Monday16 February 200410:09pm MST2004-02-17 UTC 0509 back top next  

The Asteroid/Comet Connection's
daily news journal about
asteroids, comets, and meteors

Today's issue status: done

Comet 67P/Churyumov-Gerasimenko [link|alt] imaged 23 March 2003 and ©Copyright by Martin Christoph Tschimmel and Christoph Ries using a 0.8m telescope at Mt. Wendelstein Observatory. This image is provided by Herbert Raab from his Astrometrica site, a portion of a composite he created from three 300-second grayscale exposures made with a near-infrared (I), red (R), or green-yellow (V) filter, used respectively for the red, green, and blue (RGB) channels seen here, thus background stars appear as multicolor streaks. This comet is the destination of ESA's Rosetta mission, set to launch ten days from today.

Small objects – part 1/2 Major News for 16 Feb. 2004 back top next  
EasySky screen shots of Earth's
neighborhood on 15 Feb. 2004
with known H>22.0 objects as
green dots. Those observed are
shown circled and with orbits.
The ecliptic grid is set at 10 LD.
 Small objects  Discovery & follow-up 9-15 February

Last week four new small objects with absolute magnitude H>22.0 were announced, and ten others were tracked. And observations from last October 29th were reported for four more within their observing arcs by David Tholen's University of Hawaii team at Mauna Kea.

The discoveries came one each from the Catalina Sky Survey (CSS), the Spacewatch 0.9m telescope, NEAT's Mt. Palomar telescope, and LONEOS. They got lots of follow-up attention, but only Jornada Observatory went after multiple older discoveries — four of them, while Tenagra II Observatory and San Marcello Pistoiese Observatory bagged one apiece. LINEAR doesn't appear anywhere in this work.

Objects are listed smallest first. H and Earth MOID (minimum orbital intersection) are from JPL, and other MOIDs from Lowell Observatory. Earth MOIDs that would be categorized hazardous for larger objects are flagged yellow. Diameters are best estimates from a very inexact standard H-to-size formula. Priorities and visibilities are from the European Spaceguard Central Node. All data is from Sunday.

<< last week's report | skip the "Small objects" table | Small objects table >>

If an asteroid's orbit brings it to within 0.05 AU of Earth's orbit, it is categorized as "potentialy hazardous" unless it has an absolute magnitude H greater than 22.0, which corresponds to a diameter on the order of 135 meters/yards. Larger H is dimmer, thus smaller. 0.05 astronomical units (AU) is about 19.5 times the distance between Earth and Moon (0.00256 AU).     Right: Composite from EasySky screen shots.
Small objects – part 2/2 (table) Major News for 16 Feb. 2004 back top next  

Small object observation summary for 9-15 February

H = absolute magnitude (brightness), from which size is roughly estimated   —   m/yd = meters/yards   —   [cross index]
All objects had observations reported last week. Those on a light-blue background had observations from only before the week.

