Update for (20) Massalia - September 4/5, 2002
Update computed by Jan Manek; issued 31 Aug 2002 17:15:00 +0200 (CEST)
Jan Manek's update
IOTA/IOTA-ES occultation update for
(20) Massalia / SAO 76758 = TYC 1279-00884-1 on September 4/5, 2002
visible from S America, Carribean, Morocco and Algeria
Summary
In the night of September 4/5, 2002 a bright 8.5 mag star SAO 76758 = TYC 1279-00884-1
will be occulted by a 151 km asteroid (20) Massalia. This update is based on
USNO/Flagstaff and CAMC for the asteroid and Tycho-2 star position.
The updated path shows ~0.2 path widths south shift with time ~0.2 minutes later compared to
Edwin Goffin's nominal prediction.
Updated path runs over South America and Caribbean area around ~05:00 UT, later after crossing
Atlantic ocean path runs between Canary Island and Madeira ~05:03 UT, Morocco ~05:03.6 UT
and finally north Algeria under morning twilight ~05:04.5 UT.
Please check the path chart for details.
Clear sky and good luck !!!
The event at one glimpse:
* date and approx. UT time of event: September 5, 2002 @ 05:04 UT (Europe)
* magnitude of target star: 8.5
* magnitude drop [mag]: 2.3
* estimated maximum duration [s]: 7.7
* path description: given above
* Goffin's original chart reference: A02_0907
The occultation path:
* approximate ground width [km]: 160
* uncertainty [path widths]: 0.9
* uncertainty in time [s]: 7
* map: below
* remarks: Path uncertainties are given according to nominal star
position errors and expected asteroid positional accuracy.
Data for the target star:
* name: SAO 76758 = PPM 93774 = TYC 1851-00054-1
* constellation: Taurus
* J2000 position [h,m,s; o,',"]: 04h 47m 47.9315s; +22o 08' 21.825"
* position source: Tycho-2
* estimated accuracy ["]: 0.02" (0.015", 0.016")
* V mag [mag]: 8.46
* B-V [mag]: +1.79
* remarks:
Target star is in middle Taurus, about 6.3 degrees northeast of 1.0 mag star alpha Tauri = Aldebaran.
!!! IMPORTANT !!!
GSC flags this entry as non-star and GSC position refers to photocenter of a pair os stars, where the
secondary star is ~14th mag and ~11" north of target.
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.
Close finding chart (prepared in GUIDE7):
* occulted star is in center - labeled with cross
* field is 4.0x4.0 degrees
* limiting magnitude is 13.0
* labeled stars have indicated SAO numbers
* remarks:
Data for the minor planet:
* general information:
number, name: (20) Massalia
approx. diameter [km]: 151
* orbital information
orbit source: calculation Manek
source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen), CAMC
number of used observations: 89 USNO, 63 TMO, 59 CAMC
number of rejected observations: 5 USNO, 6 CAMC
time covered by the observations: 1987 09 21 - 2001 10 21
rms residuals ["] (RA,DE): 0.14", 0.12"
estimated positional accuracy at epoch of event ["]: 0.07", 0.08"
remarks: No recent opposition astrometry.
Data for the event:
* UT date and time of least geocentric approach: 05:05.0 UT
* approx. V mag of minor planet at event [mag]: 10.7
* geocentric parallax of minor planet ["]: 4.494
* magnitude drop [mag]: 2.3
* estimated maximum duration [s]: 7.7
* apparent motion of minor planet ["/h]: 49.88
* angular distance to moon, phase of moon [deg,%]: 62, 6%
* remarks:
Elements for WinOccult:
============ cut here ===========================================
2002 Sep 05
20 Massalia
5h 5.0m UT
79-00884-1 8.5 4 47 47.932 22 8 21.83TYC 1279-00884-1
10.7 151 7.7 1.957 3.569 5.30
11.566 22.138 103.47 6.88
5.0829 -.02463 .23472 11.03333 1.18080 -0.00534 -0.00067
2000 315.7588562002 9 3.00000255.790168206.5992640.706015 0.142839902.408678792.064623366.505 0.25
RATE 2.6365480 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000
============ cut here ===========================================
Calculator(s): Jan Manek
Path coordinates:
Latitude Latitude
Center Altitude Path Limits
E. Longitude Latitude U.T. star sun Limit 1 Limit 2
........................... shortened .............................
