IOTA/IOTA-ES occultation update for (2093) Genichesk / TYC 5625-00170-1 event on 2012 Aug 06, 15:58 UT Visible from Indonesia, Arabia Summary ------- On 2012 Aug 06 UT, the 10 km diameter asteroid (2093) Genichesk will occult a 9.6 mag star in the constellation Scorpius for observers along a path across Indonesia, Arabia. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.2 mag to 15.8 mag (the magnitude of the asteroid) for at most 0.9 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: 16 * date and approx. time of event: 2012 Aug 06, 15:54 - 2012 Aug 06, 16:07 UT * geocentric midpoint of event [JD]: 2456146.16565 * magnitude of target star: 9.6 * magnitude drop [mag]: 6.2 * estimated maximum duration [s]: 0.9 * Moon: 78 % sunlit, 125° distance * Sun: 110° distance * rough path description: Indonesia, Arabia The occultation path -------------------- * approximate projected width [km]: 11 * 1 sigma uncertainty interval [path widths]: +/- 4.17 * 1 sigma uncertainty interval [seconds]: +/- 4.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .054 +/- .045) * 1 sigma uncertainty ellipse (major, minor, PA): ( .054", .045", 97° ) * approx speed of asteroid's shadow [km/s]: 11.0015 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5625-00170-1 by 2093 Genichesk on 2012 Aug 6 Centre Star Star Sun Path Limits Error Limits E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Latitude Latitude Latitude Latitude 41 0 0 22 56 32 15 54 36 53 166 -1 22 52 51 23 0 14 22 22 8 23 31 8 42 0 0 22 17 42 15 54 47 54 167 -2 22 14 1 22 21 23 21 43 22 22 52 14 43 0 0 21 38 57 15 54 58 54 169 -3 21 35 16 21 42 38 21 4 41 22 13 25 44 0 0 21 0 19 15 55 8 55 170 -4 20 56 39 21 3 59 20 26 7 21 34 42 45 0 0 20 21 48 15 55 19 56 172 -5 20 18 9 20 25 28 19 47 42 20 56 7 46 0 0 19 43 28 15 55 30 57 173 -7 19 39 49 19 47 7 19 9 26 20 17 42 47 0 0 19 5 19 15 55 42 57 175 -8 19 1 40 19 8 57 18 31 22 19 39 27 48 0 0 18 27 22 15 55 53 58 177 -9 18 23 44 18 31 0 17 53 31 19 1 25 49 0 0 17 49 40 15 56 4 59 179 -10 17 46 2 17 53 17 17 15 55 18 23 37 50 0 0 17 12 13 15 56 16 59 181 -11 17 8 36 17 15 50 16 38 34 17 46 4 51 0 0 16 35 3 15 56 27 60 183 -12 16 31 27 16 38 40 16 1 30 17 8 48 52 0 0 15 58 12 15 56 39 61 185 -14 15 54 37 16 1 48 15 24 45 16 31 51 53 0 0 15 21 41 15 56 50 61 187 -15 15 18 6 15 25 16 14 48 20 15 55 13 54 0 0 14 45 30 15 57 2 62 190 -16 14 41 56 14 49 5 14 12 17 15 18 55 55 0 0 14 9 42 15 57 14 62 192 -17 14 6 9 14 13 16 13 36 35 14 43 1 56 0 0 13 34 18 15 57 26 62 194 -18 13 30 45 13 37 50 13 1 18 14 7 29 57 0 0 12 59 18 15 57 38 63 197 -19 12 55 46 13 2 50 12 26 25 13 32 22 58 0 0 12 24 44 15 57 49 63 199 -20 12 21 13 12 28 15 11 51 58 12 57 41 59 0 0 11 50 37 15 58 1 63 202 -22 11 47 6 11 54 7 11 17 58 12 23 27 60 0 0 11 16 57 15 58 13 63 204 -23 11 13 28 11 20 27 10 44 26 11 49 40 61 0 0 10 43 47 15 58 25 63 207 -24 10 40 18 10 47 16 10 11 22 11 16 22 62 0 0 10 11 6 15 58 37 63 209 -25 10 7 38 10 14 34 9 38 49 10 43 34 63 0 0 9 38 56 15 58 48 63 212 -26 9 35 29 9 42 24 9 6 46 10 11 17 64 0 0 9 7 18 15 59 0 63 214 -27 9 3 51 9 10 