Update for (54) Alexandra - April 4/5, 2003

  • Update computed by Jan Manek;   issued 30 Mar 2003 01:27 +0100 (CET)

  • Jan Manek's update

                        IOTA/IOTA-ES occultation update for
                 (54) Alexandra / TYC 1875-00830-1 on April 4/5, 2003
            visible from N Norway, N Sweden, SW Finland, Estonia and Russia
    
    Summary 

    In the evening of April 4/5, 2003 a faint 12.2 mag star TYC 1875-00830-1 will be occulted by a 171 km asteroid (54) Alexandra. This update is based on USNO/Flagstaff and TMO astrometry for the asteroid and recent UCAC star position.

    The updated path shows ~1 path width SW shift with time 0.1 minutes earlier compared to Edwin Goffin's nominal prediction.

    Updated path runs over N Norway ~19:45.2 UT, N Sweden ~19:45.3 UT, SW Finland around 19:45.7 UT with Helsinki in path and Turku on SW limit, Estonia ~19:45.9 UT and finally west Russia from NW to SE around 19:46.5 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: April 4, 2003 @ 19:46 UT (Europe)
     * magnitude of target star: 12.2
     * magnitude drop [mag]: 1.7
     * estimated maximum duration [s]: 7.8
     * path description: given above
     * Goffin's original chart reference: A03_0412
    
    The occultation path:
     * approximate ground width [km]: 260
     * uncertainty [path widths]: 0.7
     * uncertainty in time [s]: 5
     * map: below
     * remarks: Path uncertainties are given according to nominal star
        position errors and expected asteroid positional accuracy.
    
    Data for the target star:
     * name: TYC 1875-00830-1
     * constellation: Auriga
     * J2000 position [h,m,s; o,',"]: 05h 59m 43.0959s; +28o 32' 15.810"
     * position source: recent UCAC position combined with Tycho-2 proper motion
     * estimated accuracy ["]: 0.05" (0.03", 0.04")
     * V mag [mag]: 12.21
     * B-V [mag]: +1.31
     * remarks:
        Target star is in S Auriga, about 7.3 degrees east of 1.7 mag star beta Tauri = SAO 77168,
        on border with Taurus and close to border with Gemini.
        !!! IMPORTANT !!!
        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 GUIDE8):
     * occulted star is in center - labeled with cross
     * field is 3.0x3.0 degrees
     * limiting magnitude is 12.5
     * labeled stars have indicated SAO numbers
     * remarks: Second chart is 30' blowup to show correctly the target star in the field.
    
    

    Close finding chart

    Close finding chart

    Data for the minor planet: * general information: number, name: (54) Alexandra approx. diameter [km]: 171 * orbital information orbit source: calculation Manek source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen) number of used observations: 118 USNO, 10 TMO number of rejected observations: 17 USNO, 2 TMO time covered by the observations: 1998 11 14 - 2003 03 08 rms residuals ["] (RA,DE): 0.06", 0.05" estimated positional accuracy at epoch of event ["]: 0.03", 0.03" remarks: Data for the event: * UT date and time of least geocentric approach: 19:44.3 UT * approx. V mag of minor planet at event [mag]: 13.7 * geocentric parallax of minor planet ["]: 2.637 * magnitude drop [mag]: 1.7 * estimated maximum duration [s]: 7.8 * apparent motion of minor planet ["/h]: 32.52 * angular distance to moon, phase of moon [deg,%]: 43, 8% * remarks: Elements for WinOccult: ============ cut here =========================================== 2003 Apr 04 54 Alexandra 19h 44.3m UT 75-00830-1 12.2 5 59 43.096 28 32 15.81TYC 1875-00830-1 13.7 171 7.8 3.335 2.405 -7.29 -38.871 28.540 -115.33 5.77 19.7392 .16559 .72371 12.02083 -2.76662 0.00567 0.00014 2000 162.1515922003 4 1.00000345.068736313.52836011.828814 0.198237402.711178442.173721467.665 0.15 RATE 2.2078360 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 ============ cut here =========================================== Calculator(s): Jan Manek

