Contents  on 23 April '13

Asteroid/Comet Connection (A/CC) Resources:

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Traffic Report  on 23 April '13

Two objects reported inside ten LD

There are two asteroids reported within ten lunar distances (LD) of Earth today. 2013 GH66 is outbound from 5.47 to 5.80 LD and 2013 GH23 departs from inside ten LD, moving from 9.79 to 11.85 LD. No other objects are known to come this close until late July.

This report was updated at 2344 UTC with the discovery of recently departed risk-listed 2013 HT14 (MPEC). Today's first traffic report was generated at 1301 UTC.



Notes: Ten times the distance to the Moon (ten LD) has no astronomical significance but is a useful reporting boundary. Object distances are interpreted 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 April '13

The MPC's NEO Confirmation Page has 15 listings

When last checked at 2302 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had fifteen objects listed. Of these, five were "one nighters." The Tracking News counted a total of 35 listings on the NEOCP on this day.

New MPECs  on 23 April '13

Minor Planet Electronic Circulars

There were thirteen MPECs posted this day from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2013-H40 - "21:23 UT" - 2013 HU14


MPEC 2013-H39 - "21:19 UT" - 2013 HT14


<< OOC on 23 Apr. '13 >> MPEC 2013-H38 - "19:57 UT" - Observations and Orbits of Comets


<< DOU on 23 Apr. '13 >>  MPEC 2013-H37 - "06:04 UT" - Daily Orbit Update


MPEC 2013-H36 - "03:41 UT" - Comet C/2012 OP (Siding Spring)


MPEC 2013-H35 - "02:34 UT" - 2013 HR11


MPEC 2013-H34 - "02:25 UT" - 2013 HO11


MPEC 2013-H33 - "02:21 UT" - 2013 HS11


MPEC 2013-H32 - "02:17 UT" - 2013 HP11


MPEC 2013-H31 - "02:13 UT" - 2013 HN11


MPEC 2013-H30 - "02:09 UT" - 2013 HM11


MPEC 2013-H29 - "02:05 UT" - 2013 HL11


MPEC 2013-H28 - "02:01 UT" - 2013 HK11

Observers  on 23 April '13

A total of 106 observers appeared in this day's MPECs.