44 8 35 15 9 39 31 65 0 0 8 36 11 15 59 12 63 216 -29 8 32 46 8 39 37 8 4 16 9 8 17 66 0 0 8 5 38 15 59 23 62 219 -30 8 2 13 8 9 3 7 33 50 8 37 36 67 0 0 7 35 38 15 59 35 62 221 -31 7 32 14 7 39 2 7 3 58 8 7 29 68 0 0 7 6 13 15 59 47 62 223 -32 7 2 50 7 9 36 6 34 40 7 37 56 69 0 0 6 37 22 15 59 58 61 225 -33 6 34 0 6 40 45 6 5 56 7 8 58 70 0 0 6 9 7 16 0 9 61 227 -34 6 5 46 6 12 29 5 37 49 6 40 36 71 0 0 5 41 28 16 0 21 61 229 -36 5 38 7 5 44 49 5 10 16 6 12 49 72 0 0 5 14 25 16 0 32 60 231 -37 5 11 5 5 17 46 4 43 21 5 45 39 73 0 0 4 47 59 16 0 43 60 233 -38 4 44 40 4 51 19 4 17 2 5 19 6 74 0 0 4 22 10 16 0 54 59 235 -39 4 18 52 4 25 29 3 51 20 4 53 10 75 0 0 3 56 59 16 1 5 58 236 -40 3 53 41 4 0 17 3 26 15 4 27 52 76 0 0 3 32 26 16 1 15 58 238 -41 3 29 9 3 35 43 3 1 48 4 3 12 77 0 0 3 8 30 16 1 26 57 239 -42 3 5 14 3 11 47 2 38 0 3 39 10 78 0 0 2 45 13 16 1 37 56 241 -43 2 41 58 2 48 29 2 14 49 3 15 47 79 0 0 2 22 35 16 1 47 56 242 -44 2 19 20 2 25 50 1 52 17 2 53 2 80 0 0 2 0 35 16 1 57 55 243 -46 1 57 21 2 3 50 1 30 24 2 30 56 81 0 0 1 39 15 16 2 7 54 244 -47 1 36 1 1 42 29 1 9 9 2 9 29 82 0 0 1 18 33 16 2 17 53 245 -48 1 15 20 1 21 46 0 48 33 1 48 41 83 0 0 0 58 31 16 2 27 52 246 -49 0 55 18 1 1 43 0 28 37 1 28 33 84 0 0 0 39 8 16 2 37 52 247 -50 0 35 56 0 42 20 0 9 19 1 9 4 85 0 0 0 20 24 16 2 47 51 248 -51 0 17 13 0 23 35 - 0 9 19 0 50 15 86 0 0 0 2 20 16 2 56 50 249 -52 - 0 0 51 0 5 31 - 0 27 18 0 32 6 87 0 0 - 0 15 5 16 3 5 49 250 -53 - 0 18 15 - 0 11 55 - 0 44 37 0 14 36 88 0 0 - 0 31 50 16 3 14 48 250 -54 - 0 35 0 - 0 28 41 - 1 1 18 - 0 2 15 89 0 0 - 0 47 56 16 3 23 47 251 -55 - 0 51 5 - 0 44 47 - 1 17 19 - 0 18 25 90 0 0 - 1 3 22 16 3 32 46 252 -56 - 1 6 31 - 1 0 14 - 1 32 40 - 0 33 56 91 0 0 - 1 18 9 16 3 41 45 252 -57 - 1 21 17 - 1 15 1 - 1 47 23 - 0 48 48 92 0 0 - 1 32 17 16 3 49 44 253 -58 - 1 35 24 - 1 29 9 - 2 1 26 - 1 3 0 93 0 0 - 1 45 45 16 3 58 44 253 -59 - 1 48 52 - 1 42 37 - 2 14 50 - 1 16 32 94 0 0 - 1 58 33 16 4 6 43 253 -60 - 2 1 40 - 1 55 26 - 2 27 34 - 1 29 24 95 0 0 - 2 10 42 16 4 14 42 254 -61 - 2 13 49 - 2 7 36 - 2 39 40 - 1 41 37 96 0 0 - 2 22 12 16 4 22 41 254 -62 - 2 25 18 - 2 19 6 - 2 51 6 - 1 53 11 97 0 0 - 2 33 3 16 4 30 40 255 -63 - 2 36 9 - 2 29 57 - 3 1 53 - 2 4 5 98 0 0 - 2 43 15 16 4 37 39 255 -64 - 2 46 20 - 2 40 9 - 3 12 2 - 2 14 20 99 0 0 - 2 52 47 16 4 44 38 255 -65 - 2 55 52 - 2 49 42 - 3 21 31 - 2 23 56 100 0 0 - 3 1 41 16 4 52 37 255 -66 - 3 4 46 - 2 58 36 - 3 30 22 - 2 32 53 101 0 0 - 3 9 56 16 4 58 36 256 -67 - 3 13 0 - 3 6 52 - 3 38 34 - 2 41 10 102 0 0 - 3 17 32 16 5 5 35 256 -68 - 3 20 36 - 3 14 28 - 3 46 8 - 2 48 49 103 0 0 - 3 24 29 16 5 12 34 256 -69 - 3 27 33 - 3 21 25 - 3 53 3 - 2 55 48 104 0 0 - 3 30 48 16 5 18 33 256 -70 - 3 33 52 - 3 27 44 - 3 59 19 - 3 2 9 105 0 0 - 3 36 28 16 5 25 32 256 -70 - 3 39 31 - 3 33 25 - 4 4 58 - 3 7 51 106 0 0 - 3 41 30 16 5 31 31 257 -71 - 3 44 33 - 3 38 27 - 4 9 58 - 3 12 55 107 0 0 - 3 45 53 16 5 37 30 257 -72 - 3 48 56 - 3 42 50 - 4 14 19 - 3 17 20 108 0 0 - 3 49 38 16 5 42 29 257 -73 - 3 52 41 - 3 46 35 - 4 18 3 - 3 21 6 109 0 0 - 3 52 