IOTA/IOTA-ES occultation update for (1214) Richilde / TYC 6115-01129-1 event on 2009 Feb 04, 20:43 UT Visible from Summary ------- On 2009 Feb 04 UT, the 35 km diameter asteroid (1214) Richilde will occult a 11.2 mag star in the constellation Virgo for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.8 mag to 16.0 mag (the magnitude of the asteroid) for at most 5.3 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: 33 * date and approx. time of event: 2009 Feb 04, 20:31 - 2009 Feb 04, 20:43 UT * magnitude of target star: 11.2 * magnitude drop [mag]: 4.8 * estimated maximum duration [s]: 5.3 * Moon: 71 % sunlit, 131° distance * Sun: 114° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 42 * 1 sigma uncertainty interval [path widths]: +/- 2.05 * 1 sigma uncertainty interval [seconds]: +/- 9.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .043 +/- .035) * 1 sigma uncertainty ellipse (major, minor, PA): ( .043", .035", 105° ) * approx speed of asteroid's shadow [km/s]: 6.6532 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6115-01129-1 by 1214 Richilde on 2009 Feb 4 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 157 32 49 62 0 0 20 31 14 1 222 -9 157 1 16 158 4 43 ... .. .. 160 19 33 155 47 47 61 0 0 20 31 15 3 220 -9 155 18 17 156 17 34 ... .. .. 158 23 0 154 13 57 60 0 0 20 31 16 4 219 -10 153 46 10 154 41 58 151 54 40 156 39 35 152 49 34 59 0 0 20 31 18 5 218 -10 152 23 16 153 16 4 150 37 30 155 7 3 151 33 15 58 0 0 20 31 20 6 217 -10 151 8 15 151 58 27 149 27 29 153 43 42 150 23 56 57 0 0 20 31 23 7 216 -11 150 0 3 150 47 58 148 23 43 152 28 14 149 20 43 56 0 0 20 31 26 9 215 -11 148 57 50 149 43 43 147 25 26 151 19 36 148 22 52 55 0 0 20 31 30 10 214 -11 148 0 53 148 44 58 146 32 2 150 16 56 147 29 48 54 0 0 20 31 34 11 214 -12 147 8 38 147 51 4 145 42 57 149 19 32 146 40 59 53 0 0 20 31 38 12 213 -12 146 20 33 147 1 31 144 57 46 148 26 49 145 56 0 52 0 0 20 31 43 13 212 -12 145 36 14 146 15 52 144 16 6 147 38 18 145 14 29 51 0 0 20 31 48 14 212 -12 144 55 19 145 33 43 143 37 36 146 53 33 144 36 5 50 0 0 20 31 53 15 211 -13 144 17 29 144 54 46 143 2 0 146 12 12 144 0 34 49 0 0 20 31 59 16 211 -13 143 42 29 144 18 44 142 29 2 145 33 58 143 27 39 48 0 0 20 32 5 17 211 -13 143 10 2 143 45 20 141 58 29 144 58 33 142 57 9 47 0 0 20 32 12 18 210 -13 142 39 58 143 14 23 141 30 11 144 25 44 142 28 51 46 0 0 20 32 18 19 210 -13 142 12 5 142 45 41 141 3 56 143 55 18 142 2 37 45 0 0 20 32 25 20 210 -14 141 46 13 142 19 3 140 39 35 143 27 4 141 38 16 44 0 0 20 32 33 21 210 -14 141 22 14 141 54 21 140 17 0 143 0 52 141 15 41 43 0 0 20 32 40 22 210 -14 140 59 58 141 31 26 139 56 5 142 36 33 140 54 45 42 0 0 20 32 48 23 210 -14 140 39 21 141 10 11 139 36 42 142 14 0 140 35 21 41 0 0 20 32 57 24 210 -14 140 20 14 140 50 30 139 18 45 141 53 6 140 17 24 40 0 0 20 33 5 25 210 -14 140 2 34 140 32 17 139 2 9 141 33 44 140 0 48 39 0 0 20 33 14 26 210 -14 139 46 13 140 15 26 138 46 50 141 15 49 139 45 30 38 0 0 20 33 23 27 210 -14 139 31 9 139 59 53 138 32 44 140 59 16 139 31 24 37 0 0 20 33 33 28 210 -14 139 17 16 139 45 33 138 19 45 140 44 0 139 18 26 36 0 0 20 33 42 29 210 -14 139 4 32 139 32 23 138 7 51 140 29 57 139 6 34 35 0 0 20 33 52 30 210 -14 138 52 51 139 20 19 137 56 59 140 17 4 138 55 44 34 0 0 20 34 2 31 210 -14 138 42 13 139 9 18 137 47 5 140 5 16 138 45 54 33 0 0 20 34 13 32 210 -14 138 32 33 138 59 17 137 38 8 139 54 31 138 37 0 32 0 0 20 34 24 33 210 -14 138 23 49 138 50 13 137 30 3 139 44 46 138 29 1 31 0 0 20 34 35 34 211 -13 138 15 58 138 42 4 137 22 51 139 35 58 138 21 53 30 0 0 20 34 46 34 211 -13 138 9 0 138 34 48 137 16 27 139 28 6 138 15 36 29 0 0 20 34 57 35 211 -13 138 2 51 138 28 23 137 10 52 139 21 7 138 10 8 28 0 0 20 35 9 36 212 -13 137 57 30 138 22 47 137 6 2 139 14 59 138 5 27 27 0 0 20 35 21 37 212 -13 137 52 56 138 17 59 137 1 57 139 9 40 138 1 31 26 0 0 20 35 33 38 212 -13 137 49 7 138 13 56 136 58 35 139 5 10 137 58 19 25 0 0 20 35 