Update for (261) Prymno - June 5, 1999
(Final?) update computed by Jan Manek; issued 04 June 1999 14:54:20 +0200 (CEST)
Preliminary update computed by Jan Manek; issued 28 May 1999 12:04:20 +0200 (CEST)
Jan Manek's (final?) update
IOTA/IOTA-ES occultation update for
(261) Prymno / HIP 94510 event on 1999, June 5
visible from Ukraina, Romania, Yugoslavia, middle Italy,
Corse and northern Spain
Summary
On the night June 5, 1999 will be occulted 7.0 mag star by a 52 km asteroid (261) Prymno.
This update is based on USNO/Flagstaff and TMO astrometry for asteroid and HIPPARCOS star position.
This preliminary update gives 0.4" south shift and no time correction compared to
Goffin's nominal prediction - very similar to the preliminary result,
however this one is ~0.5 path width north of the preliminary. Consult the chart in the text below.
Path runs over Ukraina ~23:14.5 UT, Moldavia ~23:15.5 UT, Romania ~23:16 UT, NW Bulgaria
and Yugoslavia ~23:17 UT. Middle Italy (with Rome on the southern edge) is in path ~23:19 UT,
Corse, N Sardegna ~23:19.5 UT. Finally all north Spain (with Barcelona ~23:21 UT on south limit)
plus the Pyrenee area is in path. Although the star will not be high (only 10-21 degrees) it is
quite bright so the observation of the 7.7 second long dropout of almost 6 magnitudes should be
possible even in small telescopes.
The event at one glimpse:
* date and approx. UT time of event: June 05, 1999 @ 23:19 UT
* magnitude of target star: 7.0
* magnitude drop [mag]: 5.9
* estimated maximum duration [s]: 7.7
* path description: Path runs over Ukraina ~23:14.5 UT, Moldavia ~23:15.5 UT,
Romania ~23:16 UT, NW Bulgaria and Yugoslavia ~23:17 UT. Middle Italy
(with Rome on the southern edge) is in path ~23:19 UT, Corse, N Sardegna
~23:19.5 UT. Finally all north Spain (with Barcelona ~23:21 UT on south
limit) plus the Pyrenee area is in path. Fortunately there are many good
observers here.
Check the chart for details.
The occultation path:
* approximate width [km]: 150
* uncertainty [path widths]: 1.5
* uncertainty in time [s]: 15
* map: see below
* remarks: Path uncertainities are given according to nominal star position
errors and expected asteroid positional accuracy.
!!!!!!!
Circles along the path are OCCULT exactly calculated centerline points.
!!!!!!!
Data for the target star:
* name: HIP 94510 = SAO 187856 = PPM 269500 = TYC 6308 02295 1
* constellation: Sagittarius
* J2000 position [h,m,s; o,',"]: 19h 14m 08.768s; -22o 03' 38.29"
* position source: HIPPARCOS
* estimated accuracy ["]: 0.01" (0.01", 0.00")
* Johnson V mag [mag]: 6.98
* B-V [mag]: +0.09
* remarks:
Target star is 1.5 degrees SE of 2.9 mag star pi Sgr.
6' east of target is 8.8 mag star SAO 187867, 8' NW of target is 8.7 mag
star SAO 187850 and only 2' SW of target is 10.6 mag star GSC 6308.2009.
The star should be easy to locate.
Data for the minor planet:
* general information:
number, name: (261) Prymno
approx. diameter [km]: 52
* orbital information
orbit source: Bowell
source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen)
number of used observations: 11 USNO, 5 TMO
number of rejected observations: 0
time covered by the observations: 1998 02 13 - 1999 05 31
rms residuals ["] (RA,DE): 0.07", 0.07"
estimated positional accuracy at epoch of event ["]: 0.07"
remarks: Only differential corrections were applied using
the total of 8 positions from 1999 year.
Data for the event:
* UT date and time of least geocentric approach: 23:17:27 UT
* approx. V mag of minor planet at event [mag]: 7.0
* geocentric parallax of minor planet ["]: 5.970
* magnitude drop [mag]: 5.9
* estimated maximum duration [s]: 7.7
* apparent motion of minor planet ["/h]: 22.78
* angular distance to moon, phase of moon [deg,%]: 42, 63%
* remarks:
Calculator(s): Jan Manek
Path coordinates:
Altitude
E. Longitude Latitude U.T. star sun
......... shortened .........................
