IOTA/IOTA-ES occultation update for (804) Hispania / TYC 6921-00430-1 event on 2012 Nov 08, 01:53 UT Visible from W Canada, W USA Summary ------- On 2012 Nov 08 UT, the 147 km diameter asteroid (804) Hispania will occult a 12.5 mag star in the constellation Capricornus for observers along a path across W Canada, W USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.9 mag to 12.8 mag (the magnitude of the asteroid) for at most 6.0 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: 84 * date and approx. time of event: 2012 Nov 08, 01:55 - 2012 Nov 08, 01:56 UT * geocentric midpoint of event [JD]: 2456239.57904583 * magnitude of target star: 12.5 * magnitude drop [mag]: 0.9 * estimated maximum duration [s]: 6.0 * Moon: 38 % sunlit, 155° distance * Sun: 81° distance * rough path description: W Canada, W USA The occultation path -------------------- * approximate projected width [km]: 205 * 1 sigma uncertainty interval [path widths]: +/- 0.61 * 1 sigma uncertainty interval [seconds]: +/- 4.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .073 +/- .044) * 1 sigma uncertainty ellipse (major, minor, PA): ( .073", .043", 88° ) * approx speed of asteroid's shadow [km/s]: 24.5178 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6921-00430-1 by 804 Hispania on 2012 Nov 8 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 ' " Longitude Longitude Longitude Longitude - 94 54 42 62 0 0 1 56 54 1 209 -28 - 92 39 54 - 97 9 35 ... .. .. - 99 54 35 - 96 6 40 61 0 0 1 56 54 2 208 -28 - 93 56 7 - 98 17 23 ... .. .. -100 57 25 - 97 16 36 60 0 0 1 56 54 3 207 -27 - 95 9 58 - 99 23 31 ... .. .. -101 58 58 - 98 24 46 59 0 0 1 56 53 5 206 -27 - 96 21 44 -100 28 10 ... .. .. -102 59 25 - 99 31 23 58 0 0 1 56 53 6 205 -27 - 97 31 38 -101 31 31 ... .. .. -103 58 53 -100 36 37 57 0 0 1 56 52 7 204 -26 - 98 39 55 -102 33 46 - 96 17 59 -104 57 33 -101 40 38 56 0 0 1 56 51 8 203 -26 - 99 46 46 -103 35 2 - 97 28 21 -105 55 30 -102 43 37 55 0 0 1 56 50 9 202 -25 -100 52 21 -104 35 27 - 98 37 11 -106 52 51 -103 45 41 54 0 0 1 56 49 10 201 -25 -101 56 50 -105 35 9 - 99 44 39 -107 49 43 -104 46 58 53 0 0 1 56 47 12 200 -24 -103 0 20 -106 34 15 -100 50 57 -108 46 10 -105 47 34 52 0 0 1 56 46 13 200 -24 -104 3 0 -107 32 49 -101 56 11 -109 42 19 -106 47 36 51 0 0 1 56 44 14 199 -23 -105 4 57 -108 30 59 -103 0 31 -110 38 13 -107 47 10 50 0 0 1 56 42 15 198 -23 -106 6 16 -109 28 48 -104 4 2 -111 33 58 -108 46 20 49 0 0 1 56 40 16 197 -22 -107 7 5 -110 26 22 -105 6 53 -112 29 38 -109 45 13 48 0 0 1 56 38 17 196 -21 -108 7 28 -111 23 46 -106 9 10 -113 25 16 -110 43 53 47 0 0 1 56 36 18 195 -20 -109 7 31 -112 21 4 -107 10 57 -114 20 56 -111 42 24 46 0 0 1 56 33 20 194 -20 -110 7 19 -113 18 21 -108 12 21 -115 16 44 -112 40 51 45 0 0 1 56 30 21 194 -19 -111 6 56 -114 15 39 -109 13 26 -116 12 41 -113 39 18 44 0 0 1 56 28 22 193 -18 -112 6 27 -115 13 4 -110 14 18 -117 8 52 -114 37 49 43 0 0 1 56 25 23 192 -17 -113 5 57 -116 10 39 -111 15 1 -118 5 21 -115 36 29 42 0 0 1 56 