Contents  on 26 December '18

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 26 December '18

Six objects reported inside ten LD

Six transient natural objects are reported inside ten lunar distances (LD) of our planet today. Nearest is risk-listed 2018 XN5, which heads out from 3.44 to 4.35 LD.

Neighborhood Traffic - sorted by Earth passage distance, grouped by 1.0, 2.41, 5.0 & 10.0 LD boundaries
Earth passage I D ~Size Distance today  Inside ten LD Notes
1.60 LD Dec. 21 2018 XC4 20 m  7.71 to 9.42 LD Dec. 15 - 27 NHATS target - DOU
2.62 LD Dec. 15 2018 VO9 14 m  7.09 to 7.66 LD Nov. 29 - Dec. 31 NHATS target, risk
2.96 LD Dec. 24 2018 XN5 28 m  3.44 to 4.35 LD Dec. 18 - 31 NHATS target, risk
3.92 LD Dec. 2 2018 TG6 12 m  7.61 to 7.85 LD Oct. 30 - Jan. 5 NHATS target
5.3   LD today* 2018 XE4 17 m  5.3 LD Dec. 22 - 30 EPU +/- 3.33 hours*, Earth closest at 2036 UTC
7.36 LD Dec. 22 163899 2003 SD220 1.17 km  9.25 to 10.18 LD Dec. 17 - 26 radar/NHATS target, exits ten LD
* EPU = Earth passage uncertainty

This report was generated at 2021 UTC with follow-up in today's DOU MPEC for outbound 2018 XC4, departed 2018 XG2, and distant 68216 2001 CV26, plus new astrometry from 2014 for risk-listed intruder 2014 UU56.

Approaching - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
7.8   LD Jan. 6* 2018 XO4 30 m  12.4 from 13.1 LD Dec. 30 - Jan. 13 EPU +/- 17 mins.*, NHATS target
7.3   LD Jan. 9* 2013 YM2 19 m  15.0 from 15.8 LD Jan. 2 - 16 EPU +/- 3.75 days*, NHATS target



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 26 December '18

The MPC's NEO Confirmation Page has 11 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had eleven objects listed. Of these, four were "one nighters." So far The Tracking News has counted a total of thirteen 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 26 December '18

Minor Planet Electronic Circulars

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


MPEC 2018-Y74 - "17:43 UT" - Comet 46P/Wirtanen


<< DOU on 26 Dec. '18 >>  MPEC 2018-Y73 - "13:07 UT" - Daily Orbit Update


MPEC 2018-Y72 - "12:27 UT" - 2014 PT59


MPEC 2018-Y71 - "02:29 UT" - Comet C/2018 W2 (Africano)


MPEC 2018-Y70 - "02:24 UT" - Comet C/2018 X2 (Fitzsimmons)


MPEC 2018-Y69 - "02:16 UT" - Comet C/2018 Y1 (Iwamoto)

Observers  on 26 December '18

A total of 114 observers appear in today's MPECs.

