Sunday30 May 20046:27pm MDT2004-05-31 UTC 0027 back top next  

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


Today's issue status: done, updated
yesterdayMaytomorrowIndex

Cover: Small object 2004 JO20 from Peter Birtwhistle in England May 15th corresponding to the fourth of five confirmation positions he reported from a search process described with last Sunday's "cover."

Details: 2004 JO20. 2004 May 15 2156-2201 UT. Mag +18.1. 15x6 sec exposures (total expsoure 1m30s). Binned 2x2 and enlarged x2. Motion 41"/min in p.a. 1°. Field 10'x10', N up. 0.30m f/6.3 Schmidt-Cassegrain + CCD. P. Birtwhistle, J95

Small objects – panel 1/2 Major News for 24 May 2004 back top next  

Small objects
Discovery & follow-up for 24-30 May

This last week was a light one for observing asteroids of any size and especially the smallest, those with magnitude (brightness) of H greater than 22.0. In the northern hemisphere, where most asteroid observing is done, nights are becoming shorter. The Moon was brightening but was a week away from full. Weather interfered some in Europe and also across the southwestern U.S., where Arizona wildfire smoke hampered seeing. And many European NEO observers were at MACE 2004 from Thursday through today.

It was a week in which ground-based discoveries were announced for two comets and only seven near-Earth asteroids. Two of those five have H>22.0. 2004 KF17 was announced early today and will pass at 1.8 lunar distances (LD) at 2110 UT tomorrow. 2004 KG17, announced late today, was caught early Friday by the FMO Project (see news), and the preliminary calculation has its flyby at 5.1 LD just after 2000 UT that day. No other close flybys were known to have happened last week or are predicted for the coming

week or month. Thirteen observing facilities took part in the week's work, notably Tenagra II Observatory in Arizona (which closes July 1st until September).

Finally, a discovery from the previous week, 2004 KE1, had its magnitude recalculated to H>22.0 when its observing arc was expanded by 30 days.

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

Notes: 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). To be discovered and tracked, such objects must usually come close, and a few of them are Earth's nearest neighbors, coming closer than the Moon itself. They are exposed samplings of distant asteroid populations, and they have within their own population tomorrow's meteors. Diameter & Earth MOID: In the following observation summary table, the stated diameters are rough best estimates from a standard but very inexact H-to-size formula using H (absolute magnitude, or brightness) from the JPL NEO Orbital Elements page, source also for Earth MOID (minimum orbital intersection distance). Current Minor Planet Center H is also given, along with the original H from each object's discovery MPEC. Other sources: Planetary MOIDs are from Lowell Observatory. Priorities and visibilities are from the European Spaceguard Central Node (SCN). And flyby distances and times are from the JPL Close Approach Table.
Small objects – panel 2/2 (table) Major News for 24 May 2004 back top next  

Small object observation summary for 24-30 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.


Object
Estimated
diameter
JPL
H
MPC
H
Discovery
H in MPEC
Earth
MOID
European Spaceguard Central Node
priority/visibility/campaign
2004 KG17
Amor
14 m/yd26.9627.027.0 2004-K750.01156 AU
NEW: 2004 KG17 was discovered early on 28 May by FMO Project online volunteer A.B. Marais while reviewing images from the Spacewatch 0.9m telescope (see A/CC news about SW40Dl). JPL's preliminary calculation has it flying past Earth at about 5.1 lunar distances (LD) later that same day, at 2010 UT +/- 6 minutes. It was confirmed on 29 and 30 May by the Spacewatch 1.8m telescope and on 30 May by Tenagra II Observatory, and was announced in MPEC 2004-K75 of late 30 May.
2004 KF17
Apollo
33 m/yd25.0425.425.4 2004-K730.00458 AU
NEW: 2004 KF17 was discovered on 28 May by LINEAR, was confirmed on 29 May by LINEAR and Tentlingen Observatory, and was announced in MPEC 2004-K73 of 30 May. It will fly past Earth at 1.8 LD at 2110 UT 31 May.
2004 KG1
Aten
53 m/yd24.0424.123.7 2004-K270.00355 AUNecessary, visibility ends 18 June
2004 KG1 was observed on 23 May by Wykrota, Sormano, Tentlingen, and Tenagra II observatories, on 24 May by Tenagra II, San Marcello Pistoiese, Jurassien-Vicques, and Naef observatories, on 25 May by Tentlingen and Mt. John observatories, on 28 May by Desert Moon Observatory, and on 29 May by Tenagra II.
2004 KN10
Amor
61 m/yd23.7223.723.5 2004-K450.10138 AUUrgent, visibility ends 15 July
2004 KN10 was observed on 24 May by Tenagra II.
2004 FB18
Amor
63 m/yd23.6524.023.5 2004-F760.05859 AUNecessary, visibility ends 15 June
2004 FB18 was observed on 24 May by Tim Spahr at Whipple Observatory.
2004 JN1
Apollo
70 m/yd23.4123.723.6 2004-J480.02339 AUUseful, visibility ends 13 July
2004 JN1 was observed on 23, 24, and 28 May by Tenagra II.
2004 HB39
Amor
98 m/yd22.6922.722.5 2004-H740.09356 AUUseful, visibility ends 17 Aug.
2004 HB39 was observed on 24 May by Tim Spahr at Whipple Observatory.
2004 KE1
Amor
133 m/yd22.0322.021.7 2004-K280.07248 AUNecessary, visibility ends 21 Nov.
NEW: 2004 KE1 was reclassified as a small object on May 25th when it was reported that it had been found in images from the Spacewatch 0.9m telescope from 21 and 28 April, and had been further observed by Tenagra II on May 23rd, which together boosted the observing arc from 1.021 to 31.815 days. 2004 KE1 was discovered 19 May by Jeff Larsen with the Spacewatch 0.9m telescope, was confirmed on 19 May by KLENOT and on 20 May with the Spacewatch 0.9m telescope and by Tenagra II, and was announced in MPEC 2004-K28 of 20 May.

  Small object observation cross index   [table top]
ObjectObserved by MPC code
2004 FB18696
2004 HB39696
2004 JN1926
2004 KE1246, 691 & 926
2004 KF17704 & A16
2004 KG1104, 185, 448, 474, 587, 859, 926, A13 & A16
2004 KG17291, 691 & 926
2004 KN10926
CodeObservatoryObjects observed (days)
104San Marcello Pistoiese Obs.2004 KG1
185Jurassien-Vicques Obs.2004 KG1
246KLENOT2004 KE1
291Spacewatch 1.8m telescope2004 KG17(2)
448Desert Moon Obs.2004 KG1
474Mt. John Obs.2004 KG1
587Sormano Obs.2004 KG1
691Spacewatch 0.9m telescope2004 KE1(4) & 2004 KG17
696Tim Spahr/Whipple Obs.2004 FB18 & 2004 HB39
704LINEAR2004 KF17(2)
859Wykrota Obs.2004 KG1
926Tenagra II Obs.2004 JN1(3), 2004 KE1(2), 2004 KG1(3), 2004 KN10(2) & 2004 KG17
A13Naef Obs.2004 KG1
A16Tentlingen Obs.2004 KF17 & 2004 KG1(2)
Risk monitoring - panel 1/1 Major News for 30 May 2004 back top next  
Risk monitoring 30 May

(There was no risk monitoring news to report today.)

Summary Risk Table - sources checked at 0004 UTC, 31 May

Object

Assessment

Years

VI
PS
cum
PS
max
T
S
Arc 
days
 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.
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