Update for (177) Irma - January 16/17, 2003

  • Update computed by Jan Manek;   issued 05 Jan 2003 20:09 +0100 (CET)

  • Jan Manek's update

                        IOTA/IOTA-ES occultation update for
                  (177) Irma / TYC 1375-00220-1 on January 16/17, 2003
            visible from Bulgaria, SW Romania, NE Serbia, SW Hungary, Austria,
        SW Czechia, Germany, Netherlands, Scotland, Greenland, N Canada and Alaska
    
    Summary 

    In the night of January 16/17, 2003 a faint 12.1 mag star TYC 1375-00220-1 will be occulted by a 75 km asteroid (177) Irma. This update is based on USNO/Flagstaff astrometry for the asteroid and recent UCAC star position.

    The updated path shows ~5 path width north shift with time 0.8 minutes earlier compared to Edwin Goffin's nominal prediction.

    Updated path runs over Bulgaria ~4:29.6 UT, SW Romania ~4:29.8 UT, NE Serbia ~4:29.9 UT, SW Hungary ~4:30.1 UT, Austria just west of Vienna ~4:30.3 UT, SW Czechia ~4:30.6 UT, Germany from SE to NW around 4:30.8 UT, Netherlands ~4:31.0 UT, Scotland ~4:32.0 UT, Greenland ~4:35 UT, N Canada 4:37-4:39 UT and Alaska ~4:40 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: January 17, 2003 @ 04:30 UT (Europe)
     * magnitude of target star: 12.1
     * magnitude drop [mag]: 1.2
     * estimated maximum duration [s]: 6.3
     * path description: given above
     * Goffin's original chart reference: A03_0122
    
    The occultation path:
     * approximate ground width [km]: 115
     * 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 1375-00220-1
     * constellation: Gemini
     * J2000 position [h,m,s; o,',"]: 07h 58m 43.9170s; +22o 23' 54.011"
     * position source: recent UCAC position combined with Tycho-2 proper motion
     * estimated accuracy ["]: 0.02" (0.01", 0.01")
     * V mag [mag]: 12.10
     * B-V [mag]: +0.77
     * remarks:
        Target star is in east Gemini, about 3.8 degrees SE of 3.6 mag star kappa Geminorum = SAO 97908.
        Close to border with Cancer.
        !!! 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 GUIDE7):
     * occulted star is in center - labeled with cross
     * field is 3.0x3.0 degrees
     * limiting magnitude is 13.5
     * labeled stars have indicated SAO numbers
     * remarks:
    
    

    Close finding chart Data for the minor planet: * general information: number, name: (177) Irma approx. diameter [km]: 75 * orbital information orbit source: calculation Manek source of used astrometry: USNO/Flagstaff (Ron Stone) number of used observations: 92 USNO number of rejected observations: 17 USNO time covered by the observations: 1998 12 27 - 2002 12 20 rms residuals ["] (RA,DE): 0.08", 0.10" estimated positional accuracy at epoch of event ["]: 0.06", 0.08" remarks: Data for the event: * UT date and time of least geocentric approach: 04:35.1 UT * approx. V mag of minor planet at event [mag]: 12.8 * geocentric parallax of minor planet ["]: 5.343 * magnitude drop [mag]: 1.2 * estimated maximum duration [s]: 6.3 * apparent motion of minor planet ["/h]: 36.02 * angular distance to moon, phase of moon [deg,%]: 16, 98% * remarks: Elements for WinOccult: ============ cut here =========================================== 2003 Jan 17 177 Irma 4h 35.1m UT 75-00220-1 12.1 7 58 43.917 22 23 54.01TYC 1375-00220-1 12.8 75 6.3 1.646 -2.559 6.15 -65.298 22.398 113.69 -20.83 4.5857 .12596 .72641 -6.64585 1.15226 -0.00009 -0.00016 2000 62.89240882003 111.0000038.405382 347.7160031.395510 0.234332622.772627842.122910699.495 0.15 RATE 2.1348468 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 ============ cut here =========================================== Calculator(s): Jan Manek

