IOTA/IOTA-ES occultation update for (6475) Refugium / TYC 6772-01316-1 event on 2008 May 15, 13:42 UT Visible from Philippines, Hong Kong, China Summary ------- On 2008 May 15 UT, the 33 km diameter asteroid (6475) Refugium will occult a 10.2 mag star in the constellation Libra for observers along a path across Philippines, Hong Kong, China. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.9 mag to 15.1 mag (the magnitude of the asteroid) for at most 2.4 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: 21 * date and approx. time of event: 2008 May 15, 13:35 - 2008 May 15, 13:49 UT * magnitude of target star: 10.2 * magnitude drop [mag]: 4.9 * estimated maximum duration [s]: 2.4 * Moon: 82 % sunlit, 52° distance * Sun: 171° distance * rough path description: Philippines, Hong Kong, China The occultation path -------------------- * approximate projected width [km]: 37 * 1 sigma uncertainty interval [path widths]: +/- 3.18 * 1 sigma uncertainty interval [seconds]: +/- 11.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .110 +/- .062) * 1 sigma uncertainty ellipse (major, minor, PA): ( .111", .061", 98° ) * approx speed of asteroid's shadow [km/s]: 13.8556 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6772-01316-1 by 6475 Refugium on 2008 May 15 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 88 0 0 39 33 28 13 49 35 0 127 -7 39 46 1 39 20 57 .. .. .. .. .. .. 89 0 0 38 57 49 13 49 35 1 128 -8 39 10 24 38 45 17 40 31 3 .. .. .. 90 0 0 38 21 41 13 49 35 2 129 -9 38 34 17 38 9 7 39 55 6 .. .. .. 91 0 0 37 45 5 13 49 34 3 129 -10 37 57 42 37 32 30 39 18 40 .. .. .. 92 0 0 37 8 2 13 49 34 4 130 -11 37 20 40 36 55 25 38 41 45 .. .. .. 93 0 0 36 30 32 13 49 33 5 130 -12 36 43 11 36 17 54 38 4 23 34 58 14 94 0 0 35 52 37 13 49 32 6 131 -13 36 5 17 35 39 58 37 26 35 34 20 12 95 0 0 35 14 17 13 49 31 7 132 -14 35 26 59 35 1 38 36 48 21 33 41 48 96 0 0 34 35 35 13 49 30 8 132 -15 34 48 17 34 22 55 36 9 43 33 3 1 97 0 0 33 56 31 13 49 28 9 133 -16 34 9 13 33 43 51 35 30 43 32 23 54 98 0 0 33 17 7 13 49 26 11 133 -17 33 29 49 33 4 26 34 51 21 31 44 28 99 0 0 32 37 23 13 49 25 12 134 -18 32 50 6 32 24 42 34 11 38 31 4 43 100 0 0 31 57 22 13 49 23 13 134 -19 32 10 4 31 44 41 33 31 36 30 24 42 101 0 0 31 17 4 13 49 21 14 135 -20 31 29 46 31 4 23 32 51 17 29 44 25 102 0 0 30 36 31 13 49 18 15 136 -21 30 49 13 30 23 51 32 10 42 29 3 54 103 0 0 29 55 45 13 49 16 16 136 -22 30 8 26 29 43 5 31 29 52 28 23 11 104 0 0 29 14 46 13 49 13 17 137 -23 29 27 27 29 2 7 30 48 50 27 42 17 105 0 0 28 33 37 13 49 10 18 137 -24 28 46 18 28 20 59 30 7 35 27 1 14 106 0 0 27 52 20 13 49 7 19 138 -26 28 4 59 27 39 42 29 26 11 26 20 3 107 0 0 27 10 55 13 49 3 20 138 -27 27 23 33 26 58 18 28 44 38 25 38 45 108 0 0 26 29 24 13 49 0 21 139 -28 26 42 1 26 16 48 28 2 58 24 57 22 109 0 0 25 47 49 13 48 56 22 139 -29 26 0 25 25 35 15 27 21 14 24 15 57 110 0 0 25 6 11 13 48 52 24 140 -30 25 18 46 24 53 38 26 39 25 23 34 29 111 0 0 24 24 33 13 48 48 25 140 -31 24 37 6 24 12 1 25 57 35 22 53 2 112 0 0 23 42 55 13 48 44 26 141 -32 23 55 26 23 30 25 25 15 45 22 11 36 113 0 0 23 1 19 13 48 39 27 141 -33 23 13 49 22 48 51 24 33 56 21 30 13 114 0 0 22 19 47 13 48 35 28 142 -35 22 32 15 22 7 21 23 52 10 20 48 54 115 0 0 21 38 20 13 48 30 29 142 -36 21 50 46 21 25 56 23 10 28 20 7 42 116 0 0 20 57 1 13 48 25 30 143 -37 21 9 24 20 44 39 22 28 53 19 26 37 117 0 0 20 15 49 13 48 20 31 143 -38 20 28 11 20 3 29 21 47 25 18 45 41 118 0 0 19 34 47 13 48 14 32 144 -39 19 47 7 19 22 30 21 6 6 18 4 55 119 0 0 18 53 57 13 48 9 33 145 -40 19 6 14 18 41 42 20 24 58 17 24 22 120 0 0 18 13 19 13 48 3 35 145 -41 18 25 34 18 1 7 19 44 3 16 44 1 121 0 0 17 32 56 13 47 57 36 146 -42 17 45 8 17 20 45 19 3 20 16 3 56 122 0 0 16 52 48 13 