Sunday16 May 20046:44pm MDT2004-05-17 UTC 0044 back top next  

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


Today's issue status: done
yesterdayMayTuesdayIndex

Cover: One of this past week's first newly announced small objects, 2004 JP1, is seen here in confirmation imagery from Robert Hutsebaut in Belgium operating a telescope at New Mexico Skies. This is a stack of four 20-second exposures.

Small objects – panel 1/2 Major News for 16 May 2004 back top next  

Small objects
Discovery & follow-up 10-16 May

That it is difficult to follow small near-Earth asteroids is evident from today's news. Only three objects of active concern are left on the risk monitors' pages, and all three are small. And, between Minor Planet Center and JPL current listings, today there are 561 objects with absolute magnitude H>22.0 (estimated at 135 meters wide or less), and only one is numbered.

Nineteen observatories participated in this past week's work. Seven discoveries of small asteroids were announced, another three small asteroids were tracked, and tracking of four more was reported from earlier. Four of the discoveries were made with the LINEAR facility at White Sands in New Mexico run from Massachusetts. And three were made with the Spacewatch 0.9m telescope in Arizona. One of these was by veteran asteroid hunter Jim Scotti at the observatory on Kitt Peak, and two were by volunteers in the Spacewatch FMO Project — Lisa Turner in Texas and Franco Mallia in Italy, who reviewed images over the Internet

Last Sunday's small objects report ended with the note that no close Earth flybys by small objects were predicted "for the next month and a half." Well, 2004 JO12 flew past at 13.1 lunar distances (LD) three days later, but two days before discovery. And 2004 JO20 and 2004 JP1 will respectively fly past at 3.2 LD tomorrow and 3.0 LD Tuesday.

<< 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 16 May 2004 back top next  

Small object observation summary for 10-16 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 JO20
Apollo
22 m/yd25.9325.925.9 2004-K010.00753 AU
NEW: 2004 JO20 was discovered on 15 May by LINEAR, was confirmed on 15 May by Great Shefford Obs., Obs. Astronomico de Mallorca (OAM), and Pla D'Arguines Obs., and was announced in MPEC 2004-K01 of 16 May. It will fly past Earth at 3.2 lunar distances (LD) on 17 May.
2004 JU20
Amor
29 m/yd25.3225.325.3 2004-K030.09799 AU
NEW: 2004 JU20 was discovered on 13 May by Jim Scotti with the Spacewatch 0.9m telescope, was confirmed on 14 and 16 May with the Spacewatch 1.8m telescope, and was announced in MPEC 2004-K03 of 16 May.
2004 JO12
Amor
62 m/yd23.6923.523.8 2004-J640.03310 AU
NEW: 2004 JO12 was discovered on 14 May by FMO Project online volunteer Lisa Turner while reviewing images from the Spacewatch 0.9m telescope (see report), was confirmed on 14 May by Great Shefford Obs. (see "cover" image) and OAM, and on 15 May by Modra Obs. and Great Shefford, and was announced in MPEC 2004-J64 of 15 May. This object was also observed on 15 May by Pla D'Arguines Obs. and on 15 and 16 May by Great Shefford. It flew past Earth at 13.1 LD on 12 May.
2004 JV20
Apollo
64 m/yd23.6323.723.7 2004-K040.03725 AU
NEW: 2004 JV20 was discovered on 15 May by LINEAR, was confirmed on 15 May by Great Shefford Obs., and on 16 May by Tenagra II Obs. and LINEAR, and was announced in MPEC 2004-K04 of 16 May. It will fly past Earth at 16.5 LD on 17 May.
2004 JP12
Apollo
66 m/yd23.5523.823.8 2004-J670.02800 AU
NEW: 2004 JP12 was discovered on 13 May by FMOP online volunteer Franco Mallia while reviewing images from the Spacewatch 0.9m telescope, was confirmed on 14 May with the Spacewatch 1.8m telescope and by Great Shefford Obs., and on 15 May with the Spacewatch 1.8m telescope, and was announced in MPEC 2004-J67 of 15 May (see report). This object, which was also observed on 15 May by Great Shefford, has an MOID of 0.035 AU with Venus.
2004 HQ1
Apollo
has VIs
78 m/yd23.2023.123.0 2004-H380.00229 AUNecessary, visibility ends 3 Jun.
2004 HQ1 was reported this last week as observed on 8 May by David Tholen's team with the Univ. of Hawaii 2.2m Telescope.
2004 HM
Apollo
has VIs
83 m/yd23.0623.223.3 2004-H250.00338 AUNecessary, visibility ends 22 May
2004 HM was observed on 9 and 13 May with the Spacewatch 1.8m telescope.
2004 JN1
Apollo
87 m/yd22.9623.623.6 2004-J480.02337 AUNecessary, visibility ends 13 Jul.
NEW: 2004 JN1 was discovered on 11 May by LINEAR, was confirmed on 11 May by KLENOT, and on 12 May by Table Mountain Obs. and Sabino Canyon Obs., and was announced in MPEC 2004-J48 of 12 May. This object was also observed on 12 May by LINEAR and on 14 May by Tenagra II Obs. and Consell Obs.
2004 GB19
Apollo
89 m/yd22.8923.022.7 2004-H040.01060 AUUrgent, visibility ends 25 May
2004 GB19 was reported this last week as observed on 6 May with the Australian Natl. Univ. (ANU) Obs.1.0m telescope. It has an MOID of 0.011 AU with Mars.
2004 JB
Amor
97 m/yd22.7122.622.7 2004-J300.19533 AUNecessary, visibility ends 11 Jun.
2004 JB was observed on 10 May by Tenagra II Obs. and on 12 May by KLENOT.
2004 HB39
Amor
98 m/yd22.6922.722.5 2004-H740.09356 AUUseful, visibility ends 17 Aug.
2004 HB39 was observed on 10 May by Tenagra II Obs.
2004 JP1
Apollo
117 m/yd22.3022.522.4 2004-J500.00563 AUUrgent, visibility ends 28 May
NEW: 2004 JP1 was discovered on 11 May by LINEAR, was confirmed on 11 May by KLENOT, and on 12 May by Table Mountain Obs., Robert Hutsebaut via New Mexico Skies (see "cover" image above), Cordell-Lorenz Obs., Francisquito Obs., and Sabino Canyon Obs., and was announced in MPEC 2004-J50 of 12 May. This object was also observed on 12 May by LINEAR, Great Shefford, and Linhaceira Obs., on 14 May by Great Shefford and Montelupo Obs., on 15 May by Farpoint Obs. and Begues Obs., and on 16 May by Great Shefford Obs. It will fly past Earth at 3.0 LD on 18 May.
2004 HZ
Apollo
has VIs
121 m/yd22.2422.922.8 2004-H340.00002 AU
2004 HZ was reported this last week as observed on 7 May with the UH 2.2m Telescope.
2004 HS56
Amor
125 m/yd22.1622.422.0 2004-H830.03050 AUNecessary, visibility ends 26 May
2004 HS56 was reported this last week as observed on 28 April by Hadano Obs. and Bisei Spaceguard Center and on 6 May with the ANU 1.0m telescope.

