Update for (82) Alkmene - April 4/5, 2003

  • Update computed by Jan Manek;   issued 30 Mar 2003 03:46 +0200 (CEST)

  • Jan Manek's update

                        IOTA/IOTA-ES occultation update for
                 (82) Alkmene / TYC 1899-01174-1 on April 4/5, 2003
         visible from Portugal, S Spain, Algeria, S Tunisia, Libya and S Egypt
    
    Summary 

    In the evening of April 4/5, 2003 a faint 10.8 mag star TYC 1899-01174-1 will be occulted by a 64 km asteroid (82) Alkmene. 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 NE shift with time 0.8 minutes earlier compared to Edwin Goffin's nominal prediction.

    Updated path runs over Portugal just north of Lisbon ~20:29.9 UT, S Spain around 20:30.2 UT, Algeria ~20:30.6 UT, S Tunisia ~20:31.3 UT, Libya ~20:31.9 UT and S Egypt ~20:32.5 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 @ 20:30 UT (Europe)
     * magnitude of target star: 10.8
     * magnitude drop [mag]: 1.9
     * estimated maximum duration [s]: 3.3
     * path description: given above
     * Goffin's original chart reference: A03_0416
    
    The occultation path:
     * approximate ground width [km]: 70
     * uncertainty [path widths]: 1.0
     * uncertainty in time [s]: 3
     * 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 1899-01174-1
     * constellation: Gemini
     * J2000 position [h,m,s; o,',"]: 07h 03m 34.4440s; +25o 43' 00.137"
     * position source: recent UCAC position combined with Tycho-2 proper motion
     * estimated accuracy ["]: 0.03" (0.01", 0.02")
     * V mag [mag]: 10.81
     * B-V [mag]: +0.64
     * remarks:
        Target star is in middle Gemini, about 4.5 degrees east of 3.0 mag star epsilon Geminorum = SAO 78682.
        !!! 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: (82) Alkmene approx. diameter [km]: 64 * orbital information orbit source: calculation Manek source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen) number of used observations: 121 USNO, 9 TMO number of rejected observations: 8 USNO time covered by the observations: 1999 01 01 - 2003 03 22 rms residuals ["] (RA,DE): 0.07", 0.07" estimated positional accuracy at epoch of event ["]: 0.03", 0.04" remarks: Data for the event: * UT date and time of least geocentric approach: 20:28.3 UT * approx. V mag of minor planet at event [mag]: 12.5 * geocentric parallax of minor planet ["]: 4.641 * magnitude drop [mag]: 1.9 * estimated maximum duration [s]: 3.3 * apparent motion of minor planet ["/h]: 51.07 * angular distance to moon, phase of moon [deg,%]: 57, 8% * remarks: Elements for WinOccult: ============ cut here =========================================== 2003 Apr 04 82 Alkmene 20h 28.3m UT 99-01174-1 10.8 7 3 34.444 25 43 0.14TYC 1899-01174-1 12.5 64 3.3 1.895 3.720 -9.06 -33.930 25.720 -126.32 5.78 20.4720 .05484 .31194 10.83551 -1.95281 0.00540 -0.00059 2000 356.7481202003 4 1.00000110.50218525.640476 2.833221 0.225431192.759817242.137668368.405 0.28 RATE 2.1497280 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 ============ cut here =========================================== Calculator(s): Jan Manek