47 51 37 146 -44 17 4 57 16 40 40 18 22 53 15 24 6 123 0 0 16 12 56 13 47 45 38 147 -45 16 25 3 16 0 51 17 42 42 14 44 33 124 0 0 15 33 22 13 47 39 39 147 -46 15 45 27 15 21 20 17 2 48 14 5 18 125 0 0 14 54 8 13 47 32 40 148 -47 15 6 9 14 42 8 16 23 14 13 26 23 126 0 0 14 15 14 13 47 26 41 149 -48 14 27 13 14 3 17 15 43 59 12 47 49 127 0 0 13 36 41 13 47 19 42 149 -49 13 48 37 13 24 47 15 5 6 12 9 36 128 0 0 12 58 32 13 47 12 43 150 -50 13 10 25 12 46 40 14 26 35 11 31 46 129 0 0 12 20 45 13 47 5 44 151 -51 12 32 35 12 8 56 13 48 27 10 54 20 130 0 0 11 43 23 13 46 58 45 151 -52 11 55 11 11 31 37 13 10 44 10 17 19 131 0 0 11 6 27 13 46 51 46 152 -53 11 18 12 10 54 44 12 33 26 9 40 43 132 0 0 10 29 57 13 46 44 47 153 -54 10 41 39 10 18 17 11 56 35 9 4 34 133 0 0 9 53 55 13 46 36 48 154 -55 10 5 34 9 42 18 11 20 10 8 28 53 134 0 0 9 18 21 13 46 29 49 155 -56 9 29 57 9 6 46 10 44 14 7 53 39 135 0 0 8 43 15 13 46 21 50 156 -57 8 54 48 8 31 44 10 8 47 7 18 55 136 0 0 8 8 39 13 46 14 51 156 -58 8 20 10 7 57 11 9 33 50 6 44 39 137 0 0 7 34 34 13 46 6 52 157 -59 7 46 1 7 23 8 8 59 22 6 10 55 138 0 0 7 0 59 13 45 58 52 158 -60 7 12 24 6 49 36 8 25 26 5 37 41 139 0 0 6 27 56 13 45 50 53 159 -61 6 39 18 6 16 36 7 52 2 5 4 58 140 0 0 5 55 25 13 45 43 54 160 -62 6 6 44 5 44 8 7 19 9 4 32 48 141 0 0 5 23 27 13 45 35 55 162 -63 5 34 43 5 12 12 6 46 50 4 1 10 142 0 0 4 52 2 13 45 27 56 163 -64 5 3 15 4 40 50 6 15 4 3 30 4 143 0 0 4 21 10 13 45 19 57 164 -65 4 32 20 4 10 1 5 43 51 2 59 33 144 0 0 3 50 52 13 45 10 57 165 -66 4 1 59 3 39 46 5 13 13 2 29 34 145 0 0 3 21 8 13 45 2 58 167 -66 3 32 13 3 10 5 4 43 9 2 0 11 146 0 0 2 52 0 13 44 54 59 168 -67 3 3 2 2 40 59 4 13 40 1 31 21 147 0 0 2 23 26 13 44 46 59 170 -68 2 34 25 2 12 27 3 44 46 1 3 6 148 0 0 1 55 27 13 44 38 60 171 -68 2 6 24 1 44 32 3 16 28 0 35 26 149 0 0 1 28 4 13 44 29 61 173 -69 1 38 58 1 17 11 2 48 46 0 8 22 150 0 0 1 1 17 13 44 21 61 174 -70 1 12 9 0 50 26 2 21 40 - 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Uncertainty in time = +/- 13 secs [Prediction of 2008 May 8.0] Data for the target star ------------------------ * name: TYC 6772-01316-1 * constellation : Libra * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 15 30 53.8606 DE: -27 44 15.585 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .024, .027 ) * V mag [mag]: 10.2 * B mag [mag]: 10.7 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (6475) Refugium approx. diameter [km]: 33 approx. diameter ["]: .020 distance from Earth [AU]: 2.30400 * orbital information: orbit source: Preston date of fit: 2008 May 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 624 number of rejected observations: 15 time covered by the observations: 1954 Nov 23 - 2008 May 05 1 sigma uncertainty ellipse (major, minor, PA): 0.108, 0.055, 98° remarks: * orbital elements for (6475) Refugium : Mean anomaly = 260.16337610 deg Arg. of pericenter = 76.64431156 deg Long. of node = 277.32955920 deg Inclination = 8.94176746 deg Eccentricity = 0.16763718 Semimajor axis = 3.13651072 AU Perihelion dist = 2.61071491 AU Mag: H = 10.98, G = 0.15 Epoch of elements : MJD 54601.57100000 TDT (2008 May 15.571) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 15 6475 Refugium 13h 42.7m UT 10.2 15 30 53.861-27 44 15.59TYC 6772-01316-1 10.7 15.1 33 2.4 2.304 -2.106 10.45 153.3995 -27.740 -26.57 19.04 13.7112 0.15099 0.40414 -7.32613 2.73646 0.00001 0.00086 2000 259.8846292008 514.00000 76.644312277.329559 8.9417670.16763718 3.1365107 2.610714910.4 5.00.15 RATE 1.7743280 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.111 0.061 98 4.18 0.063 0 54594.5020080515_1316-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 May 08, 03:20 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org