CodeObserver / observatory
L2729PREMOTE Obs., 1 in MPEC 2018-Y74 -- 46P
349Ageo Obs. in Japan, 4 in MPECs 2018-Y69, 2018-Y70, 2018-Y71 & 2018-Y74 -- C/2018 Y1, C/2018 X2, C/2018 W2, 46P
L17Albanya Obs., 1 in MPEC 2018-Y74 -- 46P
J24Altamira Obs. in the Canary Islands, 1 in MPEC 2018-Y74 -- 46P
H21Astronomical Research Obs. Westfield in Illinois, 1 in MPEC 2018-Y73 -- 2017 SB14
T05ATLAS Haleakala in Hawaii, 1 in MPEC 2018-Y74 -- 46P
T08ATLAS Mauna Loa in Hawaii, 1 in MPEC 2018-Y74 -- 46P
I47Auger Obs. in Argentina, 1 in MPEC 2018-Y69 -- C/2018 Y1
C77Bernezzo Obs. in Italy, 1 in MPEC 2018-Y74 -- 46P
C86Blanes Obs. in Spain, 1 in MPEC 2018-Y74 -- 46P
Q68Blue Mountains Obs. in New South Wales, 1 in MPEC 2018-Y74 -- 46P
B96Brixiis Obs. in Belgium, 1 in MPEC 2018-Y74 -- 46P
215Buchloe Obs. in Germany, 1 in MPEC 2018-Y74 -- 46P
W96Campo Catino Austral Obs. (CAO) in Chile, 2 in MPECs 2018-Y69 & 2018-Y74 -- C/2018 Y1, 46P
B53Casal Lumbroso Obs. in Italy, 1 in MPEC 2018-Y74 -- 46P
160Castelmartini Obs. in Italy, 6 in MPECs 2018-Y73 & 2018-Y74 -- 2012 MM11, 31210, 141053, 7358, 5131, 46P
703Catalina Sky Survey in Arizona, 1 in MPEC 2018-Y71 -- C/2018 W2
107Cavezzo Obs. in Italy, 1 in MPEC 2018-Y74 -- 46P
K51Celado Obs. in Italy, 1 in MPEC 2018-Y74 -- 46P
A77Chante-Perdrix Obs. in France, 2 in MPECs 2018-Y69 & 2018-Y74 -- C/2018 Y1, 46P
970Chelmsford Obs. in England, 3 in MPECs 2018-Y69, 2018-Y71 & 2018-Y74 -- C/2018 Y1, C/2018 W2, 46P
B92Chinon Obs. in France, 1 in MPEC 2018-Y74 -- 46P
J01Cielo Profundo Obs. in Spain, 1 in MPEC 2018-Y74 -- 46P
850Cordell-Lorenz Obs. in Tennessee, 2 in MPECs 2018-Y71 & 2018-Y74 -- C/2018 W2, 46P
Z45Cosmos Obs., 1 in MPEC 2018-Y74 -- 46P
Z39Costa Teguise Obs. in the Canary Islands, 1 in MPEC 2018-Y74 -- 46P
958Dax Obs. in France, 1 in MPEC 2018-Y74 -- 46P
W84%program code "%" (14) via DECam in Chile, 1 in MPEC 2018-Y73 -- 2014 UU56
G37Discovery Channel Telescope in Arizona, 1 in MPEC 2018-Y74 -- 46P
L05Dridri Obs. in Italy, 1 in MPEC 2018-Y74 -- 46P
K02Eastwood Obs. in England, 1 in MPEC 2018-Y74 -- 46P
J04ESA Optical Ground Station in the Canary Islands, 1 in MPEC 2018-Y71 -- C/2018 W2
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2018-Y70 -- C/2018 X2
F652Lothar Kurtze in Germany via Faulkes Telescope North in Hawaii, 1 in MPEC 2018-Y74 -- 46P
E10*program code "*" (19) via Faulkes Telescope South in New South Wales, 2 in MPECs 2018-Y73 & 2018-Y74 -- 2018 XB2, 46P
K83Forti Obs., 1 in MPEC 2018-Y74 -- 46P
157Frasso Sabino Obs. in Italy, 1 in MPEC 2018-Y71 -- C/2018 W2
K97Freconrupt Obs., 1 in MPEC 2018-Y74 -- 46P
G26Fushan Obs. in China, 1 in MPEC 2018-Y74 -- 46P
372Geisei Obs. in Japan, 1 in MPEC 2018-Y74 -- 46P
E89Geyserland Obs. in New Zealand, 3 in MPECs 2018-Y73 & 2018-Y74 -- 88263, 1627, 46P
K73Gravina Obs. in Italy, 1 in MPEC 2018-Y74 -- 46P
458Guadarrama Obs. in Spain, 1 in MPEC 2018-Y74 -- 46P
D88Hiratsuka Obs. in Japan, 1 in MPEC 2018-Y74 -- 46P
750Hobbs Obs. in Wisconsin, 1 in MPEC 2018-Y74 -- 46P
C43Hoyerswerda Obs. in Germany, 1 in MPEC 2018-Y74 -- 46P
U695Hidetaka Sato in Japan via iTelescope Obs. Auberry in northern California, 1 in MPEC 2018-Y71 -- C/2018 W2
U69_program code "_" (29) via iTelescope Obs. Auberry in northern California, 2 in MPECs 2018-Y71 & 2018-Y74 -- C/2018 W2, 46P
H06iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2018-Y69 -- C/2018 Y1