CodeObserver / observatory
349Ageo Obs. in Japan, 9 in MPEC 2013-H38 -- C/2013 F3, C/2013 F1, C/2013 E2, C/2012 S1, C/2011 L4, C/2010 R1, 273P, 246P, 63P
B54Ager Obs. in Spain, 2 in MPEC 2013-H38 -- C/2011 J2, C/2010 R1
J24Altamira Obs. in the Canary Islands, 22 in MPEC 2013-H38 -- C/2013 G7, C/2013 G2, C/2013 F2, C/2013 F1, C/2013 E1, C/2012 L1, C/2012 F3, P/2012 F2, P/2012 B1, C/2011 UF305, C/2011 R1, C/2011 L4, C/2011 J2, C/2010 R1, C/2006 S3, 274P, 273P, 256P, 175P, 117P, 63P, 29P
Z74Amanecer de Arrakis Obs., 5 in MPEC 2013-H38 -- C/2012 S1, C/2011 L4, C/2011 J2, 175P, 63P
E23Arcadia Obs. in New South Wales, 1 in MPEC 2013-H40 -- 2013 HU14
H21Astronomical Research Obs. Westfield in Illinois, 13 in MPECs 2013-H29, 2013-H33, 2013-H34, 2013-H35 & 2013-H37 -- 2013 HS11, 2013 HR11, 2013 HO11, 2013 HL11, 2013 GE84, 2013 CU129, 2012 XY6, 2009 SQ104, 89958, 53550, 263976, 1981, 1036
A81Balzaretto Obs. in Italy, 1 in MPEC 2013-H38 -- 63P
C77Bernezzo Obs. in Italy, 1 in MPEC 2013-H38 -- C/2011 R1
300Bisei Spaceguard Center in Japan, 3 in MPECs 2013-H28, 2013-H38 & 2013-H40 -- 2013 HU14, 2013 HK11, C/2012 K1
C86Blanes Obs. in Spain, 1 in MPEC 2013-H38 -- 63P
I99Blanquita Obs. in Spain, 2 in MPEC 2013-H38 -- C/2011 J2, 63P
B96Brixiis Obs. in Belgium, 10 in MPEC 2013-H38 -- C/2013 F1, C/2012 S1, P/2012 B1, C/2011 R1, C/2011 L4, C/2011 J2, C/2010 S1, C/2010 R1, C/2006 S3, 273P
215Buchloe Obs. in Germany, 9 in MPEC 2013-H38 -- C/2013 F2, C/2013 F1, C/2013 C2, C/2012 Y3, C/2012 S1, P/2012 B1, 175P, 134P, 26P
G36CASADO in Spain, 2 in MPEC 2013-H38 -- C/2006 S3, 49P
B20Carmelita Obs. in Spain, 3 in MPEC 2013-H38 -- C/2011 L4, C/2011 J2, 63P
I72Carpe Noctem Obs., 12 in MPEC 2013-H38 -- C/2013 F1, C/2012 X1, C/2012 S1, C/2012 K1, P/2012 B1, C/2011 R1, C/2011 L4, C/2011 J2, C/2010 R1, 273P, 175P, 63P
B53Casal Lumbroso Obs. in Italy, 2 in MPEC 2013-H38 -- C/2011 R1, C/2011 L4
160Castelmartini Obs. in Italy, 13 in MPECs 2013-H37 & 2013-H38 -- C/2012 X1, C/2012 S1, C/2012 K1, P/2012 B1, C/2011 R1, C/2010 S1, C/2010 R1, C/2009 P1, 354952, 274855, 206910, 175P, 63P
703Catalina Sky Survey (CSS) in Arizona, 24 in MPECs 2013-H28, 2013-H32, 2013-H37 & 2013-H38 -- 2013 HP11, 2013 HK11, 2013 GV68, C/2013 G9, C/2013 F2, 2013 EA, C/2013 B2, 2012 TF53, C/2012 LP26, C/2012 K1, C/2011 J2, 2006 HB, 2006 GX2, 89958, 350462, 343158, 141531, 141495, 137158, 11405, 278P, 274P, 256P, 175P
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 18 in MPECs 2013-H29, 2013-H30, 2013-H32, 2013-H33, 2013-H36, 2013-H37, 2013-H39 & 2013-H40 -- 2013 HU14, 2013 HT14, 2013 HS11, 2013 HP11, 2013 HM11, 2013 HL11, 2013 GT79, 2013 GJ35, 2013 GH84, 2013 GC55, 2013 GA80, 2013 FD11, 2013 EW27, 2013 ES89, 2013 CW35, C/2012 OP, 2007 VY7, 2005 EF
807~program code "~" (34) via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2013-H38 -- C/2013 A1
A77Chante-Perdrix Obs. in France, 10 in MPEC 2013-H38 -- C/2012 X1, C/2012 L2, P/2012 B1, C/2011 R1, C/2011 J2, C/2006 S3, 273P, 117P, 63P, 29P
B92Chinon Obs. in France, 5 in MPEC 2013-H38 -- C/2011 R1, C/2010 S1, C/2006 S3, 117P, 29P
J01Cielo Profundo Obs. in Spain, 12 in MPEC 2013-H38 -- C/2013 G7, C/2012 K1, P/2012 B1, C/2011 R1, C/2011 L4, C/2011 J2, C/2010 R1, C/2006 S3, 273P, 175P, 63P, 29P