    Updated path location for (177) Irma on January 16/17, 2002

    Updated path location for (177) Irma on January 16/17, 2002 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 34 0 0 38 34 26 4 29 17 8 -6 39 9 26 37 59 52 33 0 0 39 2 53 4 29 18 9 -7 39 38 2 38 28 12 32 0 0 39 31 33 4 29 20 10 -8 40 6 49 38 56 44 31 0 0 40 0 23 4 29 23 11 -9 40 35 48 39 25 27 30 0 0 40 29 24 4 29 25 11 -10 41 4 56 39 54 20 29 0 0 40 58 33 4 29 28 12 -11 41 34 13 40 23 22 28 0 0 41 27 51 4 29 30 13 -11 42 3 38 40 52 32 27 0 0 41 57 15 4 29 33 14 -12 42 33 10 41 21 49 26 0 0 42 26 46 4 29 36 15 -13 43 2 48 41 51 13 25 0 0 42 56 21 4 29 40 16 -14 43 32 30 42 20 41 24 0 0 43 26 0 4 29 43 17 -15 44 2 17 42 50 13 23 0 0 43 55 42 4 29 47 17 -16 44 32 6 43 19 49 22 0 0 44 25 26 4 29 50 18 -16 45 1 56 43 49 27 21 0 0 44 55 11 4 29 54 19 -17 45 31 48 44 19 5 20 0 0 45 24 56 4 29 58 20 -18 46 1 39 44 48 44 19 0 0 45 54 39 4 30 2 21 -19 46 31 28 45 18 21 18 0 0 46 24 20 4 30 6 21 -20 47 1 16 45 47 57 17 0 0 46 53 58 4 30 11 22 -20 47 30 59 46 17 29 16 0 0 47 23 32 4 30 15 23 -21 48 0 38 46 46 58 15 0 0 47 53 0 4 30 19 24 -22 48 30 12 47 16 21 14 0 0 48 22 23 4 30 24 24 -22 48 59 39 47 45 39 13 0 0 48 51 38 4 30 29 25 -23 49 28 59 48 14 49 12 0 0 49 20 45 4 30 34 26 -24 49 58 10 48 43 52 11 0 0 49 49 43 4 30 38 26 -25 50 27 12 49 12 47 10 0 0 50 18 31 4 30 43 27 -25 50 56 4 49 41 31 9 0 0 50 47 8 4 30 48 28 -26 51 24 44 50 10 5 8 0 0 51 15 34 4 30 53 28 -26 51 53 13 50 38 28 7 0 0 51 43 47 4 30 58 29 -27 52 21 29 51 6 39 6 0 0 52 11 47 4 31 4 29 -28 52 49 31 51 34 36 5 0 0 52 39 32 4 31 9 30 -28 53 17 19 52 2 20 4 0 0 53 7 3 4 31 14 31 -29 53 44 51 52 29 49 3 0 0 53 34 18 4 31 19 31 -29 54 12 7 52 57 4 2 0 0 54 1 17 4 31 25 32 -30 54 39 7 53 24 2 1 0 0 54 27 60 4 31 30 32 -30 55 5 50 53 50 44 0 0 0 54 54 24 4 31 35 33 -31 55 32 15 54 17 8 - 1 0 0 55 20 31 4 31 41 33 -31 55 58 21 54 43 15 - 2 0 0 55 46 18 4 31 46 34 -32 56 24 8 55 9 3 - 3 0 0 56 11 47 4 31 51 34 -32 56 49 35 55 34 33 - 4 0 0 56 36 56 4 31 57 35 -33 57 14 43 55 59 43 - 5 0 0 57 1 44 4 32 2 35 -33 57 39 29 56 24 34 - 6 0 0 57 26 13 4 32 8 35 -34 58 3 55 56 49 4 - 7 0 0 57 50 20 4 32 13 36 -34 58 27 60 57 13 13 - 8 0 0 58 14 5 4 32 18 36 -34 58 51 43 57 37 2 - 9 0 0 58 37 30 4 32 24 37 -35 59 15 4 58 0 29 - 10 0 0 59 0 32 4 32 29 37 -35 59 38 2 58 23 35 - 11 0 0 59 23 12 4 32 34 37 -35 60 0 39 58 46 19 - 12 0 0 59 45 30 4 32 39 38 -36 60 22 52 59 8 41 - 13 0 0 60 7 25 4 32 45 38 -36 