IOTA/IOTA-ES occultation update for (923) Herluga / TYC 0592-00384-1 event on 2012 Sep 30, 20:02 UT Visible from Russia, SW Asia, Africa Summary ------- On 2012 Sep 30 UT, the 35 km diameter asteroid (923) Herluga will occult a 11.5 mag star in the constellation Pisces for observers along a path across Russia, SW Asia, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.6 mag to 14.0 mag (the magnitude of the asteroid) for at most 3.5 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 54 * date and approx. time of event: 2012 Sep 30, 19:53 - 2012 Sep 30, 20:11 UT * geocentric midpoint of event [JD]: 2456201.33537083 * magnitude of target star: 11.5 * magnitude drop [mag]: 2.6 * estimated maximum duration [s]: 3.5 * Moon: 100 % sunlit, 17° distance * Sun: 169° distance * rough path description: Russia, SW Asia, Africa The occultation path -------------------- * approximate projected width [km]: 40 * 1 sigma uncertainty interval [path widths]: +/- 1.16 * 1 sigma uncertainty interval [seconds]: +/- 3.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .052 +/- .040) * 1 sigma uncertainty ellipse (major, minor, PA): ( .053", .040", 82° ) * approx speed of asteroid's shadow [km/s]: 10.0559 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0592-00384-1 by 923 Herluga on 2012 Sep 30 Centre Star Star Sun Path Limit1 Path Limit2 Error Limit1 Error Limit2 E. Longitude Latitude U.T. Alt Az Alt o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " o ' " o ' " o ' " o ' " Longitude Latitude Longitude Latitude Longitude Latitude Longitude Latitude 91 8 39 85 28 42 19 53 54 9 224 -7 88 32 12 85 2 18 94 34 55 85 55 31 84 28 4 84 3 22 108 22 15 86 56 54 63 44 4 81 6 6 19 54 8 15 196 -12 64 0 0 80 45 51 63 27 45 81 26 48 64 35 45 80 0 25 62 48 19 82 16 45 55 55 45 77 30 29 19 54 22 18 188 -16 56 21 43 77 14 9 55 28 50 77 47 1 57 18 39 76 37 5 54 22 12 78 26 18 51 46 20 74 27 15 19 54 36 21 184 -19 52 12 3 74 13 16 51 19 53 74 41 23 53 9 12 73 41 16 50 15 32 75 14 42 48 58 40 71 45 12 19 54 50 24 181 -21 49 22 52 71 32 45 48 33 57 71 57 44 50 17 5 71 4 13 47 34 25 72 27 9 46 51 46 69 18 9 19 55 4 27 179 -23 47 14 23 69 6 50 46 28 45 69 29 32 48 5 22 68 40 48 45 33 43 69 56 11 45 8 41 67 2 23 19 55 17 29 177 -26 45 29 54 66 51 55 44 47 9 67 12 53 46 17 55 66 27 50 43 55 55 67 37 26 43 40 58 64 55 28 19 55 31 31 175 -27 44 0 58 64 45 42 43 20 43 65 5 17 44 46 24 64 23 9 42 32 40 65 28 11 42 23 54 62 55 44 19 55 45 33 174 -29 42 42 51 62 46 31 42 4 43 63 4 58 43 26 2 62 25 14 41 19 22 63 26 32 41 14 34 61 1 56 19 55 59 35 172 -31 41 32 37 60 53 11 40 56 19 61 10 43 42 13 50 60 32 59 40 13 16 61 31 9 40 11 4 59 13 10 19 56 13 37 171 -32 40 28 21 59 4 49 39 53 38 59 21 32 41 7 50 58 45 31 39 12 33 59 41 2 39 12 7 57 28 43 19 56 27 38 170 -34 39 28 43 57 20 42 38 55 23 57 36 44 40 6 41 57 2 11 38 16 1 57 55 25 38 16 47 55 48 0 19 56 41 40 168 -35 38 32 46 55 40 17 38 0 41 55 55 43 39 9 23 55 22 27 37 22 49 56 