+ 47 00 00 + 57 24 36 23 12 17 11 -5
+ 45 00 00 + 55 45 34 23 12 35 12 -7
+ 43 00 00 + 54 15 45 23 12 55 14 -9
+ 41 00 00 + 52 53 39 23 13 16 15 -10
+ 39 00 00 + 51 38 16 23 13 38 16 -12
+ 37 00 00 + 50 28 56 23 14 00 17 -14
+ 35 00 00 + 49 25 08 23 14 24 18 -15
+ 33 00 00 + 48 26 28 23 14 47 19 -16
+ 31 00 00 + 47 32 40 23 15 11 19 -18
+ 29 00 00 + 46 43 30 23 15 36 20 -19
+ 27 00 00 + 45 58 46 23 16 00 20 -20
+ 25 00 00 + 45 18 19 23 16 24 20 -21
+ 23 00 00 + 44 42 03 23 16 49 20 -22
+ 21 00 00 + 44 09 51 23 17 13 20 -23
+ 19 00 00 + 43 41 40 23 17 36 20 -23
+ 17 00 00 + 43 17 24 23 18 00 20 -24
+ 15 00 00 + 42 57 03 23 18 23 19 -24
+ 13 00 00 + 42 40 33 23 18 45 19 -25
+ 11 00 00 + 42 27 53 23 19 07 18 -25
+ 9 00 00 + 42 19 03 23 19 28 18 -25
+ 7 00 00 + 42 14 03 23 19 48 17 -25
+ 5 00 00 + 42 12 53 23 20 07 16 -25
+ 3 00 00 + 42 15 35 23 20 26 15 -25
+ 1 00 00 + 42 22 11 23 20 43 14 -25
- 1 00 00 + 42 32 43 23 20 59 13 -24
- 3 00 00 + 42 47 14 23 21 14 12 -24
- 5 00 00 + 43 05 48 23 21 28 11 -23
- 7 00 00 + 43 28 30 23 21 40 10 -22
- 9 00 00 + 43 55 25 23 21 51 8 -22
- 11 00 00 + 44 26 41 23 22 00 7 -21
- 13 00 00 + 45 02 24 23 22 07 5 -20
......... shortened .........................
----------------------------------------------------------------------------
Jan Manek
Stefanik Observatory Private :
Petrin 205 Werichova 950
118 46 Praha 1 152 00 Praha 5 - Barrandov |_|_|
Czech Republic Czech Republic / \
Internet : jmanek@mbox.vol.cz |-O-O-|
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Jan Manek's preliminary update
IOTA/IOTA-ES occultation update for
(261) Prymno / HIP 94510 event on 1999, June 5
visible from Ukraina, Romania, Yugoslavia, middle Italy,
Corse and northern Spain
Summary
On the night June 5, 1999 will be occulted 7.0 mag star by a 52 km asteroid (261) Prymno.
This update is based on USNO/Flagstaff astrometry for asteroid and HIPPARCOS star position.
This preliminary update gives 0.4" south shift and time ~4.5 minutes earlier compared to
Goffin's nominal prediction.
Path runs over Ukraina ~23:14.5 UT, Moldavia ~23:15.5 UT, Romania ~23:16 UT, NW Bulgaria
and Yugoslavia ~23:17 UT. Middle Italy with Rome is in path ~23:19 UT, Corse, N Sardegna ~23:19.5 UT.
Finally all north Spain (with Barcelona ~23:21 UT plus the south Pyrenee area) is in path.
Although the star will not be high (only 10-21 degrees) it is quite bright so the observation
of the 7.7 second long dropout of almost 6 magnitudes should be possible even in small telescopes.
The event at one glimpse:
* date and approx. UT time of event: June 05, 1999 @ 23:19 UT
* magnitude of target star: 7.0
* magnitude drop [mag]: 5.9
* estimated maximum duration [s]: 7.7
* path description: Path runs over Ukraina ~23:14.5 UT, Moldavia ~23:15.5 UT,
Romania ~23:16 UT, NW Bulgaria and Yugoslavia ~23:17 UT. Middle Italy
with Rome is in path ~23:19 UT, Corse, N Sardegna ~23:19.5 UT. Finally
all north Spain (with Barcelona ~23:21 UT plus the south Pyrenee area)
is in path. Fortunately there are many good observers here.
Check the chart for details.
The occultation path:
* approximate width [km]: 150
* uncertainty [path widths]: 2
* uncertainty in time [s]: 20
* map: see below
* remarks: Path uncertainities are given according to nominal star position
errors and expected asteroid positional accuracy.