  Small object observation cross index   [table top]
ObjectObserved by MPC code
2004 GB19413
2004 HB39926
2004 HM291
2004 HQ1568
2004 HS56300, 355 & 413
2004 HZ568
2004 JB246 & 926
2004 JN1176, 246, 673, 704, 854 & 926
2004 JO12118, 620, 691, 941 & J95
2004 JO20620, 704, 941 & J95
2004 JP1108, 170, 246, 673, 704, 734, 850, 854, 938, G70, H06 & J95
2004 JP12291, 691 & J95
2004 JU20291 & 691
2004 JV20704, 926 & J95
CodeObservatoryObjects observed (days)
108Montelupo Obs.2004 JP1
118Modra Obs.2004 JO12
170Begues Obs.2004 JP1
176Consell Obs.2004 JN1
246KLENOT2004 JB, 2004 JN1 & 2004 JP1
291Spacewatch 1.8m telescope2004 HM(2), 2004 JP12(2) & 2004 JU20(2)
300Bisei Spaceguard Center2004 HS56
355Hadano Obs.2004 HS56
413Australian Natl. Univ.
Obs. 1.0m telescope
2004 GB19 & 2004 HS56
568Univ. of Hawaii 2.2m Telescope2004 HQ1 & 2004 HZ
620Obs. Astron. de Mallorca2004 JO12 & 2004 JO20
673Table Mountain Obs.2004 JN1 & 2004 JP1
691Spacewatch 0.9m telescope2004 JO12, 2004 JP12 & 2004 JU20
704LINEAR2004 JN1(2), 2004 JO20, 2004 JP1(2) & 2004 JV20(2)
734Farpoint Obs.2004 JP1
850Cordell-Lorenz Obs.2004 JP1
854Sabino Canyon Obs.2004 JN1 & 2004 JP1
926Tenagra II Obs.2004 HB39, 2004 JB, 2004 JN1 & 2004 JV20
938Linhaceira Obs.2004 JP1
941Pla D'Arguines Obs.2004 JO12 & 2004 JO20
G70Francisquito Obs.2004 JP1
H06Robt. Hutsebaut/N.M. Skies2004 JP1
J95Great Shefford Obs.2004 JO12(4), 2004 JO20, 2004 JP1(3), 2004 JP12(2) & 2004 JV20
Risk monitoring - panel 1/1 Major News for 16 May 2004 back top next  
Risk monitoring Saturday 16 May Tuesday

None of the three objects recently in view that have impact solutions are reported in the Sunday Daily Orbit Update MPEC. All three are small objects (estimated at 120 or 80 meters/yards wide), and two are shown by the European Spaceguard Central Node Priority List to still be visible, 2004 HM until May 22nd and 2004 HQ1 until June 3rd.

The Minor Planet Center Last Observation is showing that 2004 HM was caught this morning with the Spacewatch 1.8m telescope in Arizona.

Summary Risk Table - sources checked at 0000 UTC, 17 May

Object

Assessment

Years

VI
PS
cum
PS
max
T
S
Arc 
days
 2004 HZNEODyS 5/14R E M O V E D
JPL 5/142023-20231-4.69-4.69018.114
 2004 HQ1 NEODyS 5/112079-20791-6.85-6.85019.218
JPL 5/3R E M O V E D
 2004 HMJPL 5/142104-21041-7.25-7.25026.957
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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