13 41 37 24 22 54 10 34 19 56 55 41 167 -36 37 39 49 54 3 7 37 8 49 54 18 1 38 15 14 53 45 54 36 32 17 54 35 22 36 34 22 52 36 2 19 57 9 43 166 -38 36 49 20 52 28 50 36 19 18 52 43 15 37 23 40 52 12 9 35 43 57 53 0 2 35 46 21 51 4 6 19 57 22 44 164 -39 36 0 53 50 57 6 35 31 44 51 11 6 36 34 16 50 40 54 34 57 27 51 27 23 35 0 1 49 34 29 19 57 36 45 163 -40 35 14 10 49 27 40 34 45 48 49 41 18 35 46 39 49 11 54 34 12 29 49 57 8 34 15 6 48 6 57 19 57 50 47 161 -41 34 28 53 48 0 19 34 1 15 48 13 36 35 0 35 47 44 57 33 28 47 48 29 2 33 31 23 46 41 20 19 58 4 48 160 -42 33 44 51 46 34 51 33 17 52 46 47 49 34 15 49 46 19 50 32 46 11 47 2 53 32 48 42 45 17 26 19 58 18 49 158 -43 33 1 52 45 11 6 32 35 28 45 23 46 33 32 9 44 56 25 32 4 31 45 38 30 32 6 53 43 55 6 19 58 32 50 157 -43 32 19 46 43 48 54 31 53 55 44 1 18 32 49 27 43 34 31 31 23 37 44 15 43 31 25 48 42 34 13 19 58 46 51 155 -44 31 38 27 42 28 8 31 13 6 42 40 18 32 7 34 42 14 2 30 43 24 42 54 26 30 45 21 41 14 39 19 59 0 52 153 -45 30 57 46 41 8 40 30 32 53 41 20 37 31 26 22 40 54 50 30 3 45 41 34 29 30 5 27 39 56 18 19 59 14 53 152 -46 30 17 39 39 50 26 29 53 12 40 2 10 30 45 46 39 36 49 29 24 34 40 15 47 29 25 59 38 39 4 19 59 28 54 150 -46 29 38 0 38 33 17 29 13 56 38 44 50 30 5 40 38 19 55 28 45 47 38 58 14 28 46 54 37 22 52 19 59 41 55 148 -47 28 58 43 37 17 11 28 35 2 37 28 33 29 25 59 37 4 1 28 7 18 37 41 44 28 8 7 36 7 37 19 59 55 56 146 -47 28 19 46 36 2 1 27 56 25 36 13 13 28 46 38 35 49 2 27 29 6 36 26 12 27 29 34 34 53 15 20 0 9 56 144 -48 27 41 4 34 47 44 27 18 1 34 58 47 28 7 35 34 34 56 26 51 5 35 11 35 26 51 12 33 39 43 20 0 23 57 142 -48 27 2 33 33 34 16 26 39 48 33 45 9 27 28 44 33 21 38 26 13 13 33 57 48 26 12 57 32 26 55 20 0 37 58 140 -49 26 24 10 32 21 32 26 1 42 32 32 18 26 50 3 32 9 4 25 35 26 32 44 46 25 34 47 31 14 49 20 0 51 58 138 -49 25 45 53 31 9 31 25 23 40 31 20 8 26 11 29 30 57 11 24 57 41 31 32 28 24 56 39 30 3 22 20 1 5 59 136 -49 25 7 38 29 58 7 24 45 38 30 8 38 25 32 58 29 45 56 24 19 57 30 20 49 24 18 30 28 52 31 20 1 19 59 134 -50 24 29 22 28 47 19 24 7 36 28 57 43 24 54 27 28 35 16 23 42 10 29 9 46 23 40 17 27 42 13 20 1 33 60 131 -50 23 51 3 27 37 4 23 29 29 27 47 22 24 15 55 27 25 8 23 4 18 27 59 17 23 1 58 26 32 25 20 1 47 60 129 -50 23 12 39 26 27 20 22 51 16 26 37 31 23 37 18 26 15 30 22 26 18 26 49 19 22 23 31 25 23 5 20 2 0 60 127 -50 22 34 6 25 18 2 22 12 54 25 28 8 22 58 33 25 6 20 21 48 8 25 39 50 21 44 52 24 14 11 20 2 14 60 124 -50 21 55 23 24 9 11 21 34 20 24 19 11 22 19 39 23 57 34 21 9 45 24 30 47 21 6 0 23 5 40 20 2 28 61 122 -50 21 16 27 23 0 42 20 55 32 23 10 37 21 40 33 22 49 11 20 31 8 23 22 7 20 26 52 21 57 30 20 2 42 61 119 -50 20 37 15 21 52 34 20 16 28 22 2 25 21 1 12 21 41 9 19 52 13 22 13 49 19 47 26 20 49 39 20 2 56 61 117 -50 19 57 45 20 44 46 19 37 6 20 54 32 20 21 34 20 33 26 19 12 59 21 5 51 19 7 39 19 42 5 20 3 10 61 114 -50 19 17 55 19 37 14 18 57 22 19 46 56 19 41 36 19 25 