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2013-H38 -- C/2012 S1
821Cordoba Obs. Bosque Alegre Station in Argentina, 1 in MPEC 2013-H36 -- C/2012 OP
B50Corner Obs. in Germany, 2 in MPEC 2013-H38 -- C/2012 S1, 273P
448Desert Moon Obs. in New Mexico, 3 in MPECs 2013-H30, 2013-H32 & 2013-H37 -- 2013 HP11, 2013 HM11, 229007
K36Ebersheim Obs., 2 in MPEC 2013-H38 -- C/2012 S1, C/2012 L2
J19El Maestrat Obs. in Spain, 3 in MPECs 2013-H37 & 2013-H38 -- C/2012 K1, 7888, 273P
I57Elche Obs., 7 in MPEC 2013-H38 -- C/2013 F2, C/2013 E2, C/2012 K1, C/2012 F3, C/2011 R1, C/2011 L4, 117P
F657Paul Roche in Wales via Faulkes Telescope North in Hawaii, 1 in MPEC 2013-H36 -- C/2012 OP
E107program code 7 via Faulkes Telescope South in New South Wales, 1 in MPEC 2013-H38 -- C/2012 K5
157Frasso Sabino Obs. in Italy, 1 in MPEC 2013-H38 -- C/2013 F1
G26Fushan Obs., 5 in MPEC 2013-H38 -- C/2011 R1, C/2011 J2, C/2006 S3, 117P, 63P
C73Galati Obs. in Romania, 3 in MPEC 2013-H38 -- C/2013 G7, C/2012 K1, C/2011 L4
372Geisei Obs. in Japan, 9 in MPEC 2013-H38 -- C/2013 G7, C/2013 G6, C/2013 G5, C/2013 F1, C/2013 E2, C/2012 Y3, C/2012 Y1, P/2011 R3, C/2011 J2
203GiaGa Obs. in Italy, 2 in MPEC 2013-H38 -- P/2012 B1, C/2011 J2
B83Gieres Obs. in France, 5 in MPEC 2013-H38 -- C/2012 K1, C/2011 R1, C/2011 J2, C/2006 S3, 273P
J95Great Shefford Obs. in England, 7 in MPECs 2013-H28, 2013-H29, 2013-H30, 2013-H31, 2013-H32, 2013-H33 & 2013-H34 -- 2013 HS11, 2013 HP11, 2013 HO11, 2013 HN11, 2013 HM11, 2013 HL11, 2013 HK11
511Haute Provence Obs. in Germany, 4 in MPEC 2013-H38 -- C/2012 F3, P/2012 B1, 256P, 78P
D88Hiratsuka Obs. in Japan, 10 in MPEC 2013-H38 -- C/2013 D1, C/2012 S1, C/2011 R1, C/2011 J2, C/2010 R1, C/2006 S3, 273P, 175P, 117P, 63P
C43Hoyerswerda Obs. in Germany, 4 in MPEC 2013-H38 -- C/2011 L4, C/2010 R1, C/2006 S3, 117P
J37Huelva Obs. in Spain, 2 in MPEC 2013-H38 -- C/2011 R1, C/2011 L4
H15ISON-NM Obs. in New Mexico, 2 in MPEC 2013-H38 -- C/2010 R1, 246P
C32Ka-Dar Obs. TAU Station in Russia, 6 in MPEC 2013-H38 -- P/2013 A2, C/2009 P1, 272P, 244P, 175P, 168P
585Kiev Comet Station in the Ukraine, 9 in MPEC 2013-H38 -- C/2013 F1, C/2012 K1, C/2011 R1, C/2011 J2, C/2010 R1, 280P, 273P, 175P, 63P
168Kourovskaya Obs. in Russia, 1 in MPEC 2013-H38 -- C/2012 L1
D95Kurihara Obs. in Japan, 10 in MPEC 2013-H38 -- C/2013 E2, C/2012 V2, C/2012 S3, C/2012 L2, C/2012 K1, C/2011 R1, C/2011 L4, C/2006 S3, 117P, 29P
W85LCOGT Cerro Tololo A in Chile, 2 in MPECs 2013-H30 & 2013-H36 -- 2013 HM11, C/2012 OP
J38La Vara Obs. in Spain, 7 in MPEC 2013-H38 -- C/2012 X1, C/2012 S1, C/2012 L2, C/2011 J2, C/2006 S3, 63P, 29P
H01Magdalena Ridge Obs. (MRO) in New Mexico, 4 in MPECs 2013-H28, 2013-H35, 2013-H39 & 2013-H40 -- 2013 HU14, 2013 HT14, 2013 HR11, 2013 HK11
C10Maisoncelles Obs. in France, 9 in MPEC 2013-H38 -- C/2013 G3, C/2013 G1, C/2013 F3, C/2013 F1, C/2013 E1, 280P, 273P, 256P, 29P
5682David Tholen's team on Mauna Kea in Hawaii, 3 in MPECs 2013-H29, 2013-H30 & 2013-H38 -- 2013 HM11, 2013 HL11, C/2013 G8
711McDonald Obs. in Texas, 10 in MPECs 2013-H29, 2013-H30, 2013-H31, 2013-H32, 2013-H33, 2013-H34, 2013-H35 & 2013-H37 -- 2013 HS11, 2013 HR11, 2013 HQ11, 2013 HP11, 2013 HO11, 2013 HN11, 2013 HM11, 2013 HL11, 2013 FT13, 2007 VY7
