Sunday25 April 20047:55pm MDT2004-04-26 UTC 0155 back top next  

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


Today's issue status: done
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Cover: From left to right, Pla D'Arguines and Begues observatories in southern Spain have been keeping an eye on 2004 HM, as seen seen at upper left early on the 19th and lower right late on the 21st. This small object with currently one impact solution (see below) has been flying near Earth since its discovery April 16th, three days after it came within 5.1 lunar distances. See also the April 19th cover with Pla D'Arguines confirmation images from the 18th.

Small objects – panel 1/2 Major News for 25 April 2004 back top next  

Small objects
Discovery & follow-up 19-25 April

From Monday through today, six newly discovered small asteroids were announced (two with impact solutions), ten more small ones were followed (one with impact solutions), and there were belated reports of follow-up observations for another four, plus results found in the archives for three more. The recent work involved 23 observing facilities. (By "small," we mean with absolute magnitude of H=22.0 or greater, which converts by a standard but inexact formula to 135 meters/yards wide or less.)

According to the JPL Closest Approaches page, the closest flybys for this last week were 2004 GD, which came within 6.0 lunar distances (LD) on April 20th, 2004 HB at 10.2 LD on the 21st, and 2004 HC33 at 7.2 LD today.

<< previous report | skip table | Small objects table >>

If an asteroid's orbit brings it to within 0.05 AU of Earth's orbit, it is categorized as "potentially 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. And 0.05 astronomical units (AU) is about 19.5 times the distance between Earth and Moon (0.00256 AU).

Notes: Diameters in the following observation summary table are rough best estimates from a standard but very inexact H-to-size formula using H (absolute magnitude) from the JPL NEO Orbital Elements page, source also for Earth MOID (minimum orbital intersection). Other planetary MOIDs are from Lowell Observatory. Current Minor Planet Center H is also given, along with the original H from each object's discovery MPEC. Priorities, visibilities, and campaigns are from the European Spaceguard Central Node (SCN).

Small objects – panel 2/2 (table) Major News for 25 April 2004 back top next  

Small object observation summary for 19-25 April

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.