59 18 33 24 19 58 11 18 27 29 18 34 47 20 3 24 61 112 -50 18 37 41 18 29 58 18 17 15 18 39 36 19 1 16 18 18 47 17 53 23 18 50 46 17 46 53 17 27 42 20 3 38 61 109 -49 17 57 3 17 22 55 17 36 41 17 32 29 18 20 31 17 11 48 17 12 56 17 43 35 17 5 48 16 20 49 20 3 52 60 107 -49 17 15 56 16 16 4 16 55 39 16 25 34 17 39 19 16 5 1 16 31 59 16 36 36 16 24 12 15 14 6 20 4 6 60 105 -49 16 34 17 15 9 22 16 14 5 15 18 49 16 57 36 14 58 23 15 50 30 15 29 47 15 42 2 14 7 30 20 4 19 60 102 -48 15 52 6 14 2 48 15 31 56 14 12 12 16 15 20 13 51 52 15 8 25 14 23 6 14 59 14 13 1 1 20 4 33 59 100 -48 15 9 17 12 56 20 14 49 10 13 5 42 15 32 28 12 45 28 14 25 42 13 16 33 14 15 46 11 54 37 20 4 47 59 98 -48 14 25 48 11 49 57 14 5 43 11 59 16 14 48 57 11 39 8 13 42 18 12 10 4 13 31 34 10 48 16 20 5 1 58 96 -47 13 41 35 10 43 37 13 21 32 10 52 54 14 4 43 10 32 51 12 58 8 11 3 38 12 46 35 9 41 56 20 5 15 58 94 -46 12 56 35 9 37 19 12 36 33 9 46 33 13 19 42 9 26 35 12 13 10 9 57 14 12 0 44 8 35 35 20 5 29 57 92 -46 12 10 45 8 30 59 11 50 42 8 40 11 12 33 51 8 20 18 11 27 20 8 50 50 11 13 58 7 29 13 20 5 43 56 90 -45 11 23 59 7 24 38 11 3 56 7 33 48 11 47 6 7 13 59 10 40 33 7 44 24 10 26 12 6 22 46 20 5 57 56 89 -45 10 36 13 6 18 12 10 16 9 6 27 20 10 59 21 6 7 35 9 52 44 6 37 55 9 37 20 5 16 14 20 6 11 55 87 -44 9 47 22 5 11 41 9 27 17 5 20 47 10 10 33 5 1 6 9 3 49 5 31 20 8 47 19 4 9 34 20 6 25 54 86 -43 8 57 22 4 5 2 8 37 13 4 14 6 9 20 36 3 54 29 8 13 43 4 24 37 7 56 1 3 2 45 20 6 38 53 84 -42 8 6 6 2 58 13 7 45 54 3 7 16 8 29 24 2 47 42 7 22 19 3 17 45 7 3 20 1 55 44 20 6 52 52 83 -41 7 13 28 1 51 13 6 53 11 2 0 15 7 36 51 1 40 43 6 29 31 2 10 42 6 9 10 0 48 30 20 7 6 51 81 -40 6 19 20 0 44 0 5 58 58 0 53 0 6 42 49 0 33 31 5 35 11 1 3 26 5 13 22 - 0 19 0 20 7 20 50 80 -40 5 23 35 - 0 23 30 5 3 6 - 0 14 30 5 47 12 - 0 33 57 4 39 12 - 0 4 6 4 15 47 - 1 26 48 20 7 34 49 79 -39 4 26 4 - 1 31 17 4 5 28 - 1 22 19 4 49 49 - 1 41 43 3 41 24 - 1 11 56 3 16 16 - 2 34 56 20 7 48 48 78 -37 3 26 37 - 2 39 25 3 5 52 - 2 30 27 3 50 32 - 2 49 50 2 41 38 - 2 20 6 2 14 36 - 3 43 27 20 8 2 47 77 -36 2 25 3 - 3 47 56 2 4 7 - 3 38 59 2 49 10 - 3 58 20 1 39 41 - 3 28 38 1 10 36 - 4 52 24 20 8 16 45 76 -35 1 21 8 - 4 56 52 1 0 1 - 4 47 57 1 45 29 - 5 7 15 0 35 20 - 4 37 37 0 4 0 - 6 1 50 20 8 30 44 76 -34 0 14 39 - 6 6 18 - 0 6 42 - 5 57 23 0 39 15 - 6 16 40 - 0 31 39 - 5 47 4 - 1 5 30 - 7 11 49 20 8 43 43 75 -33 - 0 54 42 - 7 16 16 - 1 16 19 - 7 7 22 - 0 29 49 - 7 26 37 - 1 41 35 - 6 57 4 - 2 18 12 - 8 22 23 20 8 57 41 74 -32 - 2 7 16 - 8 26 50 - 2 29 11 - 8 17 57 - 1 42 2 - 8 37 10 - 2 54 49 - 8 7 40 - 3 34 31 - 9 33 38 20 9 11 40 74 -30 - 3 23 25 - 9 38 4 - 3 45 41 - 9 29 12 - 2 57 47 - 9 48 24 - 4 11 44 - 9 18 57 - 4 54 57 -10 45 38 20 9 25 38 73 -29 - 4 43 37 -10 50 3 - 5 6 18 -10 41 12 - 4 17 32 -11 0 22 - 5 32 51 -10 30 59 - 6 20 2 -11 58 28 20 9 39 37 73 -27 - 6 8 28 -12 2 53 - 6 31 38 -11 54 4 - 5 41 51 -12 13 11 - 6 58 46 -11 43 52 - 7 