22 24 191 -17 -114 5 29 -117 8 29 -112 15 40 -119 2 12 -116 35 22 41 0 0 1 56 18 25 190 -16 -115 5 9 -118 6 36 -113 16 20 -119 59 27 -117 34 30 40 0 0 1 56 15 26 189 -15 -116 4 59 -119 5 5 -114 17 4 -120 57 11 -118 34 0 39 0 0 1 56 11 27 188 -14 -117 5 5 -120 4 0 -115 17 56 -121 55 28 -119 33 53 38 0 0 1 56 8 28 187 -13 -118 5 29 -121 3 25 -116 19 2 -122 54 21 -120 34 16 37 0 0 1 56 4 30 186 -12 -119 6 18 -122 3 24 -117 20 25 -123 53 55 -121 35 11 36 0 0 1 55 59 31 185 -11 -120 7 34 -123 4 2 -118 22 10 -124 54 15 -122 36 44 35 0 0 1 55 55 32 184 -10 -121 9 22 -124 5 22 -119 24 20 -125 55 24 -123 38 58 34 0 0 1 55 51 33 183 -9 -122 11 47 -125 7 30 -120 27 1 -126 57 27 -124 42 0 33 0 0 1 55 46 34 182 -8 -123 14 53 -126 10 30 -121 30 17 -128 0 31 -125 45 53 32 0 0 1 55 41 35 181 -6 -124 18 45 -127 14 27 -122 34 13 -129 4 40 -126 50 43 31 0 0 1 55 36 36 179 -5 -125 23 28 -128 19 28 -123 38 54 -130 10 0 -127 56 36 30 0 0 1 55 31 37 178 -4 -126 29 9 -129 25 38 -124 44 24 -131 16 38 -129 3 38 29 0 0 1 55 26 38 177 -3 -127 35 52 -130 33 4 -125 50 50 -132 24 41 -130 11 56 28 0 0 1 55 20 39 175 -1 -128 43 44 -131 41 53 -126 58 17 -133 34 16 -131 21 37 27 0 0 1 55 14 40 174 0 -129 52 52 -132 52 13 -128 6 53 -134 45 34 Uncertainty in time = +/- 5 secs Prediction of 2012 Oct 8.0 Data for the target star ------------------------ * name: TYC 6921-00430-1 * constellation : Capricornus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 20 40 28.9158 DE: -23 21 56.445 * position source: mpos:UCAC4 pm:UCAC4 * standard error: RA,DE ["]: ( .071, .043 ) * V mag [mag]: 12.5 * B mag [mag]: 12.6 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (804) Hispania approx. diameter [km]: 147 approx. diameter ["]: .084 distance from Earth [AU]: 2.40400 * orbital information: orbit source: Preston date of fit: 2012 Oct 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 968 number of rejected observations: 79 time covered by the observations: 1907 Sep 24 - 2012 Sep 29 1 sigma uncertainty ellipse (major, minor, PA): 0.018, 0.009, 61° remarks: * orbital elements for (804) Hispania : Mean anomaly = 359.07862256 deg Arg. of pericenter = 342.92864318 deg Long. of node = 347.74640506 deg Inclination = 15.36312070 deg Eccentricity = 0.13837412 Semimajor axis = 2.83858325 AU Perihelion dist = 2.44579678 AU Mag: H = 7.79, G = 0.18 Epoch of elements : MJD 56239.07900000 TDT (2012 Nov 08.079) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 8 804 Hispania 1h 53.8m UT 12.5 20 40 28.916-23 21 56.45TYC 6921-00430-1 12.6 12.8 147 6.0 2.404 3.138 26.38 -125.9996 -23.372 147.48 -16.65 1.8971 -0.35890 0.59607 11.81099 7.21150 0.00549 0.00139 2000 357.20755520121030.00000342.928643347.746405 15.3631210.13837412 2.8385833 2.4457968 7.8 5.00.18 RATE 2.0608750 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.073 0.043 88 1.61 0.051 0 0-2 5 056208.0020121108_0430-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 07, 20:17 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org