H06`Erik Bryssinck in Belgium via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2018-Y74 -- 46P
Q62iTelescope Obs. Siding Spring in New South Wales, 2 in MPECs 2018-Y69 & 2018-Y74 -- C/2018 Y1, 46P
Q621Hidetaka Sato in Japan via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-Y74 -- 46P
Q623Rolando Ligustri in Italy via iTelescope Obs. Siding Spring in New South Wales, 2 in MPECs 2018-Y69 & 2018-Y74 -- C/2018 Y1, 46P
Q62?B. Lutkenhoner in Germany via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-Y69 -- C/2018 Y1
Q62`Steven M. Tilley in Louisiana via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-Y74 -- 46P
Q62{Nirmal Paul in India via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-Y74 -- 46P
Q67JBL Obs., 1 in MPEC 2018-Y74 -- 46P
403Kani Obs. in Japan, 1 in MPEC 2018-Y69 -- C/2018 Y1
L12Koksijde Obs., 1 in MPEC 2018-Y74 -- 46P
D95Kurihara Obs. in Japan, 2 in MPECs 2018-Y69 & 2018-Y74 -- C/2018 Y1, 46P
212La Dehesilla Obs. in Spain, 1 in MPEC 2018-Y74 -- 46P
809La Silla in Chile, 1 in MPEC 2018-Y74 -- 46P
J38La Vara Obs. in Spain, 1 in MPEC 2018-Y74 -- 46P
W87LCO Cerro Tololo C in Chile, 1 in MPEC 2018-Y74 -- 46P
Q58LCO Siding Spring Clamshell#1 in New South Wales, 1 in MPEC 2018-Y74 -- 46P
L09LCO Sutherland Aqawan A#1 in South Africa, 1 in MPEC 2018-Y74 -- 46P
Z21LCO Tenerife Aqawan A#1 in the Canary Islands, 1 in MPEC 2018-Y74 -- 46P
K08Lledoner Obs., 1 in MPEC 2018-Y74 -- 46P
844Los Molinos Obs. in Uruguay, 1 in MPEC 2018-Y74 -- 46P
688'program code "'" (16) via Lowell Obs. Anderson Mesa Station in Arizona, 1 in MPEC 2018-Y74 -- 46P
K38M57 Obs. in Italy, 1 in MPEC 2018-Y74 -- 46P
A06Mataro Obs. in Spain, 1 in MPEC 2018-Y74 -- 46P
Z50Mazariegos Obs., 1 in MPEC 2018-Y74 -- 46P
213Montcabre Obs. in Spain, 2 in MPECs 2018-Y71 & 2018-Y74 -- C/2018 W2, 46P
108Montelupo Obs. in Italy, 1 in MPEC 2018-Y74 -- 46P
K74Muensterschwarzach Obs. in Germany, 1 in MPEC 2018-Y74 -- 46P
D74Nakagawa Obs., 1 in MPEC 2018-Y69 -- C/2018 Y1
C53NEOSSat in Earth orbit, 1 in MPEC 2018-Y74 -- 46P
C47Nonndorf Obs. in Austria, 1 in MPEC 2018-Y74 -- 46P
423North Ryde Obs. in New South Wales, 1 in MPEC 2018-Y74 -- 46P
Z80Northolt Branch Obs. in England, 1 in MPEC 2018-Y74 -- 46P
C23Olmen Obs. in Belgium, 5 in MPECs 2018-Y73 & 2018-Y74 -- 2007 YQ56, 2004 XP14, 2003 NW1, 418849, 46P
I61Ourense Obs. in Spain, 1 in MPEC 2018-Y74 -- 46P
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2018-Y73 -- 2017 OL68
K63Pascoli Obs. in Italy, 1 in MPEC 2018-Y74 -- 46P
323Perth Obs. in Western Australia, 1 in MPEC 2018-Y74 -- 46P
H45Petit Jean Mtn. South Obs. in Arkansas, 1 in MPEC 2018-Y74 -- 46P
K81PMPHR Obs., 1 in MPEC 2018-Y74 -- 46P
J53Posadas Obs. in Spain, 1 in MPEC 2018-Y74 -- 46P
G39ROAD in Chile, 1 in MPEC 2018-Y74 -- 46P
L04ROASTERR-1 in Romania, 1 in MPEC 2018-Y74 -- 46P
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2018-Y74 -- 46P
233San Vito Obs. in Italy, 2 in MPECs 2018-Y73 & 2018-Y74 -- 68216, 46P
B74Santa Maria de Montmagastrell Obs. in Spain, 1 in MPEC 2018-Y74 -- 46P
C95SATINO-1 in France, 3 in MPECs 2018-Y69, 2018-Y73 & 2018-Y74 -- C/2018 Y1, 2018 XG2, 46P
K14Sencelles Obs. in Spain, 1 in MPEC 2018-Y74 -- 46P
Q11Shinshiro Obs., 2 in MPECs 2018-Y71 & 2018-Y74 -- C/2018 W2, 46P
G40!M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Canary Islands Obs. in the Canary Islands, 3 in MPEC 2018-Y73 -- 2018 XC4, 2018 WR1, 2018 WA2