o ' " o ' " h m s o o o ' " o ' "
- 76 0 0 8 39 54 4 59 44 4 -74 7 54 8 9 25 51
- 75 0 0 9 5 8 4 59 44 5 -74 8 19 19 9 51 7
- 74 0 0 9 30 28 4 59 45 6 -74 8 44 37 10 16 29
- 73 0 0 9 55 54 4 59 46 7 -73 9 10 1 10 41 57
- 72 0 0 10 21 26 4 59 47 9 -73 9 35 31 11 7 31
- 71 0 0 10 47 2 4 59 48 10 -72 10 1 5 11 33 9
- 70 0 0 11 12 42 4 59 49 11 -71 10 26 44 11 58 51
- 69 0 0 11 38 26 4 59 50 12 -71 10 52 26 12 24 36
- 68 0 0 12 4 12 4 59 51 13 -70 11 18 11 12 50 23
- 67 0 0 12 30 1 4 59 53 14 -69 11 43 58 13 16 13
- 66 0 0 12 55 50 4 59 54 15 -68 12 9 47 13 42 4
- 65 0 0 13 21 41 4 59 56 16 -67 12 35 37 14 7 55
- 64 0 0 13 47 31 4 59 58 17 -67 13 1 27 14 33 46
- 63 0 0 14 13 21 4 59 60 18 -66 13 27 16 14 59 36
- 62 0 0 14 39 10 5 0 2 19 -65 13 53 4 15 25 25
- 61 0 0 15 4 56 5 0 4 20 -64 14 18 51 15 51 12
- 60 0 0 15 30 40 5 0 6 21 -63 14 44 34 16 16 55
- 59 0 0 15 56 20 5 0 8 22 -62 15 10 15 16 42 36
- 58 0 0 16 21 57 5 0 11 23 -61 15 35 52 17 8 12
- 57 0 0 16 47 29 5 0 13 24 -60 16 1 25 17 33 43
- 56 0 0 17 12 56 5 0 16 26 -59 16 26 52 17 59 9
- 55 0 0 17 38 16 5 0 19 27 -58 16 52 14 18 24 29
- 54 0 0 18 3 31 5 0 21 28 -57 17 17 29 18 49 42
- 53 0 0 18 28 38 5 0 24 29 -56 17 42 38 19 14 48
- 52 0 0 18 53 37 5 0 27 30 -55 18 7 38 19 39 45
- 51 0 0 19 18 28 5 0 30 31 -55 18 32 31 20 4 35
........................... shortened .............................
- 21 0 0 29 58 3 5 2 32 59 -26 29 13 51 30 42 24
- 20 0 0 30 14 49 5 2 36 60 -25 29 30 42 30 59 6
- 19 0 0 30 31 15 5 2 41 61 -24 29 47 12 31 15 27
- 18 0 0 30 47 21 5 2 46 62 -23 30 3 22 31 31 28
- 17 0 0 31 3 6 5 2 50 63 -22 30 19 12 31 47 9
- 16 0 0 31 18 31 5 2 55 63 -21 30 34 41 32 2 29
- 15 0 0 31 33 35 5 2 60 64 -20 30 49 49 32 17 29
- 14 0 0 31 48 18 5 3 4 65 -19 31 4 36 32 32 7
- 13 0 0 32 2 40 5 3 9 66 -19 31 19 3 32 46 25
- 12 0 0 32 16 41 5 3 14 66 -18 31 33 8 33 0 22
- 11 0 0 32 30 21 5 3 19 67 -17 31 46 52 33 13 58
- 10 0 0 32 43 40 5 3 24 68 -16 32 0 16 33 27 13
- 9 0 0 32 56 38 5 3 28 68 -15 32 13 18 33 40 6
- 8 0 0 33 9 15 5 3 33 69 -14 32 25 58 33 52 39
- 7 0 0 33 21 30 5 3 38 70 -13 32 38 18 34 4 50
- 6 0 0 33 33 24 5 3 43 70 -12 32 50 16 34 16 40
- 5 0 0 33 44 57 5 3 48 71 -12 33 1 52 34 28 9
- 4 0 0 33 56 8 5 3 52 72 -11 33 13 7 34 39 17
- 3 0 0 34 6 58 5 3 57 72 -10 33 24 1 34 50 3
- 2 0 0 34 17 27 5 4 2 73 -9 33 34 33 35 0 28
- 1 0 0 34 27 34 5 4 7 73 -8 33 44 44 35 10 32
0 0 0 34 37 20 5 4 12 74 -7 33 54 34 35 20 15
1 0 0 34 46 45 5 4 16 74 -6 34 4 2 35 29 36
2 0 0 34 55 48 5 4 21 75 -6 34 13 8 35 38 36
3 0 0 35 4 30 5 4 26 75 -5 34 21 53 35 47 15
4 0 0 35 12 51 5 4 31 75 -4 34 30 16 35 55 32
........................... shortened .............................
----------------------------------------------------------------------------
Jan Manek
Stefanik Observatory Private :
Petrin 205 Werichova 950
118 46 Praha 1 152 00 Praha 5 - Barrandov |_|_|
Czech Republic Czech Republic / \
Internet : jan.manek@worldonline.cz |-O-O-|
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