60 44 43 59 30 40 ........................... shortened ............................. -127 0 0 69 51 3 4 39 0 31 -30 70 23 21 69 19 7 -128 0 0 69 42 56 4 39 3 31 -29 70 15 20 69 10 54 -129 0 0 69 34 33 4 39 5 30 -29 70 7 4 69 2 24 -130 0 0 69 25 53 4 39 8 30 -29 69 58 31 68 53 37 -131 0 0 69 16 57 4 39 11 30 -29 69 49 42 68 44 34 -132 0 0 69 7 43 4 39 13 29 -28 69 40 36 68 35 13 -133 0 0 68 58 13 4 39 16 29 -28 69 31 13 68 25 35 -134 0 0 68 48 24 4 39 18 29 -28 69 21 32 68 15 40 -135 0 0 68 38 18 4 39 21 28 -27 69 11 34 68 5 27 -136 0 0 68 27 55 4 39 24 28 -27 69 1 18 67 54 55 -137 0 0 68 17 12 4 39 26 28 -27 68 50 43 67 44 5 -138 0 0 68 6 11 4 39 29 27 -26 68 39 50 67 32 57 -139 0 0 67 54 52 4 39 32 27 -26 68 28 38 67 21 29 -140 0 0 67 43 13 4 39 34 27 -26 68 17 8 67 9 43 -141 0 0 67 31 14 4 39 37 26 -25 68 5 17 66 57 37 -142 0 0 67 18 56 4 39 40 26 -25 67 53 8 66 45 11 -143 0 0 67 6 18 4 39 42 26 -25 67 40 38 66 32 25 -144 0 0 66 53 20 4 39 45 25 -24 67 27 48 66 19 19 -145 0 0 66 40 1 4 39 48 25 -24 67 14 37 66 5 52 -146 0 0 66 26 22 4 39 50 25 -24 67 1 6 65 52 4 -147 0 0 66 12 21 4 39 53 24 -23 66 47 14 65 37 56 -148 0 0 65 57 59 4 39 56 24 -23 66 32 60 65 23 26 -149 0 0 65 43 16 4 39 58 23 -22 66 18 24 65 8 34 -150 0 0 65 28 10 4 40 1 23 -22 66 3 27 64 53 21 -151 0 0 65 12 43 4 40 3 22 -21 65 48 8 64 37 46 -152 0 0 64 56 53 4 40 6 22 -21 65 32 26 64 21 48 -153 0 0 64 40 40 4 40 9 22 -21 65 16 21 64 5 28 -154 0 0 64 24 5 4 40 11 21 -20 64 59 54 63 48 45 -155 0 0 64 7 7 4 40 14 21 -20 64 43 4 63 31 40 -156 0 0 63 49 45 4 40 16 20 -19 64 25 50 63 14 11 -157 0 0 63 32 1 4 40 19 20 -19 64 8 13 62 56 19 -158 0 0 63 13 53 4 40 21 19 -18 63 50 12 62 38 4 -159 0 0 62 55 21 4 40 24 19 -18 63 31 47 62 19 25 -160 0 0 62 36 25 4 40 26 18 -17 63 12 59 62 0 23 -161 0 0 62 17 6 4 40 29 18 -17 62 53 46 61 40 57 -162 0 0 61 57 22 4 40 31 17 -16 62 34 9 61 21 7 -163 0 0 61 37 15 4 40 33 17 -16 62 14 8 61 0 53 -164 0 0 61 16 43 4 40 36 16 -15 61 53 43 60 40 16 -165 0 0 60 55 48 4 40 38 15 -15 61 32 54 60 19 15 -166 0 0 60 34 29 4 40 40 15 -14 61 11 40 59 57 50 -167 0 0 60 12 45 4 40 42 14 -13 60 50 2 59 36 2 -168 0 0 59 50 38 4 40 44 14 -13 60 27 60 59 13 50 -169 0 0 59 28 7 4 40 46 13 -12 60 5 34 58 51 14 -170 0 0 59 5 13 4 40 48 12 -12 59 42 44 58 28 15 -171 0 0 58 41 55 4 40 50 12 -11 59 19 30 58 4 54 ........................... 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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