IOTA/IOTA-ES occultation update for (792) Metcalfia / TYC 6114-00149-1 event on 2009 May 06, 14:31 UT Visible from Summary ------- On 2009 May 06 UT, the 61 km diameter asteroid (792) Metcalfia will occult a 9.2 mag star in the constellation Corvus 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 14.0 mag (the magnitude of the asteroid) for at most 7.5 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: 84 * date and approx. time of event: 2009 May 06, 14:20 - 2009 May 06, 14:42 UT * magnitude of target star: 9.2 * magnitude drop [mag]: 4.8 * estimated maximum duration [s]: 7.5 * Moon: 93 % sunlit, 8° distance * Sun: 151° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 75 * 1 sigma uncertainty interval [path widths]: +/- 0.62 * 1 sigma uncertainty interval [seconds]: +/- 5.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .044 +/- .029) * 1 sigma uncertainty ellipse (major, minor, PA): ( .045", .027", 106° ) * approx speed of asteroid's shadow [km/s]: 8.0741 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6114-00149-1 by 792 Metcalfia on 2009 May 6 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 96 22 42 68 0 0 14 42 5 4 169 0 97 18 32 95 26 56 98 27 51 94 17 50 97 0 46 67 0 0 14 42 3 5 170 -1 97 54 21 96 7 14 99 0 54 95 0 54 97 37 49 66 0 0 14 42 2 6 170 -2 98 29 22 96 46 19 99 33 24 95 42 32 98 14 0 65 0 0 14 42 0 7 171 -3 99 3 42 97 24 22 100 5 25 96 22 54 98 49 27 64 0 0 14 41 58 8 171 -4 99 37 26 98 1 32 100 37 3 97 2 11 99 24 16 63 0 0 14 41 55 9 172 -5 100 10 41 98 37 56 101 8 21 97 40 33 99 58 34 62 0 0 14 41 52 10 172 -6 100 43 32 99 13 41 101 39 24 98 18 6 100 32 25 61 0 0 14 41 49 11 173 -7 101 16 2 99 48 52 102 10 14 98 54 57 101 5 53 60 0 0 14 41 46 12 173 -8 101 48 16 100 23 35 102 40 55 99 31 13 101 39 3 59 0 0 14 41 42 13 174 -9 102 20 16 100 57 54 103 11 29 100 6 58 102 11 57 58 0 0 14 41 38 14 174 -10 102 52 6 101 31 53 103 41 59 100 42 17 102 44 39 57 0 0 14 41 33 15 175 -11 103 23 47 102 5 35 104 12 26 101 17 14 103 17 11 56 0 0 14 41 29 16 175 -12 103 55 23 102 39 3 104 42 53 101 51 52 103 49 36 55 0 0 14 41 24 17 176 -13 104 26 56 103 12 21 105 13 20 102 26 14 104 21 56 54 0 0 14 41 18 18 176 -14 104 58 27 103 45 30 105 43 51 103 0 25 104 54 14 53 0 0 14 41 13 19 177 -15 105 29 59 104 18 33 106 14 25 103 34 25 105 26 30 52 0 0 14 41 7 20 177 -16 106 1 32 104 51 33 106 45 5 104 8 18 105 58 48 51 0 0 14 41 1 21 178 -17 106 33 9 105 24 31 107 15 52 104 42 6 106 31 8 50 0 0 14 40 54 22 178 -18 107 4 51 105 57 28 107 46 47 105 15 51 107 3 32 49 0 0 14 40 47 23 179 -19 107 36 40 106 30 28 108 17 52 105 49 34 107 36 1 48 0 0 14 40 40 24 179 -20 108 8 36 107 3 31 108 49 6 106 23 19 108 8 37 47 0 0 14 40 33 25 180 -21 108 40 41 107 36 39 109 20 32 106 57 5 108 41 22 46 0 0 14 40 25 26 181 -22 109 12 56 108 9 53 109 52 11 107 30 56 109 14 16 45 0 0 14 40 17 27 181 -23 109 45 22 108 43 14 110 24 3 108 4 52 109 47 21 44 0 0 14 40 9 28 182 -24 110 18 1 109 16 45 110 56 10 108 38 55 110 20 38 43 0 0 14 40 0 29 182 -25 110 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0 0 14 34 23 52 208 -55 128 13 15 127 20 24 128 46 16 126 47 52 128 34 14 15 0 0 14 34 7 52 210 -56 129 0 49 128 7 47 129 33 58 127 35 9 129 22 39 14 0 0 14 33 50 53 212 -57 129 49 21 128 56 5 130 22 39 128 23 20 130 12 4 13 0 0 14 33 34 53 213 -59 130 38 54 129 45 23 131 12 22 129 12 28 131 2 33 12 0 0 14 33 17 54 215 -60 131 29 32 130 35 42 132 3 12 130 2 36 131 54 7 11 0 0 14 33 0 54 217 -61 132 21 17 131 27 6 132 55 11 130 53 48 132 46 52 10 0 0 14 