    Updated path location for (82) Alkmene 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 ' " - 13 0 0 40 23 15 20 29 33 67 -14 40 3 49 40 42 42 - 12 0 0 40 6 16 20 29 37 66 -15 39 46 48 40 25 47 - 11 0 0 39 48 52 20 29 42 66 -16 39 29 21 40 8 26 - 10 0 0 39 31 3 20 29 46 65 -16 39 11 29 39 50 40 - 9 0 0 39 12 48 20 29 51 65 -17 38 53 11 39 32 28 - 8 0 0 38 54 8 20 29 56 64 -18 38 34 28 39 13 51 - 7 0 0 38 35 2 20 30 0 64 -19 38 15 19 38 54 48 - 6 0 0 38 15 31 20 30 5 63 -20 37 55 45 38 35 20 - 5 0 0 37 55 35 20 30 10 62 -21 37 35 45 38 15 27 - 4 0 0 37 35 13 20 30 14 62 -22 37 15 20 37 55 8 - 3 0 0 37 14 26 20 30 19 61 -22 36 54 30 37 34 24 - 2 0 0 36 53 13 20 30 24 60 -23 36 33 14 37 13 15 - 1 0 0 36 31 36 20 30 28 60 -24 36 11 34 36 51 40 0 0 0 36 9 33 20 30 33 59 -25 35 49 28 36 29 41 1 0 0 35 47 6 20 30 38 58 -26 35 26 58 36 7 16 2 0 0 35 24 14 20 30 42 57 -27 35 4 3 35 44 27 3 0 0 35 0 57 20 30 47 56 -28 34 40 43 35 21 14 4 0 0 34 37 16 20 30 51 56 -29 34 16 60 34 57 36 5 0 0 34 13 11 20 30 56 55 -30 33 52 52 34 33 34 6 0 0 33 48 43 20 31 1 54 -31 33 28 20 34 9 8 7 0 0 33 23 50 20 31 5 53 -32 33 3 25 33 44 18 8 0 0 32 58 35 20 31 10 52 -32 32 38 7 33 19 5 9 0 0 32 32 56 20 31 14 51 -33 32 12 26 32 53 30 10 0 0 32 6 55 20 31 19 51 -34 31 46 22 32 27 31 11 0 0 31 40 32 20 31 23 50 -35 31 19 57 32 1 11 12 0 0 31 13 47 20 31 28 49 -36 30 53 10 31 34 28 13 0 0 30 46 41 20 31 32 48 -37 30 26 1 31 7 24 14 0 0 30 19 15 20 31 37 47 -38 29 58 32 30 39 60 15 0 0 29 51 27 20 31 41 46 -39 29 30 43 30 12 15 16 0 0 29 23 21 20 31 45 45 -40 29 2 34 29 44 10 17 0 0 28 54 55 20 31 50 44 -41 28 34 6 29 15 46 18 0 0 28 26 10 20 31 54 43 -42 28 5 20 28 47 3 19 0 0 27 57 8 20 31 58 42 -43 27 36 15 28 18 3 20 0 0 27 27 48 20 32 2 41 -44 27 6 54 27 48 45 21 0 0 26 58 11 20 32 6 40 -45 26 37 16 27 19 10 22 0 0 26 28 19 20 32 10 39 -46 26 7 22 26 49 19 23 0 0 25 58 12 20 32 14 38 -47 25 37 14 26 19 13 24 0 0 25 27 50 20 32 18 37 -48 25 6 51 25 48 52 25 0 0 24 57 14 20 32 22 36 -49 24 36 14 25 18 18 26 0 0 24 26 26 20 32 25 35 -50 24 5 25 24 47 30 27 0 0 23 55 26 20 32 29 34 -51 23 34 24 24 16 31 28 0 0 23 24 15 20 32 33 33 -52 23 3 12 23 45 20 29 0 0 22 52 53 20 32 36 32 -53 22 31 50 23 13 59 30 0 0 22 21 22 20 32 40 31 -54 22 0 19 22 42 29 31 0 0 21 49 43 20 32 43 30 -55 21 28 39 22 10 50 32 0 0 21 17 56 20 32 46 29 -56 20 56 53 21 39 3 33 0 0 20 46 3 20 32 49 28 -57 20 24 59 21 7 10 34 0 0 20 14 4 20 32 52 27 -58 19 53 1 20 35 11 35 0 0 19 42 1 20 32 55 26 -59 19 20 58 20 3 7 36 0 0 19 9 54 20 32 58 25 -60 18 48 51 19 31 0 37 0 0 18 37 44 20 33 1 24 -61 18 16 42 18 58 50 38 0 0 18 5 33 20 33 3 23 -62 17 44 31 18 26 38 39 0 0 17 33 21 20 33 6 21 -63 17 12 20 17 54 25 40 0 0 17 1 10 20 33 8 20 -64 16 40 10 17 22 13 41 0 0 16 28 59 20 33 10 19 -65 16 8 0 16 50 1 42 0 0 15 56 51 20 33 12 18 -66 15 35 54 16 17 52 43 0 0 15 24 47 20 33 14 17 -67 15 3 50 15 45 46 44 0 0 14 52 46 20 33 16 16 -68 14 31 51 15 13 44 45 0 0 14 20 51 20 33 18 15 -69 13 59 58 14 41 47 46 0 0 13 49 2 20 33 20 14 -69 13 28 10 14 9 57 47 0 0 13 17 20 20 33 21 13 -70 12 56 30 13 38 13 48 0 0 12 45 47 20 33 23 12 -71 12 24 58 13 6 38 49 0 0 12 14 22 20 33 24 10 -72 11 53 36 12 35 11 50 0 0 11 43 7 20 33 25 9 -72 11 22 23 12 3 55 51 0 0 11 12 3 20 33 26 8 -73 10 51 21 11 32 49 ............................. 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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