Contents  on 17 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 17 December '17

Nine objects reported inside ten LD

There are nine asteroidal objects reported within ten lunar distances (LD) of our home world today. Nearest is newly announced 2017 XW61, which moves in from 4.41 to 3.15 LD, while 2017 VT14 comes its closest to Earth this time around, reaching 3.83 LD at 0156 UTC.

Earth passage I D ~Size Distance today  Inside ten LD Notes
2.51 LD Dec. 19 2017 XY61 19 m  5.04 from 7.89 LD yesterday - Dec. 22 NEW - MPEC
3.11 LD tomorrow 2017 XW61 27 m  3.15 from 4.41 LD Dec. 14 - 21 NEW - MPEC
3.35 LD Dec. 14 2006 XY 54 m  4.29 to 5.05 LD Dec. 5 - 23 NHATS target - DOU
3.83 LD today 2017 VT14 80 m  3.83 LD Dec. 13 - 21 radar target, Earth closest at 0156 UTC, comet nucleus?
4.51 LD Dec. 15 2017 XY2 13 m  5.51 to 6.73 LD Dec. 10 - 20 NHATS target, risk
5.16 LD tomorrow 2017 XW60 8 m  5.16 from 5.53 LD Dec. 13 - 22 DOU
6.14 LD Dec. 15 2017 XK1 31 m  7.67 to 9.57 LD Dec. 12 - 18
7.94 LD today 2017 XT60 11 m  7.94 LD Dec. 14 - 21 Earth closest at 2158 UTC
8.15 LD tomorrow 2017 XX61 16 m  8.44 from 9.93 LD yesterday - Dec. 20 NEW - MPEC
Approaching (sorted by 10-LD bubble entry date)
7.61 LD Dec. 24 2017 WZ14 31 m  10.72 from 11.52 LD tomorrow - Dec. 30 radar/NHATS target
3.7   LD Feb. 24* 2017 DR109 10 m  154.9 from 158.1 LD Feb. 18 - March 1 EPU +/- 30 mins.*, NHATS target
3.8   LD March 7* 2017 VR12 265 m  111.8 from 113.6 LD Feb. 28 - March 13 EPU +/- 15 mins.*, radar/NHATS target
* EPU = Earth passage uncertainty

This report was generated at 2022 UTC with the discoveries of three objects in the active traffic table above (2017 XY61, 2017 XX61, and 2017 XW61), and one other that has already departed. 2017 XZ61 (MPEC) flew past Earth at 3.89 LD on December 13th. Today's DOU MPEC has follow-up for inbound 2017 XW60, outbound 2006 XY, and departed objects 2017 XS and 2017 VG1.



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 17 December '17

The MPC's NEO Confirmation Page has 28 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 28 objects listed. Of these, six were "one nighters." So far The Tracking News has counted a total of 57 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 17 December '17

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been 20 MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2017-Y26 - "18:34 UT" - 2017 XV61


