Update for (309) Fraternitas - March 23/24, 2003

  • Update computed by Jan Manek;   issued 16 Mar 2003 19:33 +0100 (CET)

  • Jan Manek's update

                        IOTA/IOTA-ES occultation update for
              (309) Fraternitas / TYC 1887-00025-1 on March 23/24, 2003
                               visible from Russia
    
    Summary 

    In the night of March 23/24, 2003 a faint 12.3 mag star TYC 1887-00025-1 will be occulted by a 55 km asteroid (309) Fraternitas. This update is based on USNO/Flagstaff and TMO astrometry for the asteroid and recent UCAC star position.

    The updated path shows ~6 path width north shift with time 1.4 minutes later compared to Edwin Goffin's nominal prediction.

    Updated path runs over Russia around 23:48.0 UT at low altitudes. I suppose that this together with faint star and only 4 second maximum duration makes this event practically unobservable. Please check the path chart for details.

    Clear sky and good luck !!!

    
    The event at one glimpse:
     * date and approx. UT time of event: March 23, 2003 @ 23:48 UT (Europe)
     * magnitude of target star: 12.3
     * magnitude drop [mag]: 3.6
     * estimated maximum duration [s]: 4.0
     * path description: given above
     * Goffin's original chart reference: A03_0331
    
    The occultation path:
     * approximate ground width [km]: 230
     * uncertainty [path widths]: 1.5
     * uncertainty in time [s]: 7
     * 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 1887-00025-1
     * constellation: Gemini
     * J2000 position [h,m,s; o,',"]: 06h 25m 37.8846s; +26o 50' 20.993"
     * position source: recent UCAC position combined with Tycho-2 proper motion
     * estimated accuracy ["]: 0.02" (0.02", 0.01")
     * V mag [mag]: 12.33
     * B-V [mag]: +0.35
     * remarks:
        Target star is in NW Gemini almost on border with Auriga, about 4.4 degrees north of 2.9 mag star
        mu Geminorum = SAO 78297.
        !!! 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: (309) Fraternitas approx. diameter [km]: 55 * orbital information orbit source: calculation Manek source of used astrometry: USNO/Flagstaff (Ron Stone) number of used observations: 92 USNO, 20 TMO number of rejected observations: 20 USNO time covered by the observations: 1997 10 21 - 2003 03 06 rms residuals ["] (RA,DE): 0.07", 0.07" estimated positional accuracy at epoch of event ["]: 0.04", 0.04" remarks: Data for the event: * UT date and time of least geocentric approach: 23:46.5 UT * approx. V mag of minor planet at event [mag]: 15.9 * geocentric parallax of minor planet ["]: 3.207 * magnitude drop [mag]: 3.6 * estimated maximum duration [s]: 4.0 * apparent motion of minor planet ["/h]: 24.74 * angular distance to moon, phase of moon [deg,%]: 163, 62% * remarks: Elements for WinOccult: ============ cut here =========================================== 2003 Mar 23 309 Fraternitas 23h 46.5m UT 87-00025-1 12.3 6 25 37.885 26 50 20.99TYC 1887-00025-1 15.9 55 4.0 2.742 1.815 -4.72 -81.259 26.841 -174.97 1.17 23.7744 .18362 .94989 7.57293 -1.47110 0.00581 -0.00028 2000 164.6203032003 322.00000310.638012356.6569393.721209 0.114781362.666158532.3601332410.45 0.15 RATE 2.2639930 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 ============ cut here =========================================== Calculator(s): Jan Manek

    Updated path location for (309) Fraternitas on March 23/24, 2003

    Path coordinates: Center Altitude Path Limits E. Longitude Latitude U.T. star sun Limit 1 Limit 2 ........................... shortened ............................. o ' " o ' " h m s o o o ' " o ' " Latitude Latitude 61 0 0 74 9 45 23 46 20 14 -8 75 16 51 72 56 1 60 0 0 73 59 57 23 46 23 14 -8 75 8 29 72 44 19 59 0 0 73 49 9 23 46 26 14 -8 74 59 17 72 31 19 58 0 0 73 37 15 23 46 28 14 -9 74 49 14 72 16 53 57 0 0 73 24 8 23 46 31 14 -9 74 38 12 72 0 50 56 0 0 73 9 40 23 46 34 14 -9 74 26 8 71 42 54 55 0 0 72 53 39 23 46 38 14 -10 74 12 54 71 22 47 54 0 0 72 35 53 23 46 41 14 -10 73 58 22 71 0 2 53 0 0 72 16 3 23 46 45 14 -11 73 42 21 70 34 2 52 0 0 71 53 46 23 46 48 14 -11 73 24 39 70 3 54 51 0 0 71 28 30 23 46 53 14 -12 73 4 59 69 28 13 50 0 0 70 59 29 23 46 57 13 -12 72 42 59 68 44 26 49 0 0 70 25 31 23 47 2 13 -13 72 18 9 67 47 11 48 0 0 69 44 38 23 47 8 13 -14 71 49 48 66 18 54 Longitude Longitude 46 13 38 68 0 0 23 47 22 12 -15 43 30 41 49 11 49 45 36 29 67 0 0 23 47 29 12 -16 43 2 34 48 23 35 45 13 6 66 0 0 23 47 36 11 -17 42 46 28 47 51 27 45 1 33 65 0 0 23 47 42 11 -18 42 40 51 47 32 55 45 0 23 64 0 0 23 47 48 10 -18 42 44 30 47 26 10 45 8 32 63 0 0 23 47 54 9 -19 42 56 32 47 29 55 45 25 12 62 0 0 23 47 59 8 -20 43 16 17 47 43 10 45 49 50 61 0 0 23 48 4 7 -20 43 43 16 48 5 17 46 22 3 60 0 0 23 48 8 7 -21 44 17 9 48 35 49 47 1 39 59 0 0 23 48 12 6 -21 44 57 43 49 14 33 47 48 34 58 0 0 23 48 15 5 -22 45 44 56 50 1 27 ........................... 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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