32 42 54 219 -62 133 14 14 132 19 40 133 48 24 131 46 8 133 40 52 9 0 0 14 32 25 55 221 -63 134 8 28 133 13 26 134 42 55 132 39 38 134 36 11 8 0 0 14 32 7 55 223 -65 135 4 2 134 8 30 135 38 48 133 34 24 135 32 53 7 0 0 14 31 49 55 225 -66 136 1 1 135 4 56 136 36 10 134 30 31 136 31 5 6 0 0 14 31 30 55 227 -67 136 59 32 136 2 49 137 35 5 135 28 2 137 30 52 5 0 0 14 31 12 55 229 -68 137 59 41 137 2 16 138 35 41 136 27 4 138 32 21 4 0 0 14 30 53 55 231 -69 139 1 33 138 3 22 139 38 4 137 27 43 139 35 40 3 0 0 14 30 34 55 233 -70 140 5 18 139 6 16 140 42 22 138 30 6 140 40 56 2 0 0 14 30 14 54 235 -71 141 11 3 140 11 4 141 48 44 139 34 21 141 48 19 1 0 0 14 29 55 54 237 -72 142 18 58 141 17 56 142 57 21 140 40 36 142 57 59 0 0 0 14 29 35 54 239 -73 143 29 14 142 27 1 144 8 23 141 49 0 144 10 9 - 1 0 0 14 29 14 53 241 -74 144 42 4 143 38 32 145 22 4 142 59 45 Latitude Latitude Latitude Latitude 145 0 0 - 1 40 12 14 29 1 53 242 -75 - 1 14 27 - 2 5 48 - 0 42 16 - 2 37 18 146 0 0 - 2 27 15 14 28 44 52 243 -75 - 2 1 48 - 2 52 33 - 1 30 1 - 3 23 41 147 0 0 - 3 12 53 14 28 28 52 245 -76 - 2 47 43 - 3 37 53 - 2 16 18 - 4 8 40 148 0 0 - 3 57 5 14 28 13 51 246 -76 - 3 32 13 - 4 21 49 - 3 1 9 - 4 52 16 149 0 0 - 4 39 55 14 27 57 51 247 -76 - 4 15 19 - 5 4 23 - 3 44 35 - 5 34 31 150 0 0 - 5 21 23 14 27 42 50 248 -76 - 4 57 2 - 5 45 35 - 4 26 38 - 6 15 25 151 0 0 - 6 1 31 14 27 27 50 249 -76 - 5 37 24 - 6 25 28 - 5 7 20 - 6 55 0 152 0 0 - 6 40 19 14 27 13 49 250 -76 - 6 16 27 - 7 4 3 - 5 46 40 - 7 33 18 153 0 0 - 7 17 50 14 26 59 48 251 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-15 51 24 -14 42 41 -16 17 25 -154 0 0 -15 13 32 14 20 38 2 252 -31 -14 52 13 -15 34 44 -14 25 39 .. .. .. -153 0 0 -14 55 38 14 20 37 1 252 -30 -14 34 12 -15 16 59 -14 7 28 .. .. .. Uncertainty in time = +/- 6 secs [Prediction of 2008 Apr 25.0] Data for the target star ------------------------ * name: TYC 6114-00149-1 * constellation : Corvus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 12 51 02.6419 DE: -17 51 37.450 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .021 ) * V mag [mag]: 9.2 * B mag [mag]: 10.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (792) Metcalfia approx. diameter [km]: 61 approx. diameter ["]: .054 distance from Earth [AU]: 1.56900 * orbital information: orbit source: Preston date of fit: 2008 Apr 24 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 848 number of rejected observations: 68 time covered by the observations: 1915 Feb 04 - 2008 Feb 18 1 sigma uncertainty ellipse (major, minor, PA): 0.040, 0.018, 111° remarks: * orbital elements for (792) Metcalfia : Mean anomaly = 62.10126762 deg Arg. of pericenter = 227.38993569 deg Long. of node = 265.30562799 deg Inclination = 8.60923493 deg Eccentricity = 0.13272882 Semimajor axis = 2.62121437 AU Perihelion dist = 2.27330369 AU Mag: H = 10.09, G = 0.15 Epoch of elements : MJD 54957.60500000 TDT (2009 May 06.605) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 May 6 792 Metcalfia 14h 31.4m UT 9.2 12 51 2.642-17 51 37.45TYC 6114-00149-1 10.0 14.0 61 7.5 1.569 -1.139 19.67 110.3315 -17.865 -38.69 16.68 14.5232 0.44281 0.36691 -2.90474 3.51152 0.00272 -0.00012 2000 60.3350292009 429.00000227.389936265.305628 8.6092350.13272882 2.6212144 2.273303710.3 5.00.15 RATE 2.3224710 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.045 0.027 106 1.62 0.033 0 54581.5020090506_0149-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 25, 06:43 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org