50 30 -13 12 16 20 9 53 35 73 -26 - 7 38 40 -13 16 41 - 8 2 24 -13 7 53 - 7 11 24 -13 26 56 - 8 30 13 -12 57 43 - 9 27 15 -14 27 10 20 10 7 33 73 -24 - 9 15 4 -14 31 33 - 9 39 30 -14 22 47 - 8 47 2 -14 41 46 - 10 8 9 -14 12 40 - 11 11 27 -15 43 18 20 10 21 31 73 -22 - 10 58 51 -15 47 40 - 11 24 7 -15 38 57 - 10 29 53 -15 57 50 - 11 53 47 -15 28 53 - 13 4 37 -17 0 53 20 10 35 29 73 -20 - 12 51 30 -17 5 13 - 13 17 49 -16 56 34 - 12 21 22 -17 15 20 - 13 48 45 -16 46 36 - 15 8 52 -18 20 12 20 10 49 27 73 -18 - 14 55 5 -18 24 30 - 15 22 44 -18 15 56 - 14 23 28 -18 34 30 - 15 55 20 -18 6 4 - 17 27 15 -19 41 37 20 11 2 25 73 -16 - 17 12 35 -19 45 51 - 17 42 2 -19 37 25 - 16 39 1 -19 55 43 - 18 16 51 -19 27 44 - 20 4 30 -21 5 42 20 11 16 22 74 -13 - 19 48 36 -21 9 49 - 20 20 35 -21 1 36 - 19 12 16 -21 19 28 - 20 58 33 -20 52 11 - 23 8 41 -22 33 22 20 11 30 19 75 -10 - 22 50 52 -22 37 19 - 23 26 45 -22 29 27 - 22 10 23 -22 46 36 - 24 9 40 -22 20 29 - 26 55 58 -24 6 25 20 11 44 15 76 -7 - 26 34 44 -24 10 2 - 27 17 39 -24 2 51 - 25 46 59 -24 18 37 - 28 9 46 -23 54 47 - 32 11 17 -25 49 42 20 11 58 10 78 -2 - 31 41 23 -25 52 26 - 32 42 30 -25 47 6 - 30 36 19 -25 59 17 - 34 1 15 -25 41 47 Uncertainty in time = +/- 5 secs Prediction of 2012 Sep 27.0 Data for the target star ------------------------ * name: TYC 0592-00384-1 * constellation : Pisces * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 23 45 07.7223 DE: +05 52 52.892 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .029, .025 ) * V mag [mag]: 11.5 * B mag [mag]: 13.1 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (923) Herluga approx. diameter [km]: 35 approx. diameter ["]: .041 distance from Earth [AU]: 1.18000 * orbital information: orbit source: Preston date of fit: 2012 Sep 26 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 916 number of rejected observations: 21 time covered by the observations: 1919 Dec 10 - 2012 Sep 15 1 sigma uncertainty ellipse (major, minor, PA): 0.044, 0.031, 79° remarks: * orbital elements for (923) Herluga : Mean anomaly = 335.37096760 deg Arg. of pericenter = 201.49720081 deg Long. of node = 197.68295725 deg Inclination = 14.47800410 deg Eccentricity = 0.19647240 Semimajor axis = 2.61408377 AU Perihelion dist = 2.10048847 AU Mag: H = 11.45, G = 0.15 Epoch of elements : MJD 56200.83500000 TDT (2012 Sep 30.835) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Sep 30 923 Herluga 20h 2.9m UT 11.5 23 45 7.722 5 52 52.89TYC 0592-00384-1 13.1 14.0 35 3.5 1.180 -1.537 -35.54 45.5794 5.892 -123.30 -3.20 20.0489 -0.40932 0.26418 -3.07773 -4.76893 0.00102 -0.00025 2000 335.1762482012 930.00000201.497201197.682957 14.4780040.19647240 2.6140838 2.100488511.5 5.00.15 RATE 2.3319800 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.053 0.040 82 2.16 0.047 0 0 3 2 056197.0020120930_0384-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Sep 26, 21:51 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org