Short Jarnefelt occultation timed in Topeka March 27
Updated: 2001 March 28
The below is another confirmation of Federspiel's and Preston's
predictions, better than expected, within a path-width.
This was a grazing occultation, and apparently at least two
occultations of the star by features on the asteroid occurred.
There have been several similar reports for other asteroidal
occultations.
- David Dunham, IOTA
__________________________________________________________________
Subject: 1558 Jarnefelt Mar. 27th occ'n final report
Date: Sat, 31 Mar 2001 21:38:52 -0600
To: Dunham@erols.com
From: Wilds
Hi Dave: Just a second copy to make sure you got it. Please notice that
we have some interesting event action just before the main event, but the
seeing made certainty very difficult. However, the number of quick events
just before the main event does make one suppect that they may be real.
Therefore, we put them in with comments to cover our concerns. Your
comments that they may be the result of a graze experience along the
northern edge of the asteroid were taken as the most probable arguement.
Thank You!
IOTA ASTEROIDAL OCCULTATION REPORT FORM
Asteroid (or other object):_1558 Jarnefelt__ Star:PPM 160656=HIP 70660_____
Date (U.T.):_27 March 2001____________ Predicted Time (U.T.):_05:58:04UT___
Richard P. Wilds, Heartland Astronomical Research Team
Observer Name:__Craig McManus, Rex Easton__ Telephone:_(785)478-1868_______
Postal Address:_7328 SW 23rd Terrace, Topeka, Kansas 66614-6060 USA__________
E-mail Address:_Wilds@networksplus.net__________ Fax:______________________
TELESCOPE: Aperture:_18 CM_ Focal length:162CM_ Type:_Refractor__________
Used Image intensified CCD Video yielding 13th magnitude in a 1 degree field.
Eyepiece Power:________ Observing site name: Topeka, Kansas____________
Longitude:_95d 47m 37.3s_(W)______ Latitude:_39d 01m 25.4s_(N)_________
Height above sealevel:_315(M)_ How determined?:_GPS_____________________
Sky Transparency (Circle one, or delete two): Good
Star Image Stability ("seeing"; as above): Fair
Other Conditions: (Wind, Clouds, Lights, etc.):_______City Lights__________
EVENT TIMINGS: (All times in Universal Time)
Time Source:GPS Time Insertion WWV 5.0 Recording method:_VHS VCR___________
Was the Asteroid Visible in your Scope? __No__ Approx. Limiting Mag.:_13___
Universal Time Estimated Accuracy, Remarks
h m s Reaction
Time,
Started Observing: _05:_50:_00.00_ (sec.) ____________________
Star and Object Merged: ___:___:___.___ ____________________
Observed BLINK at (D at 58:01.12 and R at 58:01.15) Quick & Uncertain.
Observed BLINK at (D at 58:01.78 and R at 58:01.82) Quick & Uncertain.
Observed Fade Out at 58:02.18 and Fade In at 58:02.20 Fair seeing made the
certainty of the observation unsure.
Disappearance: _05:_58:_02.23_ __.___ ____________________
Estimated Closest Approach: _____________________________________________
(if no D/R)
Reappearance: _05:_58:_04.55_ __.___ Began Fade 58:04.48_
Star and Object Separated: ___:___:___.___ ____________________
Stopped Observing: _06:_05:_00.00_ ____________________
Was your reaction time applied to the above timings? _No______
If you could tell, did the object pass NORTH, SOUTH, EAST, or WEST of the
star (cicle one, or delete three)? If possible,
estimate the distance of closest approach in arc seconds: _______
Additional comments: _Both "D" and "R" were observed as fade events lasting
~0.05 seconds. The time inserter is accurate to 0.03 seconds. Fair
seeing made timing and certainty of the quick events a difficult task.
Send Jan Manek Fax: +420-2-61216822
report to: Stefanik Observatory E-mail: jmanek@mbox.vol.cz
Petrin 205 If an occultation is timed, copy to:
118 46 Praha 1 dunham@erols.com
Czech Republic
------
"...indeed the business of the universe is to make such a fool of you that
you will know yourself for one, and so begin to be wise!" Quote of Mr.
Raven(The Librarian, The Sexton or Adam) from Lilith, by George MacDonald.
Richard and Tatyana Wilds
7328 SW 23rd Terrace
Topeka, Kansas 66614-6060 USA
(785)478-1868 Home
(785)575-6910 Work
E-mail: Wilds@networksplus.net Home
rwilds@topeka.k12.ks.us Work
Observatory Director,
Kansas Flint Hills Observatory Complex
A Tech
629 SE Quincy, Suite 204
Topeka, Kansas 66603-3927 USA
Research Coordinator,
Heartland Astronomical Research Team--HART
P.O. Box 3938
Topeka, Kansas 66604-6938 USA
WWW: http://www.skygazer.org/hart/
Writer for Grazing Occultation Services,
International Occultation Timing Association--IOTA
2760 SW Jewell Ave
Topeka, Kansas 66611-1614 USA
E-Mail: IOTA@inlandnet.net
WWW: http://www.occultations.org
American Astronomical Society
WWW: http://www.aas.org/
Planetary Sciences Division
WWW: http://www.aas.org/~dps/dps.html
Historical Astronomy Division
WWW: http://www.aas.org/divisions/had.html