G40'program code "'" (16) via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-Y74 -- 46P
G40(program code "(" (17) via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-Y73 -- 2018 VN3
G40)program code ")" (18) via Slooh.com Canary Islands Obs. in the Canary Islands, 2 in MPEC 2018-Y73 -- 522684, 444193
G402program code 2 via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-Y74 -- 46P
G409B. Lutkenhoner in Germany via Slooh.com Canary Islands Obs. in the Canary Islands, 2 in MPECs 2018-Y69 & 2018-Y74 -- C/2018 Y1, 46P
W88!program code "!" (10) via Slooh.com Chile Obs. in Chile, 1 in MPEC 2018-Y74 -- 46P
W88"program code '"' (11) via Slooh.com Chile Obs. in Chile, 1 in MPEC 2018-Y73 -- 2017 XD
W88$program code "$" (13) via Slooh.com Chile Obs. in Chile, 1 in MPEC 2018-Y69 -- C/2018 Y1
W88%program code "%" (14) via Slooh.com Chile Obs. in Chile, 1 in MPEC 2018-Y74 -- 46P
W883B. Lutkenhoner in Germany via Slooh.com Chile Obs. in Chile, 1 in MPEC 2018-Y69 -- C/2018 Y1
W885M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Chile Obs. in Chile, 1 in MPEC 2018-Y73 -- 2018 VB9
587Sormano Obs. in Italy, 1 in MPEC 2018-Y74 -- 46P
L06Sormano2 Obs. in Italy, 1 in MPEC 2018-Y71 -- C/2018 W2
Q21Southern Utsunomiya in Japan, 1 in MPEC 2018-Y74 -- 46P
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2018-Y74 -- 46P
K21St. Saturnin les Avignon Obs. in France, 1 in MPEC 2018-Y74 -- 46P
C36Starry Wanderer Obs. in Belarus, 1 in MPEC 2018-Y74 -- 46P
Q23Sukagawa Obs., 1 in MPEC 2018-Y74 -- 46P
Q38Swan Hill Obs., 1 in MPEC 2018-Y74 -- 46P
461SZTE Asteroid Program in Hungary, 1 in MPEC 2018-Y71 -- C/2018 W2
J22Tacande Obs. in the Canary Islands, 1 in MPEC 2018-Y69 -- C/2018 Y1
I81Tarbatness Obs. in Scotland, 2 in MPECs 2018-Y71 & 2018-Y74 -- C/2018 W2, 46P
A16Tentlingen Obs. in Switzerland, 1 in MPEC 2018-Y73 -- 3552
C35Terrassa Obs. in Spain, 1 in MPEC 2018-Y74 -- 46P
W33Transit Dreams Obs., 1 in MPEC 2018-Y74 -- 46P
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPECs 2018-Y72 & 2018-Y74 -- 2014 PT59, 46P
Z55Uraniborg Obs., 1 in MPEC 2018-Y74 -- 46P
K17Valentines Obs., 1 in MPEC 2018-Y74 -- 46P
H47Vicksburg Obs. in Mississippi, 1 in MPEC 2018-Y74 -- 46P
L01Visnjan Obs., 1 in MPEC 2018-Y73 -- 523815
Z92West Park Obs. in England, 1 in MPEC 2018-Y74 -- 46P
C51WISE in Earth polar orbit, 2 in MPEC 2018-Y73 -- 410088, 153219
367Yatsuka Obs. in Japan, 1 in MPEC 2018-Y69 -- C/2018 Y1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 26 December '18

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 and NEODyS listings is 100 years, and both post impact solutions beyond that for some 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
2014 UU56NEODyS17302051-209662.14e-08-9.55-9.70NEODyS: "Based on 22 optical observations (of which 0 are rejected as outliers) from 2014-10-21.224 to 2014-10-28.458."

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 26 December '18

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

2021Generated Traffic Report
1803Grabbed MPEC 2018-Y74 - Comet 46P/Wirtanen - see above
1730Noted that NEODyS has updated its 2014 UU56 risk assessment - see above
Grabbed MPEC 2018-Y72 - 2014 PT59 - see above
Grabbed MPEC 2018-Y73 - Daily Orbit Update - see above
0608Grabbed MPEC 2018-Y69 - Comet C/2018 Y1 (Iwamoto) - see above
Grabbed MPEC 2018-Y70 - Comet C/2018 X2 (Fitzsimmons) - see above
Grabbed MPEC 2018-Y71 - Comet C/2018 W2 (Africano) - see above