IOTA/IOTA-ES occultation update for (422) Berolina / TYC 6840-00419-1 event on 2012 Sep 17, 14:07 UT Visible from Australia Summary ------- On 2012 Sep 17 UT, the 12 km diameter asteroid (422) Berolina will occult a 10.0 mag star in the constellation Sagittarius for observers along a path across Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.4 mag to 14.4 mag (the magnitude of the asteroid) for at most 0.7 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: 28 * date and approx. time of event: 2012 Sep 17, 14:06 - 2012 Sep 17, 14:12 UT * geocentric midpoint of event [JD]: 2456188.08826667 * magnitude of target star: 10.0 * magnitude drop [mag]: 4.4 * estimated maximum duration [s]: 0.7 * Moon: 3 % sunlit, 72° distance * Sun: 92° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 13 * 1 sigma uncertainty interval [path widths]: +/- 2.42 * 1 sigma uncertainty interval [seconds]: +/- 1.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .036 +/- .026) * 1 sigma uncertainty ellipse (major, minor, PA): ( .036", .026", 91° ) * approx speed of asteroid's shadow [km/s]: 17.5511 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6840-00419-1 by 422 Berolina on 2012 Sep 17 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 55 0 0 -48 30 2 14 6 38 70 9 0 -48 33 29 -48 26 36 -48 50 8 -48 9 59 56 0 0 -48 26 9 14 6 42 70 6 -1 -48 29 36 -48 22 43 -48 46 17 -48 6 5 57 0 0 -48 21 54 14 6 47 71 4 -2 -48 25 20 -48 18 27 -48 42 2 -48 1 48 58 0 0 -48 17 15 14 6 51 71 1 -2 -48 20 42 -48 13 48 -48 37 24 -47 57 7 59 0 0 -48 12 12 14 6 55 71 358 -3 -48 15 40 -48 8 45 -48 32 24 -47 52 4 60 0 0 -48 6 47 14 7 0 71 356 -4 -48 10 14 -48 3 20 -48 27 0 -47 46 37 61 0 0 -48 0 58 14 7 4 71 353 -4 -48 4 26 -47 57 30 -48 21 12 -47 40 46 62 0 0 -47 54 46 14 7 8 71 350 -5 -47 58 14 -47 51 18 -48 15 2 -47 34 32 63 0 0 -47 48 10 14 7 13 71 347 -6 -47 51 38 -47 44 41 -48 8 28 -47 27 54 64 0 0 -47 41 10 14 7 17 71 344 -6 -47 44 38 -47 37 41 -48 1 30 -47 20 52 65 0 0 -47 33 46 14 7 22 71 342 -7 -47 37 15 -47 30 17 -47 54 8 -47 13 26 66 0 0 -47 25 58 14 7 26 71 339 -8 -47 29 28 -47 22 29 -47 46 23 -47 5 37 67 0 0 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0 -44 49 47 -45 14 28 -44 32 22 81 0 0 -44 39 17 14 8 35 66 302 -19 -44 42 54 -44 35 40 -45 0 25 -44 18 11 82 0 0 -44 24 43 14 8 39 65 300 -19 -44 28 21 -44 21 6 -44 45 55 -44 3 35 83 0 0 -44 9 43 14 8 44 65 298 -20 -44 13 22 -44 6 5 -44 30 58 -43 48 31 84 0 0 -43 54 16 14 8 49 64 296 -21 -43 57 55 -43 50 38 -44 15 35 -43 33 0 85 0 0 -43 38 22 14 8 54 64 294 -22 -43 42 2 -43 34 43 -43 59 45 -43 17 3 86 0 0 -43 22 1 14 8 58 63 293 -23 -43 25 41 -43 18 21 -43 43 27 -43 0 37 87 0 0 -43 5 12 14 9 3 63 291 -23 -43 8 53 -43 1 32 -43 26 43 -42 43 45 88 0 0 -42 47 56 14 9 8 62 289 -24 -42 51 38 -42 44 15 -43 9 30 -42 26 