IOTA/IOTA-ES occultation update for (302) Clarissa / TYC 6907-00771-1 event on 2009 Oct 02, 01:33 UT Visible from Summary ------- On 2009 Oct 02 UT, the 39 km diameter asteroid (302) Clarissa will occult a 11.6 mag star in the constellation Capricornus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 3.6 mag to 15.2 mag (the magnitude of the asteroid) for at most 6.8 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: 51 * date and approx. time of event: 2009 Oct 02, 01:31 - 2009 Oct 02, 01:46 UT * magnitude of target star: 11.6 * magnitude drop [mag]: 3.6 * estimated maximum duration [s]: 6.8 * Moon: 95 % sunlit, 41° distance * Sun: 114° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 53 * 1 sigma uncertainty interval [path widths]: +/- 1.25 * 1 sigma uncertainty interval [seconds]: +/- 7.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .035 +/- .037) * 1 sigma uncertainty ellipse (major, minor, PA): ( .037", .035", 357° ) * approx speed of asteroid's shadow [km/s]: 5.6323 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6907-00771-1 by 302 Clarissa on 2009 Oct 2 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 - 59 44 12 63 0 0 1 46 39 1 209 -27 - 59 8 30 - 60 19 53 ... .. .. - 61 49 0 - 60 59 14 62 0 0 1 46 38 2 208 -27 - 60 24 47 - 61 33 41 ... .. .. - 62 59 46 - 62 11 38 61 0 0 1 46 37 3 207 -27 - 61 38 19 - 62 44 57 ... .. .. - 64 8 16 - 63 21 43 60 0 0 1 46 35 4 206 -28 - 62 49 25 - 63 54 0 - 61 28 42 - 65 14 46 - 64 29 43 59 0 0 1 46 32 6 205 -28 - 63 58 23 - 65 1 4 - 62 40 5 - 66 19 28 - 65 35 53 58 0 0 1 46 29 7 204 -29 - 65 5 27 - 66 6 21 - 63 49 22 - 67 22 36 - 66 40 26 57 0 0 1 46 25 8 203 -29 - 66 10 48 - 67 10 5 - 64 56 46 - 68 24 19 - 67 43 31 56 0 0 1 46 20 9 202 -29 - 67 14 38 - 68 12 25 - 66 2 30 - 69 24 47 - 68 45 18 55 0 0 1 46 15 10 202 -30 - 68 17 7 - 69 13 30 - 67 6 45 - 70 24 10 - 69 45 56 54 0 0 1 46 10 11 201 -30 - 69 18 23 - 70 13 30 - 68 9 39 - 71 22 33 - 70 45 32 53 0 0 1 46 3 12 200 -30 - 70 18 36 - 71 12 31 - 69 11 23 - 72 20 5 - 71 44 15 52 0 0 1 45 56 14 199 -30 - 71 17 52 - 72 10 40 - 70 12 3 - 73 16 52 - 72 42 9 51 0 0 1 45 48 15 198 -30 - 72 16 18 - 73 8 3 - 71 11 47 - 74 12 59 - 73 39 22 50 0 0 1 45 40 16 197 -30 - 73 13 59 - 74 4 48 - 72 10 41 - 75 8 32 - 74 35 59 49 0 0 1 45 31 17 196 -30 - 74 11 3 - 75 0 58 - 73 8 52 - 76 3 36 - 75 32 5 48 0 0 1 45 21 18 196 -30 - 75 7 33 - 75 56 39 - 74 6 25 - 76 58 16 - 76 27 44 47 0 0 1 45 11 19 195 -30 - 76 3 36 - 76 51 55 - 75 3 25 - 77 52 36 - 77 23 2 46 0 0 1 45 0 20 194 -30 - 76 59 15 - 77 46 52 - 75 59 58 - 78 46 40 - 78 18 3 45 0 0 1 44 49 22 193 -30 - 77 54 35 - 78 41 33 - 76 56 8 - 79 40 33 - 79 12 50 44 0 0 1 44 36 23 192 -30 - 78 49 41 - 79 36 3 - 77 51 59 - 80 34 19 - 80 7 29 43 0 0 1 44 23 24 191 -30 - 79 44 36 - 80 30 25 - 78 47 36 - 81 28 0 - 81 2 2 42 0 0 1 44 10 25 190 -30 - 80 39 25 - 81 24 44 - 79 43 3 - 82 21 42 - 81 56 35 41 0 0 1 43 56 26 189 -29 - 81 34 11 - 82 19 2 - 80 38 24 - 83 15 27 - 82 51 10 40 0 0 1 43 41 27 189 -29 - 82 28 58 - 83 13 25 - 81 33 43 - 84 9 19 - 83 45 51 39 0 0 1 43 25 28 188 -29 - 83 23 50 - 84 7 55 - 82 29 4 - 85 3 23 - 84 40 42 38 0 0 1 43 9 29 187 -28 - 84 18 51 - 85 2 37 - 83 24 30 - 85 57 40 - 85 35 47 37 0 0 1 42 52 30 186 -28 - 85 14 5 - 85 57 33 - 84 20 6 - 86 52 17 - 86 31 10 36 0 0 1 42 34 31 185 -28 - 86 9 35 - 86 52 49 - 85 15 55 - 87 47 15 - 87 26 54 35 0 0 1 42 16 33 184 -27 - 87 5 25 - 87 48 28 - 86 12 1 - 88 42 40 - 