IOTA/IOTA-ES occultation update for (2089) Cetacea / TYC 0350-00781-1 event on 2008 May 08, 15:03 UT Visible from E Russia Summary ------- On 2008 May 08 UT, the 21 km diameter asteroid (2089) Cetacea will occult a 10.0 mag star in the constellation Serpens for observers along a path across E Russia. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.2 mag to 15.2 mag (the magnitude of the asteroid) for at most 1.5 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: 19 * date and approx. time of event: 2008 May 08, 14:59 - 2008 May 08, 15:08 UT * magnitude of target star: 10.0 * magnitude drop [mag]: 5.2 * estimated maximum duration [s]: 1.5 * Moon: 15 % sunlit, 132° distance * Sun: 161° distance * rough path description: E Russia The occultation path -------------------- * approximate projected width [km]: 31 * 1 sigma uncertainty interval [path widths]: +/- 3.47 * 1 sigma uncertainty interval [seconds]: +/- 7.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .070 +/- .053) * 1 sigma uncertainty ellipse (major, minor, PA): ( .072", .051", 107° ) * approx speed of asteroid's shadow [km/s]: 13.6997 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0350-00781-1 by 2089 Cetacea on 2008 May 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 ' " Latitude Latitude Latitude Latitude 67 0 0 53 48 31 15 8 51 11 105 0 53 56 58 53 40 6 54 56 15 52 42 13 68 0 0 53 47 10 15 8 50 12 105 -1 53 55 37 53 38 44 54 54 54 52 40 51 69 0 0 53 45 43 15 8 48 12 106 -1 53 54 10 53 37 17 54 53 28 52 39 24 70 0 0 53 44 10 15 8 46 13 107 -2 53 52 38 53 35 45 54 51 56 52 37 51 71 0 0 53 42 32 15 8 45 13 108 -2 53 50 59 53 34 6 54 50 18 52 36 12 72 0 0 53 40 48 15 8 43 14 109 -3 53 49 15 53 32 22 54 48 35 52 34 27 73 0 0 53 38 59 15 8 41 15 110 -3 53 47 26 53 30 32 54 46 46 52 32 37 74 0 0 53 37 3 15 8 40 15 110 -4 53 45 31 53 28 37 54 44 52 52 30 41 75 0 0 53 35 3 15 8 38 16 111 -4 53 43 30 53 26 36 54 42 52 52 28 39 76 0 0 53 32 56 15 8 36 16 112 -5 53 41 24 53 24 30 54 40 46 52 26 32 77 0 0 53 30 44 15 8 34 17 113 -5 53 39 12 53 22 18 54 38 35 52 24 20 78 0 0 53 28 27 15 8 32 17 114 -6 53 36 55 53 20 0 54 36 18 52 22 2 79 0 0 53 26 4 15 8 29 18 115 -6 53 34 32 53 17 37 54 33 56 52 19 38 80 0 0 53 23 36 15 8 27 19 116 -7 53 32 4 53 15 9 54 31 29 52 17 9 81 0 0 53 21 2 15 8 25 19 116 -7 53 29 30 53 12 35 54 28 56 52 14 34 82 0 0 53 18 23 15 8 22 20 117 -7 53 26 51 53 9 56 54 26 18 52 11 55 83 0 0 53 15 39 15 8 20 20 118 -8 53 24 7 53 7 12 54 23 34 52 9 9 84 0 0 53 12 49 15 8 18 21 119 -8 53 21 17 53 4 22 54 20 45 52 6 19 85 0 0 53 9 54 15 8 15 21 120 -9 53 18 22 53 1 27 54 17 51 52 3 23 86 0 0 53 6 54 15 8 12 22 121 -9 53 15 22 52 58 26 54 14 52 52 0 