118Modra Obs. in Slovakia, 1 in MPEC 2013-H38 -- C/2012 LP26
213Montcabre Obs. in Spain, 11 in MPEC 2013-H38 -- C/2013 G7, C/2013 G6, C/2013 F1, C/2012 X1, C/2012 S1, C/2012 K1, C/2011 R1, C/2011 L4, C/2011 J2, 273P, 29P
945Monte Deva Obs. in Spain, 7 in MPEC 2013-H38 -- C/2012 S1, C/2011 L4, C/2011 J2, C/2006 S3, 273P, 63P, 29P
C91Montevenere Obs., 9 in MPEC 2013-H38 -- C/2013 F1, C/2012 F3, P/2012 B1, C/2011 R1, C/2011 J2, C/2010 R1, 273P, 175P, 63P
900Moriyama Obs. in Japan, 1 in MPEC 2013-H38 -- C/2012 L2
474Mt. John Obs. in New Zealand, 1 in MPEC 2013-H36 -- C/2012 OP
G96Mt. Lemmon Survey (MLS) in Arizona, 10 in MPECs 2013-H34, 2013-H37, 2013-H38, 2013-H39 & 2013-H40 -- 2013 HU14, 2013 HT14, 2013 HO11, 68348, 210012, 141531, 137911, 280P, 117P, 98P
E07Murrumbateman Obs. in New South Wales, 4 in MPEC 2013-H38 -- C/2013 G1, C/2013 E1, C/2013 D1, C/2013 C2
A13Naef Obs. in Switzerland, 2 in MPEC 2013-H38 -- P/2012 B1, C/2010 R1
A24New Millennium Obs. in Italy, 29 in MPECs 2013-H37 & 2013-H38 -- 2013 FY13, C/2013 F2, C/2013 F1, 2013 EV108, 2013 EO126, C/2012 X1, C/2012 K1, C/2011 J2, C/2010 R1, 2009 SQ104, 2009 BL2, 2006 GX2, 54686, 357005, 350988, 275974, 214869, 19764, 184990, 163696, 161998, 152952, 137199, 8176, 7888, 4034, 2329, 1866, 1864
C47Nonndorf Obs. in Austria, 8 in MPEC 2013-H38 -- C/2013 F1, C/2012 S1, C/2011 L4, C/2011 J2, C/2006 S3, 274P, 273P, 175P
423North Ryde Obs. in New South Wales, 4 in MPEC 2013-H38 -- C/2013 G2, C/2006 S3, 117P, 29P
C23Olmen Obs. in Belgium, 14 in MPEC 2013-H38 -- C/2013 G5, C/2013 F1, C/2013 E2, C/2012 S1, C/2012 L2, P/2012 B1, C/2011 R1, C/2011 L4, C/2011 J2, C/2010 R1, 273P, 256P, 117P, 63P
J43Oukaimeden Obs. in Morocco, 1 in MPEC 2013-H38 -- C/2012 F3
I41Palomar Transient Factory (PTF) in southern California, 4 in MPECs 2013-H31, 2013-H37 & 2013-H38 -- 2013 HN11, C/2011 J2, 139289, 280P
F51Pan-STARRS 1 (PS1) in Hawaii, 19 in MPECs 2013-H29, 2013-H30, 2013-H32, 2013-H33, 2013-H35, 2013-H37 & 2013-H38 -- 2013 HS11, 2013 HR11, 2013 HQ11, 2013 HP11, 2013 HM11, 2013 HL11, 2012 HW1, P/2011 U2, P/2011 C2, C/2006 S3, 65909, 354952, 350462, 164201, 141495, 6050, 278P, 162P, 117P
A32Panker Obs. in Germany, 6 in MPEC 2013-H38 -- C/2013 C2, C/2013 B2, C/2012 X1, C/2012 S1, P/2012 B1, C/2010 R1
H23Pear Tree Obs. in Florida, 1 in MPEC 2013-H38 -- 273P
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 17 in MPEC 2013-H38 -- C/2013 G7, C/2013 G6, C/2013 F2, C/2013 F1, C/2013 B2, C/2012 X1, C/2012 S1, P/2012 B1, C/2011 UF305, C/2011 R1, C/2011 J2, C/2010 R1, C/2006 S3, 273P, 175P, 117P, 63P
J53Posadas Obs. in Spain, 4 in MPEC 2013-H38 -- P/2012 B1, C/2011 J2, 175P, 63P
D29Purple Mtn. Obs. Xuyi Station in China, 4 in MPEC 2013-H38 -- C/2012 LP26, C/2012 K1, 175P, 63P
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 8 in MPEC 2013-H38 -- C/2013 D1, C/2012 K1, C/2012 F3, P/2012 B1, C/2011 R1, C/2006 S3, 244P, 175P
W71Rand II Obs., 1 in MPEC 2013-H38 -- C/2012 S1
939Rodeno Obs. in Spain, 10 in MPEC 2013-H38 -- C/2012 S1, C/2012 L2, C/2012 K1, P/2012 B1, C/2011 L4, C/2011 J2, C/2010 S1, C/2006 S3, 273P, 63P
C95SATINO-1 in France, 3 in MPEC 2013-H38 -- C/2011 L4, 273P, 63P
461SZTE Asteroid Program in Hungary, 2 in MPEC 2013-H38 -- C/2012 S1, 273P