46 39 213 -12 137 46 2 138 10 38 136 55 55 139 1 26 137 55 51 24 0 0 20 35 59 40 213 -12 137 43 39 138 8 4 136 53 56 138 58 27 137 54 4 23 0 0 20 36 11 40 214 -12 137 41 58 138 6 12 136 52 37 138 56 13 137 53 0 22 0 0 20 36 25 41 214 -12 137 40 58 138 5 2 136 51 58 138 54 42 137 52 35 21 0 0 20 36 38 42 215 -11 137 40 39 138 4 33 136 51 57 138 53 53 137 52 50 20 0 0 20 36 51 43 215 -11 137 40 58 138 4 44 136 52 34 138 53 47 137 53 45 19 0 0 20 37 5 44 216 -11 137 41 57 138 5 35 136 53 48 138 54 21 137 55 18 18 0 0 20 37 19 44 217 -11 137 43 34 138 7 5 136 55 40 138 55 36 137 57 30 17 0 0 20 37 33 45 217 -10 137 45 49 138 9 13 136 58 8 138 57 32 138 0 20 16 0 0 20 37 48 46 218 -10 137 48 42 138 12 0 137 1 12 139 0 7 138 3 48 15 0 0 20 38 2 46 219 -10 137 52 12 138 15 26 137 4 53 139 3 22 138 7 54 14 0 0 20 38 17 47 220 -9 137 56 20 138 19 29 137 9 10 139 7 16 138 12 38 13 0 0 20 38 32 48 220 -9 138 1 6 138 24 11 137 14 4 139 11 50 138 17 59 12 0 0 20 38 47 48 221 -8 138 6 29 138 29 31 137 19 33 139 17 4 138 23 58 11 0 0 20 39 3 49 222 -8 138 12 29 138 35 29 137 25 39 139 22 57 138 30 36 10 0 0 20 39 18 50 223 -8 138 19 8 138 42 6 137 32 21 139 29 30 138 37 52 9 0 0 20 39 34 50 224 -7 138 26 25 138 49 21 137 39 41 139 36 43 138 45 47 8 0 0 20 39 49 51 225 -7 138 34 20 138 57 16 137 47 38 139 44 37 138 54 22 7 0 0 20 40 5 51 226 -6 138 42 55 139 5 51 137 56 12 139 53 11 139 3 36 6 0 0 20 40 22 52 228 -6 138 52 9 139 15 6 138 5 25 140 2 28 139 13 31 5 0 0 20 40 38 52 229 -5 139 2 3 139 25 1 138 15 17 140 12 27 139 24 8 4 0 0 20 40 54 53 230 -5 139 12 39 139 35 39 138 25 49 140 23 8 139 35 26 3 0 0 20 41 11 53 231 -4 139 23 56 139 46 59 138 37 0 140 34 34 139 47 28 2 0 0 20 41 28 54 232 -4 139 35 56 139 59 2 138 48 54 140 46 44 140 0 13 1 0 0 20 41 45 54 234 -3 139 48 39 140 11 49 139 1 29 140 59 41 140 13 44 0 0 0 20 42 2 54 235 -3 140 2 8 140 25 23 139 14 48 141 13 24 140 28 2 - 1 0 0 20 42 19 55 237 -2 140 16 22 140 39 43 139 28 52 141 27 56 140 43 7 - 2 0 0 20 42 36 55 238 -1 140 31 24 140 54 51 139 43 42 141 43 17 140 59 1 - 3 0 0 20 42 54 55 239 -1 140 47 15 141 10 49 139 59 18 141 59 30 141 15 46 - 4 0 0 20 43 11 55 241 0 141 3 56 141 27 38 140 15 44 142 16 36 Uncertainty in time = +/- 11 secs [Prediction of 2008 Nov 6.0] Data for the target star ------------------------ * name: TYC 6115-01129-1 * constellation : Virgo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 13 01 26.9072 DE: -19 21 21.367 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .024, .027 ) * V mag [mag]: 11.2 * B mag [mag]: 11.5 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1214) Richilde approx. diameter [km]: 35 approx. diameter ["]: .020 distance from Earth [AU]: 2.38000 * orbital information: orbit source: Preston date of fit: 2008 Nov 05 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 797 number of rejected observations: 56 time covered by the observations: 1930 Sep 20 - 2008 May 08 1 sigma uncertainty ellipse (major, minor, PA): 0.036, 0.022, 111° remarks: * orbital elements for (1214) Richilde : Mean anomaly = 233.91128158 deg Arg. of pericenter = 33.60850783 deg Long. of node = 286.08871430 deg Inclination = 9.82978718 deg Eccentricity = 0.11724292 Semimajor axis = 2.71117340 AU Perihelion dist = 2.39330753 AU Mag: H = 11.08, G = 0.15 Epoch of elements : MJD 54866.86400000 TDT (2009 Feb 04.864) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Feb 4 1214 Richilde 20h 44.4m UT 11.2 13 1 26.907-19 21 21.37TYC 6115-01129-1 11.5 16.0 35 5.3 2.380 0.250 -13.41 109.1195 -19.352 -127.60 -15.99 20.7399 0.54375 0.14346 0.96040 -3.63035 -0.00477 0.00258 2000 232.3958192009 129.00000 33.608508286.088714 9.8297870.11724292 2.7111734 2.393307510.9 5.00.15 RATE 2.2078420 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.043 0.035 105 3.05 0.042 0 54776.5020090204_1129-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 06, 05:05 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org