25 89 0 0 -42 30 12 14 9 13 62 288 -25 -42 33 54 -42 26 30 -42 51 50 -42 8 37 90 0 0 -42 12 1 14 9 17 61 286 -26 -42 15 43 -42 8 18 -42 33 43 -41 50 22 91 0 0 -41 53 21 14 9 22 60 284 -27 -41 57 5 -41 49 38 -42 15 7 -41 31 38 92 0 0 -41 34 14 14 9 27 60 283 -27 -41 37 58 -41 30 30 -41 56 4 -41 12 27 93 0 0 -41 14 38 14 9 32 59 281 -28 -41 18 23 -41 10 53 -41 36 32 -40 52 47 94 0 0 -40 54 34 14 9 37 58 280 -29 -40 58 20 -40 50 49 -41 16 33 -40 32 39 95 0 0 -40 34 3 14 9 41 57 279 -30 -40 37 49 -40 30 16 -40 56 5 -40 12 3 96 0 0 -40 13 2 14 9 46 57 277 -31 -40 16 49 -40 9 16 -40 35 9 -39 50 59 97 0 0 -39 51 34 14 9 51 56 276 -32 -39 55 22 -39 47 46 -40 13 45 -39 29 27 98 0 0 -39 29 37 14 9 56 55 275 -32 -39 33 26 -39 25 49 -39 51 52 -39 7 26 99 0 0 -39 7 12 14 10 1 55 273 -33 -39 11 1 -39 3 23 -39 29 31 -38 44 57 100 0 0 -38 44 19 14 10 5 54 272 -34 -38 48 9 -38 40 29 -39 6 42 -38 21 59 101 0 0 -38 20 58 14 10 10 53 271 -35 -38 24 48 -38 17 7 -38 43 25 -37 58 34 102 0 0 -37 57 8 14 10 15 52 270 -36 -38 0 59 -37 53 17 -38 19 39 -37 34 40 103 0 0 -37 32 51 14 10 20 51 269 -37 -37 36 42 -37 28 59 -37 55 26 -37 10 19 104 0 0 -37 8 5 14 10 24 51 268 -38 -37 11 58 -37 4 13 -37 30 44 -36 45 30 105 0 0 -36 42 52 14 10 29 50 266 -39 -36 46 45 -36 38 59 -37 5 35 -36 20 13 106 0 0 -36 17 11 14 10 34 49 265 -40 -36 21 5 -36 13 18 -36 39 58 -35 54 28 107 0 0 -35 51 3 14 10 39 48 264 -41 -35 54 58 -35 47 9 -36 13 54 -35 28 16 108 0 0 -35 24 28 14 10 43 47 263 -42 -35 28 23 -35 20 33 -35 47 23 -35 1 38 109 0 0 -34 57 27 14 10 48 46 263 -42 -35 1 22 -34 53 31 -35 20 24 -34 34 32 110 0 0 -34 29 58 14 10 52 45 262 -43 -34 33 55 -34 26 2 -34 53 0 -34 7 0 111 0 0 -34 2 4 14 10 57 44 261 -44 -34 6 1 -33 58 7 -34 25 9 -33 39 2 112 0 0 -33 33 44 14 11 2 44 260 -45 -33 37 41 -33 29 46 -33 56 52 -33 10 39 113 0 0 -33 4 58 14 11 6 43 259 -46 -33 8 56 -33 1 0 -33 28 10 -32 41 50 114 0 0 -32 35 48 14 11 10 42 258 -47 -32 39 46 -32 31 49 -32 59 3 -32 12 37 115 0 0 -32 6 13 14 11 15 41 257 -48 -32 10 12 -32 2 14 -32 29 31 -31 42 59 116 0 0 -31 36 15 14 11 19 40 257 -49 -31 40 14 -31 32 15 -31 59 35 -31 12 57 117 0 0 -31 5 53 14 11 23 39 256 -50 -31 9 53 -31 1 53 -31 29 16 -30 42 33 118 0 0 -30 35 8 14 11 28 38 255 -51 -30 39 9 -30 31 8 -30 58 34 -30 11 46 119 0 0 -30 4 2 14 11 32 37 254 -52 -30 8 3 -30 0 1 -30 27 30 -29 40 37 120 0 0 -29 32 34 14 11 36 36 254 -53 -29 36 35 -29 28 33 -29 56 5 -29 9 6 121 0 0 -29 0 45 14 11 40 35 253 -54 -29 4 47 -28 56 44 -29 24 19 -28 37 16 122 0 0 -28 28 37 14 11 44 34 252 -55 -28 32 39 -28 24 35 -28 52 12 -28 5 5 123 0 0 -27 56 9 14 11 48 33 252 -56 -28 0 12 -27 52 7 -28 19 47 -27 32 36 124 0 0 -27 23 24 14 11 52 32 251 -57 -27 27 26 -27 19 21 -27 47 3 -26 59 48 125 0 0 -26 50 21 14 11 55 31 250 -58 -26 54 24 -26 46 18 -27 14 1 -26 26 44 126 0 