IOTA/IOTA-ES occultation update for (331) Etheridgea / TYC 6379-01473-1 event on 2009 Jun 02, 16:14 UT Visible from Summary ------- On 2009 Jun 02 UT, the 75 km diameter asteroid (331) Etheridgea will occult a 12.1 mag star in the constellation Aquarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.7 mag to 14.7 mag (the magnitude of the asteroid) for at most 7.8 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: 46 * date and approx. time of event: 2009 Jun 02, 16:04 - 2009 Jun 02, 16:18 UT * magnitude of target star: 12.1 * magnitude drop [mag]: 2.7 * estimated maximum duration [s]: 7.8 * Moon: 76 % sunlit, 130° distance * Sun: 107° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 81 * 1 sigma uncertainty interval [path widths]: +/- 1.42 * 1 sigma uncertainty interval [seconds]: +/- 6.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .040 +/- .063) * 1 sigma uncertainty ellipse (major, minor, PA): ( .063", .040", 358° ) * approx speed of asteroid's shadow [km/s]: 9.5452 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6379-01473-1 by 331 Etheridgea on 2009 Jun 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 ' " Latitude Latitude Latitude Latitude 98 0 0 -26 45 52 16 4 19 1 112 -71 -27 9 41 -26 22 7 -28 17 45 .. .. .. 99 0 0 -27 7 47 16 4 20 2 111 -72 -27 31 36 -26 44 3 -28 39 37 .. .. .. 100 0 0 -27 29 34 16 4 20 3 111 -72 -27 53 22 -27 5 51 -29 1 21 .. .. .. 101 0 0 -27 51 13 16 4 21 3 111 -73 -28 15 0 -27 27 30 -29 22 57 .. .. .. 102 0 0 -28 12 43 16 4 22 4 110 -74 -28 36 29 -27 49 1 -29 44 24 -26 42 5 103 0 0 -28 34 4 16 4 23 5 110 -75 -28 57 49 -28 10 23 -30 5 41 -27 3 30 104 0 0 -28 55 15 16 4 24 6 109 -75 -29 18 59 -28 31 35 -30 26 49 -27 24 45 105 0 0 -29 16 16 16 4 25 7 109 -76 -29 39 59 -28 52 37 -30 47 45 -27 45 50 106 0 0 -29 37 7 16 4 27 8 108 -77 -30 0 49 -29 13 29 -31 8 31 -28 6 44 107 0 0 -29 57 46 16 4 29 9 108 -77 -30 21 27 -29 34 10 -31 29 6 -28 27 29 108 0 0 -30 18 14 16 4 31 10 107 -78 -30 41 54 -29 54 39 -31 49 29 -28 48 1 109 0 0 -30 38 31 16 4 33 11 107 -78 -31 2 9 -30 14 57 -32 9 40 -29 8 23 110 0 0 -30 58 35 16 4 35 12 106 -78 -31 22 12 -30 35 2 -32 29 39 -29 28 32 111 0 0 -31 18 26 16 4 38 13 105 -79 -31 42 2 -30 54 55 -32 49 25 -29 48 29 112 0 0 -31 38 5 16 4 40 14 105 -79 -32 1 39 -31 14 35 -33 8 57 -30 8 14 113 0 0 -31 57 30 16 4 43 15 104 -79 -32 21 3 -31 34 2 -33 28 16 -30 27 45 114 0 0 -32 16 42 16 4 46 16 104 -79 -32 40 13 -31 53 16 -33 47 22 -30 47 3 115 0 0 -32 35 40 16 4 49 17 103 -79 -32 59 9 -32 12 15 -34 6 13 -31 6 7 116 0 0 -32 54 23 16 4 53 17 103 -79 -33 17 50 -32 31 