European Spaceguard Central Node
2004 BG41
36 m/yd24.8924.924.8 2004-B360.01341 AUNecessary, visibility ends 18 Feb.
2004 BG41 was observed on 14 Feb. by Jornada Obs.
2004 CQ
37 m/yd24.8024.824.6 2004-C390.04001 AUUseful, visibility ends 14 Mar.
NEW: 2004 CQ was discovered on 10 Feb. by the Catalina Sky Survey (CSS), was confirmed on 10 Feb. by Powell Obs., Crni Vrh Obs., Consell Obs., Obs. Astronomico de Mallorca (OAM), and Great Shefford Obs., and on 11 Feb. by Great Shefford Obs. (see image below), and was announced in MPEC 2004-C39 of 11 Feb. This object was also observed on 11 Feb. by Tenagra II Obs., San Marcello Pistoiese Obs., and La Canada Obs., on 12 Feb. by Desert Moon Obs. and Begues Obs., on 13 Feb. by Begues, Tenagra II, and La Canada observatories, and on 14 Feb. by Desert Moon Obs. and Pla D'Arguines Obs.
2004 CZ1
43 m/yd24.5024.524.4 2004-C490.00409 AUUrgent, visibility ends 24 Feb.
NEW: 2004 CZ1 was discovered on 12 Feb. with the Spacewatch 0.9m telescope, was confirmed on 12 Feb. by Table Mountain Obs., the Spacewatch 1.8m telescope, Desert Moon Obs., Consell Obs., and KLENOT, and on 13 Feb. by Table Mountain Obs. and Three Buttes Obs., and was announced in MPEC 2004-C49 of 13 Feb. It was also observed on 13 Feb. by Sabino Canyon Obs., Sandlot Obs., and Tenagra II Obs.
2004 BY1
44 m/yd24.4324.525.0 2004-B100.02118 AUNecessary, visibility ends 19 Feb.
2004 BY1 was observed on 14 Feb. by Jornada Obs. It has an MOID of 0.004 AU with Venus.
2003 UO12
45 m/yd24.4024.424.4 2003-U440.01504 AU
2003 UO12 was reported this last week as observed on 29 Oct. 2003 from Mauna Kea. It has MOIDs of 0.032 AU with Mars and 0.622 AU with Jupiter.
2003 UQ25
49 m/yd24.2024.124.7 2003-U700.01626 AU
2003 UQ25 was reported this last week as observed on 29 Oct. 2003 from Mauna Kea, within the existing observation arc. It has MOIDs of 0.000 AU with Mars and 0.940 AU with Jupiter.
2004 BF11
51 m/yd24.0924.124.2 2004-B150.14205 AUUseful, visibility ends 24 Feb.
2004 BF11 was observed on 14 Feb. by Jornada Obs. It has an MOID of 0.047 AU with Mars.
2004 CA2
64 m/yd23.6323.823.4 2004-C500.00715 AUNecessary, visibility ends 6 Mar.
NEW: 2004 CA2 was discovered on 12 Feb. by NEAT/Palomar, was confirmed on 12 Feb. by KLENOT, and on 13 Feb. by Three Buttes Obs., and was announced in MPEC 2004-C50 of 13 Feb. This object was also observed on 12 Feb. by Desert Eagle Obs. and Sormano Obs., on 13 Feb. by Table Mountain Obs. and Sandlot Obs., and on 15 Feb. by Pla D'Arguines Obs.
2003 UP25
78 m/yd23.2023.723.5 2003-U690.07794 AU
2003 UP25 was reported this last week as observed on 29 Oct. 2003 from Mauna Kea.
2004 BB75
101 m/yd22.6323.122.6 2004-B650.03611 AUNecessary, visibility ends 16 Mar.
2004 BB75 was observed on 10 Feb. by Tenagra II Obs.
2004 BK11
106 m/yd22.5222.422.5 2004-B190.27819 AUUseful, visibility ends 27 Feb.
2004 BK11 was observed on 14 Feb. by Jornada Obs.
2004 BW18
126 m/yd22.1522.622.5 2004-B240.04564 AUUseful, visibility ends 28 May
2004 BW18 was observed on 10 Feb. by San Marcello Pistoiese Obs.
2003 UC22
134 m/yd22.0122.122.0 2003-U600.26564 AU
2003 UC22 was reported this last week as observed on 29 Oct. 2003 from Mauna Kea.
2004 CE39
164 m/yd21.5822.422.4 2004-C600.08283 AU
NEW: 2004 CE39 was discovered on 14 Feb. by LONEOS, was confirmed on 14 Feb. by NEAT/Palomar, and on 15 Feb. by Gnosca Obs. and Sandlot Obs., and was announced in MPEC 2004-C60 of 15 Feb.