0 -26 17 1 14 11 59 30 250 -59 -26 21 4 -26 12 58 -26 40 43 -25 53 23 127 0 0 -25 43 26 14 12 2 29 249 -60 -25 47 29 -25 39 22 -26 7 9 -25 19 46 128 0 0 -25 9 36 14 12 6 28 249 -61 -25 13 40 -25 5 33 -25 33 21 -24 45 55 129 0 0 -24 35 33 14 12 9 27 248 -62 -24 39 36 -24 31 29 -24 59 18 -24 11 51 130 0 0 -24 1 17 14 12 12 26 248 -63 -24 5 21 -23 57 13 -24 25 3 -23 37 35 131 0 0 -23 26 49 14 12 15 24 247 -64 -23 30 53 -23 22 45 -23 50 36 -23 3 7 132 0 0 -22 52 11 14 12 18 23 247 -65 -22 56 15 -22 48 7 -23 15 58 -22 28 28 133 0 0 -22 17 24 14 12 21 22 246 -66 -22 21 28 -22 13 20 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16 2 147 0 0 -14 4 33 14 12 48 7 242 -78 -14 8 34 -14 0 32 -14 28 3 -13 41 6 148 0 0 -13 29 42 14 12 48 6 241 -78 -13 33 43 -13 25 41 -13 53 10 -13 6 18 149 0 0 -12 55 0 14 12 49 4 241 -78 -12 59 1 -12 51 0 -13 18 26 -12 31 38 150 0 0 -12 20 28 14 12 50 3 241 -79 -12 24 28 -12 16 29 -12 43 52 -11 57 9 151 0 0 -11 46 8 14 12 50 2 241 -79 -11 50 7 -11 42 8 -12 9 28 .. .. .. 152 0 0 -11 11 59 14 12 50 1 240 -79 -11 15 58 -11 8 0 -11 35 17 .. .. .. Uncertainty in time = +/- 2 secs Prediction of 2012 Aug 26.0 Data for the target star ------------------------ * name: TYC 6840-00419-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 47 15.1574 DE: -29 07 01.085 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .031, .024 ) * V mag [mag]: 10.0 * B mag [mag]: 12.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (422) Berolina approx. diameter [km]: 12 approx. diameter ["]: .011 distance from Earth [AU]: 1.50600 * orbital information: orbit source: Preston date of fit: 2012 Aug 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1125 number of rejected observations: 77 time covered by the observations: 1906 Oct 11 - 2012 Aug 06 1 sigma uncertainty ellipse (major, minor, PA): 0.017, 0.011, 94° remarks: * orbital elements for (422) Berolina : Mean anomaly = 331.05246325 deg Arg. of pericenter = 335.23412876 deg Long. of node = 9.17771442 deg Inclination = 4.99673052 deg Eccentricity = 0.21363754 Semimajor axis = 2.22852485 AU Perihelion dist = 1.75242827 AU Mag: H = 10.66, G = 0.15 Epoch of elements : MJD 56187.58800000 TDT (2012 Sep 17.588) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Sep 17 422 Berolina 14h 7.1m UT 10.0 17 47 15.157-29 7 1.08TYC 6840-00419-1 12.0 14.4 12 0.7 1.506 4.384 6.64 58.1257 -29.119 -33.19 1.95 14.1184 0.03708 -0.31975 9.84073 1.13801 0.00503 -0.00009 2000 328.8044172012 910.00000335.234129 9.177714 4.9967310.21363754 2.2285249 1.752428310.8 5.00.15 RATE 2.9626330 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.036 0.026 91 3.42 0.027 0 0 4-5 056165.0020120917_0419-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Aug 25, 22:56 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org