1 -34 24 49 -31 24 58 117 0 0 -33 12 52 16 4 56 18 102 -79 -33 36 18 -32 49 31 -34 43 11 -31 43 33 118 0 0 -33 31 7 16 5 0 19 101 -79 -33 54 30 -33 7 47 -35 1 18 -32 1 54 119 0 0 -33 49 5 16 5 4 20 101 -78 -34 12 27 -33 25 48 -35 19 10 -32 20 0 120 0 0 -34 6 49 16 5 8 21 100 -78 -34 30 9 -33 43 33 -35 36 46 -32 37 51 121 0 0 -34 24 17 16 5 12 22 100 -78 -34 47 34 -34 1 3 -35 54 6 -32 55 26 122 0 0 -34 41 29 16 5 16 23 99 -77 -35 4 44 -34 18 17 -36 11 10 -33 12 46 123 0 0 -34 58 25 16 5 20 24 98 -77 -35 21 38 -34 35 15 -36 27 58 -33 29 49 124 0 0 -35 15 4 16 5 25 24 98 -76 -35 38 16 -34 51 57 -36 44 30 -33 46 37 125 0 0 -35 31 27 16 5 30 25 97 -75 -35 54 36 -35 8 22 -37 0 44 -34 3 7 126 0 0 -35 47 33 16 5 34 26 96 -75 -36 10 40 -35 24 30 -37 16 42 -34 19 21 127 0 0 -36 3 22 16 5 39 27 96 -74 -36 26 27 -35 40 21 -37 32 23 -34 35 18 128 0 0 -36 18 54 16 5 44 28 95 -73 -36 41 57 -35 55 55 -37 47 47 -34 50 58 129 0 0 -36 34 9 16 5 49 29 94 -73 -36 57 10 -36 11 12 -38 2 53 -35 6 21 130 0 0 -36 49 6 16 5 55 30 94 -72 -37 12 5 -36 26 11 -38 17 42 -35 21 27 131 0 0 -37 3 46 16 6 0 30 93 -71 -37 26 43 -36 40 53 -38 32 13 -35 36 15 132 0 0 -37 18 8 16 6 5 31 92 -71 -37 41 2 -36 55 17 -38 46 27 -35 50 45 133 0 0 -37 32 12 16 6 11 32 91 -70 -37 55 4 -37 9 24 -39 0 23 -36 4 57 134 0 0 -37 45 58 16 6 17 33 91 -69 -38 8 48 -37 23 12 -39 14 0 -36 18 51 135 0 0 -37 59 26 16 6 23 34 90 -68 -38 22 14 -37 36 42 -39 27 20 -36 32 27 136 0 0 -38 12 36 16 6 28 34 89 -68 -38 35 22 -37 49 54 -39 40 21 -36 45 45 137 0 0 -38 25 28 16 6 34 35 88 -67 -38 48 11 -38 2 48 -39 53 5 -36 58 45 138 0 0 -38 38 1 16 6 41 36 87 -66 -39 0 42 -38 15 23 -40 5 30 -37 11 26 139 0 0 -38 50 16 16 6 47 37 87 -65 -39 12 55 -38 27 40 -40 17 36 -37 23 49 140 0 0 -39 2 12 16 6 53 38 86 -65 -39 24 49 -38 39 39 -40 29 24 -37 35 53 141 0 0 -39 13 50 16 6 59 38 85 -64 -39 36 25 -38 51 18 -40 40 54 -37 47 39 142 0 0 -39 25 9 16 7 6 39 84 -63 -39 47 42 -39 2 39 -40 52 5 -37 59 6 143 0 0 -39 36 9 16 7 12 40 83 -62 -39 58 41 -39 13 42 -41 2 58 -38 10 14 144 0 0 -39 46 51 16 7 19 41 82 -62 -40 9 20 -39 24 26 -41 13 32 -38 21 3 145 0 0 -39 57 14 16 7 26 41 81 -61 -40 19 41 -39 34 50 -41 23 47 -38 31 33 146 0 0 -40 7 18 16 7 32 42 81 -60 -40 29 44 -39 44 57 -41 33 44 -38 41 45 147 0 0 -40 17 4 16 7 39 43 80 -59 -40 39 27 -39 54 44 -41 43 22 -38 51 37 148 0 0 -40 26 30 16 7 46 44 79 -59 -40 48 52 -40 4 12 -41 52 41 -39 1 10 149 0 0 -40 35 38 16 7 53 44 78 -58 -40 57 57 -40 13 21 -42 1 42 -39 10 25 150 0 0 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-42 32 15 -41 48 19 -43 35 2 -40 46 18 164 