!!!!!!!
Circles along the path are OCCULT exactly calculated centerline points.
!!!!!!!
Data for the target star:
* name: HIP 94510 = SAO 187856 = PPM 269500 = TYC 6308 02295 1
* constellation: Sagittarius
* J2000 position [h,m,s; o,',"]: 19h 14m 08.768s; -22o 03' 38.29"
* position source: HIPPARCOS
* estimated accuracy ["]: 0.01" (0.01", 0.00")
* Johnson V mag [mag]: 6.98
* B-V [mag]: +0.09
* remarks:
Target star is 1.5 degrees SE of 2.9 mag star pi Sgr.
6' east of target is 8.8 mag star SAO 187867, 8' NW of target is 8.7 mag
star SAO 187850 and only 2' SW of target is 10.6 mag star GSC 6308.2009.
The star should be easy to locate.
Data for the minor planet:
* general information:
number, name: (261) Prymno
approx. diameter [km]: 52
* orbital information
orbit source: Bowell
source of used astrometry: USNO/Flagstaff (Ron Stone)
number of used observations: 11 USNO
number of rejected observations: 0
time covered by the observations: 1998 02 13 - 1999 05 18
rms residuals ["] (RA,DE): 0.08", 0.08"
estimated positional accuracy at epoch of event ["]: 0.10"
remarks: Currently only differential corrections were applied using
the 3 latest positions.
Data for the event:
* UT date and time of least geocentric approach: 23:16:20 UT
* approx. V mag of minor planet at event [mag]: 7.0
* geocentric parallax of minor planet ["]: 5.970
* magnitude drop [mag]: 5.9
* estimated maximum duration [s]: 7.7
* apparent motion of minor planet ["/h]: 22.78
* angular distance to moon, phase of moon [deg,%]: 42, 63%
* remarks:
Calculator(s): Jan Manek
Path coordinates:
Altitude
E. Longitude Latitude U.T. star sun
......... shortened .........................
+ 47 00 00 + 56 31 01 23 12 17 12 -6
+ 45 00 00 + 54 56 53 23 12 35 13 -7
+ 43 00 00 + 53 30 46 23 12 56 15 -9
+ 41 00 00 + 52 11 34 23 13 17 16 -11
+ 39 00 00 + 50 58 32 23 13 39 17 -13
+ 37 00 00 + 49 51 07 23 14 02 18 -14
+ 35 00 00 + 48 48 56 23 14 25 19 -16
+ 33 00 00 + 47 51 38 23 14 49 19 -17
+ 31 00 00 + 46 58 59 23 15 13 20 -18
+ 29 00 00 + 46 10 48 23 15 38 20 -19
+ 27 00 00 + 45 26 55 23 16 02 21 -21
+ 25 00 00 + 44 47 11 23 16 27 21 -21
+ 23 00 00 + 44 11 32 23 16 51 21 -22
+ 21 00 00 + 43 39 52 23 17 15 21 -23
+ 19 00 00 + 43 12 07 23 17 39 21 -24
+ 17 00 00 + 42 48 14 23 18 02 20 -24
+ 15 00 00 + 42 28 10 23 18 25 20 -25
+ 13 00 00 + 42 11 54 23 18 48 19 -25
+ 11 00 00 + 41 59 24 23 19 10 19 -26
+ 9 00 00 + 41 50 41 23 19 31 18 -26
+ 7 00 00 + 41 45 43 23 19 51 17 -26
+ 5 00 00 + 41 44 33 23 20 11 17 -26
+ 3 00 00 + 41 47 11 23 20 29 16 -26
+ 1 00 00 + 41 53 39 23 20 46 15 -25
- 1 00 00 + 42 04 00 23 21 03 14 -25
- 3 00 00 + 42 18 15 23 21 18 12 -24
- 5 00 00 + 42 36 30 23 21 32 11 -24
- 7 00 00 + 42 58 48 23 21 44 10 -23
- 9 00 00 + 43 25 14 23 21 55 8 -22
- 11 00 00 + 43 55 55 23 22 05 7 -21
- 13 00 00 + 44 30 58 23 22 12 6 -20
......... shortened .........................
----------------------------------------------------------------------------
Jan Manek
Stefanik Observatory Private :
Petrin 205 Werichova 950
118 46 Praha 1 152 00 Praha 5 - Barrandov |_|_|
Czech Republic Czech Republic / \
Internet : jmanek@mbox.vol.cz |-O-O-|
--------------------------------------------------------------------U---U---
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