Update for (196) Philomela - January 23/24, 1999

Update computed by Jan Manek; issued 22 Jan 1999 15:38:51 +0100 (CET)

Jan Manek's update

                      IOTA/IOTA-ES occultation update for
            (196) Philomela / TYC 1924 01286 event on 1999, January 23
              visible from Turkey, Greece, Italy, Spain and Portugal

Summary

On the night January 23/24, 1999 will be occulted 10.9 mag star by a 146km asteroid (196) Philomela. This update is based on TMO astrometry for asteroid and ACT star position. The updated path is shifted slightly south being also about 0.2 minute earlier that Goffin's nominal prediction (see here for finder chart and nominal prediction). For Europe this event takes place near zenith and compensates slightly the faintness of star. Be careful as the magnitude drop is only 0.9 magnitudes and the target star is SW in a roughly equal bright wide double (this may be good for the observation of this minor drop).


The event at one glimpse:
 * date and approx. UT time of event: January, 6, 1999 @ 23:22 UT (Euro)
 * magnitude of target star: 10.9
 * magnitude drop [mag]: 0.9
 * estimated maximum duration [s]: 10.9
 * path description: Path runs over India, Pakistan, Afghanistan, Iran and Iraq 
     with probably no observers there. At ~21:19 UT path runs over Turkey, 
     at ~21:20:30 UT over Greece, ~21:21:30 UT over middle-south Italy (Rome has 
     a chance), Corse and Sardegna ~21:22 UT. At ~21:23 UT path runs over 
     middle-north Spain (Barcelona and Madrid have a chance) and north Portugal.

The occultation path:
 * approximate width [km]: 150
 * uncertainty [path widths]: 1.5
 * uncertainty in time [s]: 25
 * map: see below
 * remarks: Path uncertainities are given according to nominal star position 
    errors and expected asteroid positional accuracy. For any larger shift is 
    responsible true star position.
    !!!!!!!
    Circles along the path are OCCULT exactly calculated centerline points. 
    !!!!!!!

Data for the target star:
 * name: TYC 1924 01286 1
 * constellation: Gemini
 * J2000 position [h,m,s; o,',"]: 07h 43m 54.813s; +28o 35' 32.57"
 * position source: ACT
 * estimated accuracy ["]: 0.06"  (0.05", 0.04")
 * V mag [mag]: 10.88
 * B-V [mag]: +0.19 
 * remarks: Target star is about 40' northwest of 1.2 mag star beta Gem (Pollux).
    The magnitude given is Johnson V mag. Be careful with locating the correct 
    target star - it is southwest one of the equal brightness double with 27" 
    separation. For sure I have added also detailed finder chart according to 
    GUIDE7 with correct star marked there - see below. The square in the middle 
    has 30' side.

Data for the minor planet:
 * general information:
     mumber, name: (196) Philomela
     approx. diameter [km]: 146
 * orbital information
     orbit source: Bowell
     source of used astrometry: TMO (Bill Owen)
     number of used observations: 17
     number of rejected observations: 1 (1998 12 29.256192)
     time covered by the observations: 1998 10 11 - 1999 01 07
     rms residuals ["] (RA,DE): 0.07", 0.06"
     estimated positional accuracy at epoch of event ["]: 0.09"
     remarks: 

Data for the event:
 * UT date and time of least geocentric approach: 21:19:06 UT
 * approx. V mag of minor planet at event [mag]: 11.2
 * geocentric parallax of minor planet ["]: 3.959
 * magnitude drop [mag]: 0.9
 * estimated maximum duration [s]: 10.9
 * apparent motion of minor planet ["/h]: 30.03
 * angular distance to moon, phase of moon [deg,%]: 93, 39%
 * remarks: 

Calculator(s): Manek











Path coordinates:
                                       Altitude
  E. Longitude    Latitude     U.T.    star  sun
   + 69 00 00   + 26 32 07   21 15 15   59   -66
   + 67 00 00   + 27 27 13   21 15 29   61   -67
   + 65 00 00   + 28 20 32   21 15 43   63   -69
   + 63 00 00   + 29 12 03   21 15 58   65   -70
   + 61 00 00   + 30 01 44   21 16 12   66   -71
   + 59 00 00   + 30 49 35   21 16 26   68   -72
   + 57 00 00   + 31 35 34   21 16 41   70   -73
   + 55 00 00   + 32 19 42   21 16 55   71   -74
   + 53 00 00   + 33 01 58   21 17 09   73   -74
   + 51 00 00   + 33 42 22   21 17 24   74   -74
   + 49 00 00   + 34 20 55   21 17 38   76   -74
   + 47 00 00   + 34 57 37   21 17 52   77   -74
   + 45 00 00   + 35 32 28   21 18 05   78   -74
   + 43 00 00   + 36 05 30   21 18 19   79   -73
   + 41 00 00   + 36 36 43   21 18 33   80   -73
   + 39 00 00   + 37 06 09   21 18 46   80   -72
   + 37 00 00   + 37 33 47   21 19 00   80   -71
   + 35 00 00   + 37 59 39   21 19 13   80   -70
   + 33 00 00   + 38 23 47   21 19 26   80   -69
   + 31 00 00   + 38 46 10   21 19 39   79   -68
   + 29 00 00   + 39 06 50   21 19 52   79   -67
   + 27 00 00   + 39 25 48   21 20 05   78   -66
   + 25 00 00   + 39 43 05   21 20 17   77   -64
   + 23 00 00   + 39 58 41   21 20 29   76   -63
   + 21 00 00   + 40 12 38   21 20 42   75   -62
   + 19 00 00   + 40 24 55   21 20 54   73   -61
   + 17 00 00   + 40 35 34   21 21 06   72   -59
   + 15 00 00   + 40 44 35   21 21 18   71   -58
   + 13 00 00   + 40 51 59   21 21 30   70   -57
   + 11 00 00   + 40 57 46   21 21 41   68   -56
   +  9 00 00   + 41 01 56   21 21 53   67   -54
   +  7 00 00   + 41 04 30   21 22 04   66   -53
   +  5 00 00   + 41 05 27   21 22 15   64   -51
   +  3 00 00   + 41 04 48   21 22 26   63   -50
   +  1 00 00   + 41 02 32   21 22 37   61   -49
   -  1 00 00   + 40 58 39   21 22 48   60   -47
   -  3 00 00   + 40 53 09   21 22 59   59   -46
   -  5 00 00   + 40 46 02   21 23 09   57   -45
   -  7 00 00   + 40 37 17   21 23 20   56   -43
   -  9 00 00   + 40 26 52   21 23 30   54   -42
   - 11 00 00   + 40 14 49   21 23 40   53   -40
   - 13 00 00   + 40 01 05   21 23 50   51   -39
   - 15 00 00   + 39 45 40   21 24 00   50   -37
   - 17 00 00   + 39 28 33   21 24 10   48   -36
   - 19 00 00   + 39 09 43   21 24 20   47   -34
   - 21 00 00   + 38 49 08   21 24 29   45   -33
   - 23 00 00   + 38 26 48   21 24 38   44   -31
   - 25 00 00   + 38 02 42   21 24 48   42   -30
   - 27 00 00   + 37 36 48   21 24 56   41   -28
   - 29 00 00   + 37 09 05   21 25 05   39   -27

----------------------------------------------------------------------------
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---

Be sure to use the RELOAD button of your browser,

 so you will surely use the latest version of predictions page!