2002/09/17 event : (345) Tercidina occults HIP 19388
Eric Frappa (updated : 2003
mar. 15)
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The predictions |
The star HIP 19388 = omega1 Tau = 43 Tau = BSC 1283 = SAO 93785 = PPM 119655 | |
- Magnitude V : 5.51 - Type : K2 III (orange-coloured giant star) - RA (2000) : 04 09 09.988 - Dec (2000) : 19 36 33.10 - Distance : 89 +/-7 parsecs (291 +/- 23 light years) Very easy to spot, at half-way between Hyades and Pleiades. | |
Observing station 30 km | |
The asteroid (345) Tercidina Discovered in 1892 november 23 by A. Charlois at Nice - Magnitude : 12.8 - Orbital period : 3.55 years - Type : C - Rotation period : 12.371 h - Estimated diameter : 100 +/-6 km | Situation at the moment of occultation (source : Orbits - NASA) |
Some positive recordings of the event | |
12.13s occultation - 42 km NNE of Dijon (FR) camcorder MiniDV Sony TRV15 (25 fr/s) + 80mm refractor (courtesy of C. Marlot) | 11.8s occultation - Tours (FR) Hisis22 + 500mm Maksutov lens (courtesy of P. Morel, SAF) |
10.96s occultation - 12 km SW of Langres (FR) PCV680K Vesta Pro webcam + 78mm refractor (movie and sequence : E. Frappa) | ||
Data reductions | |
Participation in this occultation was strong. Some people didn't hesitate to travel widely, crossing frontiers to join the occultation path. 105 known observers of 17 different countries have been involved in this event. 75 observers are involved in a positive observation (without timing for some of them) and 75 chords have been produced (by multiple methods for some observers). Employed instruments are going from simple 7x50 binoculars to 400mm reflector. Used methods are also of a large diversity : visual, video (low light video cameras, camcorders, webcam), CCD in drift scan mode, CCD trail, photographic trail. | |
Observers distribution Look at the excellent reliability of the prediction (figure : J. Lecacheux, Occult software map) | |
Reduction showing a wide field view of the raw data (with negative observations) 61 positive and 18 negative observations are represented here. Dotted lines are negative observations, continuous segments are positive ones (reduction and figure : J. Berthier - IMCCE) | |
Reduction of the raw observations (with WinOccult, Dave Herald's software) Each trail is one observation (star during time). The two continuous trails are negative observations, the others are interrupted by the star disappearance (red dots) and go on with the star reappearance (green dots) Only consistent raw observations (in absolute timing) are represented here (figure : E. Frappa) | |
Improvement of the asteroid outline Raw observations adjusted on a median occultation curve (fitted through the mid-chord positions) All known and usable chords are represented here (reduction and figure : J. Lecacheux) | |
(additional information is given by the light curve of the asteroid, visible on the Raoul Behrend page) | |
Go back to the 2002 results page
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