  Small object observation cross index   [table top]

ObjectObserved by MPC code
2003 QL96568
2003 UC22568
2003 UO12568
2003 UP25568
2003 UQ25568
2004 BB75926
2004 BF11715
2004 BG41715
2004 BK11715
2004 BW18104
2004 BY1715
2004 CA2246, 333, 587, 644, 673, 941, G90 & H36
2004 CE39143, 644, 699 & H36
2004 CQ104, 106, 170, 176, 448, 620, 649, 703, 926, 941, J87 & J95
2004 CZ1176, 246, 291, 448, 673, 691, 854, 926, G90 & H36
CodeObservatoryObjects observed (days)
104San Marcello Pistoiese Obs.2004 BW18 & 2004 CQ
106Crni Vrh Obs.2004 CQ
143Gnosca Obs.2004 CE39
170Begues Obs.2004 CQ(2)
176Consell Obs.2004 CQ & 2004 CZ1
246KLENOT2004 CA2 & 2004 CZ1
291Spacewatch 1.8m telescope2004 CZ1
333Desert Eagle Obs.2004 CA2
448Desert Moon Obs.2004 CQ(2) & 2004 CZ1
568Mauna Kea (David Tholen)2003 QL96, 2003 UC22, 2003 UO12, 2003 UP25 & 2003 UQ25
587Sormano Obs.2004 CA2
620Obs. Astron. de Mallorca2004 CQ
644NEAT/Palomar2004 CA2 & 2004 CE39
649Powell Obs.2004 CQ
673Table Mountain Obs.2004 CA2 & 2004 CZ1(2)
691Spacewatch 0.9m telescope2004 CZ1
699LONEOS2004 CE39
703Catalina Sky Survey (CSS)2004 CQ
715Jornada Obs.2004 BF11, 2004 BG41, 2004 BK11 & 2004 BY1
854Sabino Canyon Obs.2004 CZ1
926Tenagra II Obs.2004 BB75, 2004 CQ(2) & 2004 CZ1
941Pla D'Arguines Obs.2004 CA2 & 2004 CQ
G90Three Buttes Obs.2004 CA2 & 2004 CZ1
H36Sandlot Obs.2004 CA2, 2004 CE39 & 2004 CZ1
J87La Canada Obs.2004 CQ(2)
J95Great Shefford Obs.2004 CQ(2)
News briefs – part 1/1 Major News for 16 Feb. 2004 back top next  
News briefs

Rosetta:  The European Space Agency (ESA) has another Rosetta comet mission preview today, "Hi-tech in space — Rosetta — a space sophisticate," with an emphasis on the spacecraft's "Twelve cubic metres of technical wizardry."

Update:  See also ESA's 17 February note to media representatives about the launch.

2004 CQ on 10-11 Feb. 2004
by Great Shefford Obs.

2004 CQ confirmation imagery from 10-11 February by Great Shefford Observatory. Read more about this recently discovered small object above.

Risk monitoring - part 1/1 Major News for 16 Feb. 2004 back top next  
Risk monitoring 16 Feb.

Today NEODyS posted 2004 CK39, which was announced yesterday and posted overnight by JPL with a much different but also low-rated assessment. There are no observations reported in Monday's Daily Orbit Update MPEC for either of the objects listed with impact solutions and currently in view, but the Minor Planet Center (MPC) Last Observation page is showing that Powell Observatory in Kansas caught 2004 CK39 this morning.

The European Spaceguard Central Node today posted an observing campaign for 2004 CK39.

2004 BG121 was removed from the MPC NEO Confirmation Page (NEOCP) overnight. (If that sounds a little odd to you, see yesterday's news.)

Summary Risk Table - sources checked at 0505 UTC, 17 Feb




 2004 CK39 NEODyS 2/162011-204914-5.51-5.8201.025
JPL 2/162097-20971-6.64-6.6401.025
 2004 BG121 NEODyS 2/142005-2080123-3.65-3.9400.934
JPL 2/13R E M O V E D
VI = count of "virtual impactors" (impact solutions)
See A/CC's Consolidated Risk Tables for more and maybe
  newer details, and check the monitors' links for latest info.
Note that only objects recently in view are shown here.   [ top ]
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