Update for (248) Lameia - November 9/10, 1999

  • Update computed by Jan Manek;   issued 08 Nov 1999 13:29:17 +0100 (CET)

  • Jan Manek's update

                         IOTA/IOTA-ES occultation update for
            (248) Lameia / TYC 1260 00449 1 event on November 9/10, 1999
                 visible from southern Spain and Portugal in Europe,
         South Carolina, Georgia, NW Florida, S Alabama, very SE Louisiana, 
                   very SW Texas and north Mexico in North America
    
    
    Summary 

    In the night November 9/10, 1999 a 10.2 mag star TYC 1260 00449 1 will be occulted by a 52 km asteroid (248) Lameia. This update is based on USNO/Flagstaff astrometry for the asteroid and ACT star position.

    The updated path runs ~1 path width south with time ~0.3 minutes later compared to Edwin Goffin's nominal prediction.

    The path now runs over southern Spain and southern Portugal at ~5:26 UT. After crossing Atlantic Ocean path runs over South Carolina at ~5:33.5 UT, Georgia ~5:34 UT, NW Florida and S Alabama ~5:34.5 UT, very SE Louisiana at ~5:35, very SW Texas ~5:36 UT and north Mexico around 5:37 UT.

    The uncertainity for this event is rather large, however occultation by (248) Lameia was successfully observed by 5 people in South Africa on June 27, 1998. Relative to this update it was observed about 0.6 path width north of this path, so maybe observers on the northern limit have slightly larger chance for this event.

    Star is quite red, so drift scan observations with 8" telescope at focal length ~700 mm should be easy despite 10.2 magnitude, which is in V band. Don't forget to calibrate the scans in some way, so not only duration but also absolute times could be extracted from your images.

    
    The event at one glimpse:
     * date and approx. UT time of event: November 10, 1999 @ 05:26 UT (Euro)
                                            05:34 UT (USA), 05:37 UT (Mexico)
     * magnitude of target star: 10.2
     * magnitude drop [mag]: 3.6
     * estimated maximum duration [s]: 4.4
     * path description: given above
    
    The occultation path:
     * approximate ground width [km]: 55
     * uncertainty [path widths]: 3.5
     * uncertainty in time [s]: 20
     * map: 2 attached (1 for Europe, 1 for North America)
     * 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: TYC 1260 00449 1
     * constellation: Taurus
     * J2000 position [h,m,s; o,',"]: 03h 49m 41.669s; +21o 26' 06.41"
     * position source: ACT
     * estimated accuracy ["]: 0.08" (0.08", 0.03")
     * V mag [mag]: 10.24
     * B-V [mag]: +1.18
     * remarks: TYCHO gives quality flag 5 (=medium) together with 
         'no duplicity' flag.
    
         Target star is in western Taurus, about 3 degrees south of famous
         M45 open cluster. About 11' SW of target is 8.2 mag star SAO 76227
         and also be careful - there is 10.5 mag star TYC 1260 00315 only 
         1' just north of target.
    
    Data for the minor planet:
     * general information:
         number, name: (248) Lameia
         approx. diameter [km]: 52
     * orbital information
         orbit source: calculation Manek
         source of used astrometry: USNO/Flagstaff (Ron Stone)
         number of used observations: 34 USNO
         number of rejected observations: 5 USNO
         time covered by the observations: 1998 05 25 - 1999 11 01
         rms residuals ["] (RA,DE): 0.10", 0.10"
         estimated positional accuracy at epoch of event ["]: 0.10"
         remarks: 
    
    Data for the event:
     * UT date and time of least geocentric approach: 05:33:37 UT
     * approx. V mag of minor planet at event [mag]: 13.8
     * geocentric parallax of minor planet ["]: 5.359
     * magnitude drop [mag]: 3.6
     * estimated maximum duration [s]: 4.4
     * apparent motion of minor planet ["/h]: 35.67
     * angular distance to moon, phase of moon [deg,%]: 169, 4%
     * remarks: 
    
    Calculator(s): Jan Manek
    
    

    Updated path location for (248) Lameia on November 9/10, 1999 - Euro

    Updated path location for (248) Lameia on November 9/10, 1999 - North America Path coordinates: Altitude E. Longitude Latitude U.T. star sun ........ shortened .......................... + 9 00 00 + 34 20 13 5 25 16 18 -6 + 7 00 00 + 34 51 11 5 25 21 20 -8 + 5 00 00 + 35 20 31 5 25 27 22 -9 + 3 00 00 + 35 48 13 5 25 33 23 -11 + 1 00 00 + 36 14 17 5 25 40 25 -13 - 1 00 00 + 36 38 44 5 25 47 27 -14 - 3 00 00 + 37 01 35 5 25 54 28 -16 - 5 00 00 + 37 22 51 5 26 02 30 -18 - 7 00 00 + 37 42 32 5 26 09 31 -19 - 9 00 00 + 38 00 39 5 26 18 33 -21 - 11 00 00 + 38 17 13 5 26 26 35 -22 - 13 00 00 + 38 32 14 5 26 35 36 -24 - 15 00 00 + 38 45 44 5 26 44 38 -25 ........ shortened .......................... - 71 00 00 + 35 01 03 5 32 31 76 -67 - 73 00 00 + 34 31 16 5 32 47 77 -68 - 75 00 00 + 33 59 58 5 33 03 77 -70 - 77 00 00 + 33 27 07 5 33 19 78 -71 - 79 00 00 + 32 52 43 5 33 35 78 -72 - 81 00 00 + 32 16 47 5 33 51 78 -74 - 83 00 00 + 31 39 20 5 34 08 77 -75 - 85 00 00 + 31 00 21 5 34 25 77 -76 - 87 00 00 + 30 19 52 5 34 41 76 -77 - 89 00 00 + 29 37 53 5 34 58 75 -77 - 91 00 00 + 28 54 26 5 35 15 74 -78 - 93 00 00 + 28 09 32 5 35 33 73 -78 - 95 00 00 + 27 23 12 5 35 50 71 -78 - 97 00 00 + 26 35 28 5 36 07 70 -77 - 99 00 00 + 25 46 23 5 36 24 68 -77 -101 00 00 + 24 55 59 5 36 41 66 -76 -103 00 00 + 24 04 19 5 36 59 65 -74 -105 00 00 + 23 11 25 5 37 16 63 -73 -107 00 00 + 22 17 22 5 37 33 61 -72 -109 00 00 + 21 22 12 5 37 50 59 -70 -111 00 00 + 20 26 01 5 38 06 57 -68 -113 00 00 + 19 28 51 5 38 23 55 -67 ........ 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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