233San Vito Obs. in Italy, 4 in MPEC 2013-H38 -- C/2011 L4, C/2011 J2, 273P, 63P
H36Sandlot Obs. in Kansas, 4 in MPECs 2013-H32, 2013-H33, 2013-H34 & 2013-H40 -- 2013 HU14, 2013 HS11, 2013 HP11, 2013 HO11
B70Sant Celoni Obs. in Spain, 2 in MPEC 2013-H38 -- C/2011 J2, C/2010 R1
B74Santa Maria de Montmagastrell Obs. in Spain, 3 in MPEC 2013-H38 -- C/2013 G7, 274P, 29P
C48Sayn Solar Obs. in Russia, 1 in MPEC 2013-H38 -- C/2013 G5
204Schiaparelli Obs. in Italy, 2 in MPECs 2013-H30 & 2013-H36 -- 2013 HM11, C/2012 OP
E12Siding Spring Survey (SSS) in New South Wales, 5 in MPECs 2013-H36, 2013-H37 & 2013-H38 -- C/2013 G7, C/2013 A1, C/2012 OP, 53435, 278P
G68Sierra Stars Obs. in northern California, 3 in MPEC 2013-H38 -- C/2012 K1, P/2012 B1, C/2011 J2
G402program code 2 via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2013-H38 -- C/2012 S1
691Spacewatch 0.9m telescope in Arizona, 2 in MPECs 2013-H32 & 2013-H37 -- 2013 HQ11, 2013 HP11
291Spacewatch 1.8m telescope in Arizona, 7 in MPECs 2013-H29, 2013-H30, 2013-H31, 2013-H35, 2013-H37 & 2013-H38 -- 2013 HR11, 2013 HQ11, 2013 HN11, 2013 HM11, 2013 HL11, P/2013 A2, C/2012 S1
Z86St. Mellons Obs., 2 in MPEC 2013-H38 -- C/2012 S1, P/2012 B1
I93St. Pardon de Conques Obs. in France, 4 in MPECs 2013-H30, 2013-H31, 2013-H33 & 2013-H34 -- 2013 HS11, 2013 HO11, 2013 HN11, 2013 HM11
C36Starry Wanderer Obs. in Belarus, 1 in MPEC 2013-H38 -- P/2012 B1
I52Steward Obs. Mt. Lemmon Station in Arizona, 1 in MPEC 2013-H34 -- 2013 HO11
954Teide Obs. in the Canary Islands, 1 in MPEC 2013-H30 -- 2013 HM11
926Tenagra II Obs. in Arizona, 5 in MPECs 2013-H37 & 2013-H38 -- C/2012 LP26, C/2011 R1, C/2010 R1, 7977, 29P
C35Terrassa Obs., 8 in MPEC 2013-H38 -- C/2012 K1, C/2011 R1, C/2011 J2, C/2010 S1, C/2006 S3, 117P, 63P, 29P
H78Univ. of Narino Obs. in Colombia, 1 in MPEC 2013-H38 -- C/2012 S1
B51Vallauris Obs. in France, 4 in MPEC 2013-H38 -- C/2013 E1, C/2011 R1, C/2006 S3, 273P
H47Vicksburg Obs. in Mississippi, 7 in MPEC 2013-H38 -- C/2012 K1, P/2012 B1, C/2011 R1, C/2010 R1, C/2009 P1, 175P, 63P
367Yatsuka Obs. in Japan, 7 in MPEC 2013-H38 -- C/2013 E2, C/2012 K1, C/2011 R1, C/2011 L4, C/2010 S1, 273P, 246P
J08Zonalunar Obs. in Spain, 1 in MPEC 2013-H38 -- C/2011 L4
H06iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2013-H38 -- 273P
H06#M. Suzuki via iTelescope Obs. Mayhill in New Mexico, 2 in MPEC 2013-H38 -- C/2013 E2, C/2011 L4
H06`Erik Bryssinck in Belgium via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2013-H38 -- C/2013 G1
H06|Hidetaka Sato in Japan via iTelescope Obs. Mayhill in New Mexico, 16 in MPECs 2013-H36 & 2013-H38 -- C/2013 G8, C/2013 G5, C/2013 G1, C/2013 F1, C/2013 E2, C/2012 OP, P/2012 NJ, C/2012 L1, C/2012 J1, C/2012 E1, C/2012 BJ98, C/2011 KP36, C/2010 L3, 273P, 257P, 125P
I89iTelescope Obs. Nerpio in Spain, 2 in MPEC 2013-H38 -- C/2012 K1, 273P
Q621program code 1 via iTelescope Obs. Siding Spring in New South Wales, 15 in MPECs 2013-H36 & 2013-H38 -- C/2013 G6, P/2013 G4, C/2013 G3, C/2013 G2, C/2013 G1, C/2013 F3, C/2012 Y3, C/2012 X2, C/2012 OP, C/2011 F1, 262P, 197P, 152P, 102P, 17P
Q623program code 3 via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2013-H38 -- C/2013 G7
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 23 April '13