Object
Estimated
diameter
JPL
H
MPC
H
Discovery
H in MPEC
Earth
MOID
European Spaceguard Central Node
priority/visibility/campaign
2004 HE
Apollo
15 m/yd26.8026.826.7 2004-H160.00004 AU
2004 HE was reported this last week as observed on 17 April by Mt. John Obs. This was the only observation of this Earth-Moon system intruder reported after its discovery announcement (see special report), adding six hours to what was originally a 1.173-day observing arc. It has an MOID of 0.027 AU with Mars.
2004 HC33
Apollo
23 m/yd25.8525.925.8 2004-H600.01762 AU
NEW: 2004 HC33 was discovered on 23 April by FMO Project online volunteer Robert Gagliano of Arizona with the Spacewatch 0.9m telescope (see report yesterday), was confirmed on 23 April with the Spacewatch 1.8m telescope and Great Shefford Obs., and on 24 April by Grasslands Obs., and was announced in MPEC 2004-H60 of 24 April. This object was also observed on 24 April by LINEAR and Tenagra II Obs., and on 25 April by Great Shefford Obs.
2004 HH20
Amor
35 m/yd24.9024.924.7 2004-H510.03015 AU
NEW: 2004 HH20 was discovered on 21 April by LINEAR, which confirmed it on 22 April along with Great Shefford Obs. It was announced in MPEC 2004-H51 of 23 April, and was also observed on 23 April by LINEAR and Mt. John Obs. and on 24 April by Great Shefford Obs. and Mt. John Obs.
2004 HD
Amor
40 m/yd24.6324.824.5 2004-H190.03049 AU
2004 HD was observed on 17 April by Wykrota Obs., on 18 April by Hunters Hill Obs., on 19 April by Tenagra II Obs., on 20 April by Hunters Hill Obs., on 21 and 22 April by LINEAR and Hunters Hill Obs., on 23 April by Mt. John Obs., and on 25 April by Consell Obs.
2004 GD2
Apollo
52 m/yd24.0824.324.2 2004-G280.02000 AUUseful, visibility ends 7 Jun.
2004 GD2 was observed on 18 April by Hunters Hill Obs., on 19 and 24 April by Great Shefford Obs., and on 22 and 23 April by LINEAR. It has an MOID of 0.001 AU with Mars.
2004 GC19
Apollo
52 m/yd24.0724.124.1 2004-H060.03503 AUUrgent, visibility ends 28 Apr.
2004 GC19 was observed on 18 April by KLENOT, on 19 April by Great Shefford Obs. and Tenagra II Obs., and on 20 and 22-24 April by Great Shefford Obs.
2004 GZ14
Apollo
53 m/yd24.0123.924.0 2004-G440.02768 AUNecessary, visibility ends 29 Apr.
2004 GZ14 was observed on 18 April by KLENOT and on 19 April by Great Shefford Obs.
2004 FH29
Apollo
58 m/yd23.8424.023.7 2004-F870.01528 AU
2004 FH29 was reported this last week as observed on 9 April with the Australian Natl. Univ. (ANU) Obs. 1.0m telescope.
2004 GD
Apollo
62 m/yd23.6823.723.8 2004-G170.00600 AU
2004 GD was observed on 15 and 16 April by Goodricke-Pigott Obs., on 18 April by KLENOT, on 19 April by Great Shefford Obs., and on 20 April by Sormano Obs. It has an MOID of 0.033 AU with Venus.
2004 FB18
Amor
63 m/yd23.6524.023.5 2004-F760.05858 AUUseful, visibility ends 15 Jun.
2004 FB18 was reported this last week as observed on 13 April with the ANU 1.0m telescope.
2002 CV11
Apollo
63 m/yd23.6423.9 2002-C450.03376 AU
2002 CV11 was reported this last week as observed on 12 Feb. 2002 by NEAT/Palomar, within the existing observing arc.
2004 HB
Apollo
65 m/yd23.6023.923.3 2004-H170.02136 AU
2004 HB was reported this last week as observed on 18 April by Mt. John Obs.
2002 VS85
Apollo
66 m/yd23.5424.124.3 2002-V600.03124 AU
2002 VS85 was reported this last week as observed on 15 Nov. 2002 by NEAT/Palomar, adding six positions and 0.909 day to what had been a 2.165-day arc with 30 observations.
2004 HT38
Amor
71 m/yd23.4023.623.6 2004-H710.09854 AU
NEW: 2004 HT38 was discovered on 24 April by LINEAR, was confirmed on 24 April by Consell Obs., and on 25 April by Great Shefford Obs., Sabino Canyon Obs., Desert Moon Obs., and Mt. John Obs., and was announced in MPEC 2004-H71 of 25 April. It hasn't been reported since.
2004 HQ1
Apollo
has impact solutions
77 m/yd23.2323.123.0 2004-H380.00230 AU
NEW: 2004 HQ1 was discovered on 19 April by LINEAR, was confirmed on 19 April by Great Shefford Obs., and on 20 April by LINEAR, and was announced in MPEC 2004-H38 of 20 April. This object was also observed on 22 April by KLENOT, on 24 April by Consell Obs., and on 21-23 by Great Shefford Obs.
2004 HM
Apollo
has impact solution
86 m/yd22.9823.223.3 2004-H250.00338 AU
2004 HM was observed on 18 April by Wykrota Obs., on 19 April by Pla D'Arguines Obs. and Great Shefford Obs., on 20 April by Sormano Obs., on 21 April by Sandlot Obs. and Begues Obs., on 22 April by KLENOT and the Catalina Sky Survey (CSS), on 23 April by Great Shefford Obs., on 24 April by Begues Obs., and on 25 April by Begues Obs. and Consell Obs. See A/CC news edition "cover" images above and April 19th.
2004 FP4
Amor
89 m/yd22.9023.323.3 2004-F470.05284 AUUseful, visibility ends 22 Jul.
2004 FP4 was observed on 13 April with the ANU 1.0m telescope, and on 21-23 April by LINEAR. It has an MOID of 0.009 AU with Mars.
2004 GB19
Apollo
90 m/yd22.8723.022.7 2004-H040.01060 AUNecessary, visibility ends 25 May
2004 GB19 was observed on 18 April by Hunters Hill Obs., on 19 April by Great Shefford Obs. and Tenagra II Obs., on 20 April by Jornada Obs. and Sormano Obs., on 22 April by Hunters Hill Obs. and KLENOT, and on 23 April by LINEAR. It has an MOID of 0.012 AU with Mars.
2002 VO69
Apollo
106 m/yd22.5223.0 2002-V540.05528 AU
2002 VO69 was reported this last week as observed on 5 Nov. 2002 by NEAT/Palomar. This added three observations and 5.942 days to what had been a 27-position 3.061-day observing arc. This object has an MOID of 0.009 AU with Mars.
2004 BW18
Amor
124 m/yd22.1822.522.5 2004-B240.04478 AUUseful, visibility ends 30 May
2004 BW18 was reported this last week as observed on 13 April with the ANU 1.0m telescope.
2004 HZ
Apollo
has impact solutions
126 m/yd22.1422.722.8 2004-H340.00016 AU
NEW: 2004 HZ was discovered on 19 April by LINEAR, was confirmed on 19 April by Obs. Astronomico de Mallorca (OAM, see April 21st "cover"), and on 20 April by Desert Moon Obs. and Sabino Canyon Obs., and was announced in MPEC 2004-H34 of 20 April. This object was also observed on 20 and 22 April by LINEAR, on 21 April by KLENOT, on 23 April by Great Shefford Obs., and on 24 April by Consell Obs.
2004 HG12
Apollo
135 m/yd21.9922.422.9 2004-H470.02566 AU
NEW: 2004 HG12 was discovered on 21 April by LINEAR, was confirmed on 21 April by Great Shefford Obs., and on 22 April by Sabino Canyon Obs., and was announced in MPEC 2004-H47 of 22 April. This object was also observed on 21 April by KLENOT and on 22 April by LINEAR and Great Shefford Obs.
2004 EK1
Apollo
140 m/yd21.9222.122.1 2004-E480.03503 AUNecessary, visibility ends 13 May
2004 EK1 was observed on 16 April by Carl Hergenrother from Whipple Obs. and on 20 April by Jornada Obs.