88 23 4 34 0 0 1 41 57 34 183 -26 - 88 1 40 - 88 44 33 - 87 8 28 - 89 38 34 - 89 19 44 33 0 0 1 41 37 35 181 -26 - 88 58 24 - 89 41 10 - 88 5 21 - 90 35 3 - 90 16 58 32 0 0 1 41 16 36 180 -25 - 89 55 40 - 90 38 22 - 89 2 44 - 91 32 11 - 91 14 51 31 0 0 1 40 55 37 179 -25 - 90 53 34 - 91 36 14 - 90 0 41 - 92 30 2 - 92 13 27 30 0 0 1 40 33 38 178 -24 - 91 52 9 - 92 34 50 - 90 59 16 - 93 28 42 - 93 12 52 29 0 0 1 40 10 39 176 -23 - 92 51 32 - 93 34 17 - 91 58 36 - 94 28 16 - 94 13 11 28 0 0 1 39 47 39 175 -22 - 93 51 48 - 94 34 40 - 92 58 44 - 95 28 48 - 95 14 30 27 0 0 1 39 23 40 174 -21 - 94 53 1 - 95 36 4 - 93 59 47 - 96 30 27 - 96 16 55 26 0 0 1 38 57 41 172 -21 - 95 55 20 - 96 38 36 - 95 1 50 - 97 33 18 - 97 20 33 25 0 0 1 38 32 42 171 -20 - 96 58 50 - 97 42 23 - 96 5 1 - 98 37 29 - 98 25 32 24 0 0 1 38 5 43 169 -19 - 98 3 38 - 98 47 32 - 97 9 25 - 99 43 7 - 99 32 0 23 0 0 1 37 37 44 167 -18 - 99 9 54 - 99 54 14 - 98 15 12 -100 50 23 -100 40 7 22 0 0 1 37 9 44 165 -16 -100 17 46 -101 2 36 - 99 22 29 -101 59 26 -101 50 2 21 0 0 1 36 39 45 164 -15 -101 27 24 -102 12 49 -100 31 26 -103 10 28 -103 1 59 20 0 0 1 36 9 45 162 -14 -102 39 0 -103 25 7 -101 42 15 -104 23 42 -104 16 10 19 0 0 1 35 37 46 160 -13 -103 52 48 -104 39 43 -102 55 6 -105 39 23 -105 32 51 18 0 0 1 35 5 46 157 -11 -105 9 1 -105 56 52 -104 10 15 -106 57 48 -106 52 20 17 0 0 1 34 31 47 155 -10 -106 27 59 -107 16 55 -105 27 57 -108 19 20 -108 14 59 16 0 0 1 33 57 47 153 -9 -107 50 0 -108 40 13 -106 48 32 -109 44 21 -109 41 14 15 0 0 1 33 21 47 151 -7 -109 15 31 -110 7 12 -108 12 21 -111 13 22 -111 11 35 14 0 0 1 32 43 47 148 -5 -110 45 1 -111 38 27 -109 39 50 -112 47 1 -112 46 41 13 0 0 1 32 4 47 146 -4 -112 19 6 -113 14 37 -111 11 34 -114 26 4 -114 27 21 12 0 0 1 31 24 47 143 -2 -113 58 33 -114 56 34 -112 48 11 -116 11 31 Uncertainty in time = +/- 9 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 6907-00771-1 * constellation : Capricornus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 20 22 23.7058 DE: -22 34 36.030 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .026, .033 ) * V mag [mag]: 11.6 * B mag [mag]: 12.5 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (302) Clarissa approx. diameter [km]: 39 approx. diameter ["]: .029 distance from Earth [AU]: 1.82700 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 936 number of rejected observations: 59 time covered by the observations: 1905 Oct 25 - 2008 Feb 11 1 sigma uncertainty ellipse (major, minor, PA): 0.023, 0.016, 75° remarks: * orbital elements for (302) Clarissa : Mean anomaly = 275.58549690 deg Arg. of pericenter = 54.14605224 deg Long. of node = 7.91211783 deg Inclination = 3.41284523 deg Eccentricity = 0.11130713 Semimajor axis = 2.40701007 AU Perihelion dist = 2.13909269 AU Mag: H = 11.01, G = 0.15 Epoch of elements : MJD 55106.06500000 TDT (2009 Oct 02.065) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Oct 2 302 Clarissa 1h 32.8m UT 11.6 20 22 23.706-22 34 36.03TYC 6907-00771-1 12.5 15.2 39 6.8 1.827 0.927 8.35 -88.5236 -22.578 154.15 -3.57 1.5474 -0.37140 0.56843 2.66449 1.73401 0.00493 0.00129 2000 273.9847672009 926.00000 54.146052 7.912118 3.4128450.11130713 2.4070101 2.139092710.9 5.00.15 RATE 2.6392910 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.037 0.035 357 2.25 0.037 0 54545.5020091002_0771-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 14:17 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org