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2302 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 JPL NEO Program 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
2013 HT14JPL Sentry23022021-207775.1e-06-5.04-5.050JPL: "Analysis based on 23 observations spanning 2.0169 days (2013-Apr-21.25884 to 2013-Apr-23.27569)." Diameter approximately 0.019 km. from mean, weighted H=26.3.

Legend: VI# = VI count, Prob Cum = cumulative probability, PS Cum/Max = cumulative/maximum Palermo Scale, TS = Torino Scale

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 April '13

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

2359Noted that NEODyS has posted 2013 HT14 as an impact risk - see above
2344Updated Traffic Report
2303Grabbed MPEC 2013-H39 - 2013 HT14 - see above
Grabbed MPEC 2013-H40 - 2013 HU14 - see above
2302Noted that JPL Sentry has posted 2013 HT14 as an impact risk - see above
2105Grabbed MPEC 2013-H38 - Observations and Orbits of Comets - see above
1300Grabbed MPEC 2013-H36 - Comet C/2012 OP (Siding Spring) - see above
Grabbed MPEC 2013-H37 - Daily Orbit Update - see above
0240Grabbed MPEC 2013-H30 - 2013 HM11 - see above
Grabbed MPEC 2013-H31 - 2013 HN11 - see above
Grabbed MPEC 2013-H32 - 2013 HP11 - see above
Grabbed MPEC 2013-H34 - 2013 HO11 - see above
Grabbed MPEC 2013-H35 - 2013 HR11 - see above
0239Grabbed MPEC 2013-H28 - 2013 HK11 - see above
Grabbed MPEC 2013-H29 - 2013 HL11 - see above
Grabbed MPEC 2013-H33 - 2013 HS11 - see above