22 87 0 0 53 3 48 15 8 10 22 122 -10 53 12 17 52 55 21 54 11 47 51 57 15 88 0 0 53 0 37 15 8 7 23 123 -10 53 9 6 52 52 10 54 8 38 51 54 4 89 0 0 52 57 22 15 8 4 23 124 -11 53 5 51 52 48 54 54 5 23 51 50 47 90 0 0 52 54 1 15 8 1 24 124 -11 53 2 30 52 45 33 54 2 3 51 47 25 91 0 0 52 50 35 15 7 58 24 125 -12 52 59 4 52 42 7 53 58 38 51 43 59 92 0 0 52 47 4 15 7 55 25 126 -12 52 55 33 52 38 36 53 55 8 51 40 27 93 0 0 52 43 28 15 7 52 25 127 -12 52 51 58 52 35 0 53 51 33 51 36 50 94 0 0 52 39 47 15 7 49 26 128 -13 52 48 17 52 31 19 53 47 53 51 33 8 95 0 0 52 36 2 15 7 46 26 129 -13 52 44 31 52 27 33 53 44 8 51 29 22 96 0 0 52 32 11 15 7 42 27 130 -14 52 40 41 52 23 43 53 40 19 51 25 30 97 0 0 52 28 16 15 7 39 27 131 -14 52 36 46 52 19 47 53 36 25 51 21 34 98 0 0 52 24 16 15 7 36 28 132 -14 52 32 46 52 15 47 53 32 26 51 17 34 99 0 0 52 20 11 15 7 32 28 133 -15 52 28 41 52 11 42 53 28 22 51 13 28 100 0 0 52 16 2 15 7 29 29 134 -15 52 24 32 52 7 33 53 24 14 51 9 18 101 0 0 52 11 48 15 7 25 29 135 -16 52 20 19 52 3 19 53 20 1 51 5 3 102 0 0 52 7 30 15 7 21 30 136 -16 52 16 0 51 59 1 53 15 43 51 0 44 103 0 0 52 3 7 15 7 18 30 137 -16 52 11 38 51 54 38 53 11 21 50 56 20 104 0 0 51 58 40 15 7 14 31 138 -17 52 7 11 51 50 11 53 6 55 50 51 52 105 0 0 51 54 9 15 7 10 31 139 -17 52 2 39 51 45 39 53 2 25 50 47 20 106 0 0 51 49 33 15 7 6 32 140 -17 51 58 4 51 41 3 52 57 50 50 42 44 107 0 0 51 44 53 15 7 2 32 141 -18 51 53 24 51 36 23 52 53 11 50 38 3 108 0 0 51 40 9 15 6 58 33 142 -18 51 48 40 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137 0 0 48 58 26 15 4 42 42 176 -24 49 6 59 48 49 54 50 6 59 47 51 21 138 0 0 48 52 14 15 4 37 42 178 -24 49 0 47 48 43 42 50 0 48 47 45 9 139 0 0 48 46 1 15 4 32 42 179 -24 48 54 34 48 37 29 49 54 34 47 38 56 140 0 0 48 39 46 15 4 27 42 180 -24 48 48 19 48 31 14 49 48 20 47 32 41 141 0 0 48 33 30 15 4 21 42 182 -24 48 42 3 48 24 58 49 42 4 47 26 25 142 0 0 48 27 12 15 4 16 42 183 -24 48 35 45 48 18 41 49 35 46 47 20 8 143 0 0 48 20 54 15 4 11 42 184 -24 48 29 27 48 12 22 49 29 28 47 13 49 144 0 0 48 14 35 15 4 5 42 186 -24 48 23 8 48 6 3 49 23 8 47 7 30 145 0 0 48 8 15 15 4 0 42 187 -24 48 16 48 47 59 43 49 16 48 47 1 10 146 0 0 48 1 54 15 3 55 42 188 -24 48 10 27 47 53 22 49 10 27 46 54 49 147 0 0 47 55 32 15 3 49 42 190 -24 48 4 5 47 47 1 49 4 5 46 48 28 148 0 0 47 49 10 15 3 44 42 191 -24 47 57 43 47 40 39 48 57 43 46 42 6 149 0 0 47 42 48 15 3 38 42 192 -24 47 51 21 47 34 16 48 51 21 46 35 44 150 0 0 47 36 25 15 3 33 42 194 -24 47 44 58 47 27 54 48 44 57 46 29 22 151 0 0 47 30 2 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44 33 26 42 18 50 -166 0 0 43 20 46 14 59 55 26 243 -8 43 29 15 43 12 18 44 28 46 