  Small object observation cross index   [table top]
ObjectObserved by MPC code
2002 CV11644
2002 VO69644
2002 VS85644
2004 BW18413
2004 EK1696 & 715
2004 FB18413
2004 FH29413
2004 FP4413 & 704
2004 GB19246, 587, 704, 715, 926, E14 & J95
2004 GC19246, 926 & J95
2004 GD246, 587, 683 & J95
2004 GD2704, E14 & J95
2004 GZ14246 & J95
2004 HB474
2004 HC33291, 651, 691, 704, 926 & J95
2004 HD176, 474, 704, 859, 926 & E14
2004 HE474
2004 HG12246, 704, 854 & J95
2004 HH20474, 704 & J95
2004 HM170, 176, 246, 587, 703, 859, 941, H36 & J95
2004 HQ1176, 246, 704 & J95
2004 HT38176, 448, 474, 704, 854 & J95
2004 HZ176, 246, 448, 620, 704, 854 & J95
CodeObservatoryObjects observed (days)
170Begues Obs.2004 HM(3)
176Consell Obs.2004 HD, 2004 HM, 2004 HQ1, 2004 HT38 & 2004 HZ
246KLENOT2004 GB19, 2004 GC19, 2004 GD, 2004 GZ14, 2004 HG12, 2004 HM, 2004 HQ1 & 2004 HZ
291Spacewatch 1.8m telescope2004 HC33
413Australian Natl. Univ. (ANU) Obs. 1.0m telescope2004 BW18, 2004 FB18, 2004 FH29 & 2004 FP4
448Desert Moon Obs.2004 HT38 & 2004 HZ
474Mt. John Obs.2004 HB, 2004 HD, 2004 HE, 2004 HH20(2) & 2004 HT38
587Sormano Obs.2004 GB19, 2004 GD & 2004 HM
620Obs. Astron. de Mallorca2004 HZ
644NEAT/Palomar2002 CV11, 2002 VO69 & 2002 VS85
651Grasslands Obs.2004 HC33
683Goodricke-Pigott Obs.2004 GD(2)
691Spacewatch 0.9m telescope2004 HC33
696Whipple Obs.2004 EK1
703Catalina Sky Survey (CSS)2004 HM
704LINEAR2004 FP4(3), 2004 GB19, 2004 GD2(2), 2004 HC33, 2004 HD(2), 2004 HG12(2), 2004 HH20(3), 2004 HQ1(2), 2004 HT38 & 2004 HZ(3)
715Jornada Obs.2004 EK1 & 2004 GB19
854Sabino Canyon Obs.2004 HG12, 2004 HT38 & 2004 HZ
859Wykrota Obs.2004 HD & 2004 HM
926Tenagra II Obs.2004 GB19, 2004 GC19, 2004 HC33 & 2004 HD
941Pla D'Arguines Obs.2004 HM
E14Hunters Hill Obs.2004 GB19(2), 2004 GD2 & 2004 HD(4)
H36Sandlot Obs.2004 HM
J95Great Shefford Obs.2004 GB19, 2004 GC19(5), 2004 GD, 2004 GD2(2), 2004 GZ14, 2004 HC33(2), 2004 HG12(2), 2004 HH20(2), 2004 HM(2), 2004 HQ1(4), 2004 HT38 & 2004 HZ
Risk monitoring - panel 1/2 Major News for 25 April 2004 back top next  
Risk monitoring 25 April

