IOTA/IOTA-ES occultation update for
(308) Polyxo / HIP 57629 = SAO 138420 on November 15/16, 2004
visible from N Portugal, Spain, Mallorca, S Sardinia,
N Tunisia, S Sicilia and Malta
Summary
In the night of November 15/16, 2004 a bright 6.2 mag star HIP 57629 = SAO 138420 will be occulted by a 148 km asteroid (308) Polyxo. This update is based on USNO/Flagstaff and TMO astrometry for the asteroid and Hipparcos star position.
The updated path shows ~1 path width S shift with time ~0.3 minutes later compared to Edwin Goffin's nominal prediction.
Updated path runs over N Portugal ~5:16.3 UT, Spain ~5:16.4 UT, Mallorca ~5:16.5 UT, S Sardinia ~5:16.7 UT, N Tunisia ~5:16.8 UT, S Sicilia ~5:16.9 UT and Malta ~5:16.9 UT. Please check the path chart for details.
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Clear sky and good luck !!!
The event at one glimpse:
* date and approx. UT time of event: November 16, 2004 @ 05:17 UT (Europe)
* magnitude of target star: 6.2
* magnitude drop [mag]: 7.6
* estimated maximum duration [s]: 4.5
* approx. V mag of minor planet at event [mag]: 13.8
* geocentric parallax of minor planet ["]: 2.714
* apparent motion of minor planet ["/h]: 50.79
* angular distance to moon, phase of moon [deg,%]: 106, 18%
* Goffin's original chart reference: A04_1132
The occultation path with path maps:
* approximate ground width [km]: 160
* uncertainty [path widths]: 0.5
* uncertainty in time [s]: 4
* map: Overview
European part
* remarks: Path uncertainties [2 sigmas] are given according to nominal star
position errors and expected asteroid positional accuracy.
Elements for WinOccult - use 'Save as ...' to download and save these elements.
Finding charts (prepared in GUIDE8):
* occulted star is in center - labeled with cross
* labeled stars have indicated SAO numbers
* (smaller) square box shows 30' field in all wider field charts
* (larger) square box shows 3° field in wide field charts
* remarks:
Target star is in west Virgo, about 2.1 degrees SSW of 3.6 mag star beta Virginis = SAO 119076.
!!! IMPORTANT !!!
Purple stars in identification chart are so called 'non-star' objects in GSC; in dense fields
the 'non-stars' are often real stars or blends of close pairs. Be careful about this.
40-degree chart
3-degree chart
0.5-degree chart
Data for the target star:
* name: HIP 57629 = SAO 138420 = PPM 158259 = TYC 0273-00924-1
* constellation: Virgo
* J2000 position [h,m,s; o,',"]: 11h 49m 01.2164s; -00d 19' 07.203"
* position source: Hipparcos
* estimated 1-sigma accuracy ["]: 0.018" (0.015", 0.010")
* R mag [mag]: 6.15
* B-V [mag]: +0.52
* remarks:
Data for the minor planet:
* general information:
number, name: (308) Polyxo
approx. diameter [km]: 148
* orbital information
orbit source: calculation Manek
source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen)
number of used observations: 169 USNO, 18 TMO
number of rejected observations: 0
time covered by the observations: 1996 04 03 - 2004 03 08
rms residuals ["] (RA,DE): 0.12", 0.12"
estimated positional 2-sigma accuracy at epoch of event ["]: 0.04", 0.02"
remarks:
* orbital elements
Semimajor axis = 2.75040941382999 AU
Eccentricity = 0.038369986952612
Inclination = 4.3633118561968 deg
Long. of node = 181.9276537766974 deg
Arg. of pericenter = 110.1684570921620 deg
Mean anomaly = 231.7856959195341 deg
Epoch of elements : MJD 53325.22000000 TDT (Nov 16, 2004, 5.280000 h)
Path coordinates: click here
Calculator(s): Jan Manek
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Jan Manek
Werichova 950
152 00 Praha 5 - Barrandov |_|_|
Czech Republic / \
Internet : jan.manek AT worldonline.cz |-O-O-|
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