Update for (242) Kriemhild - January 17/18, 2002

  • Update computed by Jan Manek;   issued 13 Jan 2002 20:25:00 +0100 (CET)

  • Jan Manek's update

                           IOTA/IOTA-ES occultation update for
                (242) Kriemhild / TYC 0182-00175-1 on January 17/18, 2002
        visible from middle East, north Africa, S Spain and S Portugal in Europe,
                                 plus NE Canada and USA
    
    
    Summary 

    In the night of January 17/18, 2002 a 9.9 mag star TYC 0182-00175-1 will be occulted by a 42 km asteroid (242) Kriemhild. This update is based on USNO/Flagstaff and TMO astrometry for the asteroid and UCAC star position.

    The updated path shows ~2 path widths north shift with time ~0.3 minutes earlier compared to Edwin Goffin's nominal prediction.

    Updated path runs over middle East and north Africa. Over south Spain path runs around 0:18.1 UT and south Portugal ~0:18.9 UT with Lisbon on north limit. Later path runs over NE Canada ~0:25 UT with Montreal and Ottawa ~0:25.3 UT and USA - Great lakes area ~0:25.9 UT; north Wisconsin and middle Minnesota. Please check the path chart for details.

    
    The event at one glimpse:
     * date and approx. UT time of event: January 18, 2002 @ 00:18 UT (Euro)
                                                             00:25 UT (North Am.)
     * magnitude of target star: 9.9
     * magnitude drop [mag]: 2.9
     * estimated maximum duration [s]: 4.0
     * path description: given above
     * Goffin's original chart reference: A02_0123
    
    The occultation path:
     * approximate ground width [km]: 50
     * uncertainty [path widths]: 2.7
     * uncertainty in time [s]: 10
     * map: below
     * remarks: Path uncertainities are given according to nominal star
        position errors and expected asteroid positional accuracy.
    
    Data for the target star:
     * name: TYC 0182-00175-1
     * constellation: Canis Minor
     * J2000 position [h,m,s; o,',"]: 07h 36m 53.7741s; +02o 54' 04.565"
     * position source: weighted mean of Tycho-2 and UCAC + Tycho-2 proper motion
     * estimated accuracy ["]: 0.02" (0.015", 0.020")
     * V mag [mag]: 9.93
     * B-V [mag]: +0.94
     * remarks:
         Recent UCAC position was provided by Marion and Norbert Zacharias.
         Target star is in south Canis Minor, 2.4 degrees south of Procyon =
         alpha Canis Minoris = SAO 115756. Be careful to observe the correct star -
         only 1.3' south of target is a 10.2 mag companion TYC 0182-00063-1.
    
    Close finding chart (prepared in GUIDE7):
     * occulted star is in center - labeled with cross
     * field is 2.0x2.0 degrees
     * limiting magnitude is 13.0
     * labeled stars have indicated SAO numbers
    
    

    Close finding chart Data for the minor planet: * general information: number, name: (242) Kriemhild approx. diameter [km]: 42 * orbital information orbit source: calculation Manek source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen) number of used observations: 82 USNO, 2 TMO number of rejected observations: 3 USNO time covered by the observations: 1998 02 12 - 2002 01 08 rms residuals ["] (RA,DE): 0.12", 0.10" estimated positional accuracy at epoch of event ["]: 0.08", 0.08" remarks: Data for the event: * UT date and time of least geocentric approach: 00:17.6 UT * approx. V mag of minor planet at event [mag]: 12.7 * geocentric parallax of minor planet ["]: 5.630 * magnitude drop [mag]: 2.9 * estimated maximum duration [s]: 4.0 * apparent motion of minor planet ["/h]: 32.97 * angular distance to moon, phase of moon [deg,%]: 124, 18% * remarks: Calculator(s): Jan Manek

    Updated path location for (242) Kriemhild on January 17/18, 2002

    Updated path location for (242) Kriemhild on January 17/18, 2002 Path coordinates: Latitude Latitude Centre Altitude Path Limits E. Longitude Latitude U.T. star sun Limit 1 Limit 2 ........................... shortened ............................. o ' " o ' " h m s o o o ' " o ' " 2 0 0 36 14 17 0 17 18 56 -74 36 28 25 36 0 12 0 0 0 36 36 16 0 17 35 56 -74 36 50 23 36 22 10 - 2 0 0 36 58 2 0 17 52 56 -74 37 12 9 36 43 57 - 4 0 0 37 19 34 0 18 9 55 -73 37 33 42 37 5 29 - 6 0 0 37 40 51 0 18 26 55 -73 37 54 59 37 26 47 - 8 0 0 38 1 52 0 18 43 55 -72 38 15 59 37 47 48 - 10 0 0 38 22 35 0 18 59 55 -71 38 36 42 38 8 31 - 12 0 0 38 42 59 0 19 16 54 -70 38 57 5 38 28 55 - 14 0 0 39 3 2 0 19 32 54 -69 39 17 8 38 48 59 ........................... shortened ............................. - 56 0 0 44 17 22 0 24 8 32 -41 44 31 14 44 3 33 - 58 0 0 44 26 13 0 24 17 30 -39 44 40 5 44 12 25 - 60 0 0 44 34 27 0 24 26 29 -38 44 48 18 44 20 39 - 62 0 0 44 42 4 0 24 35 28 -37 44 55 53 44 28 16 - 64 0 0 44 49 2 0 24 43 26 -35 45 2 51 44 35 15 - 66 0 0 44 55 22 0 24 51 25 -34 45 9 11 44 41 35 - 68 0 0 45 1 4 0 24 59 24 -32 45 14 52 44 47 17 - 70 0 0 45 6 6 0 25 6 22 -31 45 19 54 44 52 21 - 72 0 0 45 10 30 0 25 12 21 -30 45 24 17 44 56 45 - 74 0 0 45 14 15 0 25 19 20 -28 45 28 2 45 0 30 - 76 0 0 45 17 20 0 25 25 18 -27 45 31 7 45 3 36 - 78 0 0 45 19 46 0 25 30 17 -25 45 33 32 45 6 1 - 80 0 0 45 21 31 0 25 35 16 -24 45 35 18 45 7 48 - 82 0 0 45 22 37 0 25 40 14 -23 45 36 23 45 8 54 - 84 0 0 45 23 3 0 25 44 13 -21 45 36 49 45 9 20 - 86 0 0 45 22 49 0 25 48 11 -20 45 36 35 45 9 6 - 88 0 0 45 21 55 0 25 51 10 -18 45 35 41 45 8 12 - 90 0 0 45 20 20 0 25 54 9 -17 45 34 6 45 6 37 - 92 0 0 45 18 5 0 25 57 7 -16 45 31 51 45 4 22 - 94 0 0 45 15 9 0 25 59 6 -14 45 28 55 45 1 26 - 96 0 0 45 11 33 0 26 1 5 -13 45 25 19 44 57 50 ........................... 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-| --------------------------------------------------------------------U---U---

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