[Asteroidal Occultation] Observational Results from 2012 (actually, since 2011 July 18) 2012 October...
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Transcript of [Asteroidal Occultation] Observational Results from 2012 (actually, since 2011 July 18) 2012 October...
[Asteroidal Occultation] Observational Results from 2012
(actually, since 2011 July 18)
2012 October 19
IOTA meeting, Las Vegas, Nevada
David W. Dunham
Occultation of LQ Aquarii on 2011 July 19
mapped the profileof the binary asteroid (90) Antiope
David W. Dunham,
International Occultation Timing Association
and KinetX, and many others, from IOTA,
IMCCE (Paris Observatory), the SETI Institute,
Southwest Research Institute, JPL, Sierra College,
etc.
Predicted Path of theOccultation of the6.7-mag. Star by(90) Antiope
The path over northern Calif. & Nevada
IOTA meeting at Sierra College, Rocklin, CA
One of the pre-point charts prepared for the 50mm binocular lens-based “mighty mini” systems
LQ
70
Hydor
tau
69
74
sigma
54psi
phi
chi
Situla
MOON
rho Ancha
Skat77
37KR
36
iota
66
68
58
94
97
Pre-point line of
declination (UT)
5Circle
Setting up a mighty mini at my station #5 in Newman, Calif.
Light curve of the occultation atDunham Station #1 west of Tracy, Calif.
The angular diameter of the red giant star caused the disappearance andreappearance to be gradual over several tenths of a second, with differentdurations at the two events due to different slopes of the asteroid’s surface
Preliminary Sky-plane Profile
Occultation of 8.9-mag. SAO 95144 by (360) Carlova in Carolinas Aug. 15
• Bill Keel recorded a central occultation, 3.3s long, at Univ. of AL, Tuscaloosa
• He was near the northern limit, showing that the path shifted ½ path-width north
• Scotty Degenhardt ran 7 stations, mostly in the s. part of the path in s.e. AL
• His 2 northern stations, n. of center, had short occultations; the others had misses
David Dunham’s stations for the Carlova occ’n
The scope symbols show some of the stations that I planned to set up, but it was very cloudy along I-26 . When I reached Spartanburg, SC, I decided to go west on I-85, and found clear sky at Greenville. From there, I deployed 5 stations south near US25, shown by green dots.
My stations bracketing the predicted n. limit (the blue line) all were in the actual occultation path. In addition, I ran a 6th station much farther north, at a friend’s place in Hendersonville, NC, but unfortunately the digital recorder there did not write to the SD card correctly, only junk.
All stations for the Carlova occ’n
Carlova Occultation profile with best-fit ellipse
Carlova Shape Model Fit
Occult Watcher Ginevra Plan
To Oklahoma for Ginevra
Lavonne Occult profileObserversOf the GinevraOccultation,Sept. 27, 2011
Arachne OW stations 3-9
3
9
ErnieIverson’sLine(cloudy)
Arachne OW stations 1 & 2 (cloudy)
2
1
Not used
Arachne Sta. 3, Foster Cemetery
Sky-Plane Plot
Limovie Lightcurve for my Station #3at Foster Cemetery, e. of Huntsville, TX
Analyzed by Scotty Degenhardt
Occultation of SAO 60804, mag. 8.0, by the Trojan Asteroid
(911) Agamemnon Thurs. morning, 2012 January 19
This is the best, most valuable asteroidal occultation over the MD/greater Washington, DC region this year
We need your help to observe it
Following are maps of the path, and several star charts to locate the star in obscure Lynx;
Pre-pointing may be needed by most to find the star
= SAO 138052,spec. type K0
In coastal Mid-Atlanticregion (DC, Philadel-
phia, Richmond, etc.),Star alt. 24 in az. 299(northwest, opposite
Sun, whose alt. will be -10)
Occultation in Mid-Atlanticregion at 11:31:40 UT 11s(6:31am & 40s EST)
View of the Earthas seen from
(911) Agamemnon
Finder chart, 2 on a side
Map of 2012 Jan. 19th Agamemnon occ’n observers
Dunham-4 Dunham-3
Dunham-1
Conard
Tolea Brooks
Green dots mark positive observations, while red (Brooks) indicates a miss (negative, no occ’n).The green line is the predicted central line while the blue lines are the predicted path limits.The gray lines mark a 10-km zone bracketing Conard’s location where the satellite occ’n occurred.
Dunhamran a 2nd
station between#1 and #3but the videorecorderat #2failed.
Steve Conard’s light curve of the Jan. 19th Agamemnon occultation
Sky-plane plot, 2012 Jan. 19th (911) Agamemnon occultation
23
6
4
8
9
100 km
Satellite
Agamemnon: Axes 190.6 0.9 by 143.8 1.5 km, PA minor axis -69.3 1.3, center X 4661.6 0.4 km, Y 3113.7 0.6 km; disappearances on right sideSatellite plotted as 9-km circle (but it’s more likely about 4 km across) 0.0931 (278 km in the plane) from Agamemnon’s center in PA 93.8
Occ’n of BN Orionis by (57) Melpomene, 2012 March 11, path
Occ’n of BN Orionis by (57) Melpomene, 2012 March 11, stations
Occ’n of BN Orionis by (57) Melpomene, 2012 March 11