MPEC 2017-Y25 - "18:27 UT" - 2017 XZ61


MPEC 2017-Y24 - "18:23 UT" - 2017 XU61


MPEC 2017-Y23 - "18:20 UT" - 2017 XY61


MPEC 2017-Y22 - "18:16 UT" - 2017 XX61


MPEC 2017-Y21 - "18:14 UT" - 2017 XT61


MPEC 2017-Y20 - "18:10 UT" - 2017 XW61


MPEC 2017-Y19 - "18:07 UT" - 2017 XS61


MPEC 2017-Y18 - "18:03 UT" - 2017 XR61


MPEC 2017-Y17 - "18:00 UT" - 2017 XQ61


MPEC 2017-Y16 - "17:56 UT" - 2017 XP61


MPEC 2017-Y15 - "17:53 UT" - 2017 XO61


MPEC 2017-Y14 - "17:50 UT" - 2017 XN61


MPEC 2017-Y13 - "17:47 UT" - 2017 XM61


MPEC 2017-Y12 - "17:43 UT" - 2017 XL61


MPEC 2017-Y11 - "17:40 UT" - 2017 XK61


MPEC 2017-Y10 - "17:36 UT" - 2017 XJ61


MPEC 2017-Y09 - "17:32 UT" - 2017 XH61


MPEC 2017-Y08 - "17:29 UT" - 2017 XG61


<< DOU on 17 Dec. '17 >>  MPEC 2017-Y07 - "13:04 UT" - Daily Orbit Update

Observers  on 17 December '17

A total of 37 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 18 in MPECs 2017-Y07, 2017-Y12, 2017-Y19 & 2017-Y26 -- 2017 XV61, 2017 XT2, 2017 XS61, 2017 XL61, 2017 WX12, 2017 WT1, 2017 WS1, 2017 WH15, 2017 VM13, 2017 VL15, 2017 UG8, 2017 TK1, 2017 SO17, 2014 UR116, 2013 XM24, 21374, 10165, 8567
T05ATLAS Haleakala in Hawaii, 1 in MPEC 2017-Y09 -- 2017 XH61
T08ATLAS Mauna Loa in Hawaii, 13 in MPECs 2017-Y07 & 2017-Y25 -- 2017 XZ61, 2015 YE18, 2007 XP3, 2006 XY, 99907, 496818, 399611, 385580, 244977, 11405, 2329, 1685, 1036
160Castelmartini Obs. in Italy, 3 in MPECs 2017-Y20, 2017-Y23 & 2017-Y25 -- 2017 XZ61, 2017 XY61, 2017 XW61
703Catalina Sky Survey (CSS) in Arizona, 34 in MPECs 2017-Y07, 2017-Y15 & 2017-Y20 -- 2017 XW61, 2017 XS, 2017 XO61, 2017 WS1, 2017 UE45, 2007 XP3, 2006 XY, 1997 GC32, 68950, 53319, 53110, 505178, 504034, 496818, 411201, 338176, 294739, 285567, 209924, 17511, 16834, 164121, 159399, 142040, 141670, 140158, 137199, 136923, 11405, 100926, 7977, 2202, 1865, 1627
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 20 in MPECs 2017-Y07, 2017-Y08, 2017-Y16, 2017-Y17, 2017-Y19 & 2017-Y24 -- 2017 XU61, 2017 XS61, 2017 XQ61, 2017 XP61, 2017 XG61, 2017 XD, 2017 WU13, 2017 WU, 2017 WS1, 2017 WL1, 2017 WH14, 2017 VG1, 2017 UY4, 2017 UR51, 2017 UD45, 2017 TA4, 2017 SV20, 2017 RH15, 2017 OD1, 2017 OA
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2017-Y23 -- 2017 XY61
I48El Catalejo Obs. in Argentina, 1 in MPEC 2017-Y20 -- 2017 XW61
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 2 in MPECs 2017-Y21 & 2017-Y23 -- 2017 XY61, 2017 XT61
595Farra d'Isonzo Obs. in Italy, 3 in MPECs 2017-Y20, 2017-Y23 & 2017-Y25 -- 2017 XZ61, 2017 XY61, 2017 XW61
K88GINOP-KHK in Hungary, 5 in MPECs 2017-Y09, 2017-Y15, 2017-Y20, 2017-Y23 & 2017-Y25 -- 2017 XZ61, 2017 XY61, 2017 XW61, 2017 XO61, 2017 XH61
J95Great Shefford Obs. in England, 11 in MPECs 2017-Y07, 2017-Y12, 2017-Y14, 2017-Y19, 2017-Y20, 2017-Y21, 2017-Y22, 2017-Y23, 2017-Y24, 2017-Y25 & 2017-Y26 -- 2017 XZ61, 2017 XY61, 2017 XX61, 2017 XW61, 2017 XW60, 2017 XV61, 2017 XU61, 2017 XT61, 2017 XS61, 2017 XN61, 2017 XL61
G48Harlingten Research Obs. in New Mexico, 1 in MPEC 2017-Y25 -- 2017 XZ61
C43Hoyerswerda Obs. in Germany, 2 in MPECs 2017-Y20 & 2017-Y23 -- 2017 XY61, 2017 XW61
H15ISON New Mexico Obs. in New Mexico, 1 in MPEC 2017-Y07 -- 11405
H01Magdalena Ridge Obs. (MRO) in New Mexico, 12 in MPECs 2017-Y10, 2017-Y12, 2017-Y13, 2017-Y14, 2017-Y19, 2017-Y20, 2017-Y21, 2017-Y22, 2017-Y23, 2017-Y24, 2017-Y25 & 2017-Y26 -- 2017 XZ61, 2017 XY61, 2017 XX61, 2017 XW61, 2017 XV61, 2017 XU61, 2017 XT61, 2017 XS61, 2017 XN61, 2017 XM61, 2017 XL61, 2017 XJ61
568_Marco Micheli on Mauna Kea in Hawaii, 3 in MPECs 2017-Y08, 2017-Y16 & 2017-Y18 -- 2017 XR61, 2017 XP61, 2017 XG61
G96Mt. Lemmon Survey (MLS) in Arizona, 59 in MPECs 2017-Y07, 2017-Y10, 2017-Y12, 2017-Y13, 2017-Y14, 2017-Y15, 2017-Y17, 2017-Y18, 2017-Y19, 2017-Y21, 2017-Y22, 2017-Y23, 2017-Y24 & 2017-Y26 -- 2017 XY61, 2017 XX61, 2017 XV61, 2017 XU61, 2017 XT61, 2017 XS61, 2017 XR61, 2017 XQ61, 2017 XO61, 2017 XN61, 2017 XM61, 2017 XL61, 2017 XJ61, 2017 XG1, 2017 WY13, 2017 WP12, 2017 WP1, 2017 UC5, 2017 SE19, 2017 PS30, 2015 BF4, 2008 SP7, 2005 VP118, 2002 RN38, 2000 YG29, 96631, 505667, 504392, 503861, 497176, 495891, 438897, 415029, 354876, 350964, 331510, 27346, 265962, 253841, 248926, 242708, 232691, 210012, 174881, 162472, 162273, 162038, 159856, 152667, 152563, 142348, 140039, 137925, 136849, 136793, 9950, 8567, 5836, 3988
