Sunday23 May 200411:11pm MDT2004-05-24 UTC 0511 back top next  

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

Today's issue status: done

Cover: Small object 2004 JO20 confirmation imagery from Great Shefford Observatory in England May 15th.

Cover story by Peter Birtwhistle: On the night of May 15th, the indicated uncertainty area for LINEAR discovery AN87082 on the NEO Confirmation Page (NEOCP) was 2°x0.5°. The mosaic here shows how my search managed to record it on three separate search fields. While the object moved swiftly northward, my searches went from one side of it to the other. I took the first set of 45 frames and, while I was checking those, started the second set. I located the object on the first set and therefore cut the second set off, only doing 32 of the planned 45 frames there. And I finally took the third set to just be absolutely sure I had it.
      Frame 1 (at bottom) was centered on the nominal ephemeris position, frame 2 (middle) was centered on variant orbit 21, and frame 3 (after the object had been found on frame 1) was centered on variant orbit 32.

Details: All 2004 May 15. Binned 2x2. Motion 41"/min in p.a. 1°. Orginal field in each frame 25'x25', N up. 0.30m f/6.3 Schmidt-Cassegrain + CCD. P. Birtwhistle, J95. Frame 1 – 2117-2133 UT, 45x4 sec exposures (total exposure 3m00s). Frame 2 – 2141-2153 UT, 32x6 sec exposures (total exposure 3m12s). Frame 3 – 2156-2212 UT, 45x6 sec exposures (total exposure 4m30s).
Small objects – panel 1/2 Major News for 23 May 2004 back top next  

Small objects
Discovery & follow-up 17-23 May

This past week, discoveries were announced for three small objects — asteroids with absolute magnitude H greater than 22.0, thus estimated at under roughly 135 meters/yards wide. During this period nine more were followed, and observations were also reported for another from back in early April.

Thirty-one observing facilities participated in the week's work. Two discoveries were from LINEAR in New Mexico and the other with the Spacewatch 0.9m telescope in Arizona. These three were among the five smallest tracked, probably under 65 meters wide.

Last Sunday's report noted that 2004 JO20 and 2004 JP1 would fly past Earth at just beyond three lunar distances (LD) on Monday and Tuesday. 2004 KG1 also flew past on Tuesday, at 6.7 LD the day before it was discovered. No small object close flybys are predicted for this coming week or any time soon.

<< 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). Flyby distances and times are from the JPL Close Approach Table.