0 0 -42 14 38 16 9 45 55 61 -46 -42 36 37 -41 52 43 -43 39 21 -40 50 45 165 0 0 -42 18 43 16 9 53 55 59 -45 -42 40 40 -41 56 48 -43 43 22 -40 54 53 166 0 0 -42 22 28 16 10 1 56 58 -45 -42 44 25 -42 0 35 -43 47 4 -40 58 41 167 0 0 -42 25 55 16 10 9 57 57 -44 -42 47 51 -42 4 2 -43 50 27 -41 2 11 168 0 0 -42 29 2 16 10 17 57 55 -43 -42 50 57 -42 7 10 -43 53 32 -41 5 21 169 0 0 -42 31 51 16 10 25 58 54 -42 -42 53 45 -42 9 59 -43 56 18 -41 8 12 170 0 0 -42 34 20 16 10 34 58 52 -42 -42 56 14 -42 12 29 -43 58 45 -41 10 44 171 0 0 -42 36 31 16 10 42 59 51 -41 -42 58 24 -42 14 41 -44 0 54 -41 12 56 172 0 0 -42 38 23 16 10 50 59 49 -40 -43 0 16 -42 16 33 -44 2 44 -41 14 50 173 0 0 -42 39 55 16 10 58 60 48 -39 -43 1 48 -42 18 6 -44 4 15 -41 16 24 174 0 0 -42 41 9 16 11 7 61 46 -39 -43 3 1 -42 19 20 -44 5 27 -41 17 39 175 0 0 -42 42 4 16 11 15 61 44 -38 -43 3 56 -42 20 15 -44 6 21 -41 18 35 176 0 0 -42 42 40 16 11 23 62 43 -37 -43 4 32 -42 20 51 -44 6 56 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17 44 16 13 25 67 13 -26 -42 39 41 -41 55 50 -43 42 20 -40 53 56 -169 0 0 -42 13 34 16 13 34 67 11 -26 -42 35 32 -41 51 39 -43 38 13 -40 49 43 -168 0 0 -42 9 4 16 13 43 67 8 -25 -42 31 3 -41 47 9 -43 33 48 -40 45 10 -167 0 0 -42 4 16 16 13 52 68 6 -24 -42 26 16 -41 42 19 -43 29 3 -40 40 17 -166 0 0 -41 59 8 16 14 1 68 3 -23 -42 21 9 -41 37 10 -43 24 0 -40 35 5 -165 0 0 -41 53 41 16 14 10 68 0 -23 -42 15 43 -41 31 42 -43 18 37 -40 29 34 -164 0 0 -41 47 54 16 14 19 68 358 -22 -42 9 58 -41 25 54 -43 12 55 -40 23 43 -163 0 0 -41 41 49 16 14 28 68 355 -21 -42 3 53 -41 19 47 -43 6 54 -40 17 32 -162 0 0 -41 35 24 16 14 37 68 353 -20 -41 57 30 -41 13 21 -43 0 35 -40 11 2 -161 0 0 -41 28 39 16 14 47 68 350 -19 -41 50 47 -41 6 35 -42 53 56 -40 4 12 -160 0 0 -41 21 35 16 14 56 68 347 -19 -41 43 44 -40 59 30 -42 46 58 -39 57 3 -159 0 0 -41 14 12 16 15 5 68 345 -18 -41 36 23 -40 52 5 -42 39 40 -39 49 34 -158 0 0 -41 6 30 16 15 14 68 342 -17 -41 28 42 -40 44 21 -42 32 4 -39 41 46 -157 0 0 -40 58 28 16 15 23 68 339 -16 -41 20 41 -40 36 17 -42 24 8 -39 33 37 -156 0 0 -40 50 6 16 15 33 68 337 -15 -41 12 22 -40 27 54 -42 15 53 -39 25 10 -155 0 0 -40 41 25 16 15 42 67 334 -15 -41 3 42 -40 19 12 -42 7 19 -39 16 22 -154 0 0 -40 32 25 16 15 51 67 332 -14 -40 54 44 -40 10 10 -41 58 26 -39 7 15 -153 0 0 -40 23 5 16 16 1 67 329 -13 -40 45 26 -40 0 48 -41 49 13 -38 57 49 -152 0 0 -40 13 26 16 16 10 67 327 -12 -40 35 49 -39 51 7 -41 39 41 -38 48 2 -151 0 0 -40 3 27 16 16 19 66 324 -11 -40 25 52 -39 41 6 -41 29 50 -38 37 56 -150 0 0 -39 53 9 16 16 29 66 322 -11 -40 15 36 -39 30 46 -41 19 40 -38 27 31 -149 0 0 -39 42 32 16 16 38 66 320 -10 -40 5 0 -39 20 7 -41 9 10 -38 16 46 -148 0 0 -39 31 35 16 16 48 65 317 -9 -39 54 6 -39 9 8 -40 58 21 -38 5 41 -147 0 0 -39 20 19 16 16 57 65 315 -8 -39 42 51 -38 57 50 -40 47 13 -37 54 17 -146 0 0 -39 8 43 16 17 6 64 313 -7 -39 31 18 -38 46 12 -40 35 45 -37 42 34 -145 0 0 -38 56 48 16 17 16 64 311 -7 -39 19 25 -38 34 15 -40 23 59 -37 30 31 -144 0 0 -38 44 34 16 17 25 63 309 -6 -39 7 13 -38 21 59 -40 11 53 -37 18 8 -143 0 0 -38 32 0 16 17 35 63 307 -5 -38 54 42 -38 9 23 -39 59 28 -37 5 26 -142 0 0 -38 19 8 16 17 44 62 305 -4 -38 41 51 -37 56 28 -39 46 44 -36 52 25 -141 0 0 -38 5 56 16 17 53 62 303 -3 -38 28 42 -37 43 14 -39 33 41 -36 39 5 -140 0 0 -37 52 25 16 18 3 61 301 -2 -38 15 13 -37 29 41 -39 20 19 -36 25 26 -139 0 0 -37 38 35 16 18 12 61 300 -2 -38 1 26 -37 15 49 -39 6 38 -36 11 28 -138 0 0 -37 24 27 16 18 22 60 298 -1 -37 47 19 -37 1 38 -38 52 38 -35 57 10 Uncertainty in time = +/- 11 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 6379-01473-1 * constellation : Aquarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 21 59 26.1712 DE: -19 49 58.026 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .027, .061 ) * V mag [mag]: 12.1 * B mag [mag]: 12.7 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (331) Etheridgea approx. diameter [km]: 75 approx. diameter ["]: .044 distance from Earth [AU]: 2.34500 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 866 number of rejected observations: 85 time covered by the observations: 1904 Sep 10 - 2008 Feb 13 1 sigma uncertainty ellipse (major, minor, PA): 0.030, 0.016, 66° remarks: * orbital elements for (331) Etheridgea : Mean anomaly = 317.47725377 deg Arg. of pericenter = 333.93894042 deg Long. of node = 22.11220028 deg Inclination = 6.04968784 deg Eccentricity = 0.10339268 Semimajor axis = 3.02645558 AU Perihelion dist = 2.71354223 AU Mag: H = 9.61, G = 0.15 Epoch of elements : MJD 54984.67700000 TDT (2009 Jun 02.677) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jun 2 331 Etheridgea 16h 14.7m UT 12.1 21 59 26.171-19 49 58.03TYC 6379-01473-1 12.7 14.7 75 7.8 2.345 1.422 2.26 -165.0739 -19.834 -64.15 22.26 16.2445 0.04248 -0.36765 5.35356 0.60437 -0.00505 -0.00165 2000 316.6017262009 529.00000333.938940 22.112200 6.0496880.10339268 3.0264556 2.7135422 9.6 5.00.15 RATE 1.8719860 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.063 0.040 358 2.42 0.063 0 54545.5020090602_1473-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 08:50 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org