J69North Obs. in England, 1 in MPEC 2017-Y20 -- 2017 XW61
Z80Northolt Branch Obs. in England, 2 in MPECs 2017-Y07 & 2017-Y20 -- 2017 XW61, 3200
C27Pallerols Obs. in Spain, 1 in MPEC 2017-Y07 -- 417217
F51Pan-STARRS 1 (PS1) in Hawaii, 7 in MPECs 2017-Y07, 2017-Y08, 2017-Y11, 2017-Y16, 2017-Y17, 2017-Y18 & 2017-Y20 -- 2017 XW61, 2017 XR61, 2017 XQ61, 2017 XP61, 2017 XK61, 2017 XG61, 2008 TE157
K63Pascoli Obs. in Italy, 1 in MPEC 2017-Y23 -- 2017 XY61
204Schiaparelli Obs. in Italy, 3 in MPECs 2017-Y12, 2017-Y19 & 2017-Y20 -- 2017 XW61, 2017 XS61, 2017 XL61
033Schwarzschild Obs. in Germany, 7 in MPECs 2017-Y09, 2017-Y10, 2017-Y11, 2017-Y12, 2017-Y14, 2017-Y15 & 2017-Y16 -- 2017 XP61, 2017 XO61, 2017 XN61, 2017 XL61, 2017 XK61, 2017 XJ61, 2017 XH61
G40'program code "'" (16) via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-Y09 -- 2017 XH61
W885M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Chile Obs. in Chile, 1 in MPEC 2017-Y07 -- 2015 YE18
L06Sormano2 Obs. in Italy, 1 in MPEC 2017-Y07 -- 3200
691Spacewatch 0.9m telescope in Arizona, 8 in MPECs 2017-Y07, 2017-Y16, 2017-Y17 & 2017-Y18 -- 2017 XW2, 2017 XR61, 2017 XQ61, 2017 XP61, 2017 TC4, 228587, 138852, 138847
291Spacewatch 1.8m telescope in Arizona, 6 in MPECs 2017-Y07, 2017-Y17 & 2017-Y18 -- 2017 XS2, 2017 XR61, 2017 XQ61, 2017 UE43, 2015 OH, 2000 CK59
K21St. Saturnin les Avignon Obs. in France, 1 in MPEC 2017-Y07 -- 3200
I52Steward Obs. Mt. Lemmon Station in Arizona, 17 in MPECs 2017-Y09, 2017-Y10, 2017-Y11, 2017-Y12, 2017-Y13, 2017-Y14, 2017-Y15, 2017-Y16, 2017-Y17, 2017-Y18, 2017-Y19, 2017-Y20, 2017-Y21, 2017-Y22, 2017-Y23, 2017-Y24 & 2017-Y26 -- 2017 XY61, 2017 XX61, 2017 XW61, 2017 XV61, 2017 XU61, 2017 XT61, 2017 XS61, 2017 XR61, 2017 XQ61, 2017 XP61, 2017 XO61, 2017 XN61, 2017 XM61, 2017 XL61, 2017 XK61, 2017 XJ61, 2017 XH61
J22Tacande Obs. in the Canary Islands, 2 in MPECs 2017-Y09 & 2017-Y15 -- 2017 XO61, 2017 XH61
926Tenagra II Obs. in Arizona, 14 in MPECs 2017-Y07, 2017-Y09, 2017-Y10, 2017-Y12, 2017-Y15, 2017-Y16, 2017-Y17, 2017-Y18, 2017-Y19, 2017-Y22, 2017-Y23, 2017-Y24, 2017-Y25 & 2017-Y26 -- 2017 XZ61, 2017 XY61, 2017 XX61, 2017 XV61, 2017 XU61, 2017 XS61, 2017 XR61, 2017 XQ61, 2017 XP61, 2017 XO61, 2017 XL61, 2017 XJ61, 2017 XH61, 2015 YG
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-Y07 -- 2016 FP12
L01Visnjan Obs., 3 in MPECs 2017-Y11, 2017-Y16 & 2017-Y25 -- 2017 XZ61, 2017 XP61, 2017 XK61
I13Washington D.C. Obs. in Washington, D.C., 1 in MPEC 2017-Y07 -- 3200
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 17 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 XS2NEODyS17312104-211783.26e-05-5.56-5.660NEODyS: "Based on 13 optical observations (of which 1 are rejected as outliers) from 2017-12-11.360 to 2017-12-17.198."
JPL Sentry17302104-211463.05686e-05-5.58-5.700JPL: Computed at 09:08 today Pacific time based on 13 observations spanning 5.8381 days (2017-Dec-11.35957 to 2017-Dec-17.19765). Diameter approximately 0.019 km. from weighted mean H=26.31.
2017 UR51JPL Sentry17302061-209921.4692e-08-6.78-7.000JPL: Computed at 08:53 today Pacific time based on 44 observations spanning 46.783 days (2017-Oct-30.52142 to 2017-Dec-16.30489). Diameter approximately 0.100 km. from weighted mean H=22.57.
2017 UE43NEODyS1731211111.69e-11-10.64-10.640NEODyS: "Based on 43 optical observations (of which 5 are rejected as outliers) from 2017-10-28.365 to 2017-12-16.524."
JPL Sentry17302045-211737.9346e-08-6.95-7.020JPL: Computed at 08:52 today Pacific time based on 42 observations spanning 49.159 days (2017-Oct-28.36401 to 2017-Dec-16.52288). Diameter approximately 0.056 km. from weighted mean H=23.90.
2014 JT79JPL Sentry17302017-211611351.8872916e-06-6.23-7.460JPL: Computed at 19:19 April 6th Pacific time based on 11 observations spanning 2.8075 days (2014-May-02.40649 to 2014-May-05.21401). Diameter approximately 0.013 km. from weighted mean H=27.12.
2010 WW8JPL Sentry17302018-2112841.449862e-07-6.98-7.510JPL: Computed at 11:07 April 9th Pacific time based on 12 observations spanning .06622 days (2010-Nov-30.37333 to 2010-Nov-30.43955). Diameter approximately 0.018 km. from weighted mean H=26.38.