Small objects – panel 2/2 (table) Major News for 23 May 2004 back top next  

Small object observation summary for 17-23 May

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 JO20
20 m/yd26.1526.225.9 2004-K010.00752 AU
2004 JO20 (see "cover" image above) was observed on 16 May by Tenagra II, Great Shefford, and San Marcello Pistoiese observatories, and on 17 May by Great Shefford and Tenagra II. It has an MOID of 0.033 AU with Mars. This object passed Earth at 3.2 LD May 17.5347 UT.
2004 KZ
25 m/yd25.6725.525.7 2004-K210.01232 AUUrgent, visibility ends 31 May
NEW: 2004 KZ was discovered on 18 May by LINEAR, was confirmed on both sides of midnight 18-19 May by Great Shefford Obs. and on 19 May by LINEAR, and was announced in MPEC 2004-K21 of 19 May. This object was also observed on 19 and 20 May by Tentlingen Obs. and on 20 May by Tenagra II Obs.
2004 KG1
54 m/yd24.0024.023.7 2004-K270.00355 AUNecessary, visibility ends 18 Jun.
NEW: 2004 KG1 was discovered on 19 May by LINEAR, was confirmed on 19 May by the Southern Sky Survey (SSS), and on 20 May by CINEOS, by Bill Ryan with the SMARTS 1m telescope at Cerro Tololo, and by Sabino Canyon Obs. (two sets 1.34 hours apart) and Tenagra II Obs., and was announced in MPEC 2004-K27 of 20 May. This object was also observed on 21 and 22 May by Great Shefford Obs. and on 22 May by Tenagra II Obs., by Robert Hutsebaut via New Mexico Skies, and by Powell Obs. and LINEAR. This object flew past Earth at 6.7 LD May 18.7743 UT.
2004 JV20
61 m/yd23.7224.023.7 2004-K040.03725 AUUrgent, visibility ends 25 May
2004 JV20 was observed on 17 May by Tenagra II Obs. This object passed Earth at 16.5 LD May 17.4965.
2004 KN10
62 m/yd23.6923.723.5 2004-K450.10186 AU
NEW: 2004 KN10 was discovered on 21 May by Jeff Larsen, who followed it over a 3.8-hour period with the Spacewatch 0.9m telescope. It was confirmed on 21 May by Bergisch Gladbach Obs., and on 23 May by Tenagra II Obs. and Three Buttes Obs., and was announced in MPEC 2004-K45 of 23 May. This object was also observed on 23 May by Grasslands Obs.
2004 JO12
63 m/yd23.6523.823.8 2004-J640.03310 AUNecessary, visibility ends 28 May
2004 JO12 was observed on 16-20 May by Tenagra II Obs., on 17-19, 22, and 23 May by Great Shefford Obs., and on 21 May by Desert Moon Obs.
2004 JP12
67 m/yd23.5123.423.8 2004-J670.02790 AUUrgent, visibility ends 25 May
2004 JP12 was observed on both sides of midnight 13-14 May by Obs. Astronomico de Mallorca (OAM) and on 20 May by Linz Obs. It has an MOID of 0.036 AU with Venus.
2004 JN1
73 m/yd23.3423.723.6 2004-J480.02333 AUUseful, visibility ends 13 Jul.
2004 JN1 was observed on 12 May by Herrenberg Obs., on 15 May by Powell Obs. and Bedoin Obs., on 16-18 and 20 May by Tenagra II Obs., on 20 May by KLENOT, and on 22 May by Pla D'Arguines Obs.
2004 HQ1
76 m/yd23.2423.123.0 2004-H380.00228 AUNecessary, visibility ends 3 Jun.
2004 HQ1 was observed on 19 May with the Spacewatch 1.8m telescope, and had its last impact solution removed on May 20th.
2004 HM
82 m/yd23.0923.223.3 2004-H250.00338 AU
2004 HM was observed on 16 May with the Spacewatch 1.8m telescope, and had its last impact solution removed on May 17th (see A/CC news).
2004 JB
99 m/yd22.6722.522.7 2004-J300.19458 AUUseful, visibility ends 11 Jun.
2004 JB was observed on 20 May by Tenagra II Obs.
2004 JP1
100 m/yd22.6522.822.4 2004-J500.00563 AUNecessary, visibility ends 28 May
2004 JP1 was observed on 13 May by Linhaceira Obs., on 15 May by Francisquito Obs., Montelupo Obs., and Vittore Obs., on 16 May by Tenagra II Obs., Tentlingen Obs., Great Shefford Obs., and San Marcello Pistoiese Obs., on 17 May by Great Shefford Obs., Tenagra II Obs., Sormano Obs., Linhaceira Obs., Buchloe Obs., and Village-Neuf Obs., and on 18 May by Tenagra II Obs. and Reedy Creek Obs. It was on A/CC news "covers" May 16th, 18th, and 19th. This object flew past Earth at 3.0 LD May 18.0069 UT.
2004 EH1
128 m/yd22.1122.422.3 2004-E460.03660 AU
2004 EH1 was reported this past week as observed on 8 and 9 April with the Australian Natl. Univ. (ANU) Obs. 1m telescope. This added 2.035 days to what had been a 24.189-day observing arc for this Catalina Sky Survey (CSS) discovery, which has been reported seen since April 1st only from the ANU 1m telescope.