42 14 11 -165 0 0 43 16 11 14 59 51 26 244 -8 43 24 40 43 7 44 44 24 12 42 9 38 -164 0 0 43 11 42 14 59 48 25 245 -7 43 20 11 43 3 15 44 19 42 42 5 10 -163 0 0 43 7 19 14 59 44 24 246 -7 43 15 47 42 58 51 44 15 17 42 0 47 -162 0 0 43 3 0 14 59 40 24 247 -6 43 11 29 42 54 33 44 10 58 41 56 29 -161 0 0 42 58 47 14 59 37 23 247 -6 43 7 15 42 50 19 44 6 43 41 52 16 -160 0 0 42 54 39 14 59 33 23 248 -5 43 3 7 42 46 12 44 2 35 41 48 9 -159 0 0 42 50 36 14 59 30 22 249 -4 42 59 5 42 42 9 43 58 32 41 44 7 -158 0 0 42 46 39 14 59 27 21 250 -4 42 55 8 42 38 12 43 54 34 41 40 11 -157 0 0 42 42 48 14 59 24 21 251 -3 42 51 16 42 34 21 43 50 42 41 36 21 -156 0 0 42 39 3 14 59 21 20 251 -2 42 47 31 42 30 36 43 46 56 41 32 36 -155 0 0 42 35 24 14 59 18 19 252 -2 42 43 52 42 26 57 43 43 16 41 28 57 -154 0 0 42 31 50 14 59 15 19 253 -1 42 40 18 42 23 23 43 39 42 41 25 24 -153 0 0 42 28 23 14 59 12 18 254 -1 42 36 50 42 19 56 43 36 14 41 21 57 Uncertainty in time = +/- 7 secs [Prediction of 2008 Apr 23.0] Data for the target star ------------------------ * name: TYC 0350-00781-1 * constellation : Serpens * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 15 30 15.5183 DE: +00 33 50.783 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .027, .018 ) * V mag [mag]: 10.0 * B mag [mag]: 11.2 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2089) Cetacea approx. diameter [km]: 21 approx. diameter ["]: .015 distance from Earth [AU]: 1.92800 * orbital information: orbit source: Preston date of fit: 2008 Apr 22 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 634 number of rejected observations: 20 time covered by the observations: 1939 Mar 23 - 2008 Apr 08 1 sigma uncertainty ellipse (major, minor, PA): 0.067, 0.048, 110° remarks: * orbital elements for (2089) Cetacea : Mean anomaly = 205.07600347 deg Arg. of pericenter = 286.93828761 deg Long. of node = 102.80764134 deg Inclination = 15.39573290 deg Eccentricity = 0.15616969 Semimajor axis = 2.53329332 AU Perihelion dist = 2.13766968 AU Mag: H = 11.21, G = 0.15 Epoch of elements : MJD 54594.62800000 TDT (2008 May 08.628) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 8 2089 Cetacea 15h 3.9m UT 10.0 15 30 15.518 0 33 50.78TYC 0350-00781-1 11.2 15.2 21 1.5 1.928 -2.339 3.76 139.7884 0.564 -46.84 17.30 15.0642 0.07857 0.73291 -7.68833 0.82542 -0.00061 -0.00175 2000 203.9447252008 5 4.00000286.938288102.807641 15.3957330.15616969 2.5332933 2.137669711.0 5.00.15 RATE 2.4444210 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.072 0.051 107 4.47 0.052 0 54579.5020080508_0781-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 23, 04:09 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org