IOTA/IOTA-ES occultation update for (1004) Belopolskya / TYC 1355-01006-1 event on 2012 Dec 07, 19:43 UT Visible from Russia, Europe Summary ------- On 2012 Dec 07 UT, the 80 km diameter asteroid (1004) Belopolskya will occult a 11.2 mag star in the constellation Gemini for observers along a path across Russia, Europe. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.1 mag to 15.3 mag (the magnitude of the asteroid) for at most 8.5 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 81 * date and approx. time of event: 2012 Dec 07, 19:36 - 2012 Dec 07, 19:52 UT * geocentric midpoint of event [JD]: 2456269.32207083 * magnitude of target star: 11.2 * magnitude drop [mag]: 4.1 * estimated maximum duration [s]: 8.5 * Moon: 38 % sunlit, 70° distance * Sun: 146° distance * rough path description: Russia, Europe The occultation path -------------------- * approximate projected width [km]: 102 * 1 sigma uncertainty interval [path widths]: +/- 0.65 * 1 sigma uncertainty interval [seconds]: +/- 6.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .035 +/- .029) * 1 sigma uncertainty ellipse (major, minor, PA): ( .035", .029", 93° ) * approx speed of asteroid's shadow [km/s]: 9.4345 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1355-01006-1 by 1004 Belopolskya on 2012 Dec 7 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 - 11 0 0 42 22 11 19 52 36 0 65 -29 42 52 36 41 52 0 43 32 30 .. .. .. - 10 0 0 42 43 30 19 52 35 1 65 -30 43 13 54 42 13 19 43 53 47 .. .. .. - 9 0 0 43 4 39 19 52 35 2 66 -30 43 35 2 42 34 29 44 14 54 .. .. .. - 8 0 0 43 25 37 19 52 34 3 67 -31 43 56 0 42 55 28 44 35 51 42 16 36 - 7 0 0 43 46 24 19 52 34 4 68 -32 44 16 46 43 16 16 44 56 36 42 37 26 - 6 0 0 44 7 1 19 52 33 5 68 -33 44 37 21 43 36 54 45 17 10 42 58 4 - 5 0 0 44 27 25 19 52 32 5 69 -33 44 57 45 43 57 19 45 37 32 43 18 32 - 4 0 0 44 47 38 19 52 31 6 70 -34 45 17 56 44 17 33 45 57 42 43 38 47 - 3 0 0 45 7 38 19 52 29 7 70 -35 45 37 55 44 37 35 46 17 39 43 58 51 - 2 0 0 45 27 26 19 52 28 8 71 -35 45 57 42 44 57 25 46 37 24 44 18 42 - 1 0 0 45 47 2 19 52 26 8 72 -36 46 17 16 45 17 1 46 56 55 44 38 21 0 0 0 46 6 24 19 52 24 9 72 -37 46 36 36 45 36 25 47 16 13 44 57 46 1 0 0 46 25 32 19 52 22 10 73 -37 46 55 43 45 55 35 47 35 18 45 16 59 2 0 0 46 44 27 19 52 20 11 74 -38 47 14 36 46 14 32 47 54 9 45 35 58 3 0 0 47 3 9 19 52 18 11 75 -39 47 33 15 46 33 15 48 12 45 45 54 43 4 0 0 47 21 36 19 52 16 12 75 -39 47 51 41 46 51 44 48 31 8 46 13 15 5 0 0 47 39 48 19 52 14 13 76 -40 48 9 51 47 9 59 48 49 16 46 31 32 6 0 0 47 57 47 19 52 11 14 77 -41 48 27 48 47 28 0 49 7 9 46 49 35 7 0 0 48 15 30 19 52 8 14 78 -41 48 45 29 47 45 45 49 24 48 47 7 24 8 0 0 48 32 59 19 52 6 15 78 -42 49 2 56 48 3 16 49 42 11 47 24 58 9 0 0 48 50 13 19 52 3 16 79 -42 49 20 7 48 20 33 49 59 20 47 42 17 10 0 0 49 7 12 19 52 0 16 80 -43 49 37 3 48 37 34 50 16 13 47 59 21 11 0 0 49 23 55 19 51 57 17 81 -43 49 53 44 48 54 20 50 32 51 48 16 10 12 0 0 49 40 24 19 51 54 18 82 -44 50 10 10 49 10 50 50 49 13 48 32 44 13 0 0 49 56 36 19 51 50 18 82 -44 50 26 20 49 27 5 51 5 20 48 49 2 14 0 0 50 12 33 19 51 47 19 83 -45 50 42 15 49 43 5 51 21 11 49 5 5 15 0 0 50 28 15 19 51 44 20 84 -45 50 57 53 49 58 49 51 36 46 49 20 52 16 0 0 50 43 41 19 51 40 20 85 -46 51 13 17 50 14 17 51 52 5 49 36 24 17 0 0 50 58 50 19 51 37 21 86 -46 51 28 24 50 29 30 52 7 9 49 51 40 18 0 0 51 13 45 19 51 33 22 87 -47 51 43 15 50 44 27 52 21 57 50 6 40 19 0 0 51 28 23 19 51 29 22 87 -47 51 57 51 50 59 8 52 36 28 50 21 25 20 0 0 51 42 45 19 51 25 23 88 -48 52 12 10 51 13 33 52 50 44 50 35 53 21 0 0 51 56 52 19 51 22 23 89 -48 52 26 14 