    Updated path location for (54) Alexandra on April 4/5, 2003

    Path coordinates: Centre Altitude Path Limits E. Longitude Latitude U.T. star sun Limit 1 Limit 2 Latitude Latitude ............................. shortened .................................. o ' " o ' " h m s o o o ' " o ' " 5 0 0 70 19 46 19 44 42 41 -4 68 40 55 72 3 23 6 0 0 69 57 47 19 44 44 41 -5 68 18 14 71 42 14 7 0 0 69 35 7 19 44 47 41 -5 67 54 51 71 20 22 8 0 0 69 11 44 19 44 49 41 -6 67 30 47 70 57 46 9 0 0 68 47 36 19 44 52 41 -6 67 6 0 70 34 25 10 0 0 68 22 45 19 44 55 41 -7 66 40 30 70 10 18 11 0 0 67 57 9 19 44 58 41 -7 66 14 16 69 45 25 12 0 0 67 30 46 19 45 1 41 -8 65 47 19 69 19 44 13 0 0 67 3 38 19 45 4 41 -9 65 19 36 68 53 15 14 0 0 66 35 43 19 45 7 40 -9 64 51 9 68 25 57 15 0 0 66 7 1 19 45 10 40 -10 64 21 58 67 57 50 16 0 0 65 37 32 19 45 13 40 -10 63 52 1 67 28 54 17 0 0 65 7 15 19 45 16 40 -11 63 21 19 66 59 7 18 0 0 64 36 11 19 45 20 39 -12 62 49 52 66 28 30 19 0 0 64 4 20 19 45 23 39 -12 62 17 40 65 57 4 20 0 0 63 31 42 19 45 26 39 -13 61 44 44 65 24 47 21 0 0 62 58 18 19 45 30 39 -14 61 11 5 64 51 40 22 0 0 62 24 7 19 45 33 38 -15 60 36 42 64 17 44 23 0 0 61 49 11 19 45 37 38 -15 60 1 36 63 42 59 24 0 0 61 13 31 19 45 40 37 -16 59 25 49 63 7 27 25 0 0 60 37 7 19 45 44 37 -17 58 49 21 62 31 7 26 0 0 60 0 0 19 45 48 37 -18 58 12 14 61 54 1 27 0 0 59 22 12 19 45 51 36 -19 57 34 28 61 16 11 28 0 0 58 43 45 19 45 55 36 -19 56 56 6 60 37 37 29 0 0 58 4 39 19 45 59 35 -20 56 17 9 59 58 22 30 0 0 57 24 57 19 46 3 35 -21 55 37 38 59 18 27 31 0 0 56 44 40 19 46 6 34 -22 54 57 35 58 37 54 32 0 0 56 3 51 19 46 10 34 -23 54 17 2 57 56 45 33 0 0 55 22 31 19 46 14 33 -24 53 36 1 57 15 2 34 0 0 54 40 42 19 46 18 32 -25 52 54 35 56 32 48 35 0 0 53 58 28 19 46 21 32 -26 52 12 44 55 50 4 36 0 0 53 15 49 19 46 25 31 -26 51 30 32 55 6 54 37 0 0 52 32 49 19 46 29 30 -27 50 48 1 54 23 20 38 0 0 51 49 29 19 46 33 30 -28 50 5 13 53 39 25 39 0 0 51 5 54 19 46 36 29 -29 49 22 10 52 55 11 40 0 0 50 22 4 19 46 40 28 -30 48 38 55 52 10 40 41 0 0 49 38 3 19 46 43 27 -31 47 55 31 51 25 57 42 0 0 48 53 53 19 46 47 26 -32 47 11 59 50 41 3 43 0 0 48 9 37 19 46 50 26 -33 46 28 22 49 56 1 44 0 0 47 25 16 19 46 53 25 -34 45 44 42 49 10 54 45 0 0 46 40 55 19 46 56 24 -35 45 1 3 48 25 44 46 0 0 45 56 35 19 46 59 23 -36 44 17 26 47 40 35 47 0 0 45 12 19 19 47 2 22 -37 43 33 53 46 55 29 48 0 0 44 28 9 19 47 5 21 -38 42 50 27 46 10 28 49 0 0 43 44 7 19 47 8 20 -39 42 7 10 45 25 36 50 0 0 43 0 17 19 47 11 19 -40 41 24 4 44 40 53 51 0 0 42 16 39 19 47 13 18 -41 40 41 12 43 56 24 52 0 0 41 33 16 19 47 16 17 -42 39 58 35 43 12 9 53 0 0 40 50 11 19 47 18 16 -42 39 16 15 42 28 12 54 0 0 40 7 25 19 47 20 15 -43 38 34 15 41 44 34 55 0 0 39 24 60 19 47 22 14 -44 37 52 35 41 1 18 56 0 0 38 42 58 19 47 24 13 -45 37 11 19 40 18 24 57 0 0 38 1 20 19 47 26 12 -46 36 30 26 39 35 56 58 0 0 37 20 9 19 47 28 11 -47 35 50 0 38 53 55 59 0 0 36 39 26 19 47 29 10 -47 35 10 2 38 12 22 60 0 0 35 59 13 19 47 31 9 -48 34 30 32 37 31 19 61 0 0 35 19 30 19 47 32 8 -49 33 51 33 36 50 48 62 0 0 34 40 20 19 47 33 7 -50 33 13 5 36 10 50 63 0 0 34 1 42 19 47 34 6 -50 32 35 10 35 31 25 ............................. 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---

    Be sure to use the RELOAD button of your browser,
    so you will surely use the latest version of predictions page!