 1 in MPEC 2017-Y70 -- 2017 YH1
C51WISE in Earth polar orbit, 2 in MPEC 2017-Y52 -- 333888, 1036
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 23 December '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 YM1JPL Sentry23582048-2103223.3728731e-05-4.84-5.120JPL: Computed at 15:55 today Pacific time based on 18 observations spanning 1.7198 days (2017-Dec-20.40891 to 2017-Dec-22.128697). Diameter approximately 0.028 km. from weighted mean H=25.41.
2017 YD1JPL Sentry23242102-211724.474e-06-8.24-8.340JPL: Computed at 15:07 today Pacific time based on 26 observations spanning 3.0018 days (2017-Dec-20.24585 to 2017-Dec-23.24769). Diameter approximately 0.003 km. from weighted mean H=30.00.
2017 XS2NEODyS1850211716.22e-08-8.20-8.20NEODyS: "Based on 27 optical observations (of which 3 are rejected as outliers) from 2017-12-11.360 to 2017-12-23.342."
JPL Sentry16462104-210423.0214e-08-8.46-8.620JPL: Computed at 08:05 today Pacific time based on 27 observations spanning 11.981 days (2017-Dec-11.35957 to 2017-Dec-23.340932). Diameter approximately 0.021 km. from weighted mean H=26.05.
2017 WC15JPL Sentry1646R E M O V E DJPL: Risk listing removed at 1553 UTC today

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 23 December '17

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

2358Noted that JPL Sentry has posted 2017 YM1 as an impact risk - see above
2324Noted that JPL Sentry has posted 2017 YD1 as an impact risk - see above
2203Grabbed MPEC 2017-Y73 - 2017 YM1 - see above
2131Grabbed MPEC 2017-Y60 - 2017 YE1 - see above
Grabbed MPEC 2017-Y61 - 2017 YF1 - see above
Grabbed MPEC 2017-Y62 - 2017 YG1 - see above
Grabbed MPEC 2017-Y63 - 2017 YK1 - see above
Grabbed MPEC 2017-Y64 - 2017 YN1 - see above
Grabbed MPEC 2017-Y65 - 2017 YO1 - see above
Grabbed MPEC 2017-Y66 - 2017 YP1 - see above
Grabbed MPEC 2017-Y67 - 2017 YQ1 - see above
Grabbed MPEC 2017-Y68 - 2017 YW - see above
Grabbed MPEC 2017-Y69 - 2017 YY - see above
Grabbed MPEC 2017-Y70 - 2017 YH1 - see above
Grabbed MPEC 2017-Y71 - 2017 YJ1 - see above
Grabbed MPEC 2017-Y72 - 2017 YL1 - see above
2038Grabbed MPEC 2017-Y53 - 2017 YV - see above
Grabbed MPEC 2017-Y54 - 2017 YX - see above
Grabbed MPEC 2017-Y55 - 2017 YZ - see above
Grabbed MPEC 2017-Y56 - 2017 YA1 - see above
Grabbed MPEC 2017-Y57 - 2017 YB1 - see above
Grabbed MPEC 2017-Y58 - 2017 YC1 - see above
Grabbed MPEC 2017-Y59 - 2017 YD1 - see above
1904Generated Traffic Report
1850Noted that NEODyS has updated its 2017 XS2 risk assessment - see above
1646Noted that JPL Sentry has removed 2017 WC15 as an impact risk - see above
Noted that JPL Sentry has updated its 2017 XS2 risk assessment - see above
Grabbed MPEC 2017-Y52 - Daily Orbit Update - see above