45 16 5 48 28 257 -73 - 3 55 48 - 3 49 42 - 4 21 9 - 3 24 14 110 0 0 - 3 55 14 16 5 53 27 257 -74 - 3 58 17 - 3 52 11 - 4 23 37 - 3 26 44 111 0 0 - 3 57 5 16 5 59 26 257 -75 - 4 0 7 - 3 54 2 - 4 25 27 - 3 28 36 112 0 0 - 3 58 18 16 6 4 25 257 -75 - 4 1 20 - 3 55 15 - 4 26 39 - 3 29 49 113 0 0 - 3 58 53 16 6 8 24 257 -76 - 4 1 55 - 3 55 51 - 4 27 14 - 3 30 25 114 0 0 - 3 58 51 16 6 13 23 257 -76 - 4 1 53 - 3 55 48 - 4 27 11 - 3 30 23 115 0 0 - 3 58 10 16 6 18 22 257 -77 - 4 1 13 - 3 55 8 - 4 26 31 - 3 29 43 116 0 0 - 3 56 53 16 6 22 21 257 -77 - 3 59 55 - 3 53 50 - 4 25 13 - 3 28 25 117 0 0 - 3 54 57 16 6 26 20 257 -77 - 3 58 0 - 3 51 55 - 4 23 18 - 3 26 30 118 0 0 - 3 52 25 16 6 30 19 257 -77 - 3 55 27 - 3 49 22 - 4 20 46 - 3 23 56 119 0 0 - 3 49 15 16 6 34 18 257 -77 - 3 52 17 - 3 46 12 - 4 17 37 - 3 20 46 120 0 0 - 3 45 28 16 6 37 17 257 -77 - 3 48 30 - 3 42 25 - 4 13 50 - 3 16 58 121 0 0 - 3 41 4 16 6 40 16 257 -77 - 3 44 6 - 3 38 1 - 4 9 27 - 3 12 33 122 0 0 - 3 36 2 16 6 43 15 257 -77 - 3 39 5 - 3 32 59 - 4 4 27 - 3 7 30 123 0 0 - 3 30 24 16 6 46 14 257 -77 - 3 33 27 - 3 27 21 - 3 58 50 - 3 1 51 124 0 0 - 3 24 9 16 6 49 13 257 -76 - 3 27 12 - 3 21 6 - 3 52 36 - 2 55 34 125 0 0 - 3 17 17 16 6 52 12 257 -76 - 3 20 20 - 3 14 13 - 3 45 46 - 2 48 41 126 0 0 - 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Uncertainty in time = +/- 5 secs Prediction of 2012 Jul 21.0 Data for the target star ------------------------ * name: TYC 5625-00170-1 * constellation : Scorpius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 16 15 46.8936 DE: -13 23 25.278 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .028, .025 ) * V mag [mag]: 9.6 * B mag [mag]: 11.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2093) Genichesk approx. diameter [km]: 10 approx. diameter ["]: .011 distance from Earth [AU]: 1.28200 * orbital information: orbit source: Preston date of fit: 2012 Jul 21 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1008 number of rejected observations: 24 time covered by the observations: 1950 Apr 17 - 2012 Jul 19 1 sigma uncertainty ellipse (major, minor, PA): 0.046, 0.037, 99° remarks: * orbital elements for (2093) Genichesk : Mean anomaly = 1.48504876 deg Arg. of pericenter = 117.75958055 deg Long. of node = 154.92384267 deg Inclination = 6.08578365 deg Eccentricity = 0.16897887 Semimajor axis = 2.26906346 AU Perihelion dist = 1.88563969 AU Mag: H = 12.83, G = 0.15 Epoch of elements : MJD 56145.66500000 TDT (2012 Aug 06.665) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Aug 6 2093 Genichesk 15h 58.5m UT 9.6 16 15 46.894-13 23 25.28TYC 5625-00170-1 11.0 15.8 10 0.9 1.282 2.577 -20.01 48.7199 -13.384 -58.18 16.46 15.9756 0.21656 0.39699 5.48110 -2.91824 0.00451 -0.00105 2000 359.8514932012 8 1.00000117.759581154.923843 6.0857840.16897887 2.2690635 1.885639712.6 5.00.15 RATE 2.8835940 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.054 0.045 97 5.17 0.045 0 0-4 2 056129.0020120806_0170-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 21, 14:14 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org