The Sunday Daily Orbit Update MPEC (DOU) includes positions for 2004 HD2 from Mt. John Observatory in New Zealand yesterday, and this object, which was removed two days ago, is now back on the JPL Current Impact Risks page with one low-rated impact solution beyond the NEODyS 2080 time horizon. (Yesterday's DOU had 2004 HD2 observations from LINEAR in New Mexico from the 22nd and 23rd.)

Today's DOU doesn't report new data for 2004 HK33, which JPL posted yesterday evening in Pasadena, after midnight UT, and which NEODyS posted early this evening in Pisa.

Only JPL has had 2004 HF12 listed, and today removed it after observations from Consell and Great Shefford observatories last night in Europe.

Another JPL-only listing, 2004 HM is in the DOU from Begues Observatory in Spain and Consell, and today JPL slightly lowered its low risk assessment for this small object that is today's "cover" subject above.

more risk monitoring >>

Summary Risk Table - sources checked at 0151 UTC, 26 Apr

Object

Assessment

Years

VI
PS
cum
PS
max
T
S
Arc 
days
 2004 HZ NEODyS 4/252020-207729-2.61-2.7205.721
JPL 4/252023-209121-2.67-2.7805.721
 2004 HW NEODyS 4/242023-20803-5.31-5.3504.734
JPL 4/24R E M O V E D
 2004 HQ1 NEODyS 4/252065-20807-6.27-6.5305.784
JPL 4/252065-21019-5.19-5.3105.784
 2004 HMJPL 4/252104-21041-5.41-5.4108.687
 2004 HK33 NEODyS 4/252010-206813-2.67-3.1403.012
JPL 4/252010-210345-2.38-3.0603.012
 2004 HF12JPL 4/25R E M O V E D
 2004 HE12 NEODyS 4/242013-207923-3.76-4.0602.999
JPL 4/242015-209628-3.98-4.3202.999
 2004 HD2JPL 4/252087-20871-5.56-5.5604.124
 2004 GE2JPL 4/242100-21001-6.02-6.02011.811
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.
Risk monitoring - panel 2/2 Major News for 25 April 2004 back top next  

<< continued from panel 1

Consell also reported 2004 HZ and 2004 HQ1 from last night. Today both risk monitors further cut their counts of impact solutions for 2004 HZ but slightly raised their overall risk ratings for it. 2004 HQ1's low ratings had only small changes, and moved slightly lower at NEODyS.

Missing from the DOU, besides 2004 HK33, are active concerns 2004 GE2, 2004 HE12, and 2004 HW. At just before 2200 UT, the Minor Planet Center Last Observation page is showing that 2004 HK33 was caught this morning by Wykrota Observatory in Brazil. 2004 GE2's visibility ends in two days, according to the European Spaceguard Central Node Priority List, which, at last check today, doesn't presently list any of the other seven objects with impact solutions that have been in recent view.

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