  Small object observation cross index   [table top]
ObjectObserved by MPC code
2004 EH1413
2004 HM291
2004 HQ1291
2004 JB926
2004 JN1132, 240, 246, 649, 926 & 941
2004 JO12448, 926 & J95
2004 JO20104, 926 & J95
2004 JP1104, 108, 138, 215, 428, 552, 587, 926, 938, A16, G70 & J95
2004 JP12540 & 620
2004 JV20704 & 926
2004 KG1599, 649, 704, 807, 854, 926, E12, H06 & J95
2004 KN10621, 651, 691, 926 & G90
2004 KZ704, 926, A16 & J95
CodeObservatoryObjects observed (days)
104San Marcello Pistoiese Obs.2004 JO20 & 2004 JP1
108Montelupo Obs.2004 JP1
132Bedoin Obs.2004 JN1
138Village-Neuf Obs.2004 JP1
215Buchloe Obs.2004 JP1
240Herrenberg Obs.2004 JN1
246KLENOT2004 JN1
291Spacewatch 1.8m telescope2004 HM & 2004 HQ1
413Australian Natl. Univ. Obs. 1m telescope2004 EH1(2)
428Reedy Creek Obs.2004 JP1
448Desert Moon Obs.2004 JO12
540Linz Obs.2004 JP12
552Vittore Obs.2004 JP1
587Sormano Obs.2004 JP1
599CINEOS2004 KG1
620Obs. Astron. de Mallorca2004 JP12
621Bergisch Gladbach Obs.2004 KN10
649Powell Obs.2004 JN1 & 2004 KG1
651Grasslands Obs.2004 KN10
691Spacewatch 0.9m telescope2004 KN10
704LINEAR2004 JV20, 2004 KG1(2) & 2004 KZ(2)
807Bill Ryan/Cerro Tololo 1m2004 KG1
854Sabino Canyon Obs.2004 KG1
926Tenagra II Obs.2004 JB, 2004 JN1(4), 2004 JO12(5), 2004 JO20(2), 2004 JP1(3), 2004 JV20(2), 2004 KG1(2), 2004 KN10 & 2004 KZ
938Linhaceira Obs.2004 JP1(2)
941Pla D'Arguines Obs.2004 JN1
A16Tentlingen Obs.2004 JP1 & 2004 KZ(2)
E12Southern Sky Survey (SSS)2004 KG1
G70Francisquito Obs.2004 JP1
G90Three Buttes Obs.2004 KN10
H06Robt. Hutsebaut/NM Skies2004 KG1
J95Great Shefford Obs.2004 JO12(5), 2004 JO20(2), 2004 JP1(2), 2004 KG1(2) & 2004 KZ
News briefs – panel 1/1 Major News for 23 May 2004 back top next  
News briefs

Craters USA:  The Earth Impact Database currently lists 25 craters in the continental U.S. and one in Alaska. How many can you name without using a locator map? What probably comes to mind first is "Meteor Crater" in Arizona, more properly known as Barringer Crater. You might be surprised to learn that Illinois, Tennessee, and North Dakota each have two impact sites, and Texas three. Hidden in plain sight is Chesapeake Bay, which a Baltimore Sun article today describes as "largest of the 30 impact craters discovered in the United States and the sixth-largest [and maybe best-preserved] of 170 in the world." See more links about this in May 7th A/CC news.

A hiking story posted May 20th, "Rainy day in the desert," is a reminder of the less recognized but spectacular Upheaval Dome in Utah. About 250 miles (400 km.) due north of the much smaller Barringer Crater, it is located inside Canyonlands National Park (311Kb PDF trail map). See John Louie's pages to learn about the scientific research on this crater.

Risk monitoring - panel 1/1 Major News for 23 May 2004 back top next  
Risk monitoring 23 May

The Sunday Daily Orbit Update MPEC has observation of 2004 JA27 from LINEAR yesterday morning in New Mexico and from Great Shefford Observatory in England very early today UT. It is interesting to note that, during the 7.7 days from discovery May 15th until Great Shefford reported it this morning, the only observations of 2004 JA27 had come from LINEAR. Today NEODyS and JPL both removed all impact solutions for this object, which is roughly estimated at 835 meters/yards wide.

Summary Risk Table - sources checked at 0249 UTC, 24 May




 2004 JA27JPL 5/23R E M O V E D
NEODyS 5/23R E M O V E D
 2004 HZJPL 5/182023-20231-5.27-5.27018.114
NEODyS 5/14R 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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