51 27 42 53 4 44 50 50 6 22 0 0 52 10 42 19 51 18 24 90 -49 52 40 1 51 41 35 53 18 28 51 4 3 23 0 0 52 24 16 19 51 14 25 91 -49 52 53 33 51 55 13 53 31 55 51 17 44 24 0 0 52 37 35 19 51 10 25 92 -49 53 6 48 52 8 34 53 45 7 51 31 9 25 0 0 52 50 37 19 51 5 26 93 -50 53 19 48 52 21 39 53 58 3 51 44 17 26 0 0 53 3 24 19 51 1 26 94 -50 53 32 32 52 34 29 54 10 43 51 57 10 27 0 0 53 15 55 19 50 57 27 95 -50 53 44 59 52 47 2 54 23 7 52 9 47 28 0 0 53 28 9 19 50 53 28 95 -51 53 57 11 52 59 19 54 35 15 52 22 8 29 0 0 53 40 8 19 50 48 28 96 -51 54 9 7 53 11 21 54 47 7 52 34 14 30 0 0 53 51 51 19 50 44 29 97 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44 39 43 158 0 0 45 29 11 19 37 49 35 261 -13 45 59 25 44 59 11 46 39 5 44 20 31 159 0 0 45 9 50 19 37 42 35 262 -12 45 40 5 44 39 49 46 19 46 44 1 7 160 0 0 44 50 17 19 37 36 34 263 -11 45 20 33 44 20 14 46 0 15 43 41 31 161 0 0 44 30 32 19 37 29 34 264 -11 45 0 50 44 0 29 45 40 33 43 21 45 162 0 0 44 10 37 19 37 23 33 265 -10 44 40 55 43 40 33 45 20 40 43 1 47 163 0 0 43 50 31 19 37 17 32 266 -9 44 20 50 43 20 26 45 0 36 42 41 40 164 0 0 43 30 14 19 37 10 32 267 -8 44 0 34 43 0 9 44 40 21 42 21 22 165 0 0 43 9 48 19 37 4 31 267 -7 43 40 8 42 39 42 44 19 55 42 0 54 166 0 0 42 49 12 19 36 58 30 268 -7 43 19 32 42 19 5 43 59 20 41 40 17 167 0 0 42 28 26 19 36 52 29 269 -6 42 58 47 41 58 19 43 38 36 41 19 30 168 0 0 42 7 32 19 36 46 29 270 -5 42 37 53 41 37 25 43 17 42 40 58 35 169 0 0 41 46 29 19 36 40 28 271 -4 42 16 50 41 16 22 42 56 39 40 37 32 170 0 0 41 25 18 19 36 35 27 272 -3 41 55 39 40 55 11 42 35 29 40 16 21 171 0 0 41 4 0 19 36 29 26 272 -3 41 34 21 40 33 52 42 14 10 39 55 3 172 0 0 40 42 34 19 36 24 26 273 -2 41 12 55 40 12 27 41 52 44 39 33 37 173 0 0 40 21 1 19 36 18 25 274 -1 40 51 22 39 50 54 41 31 10 39 12 6 174 0 0 39 59 22 19 36 13 24 275 0 40 29 43 39 29 16 41 9 31 38 50 28 Uncertainty in time = +/- 7 secs Prediction of 2012 Dec 3.0 Data for the target star ------------------------ * name: TYC 1355-01006-1 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 07 24 35.4503 DE: +18 47 40.385 * position source: mpos:UCAC4 pm:UCAC4 * standard error: RA,DE ["]: ( .027, .024 ) * V mag [mag]: 11.2 * B mag [mag]: 12.1 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1004) Belopolskya approx. diameter [km]: 80 approx. diameter ["]: .044 distance from Earth [AU]: 2.52100 * orbital information: orbit source: Preston date of fit: 2012 Nov 29 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 1398 number of rejected observations: 81 time covered by the observations: 1923 Sep 13 - 2012 Nov 25 1 sigma uncertainty ellipse (major, minor, PA): 0.023, 0.016, 96° remarks: * orbital elements for (1004) Belopolskya : Mean anomaly = 80.27710391 deg Arg. of pericenter = 216.78981080 deg Long. of node = 153.57201615 deg Inclination = 2.97590621 deg Eccentricity = 0.08674152 Semimajor axis = 3.40597399 AU Perihelion dist = 3.11053462 AU Mag: H = 9.74, G = 0.15 Epoch of elements : MJD 56268.82200000 TDT (2012 Dec 07.822) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 7 1004 Belopolskya 19h 43.8m UT 11.2 7 24 35.450 18 47 40.39TYC 1355-01006-1 12.1 15.3 80 8.5 2.521 -1.300 2.17 98.2223 18.795 -118.00 -22.71 19.7297 0.06989 0.61409 -5.28880 0.62045 -0.00335 0.00077 2000 78.89382720121129.00000216.789811153.572016 2.9759060.08674152 3.4059740 3.110534610.0 5.00.15 RATE 1.5679860 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.035 0.029 93 1.65 0.029 0 0 3-5 056264.0020121207_1006-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 29, 22:53 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org