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 17 December '17

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

2022Generated Traffic Report
1840Grabbed MPEC 2017-Y20 - 2017 XW61 - see above
Grabbed MPEC 2017-Y21 - 2017 XT61 - see above
Grabbed MPEC 2017-Y22 - 2017 XX61 - see above
Grabbed MPEC 2017-Y23 - 2017 XY61 - see above
Grabbed MPEC 2017-Y24 - 2017 XU61 - see above
Grabbed MPEC 2017-Y25 - 2017 XZ61 - see above
Grabbed MPEC 2017-Y26 - 2017 XV61 - see above
1810Grabbed MPEC 2017-Y09 - 2017 XH61 - see above
Grabbed MPEC 2017-Y10 - 2017 XJ61 - see above
Grabbed MPEC 2017-Y11 - 2017 XK61 - see above
Grabbed MPEC 2017-Y12 - 2017 XL61 - see above
Grabbed MPEC 2017-Y13 - 2017 XM61 - see above
Grabbed MPEC 2017-Y14 - 2017 XN61 - see above
Grabbed MPEC 2017-Y15 - 2017 XO61 - see above
Grabbed MPEC 2017-Y16 - 2017 XP61 - see above
Grabbed MPEC 2017-Y17 - 2017 XQ61 - see above
Grabbed MPEC 2017-Y18 - 2017 XR61 - see above
Grabbed MPEC 2017-Y19 - 2017 XS61 - see above
1731Noted that NEODyS has updated its 2017 UE43 risk assessment - see above
Noted that NEODyS has updated its 2017 XS2 risk assessment - see above
Grabbed MPEC 2017-Y08 - 2017 XG61 - see above
1730Noted that JPL Sentry has updated its 2010 WW8 risk assessment - see above
Noted that JPL Sentry has updated its 2014 JT79 risk assessment - see above
Noted that JPL Sentry has updated its 2017 UE43 risk assessment - see above
Noted that JPL Sentry has updated its 2017 UR51 risk assessment - see above
Noted that JPL Sentry has updated its 2017 XS2 risk assessment - see above
1648Grabbed MPEC 2017-Y07 - Daily Orbit Update - see above