IOTA/IOTA-ES occultation update for (849) Ara / TYC 5629-00554-1 event on 2009 Jun 09, 15:49 UT Visible from Summary ------- On 2009 Jun 09 UT, the 62 km diameter asteroid (849) Ara will occult a 11.6 mag star in the constellation Ophiuchus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 0.8 mag to 11.7 mag (the magnitude of the asteroid) for at most 5.3 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: 81 * date and approx. time of event: 2009 Jun 09, 15:43 - 2009 Jun 09, 15:55 UT * magnitude of target star: 11.6 * magnitude drop [mag]: 0.8 * estimated maximum duration [s]: 5.3 * Moon: 97 % sunlit, 32° distance * Sun: 164° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 90 * 1 sigma uncertainty interval [path widths]: +/- 0.67 * 1 sigma uncertainty interval [seconds]: +/- 3.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .043 +/- .027) * 1 sigma uncertainty ellipse (major, minor, PA): ( .043", .027", 84° ) * approx speed of asteroid's shadow [km/s]: 11.7589 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5629-00554-1 by 849 Ara on 2009 Jun 9 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 Latitude Latitude Latitude Latitude 101 0 0 65 27 52 15 55 10 16 165 0 66 14 29 64 42 28 67 19 6 63 43 25 102 0 0 64 47 37 15 55 7 17 166 -1 65 34 18 64 2 10 66 39 2 63 3 2 103 0 0 64 6 17 15 55 4 17 167 -2 64 53 1 63 20 49 65 57 47 62 21 39 104 0 0 63 23 55 15 55 0 18 168 -3 64 10 38 62 38 27 65 15 23 61 39 19 105 0 0 62 40 32 15 54 57 19 169 -4 63 27 11 61 55 6 64 31 52 60 56 1 106 0 0 61 56 9 15 54 53 20 170 -4 62 42 43 61 10 48 63 47 17 60 11 49 107 0 0 61 10 49 15 54 49 21 171 -5 61 57 16 60 25 36 63 1 39 59 26 45 108 0 0 60 24 35 15 54 44 21 172 -6 61 10 52 59 39 30 62 15 1 58 40 51 109 0 0 59 37 29 15 54 39 22 173 -7 60 23 35 58 52 35 61 27 26 57 54 9 110 0 0 58 49 34 15 54 34 23 174 -8 59 35 26 58 4 53 60 38 57 57 6 42 111 0 0 58 0 53 15 54 29 24 175 -9 58 46 30 57 16 27 59 49 39 56 18 34 112 0 0 57 11 30 15 54 24 25 176 -10 57 56 50 56 27 20 58 59 33 55 29 47 113 0 0 56 21 28 15 54 18 26 177 -11 57 6 29 55 37 35 58 8 44 54 40 24 114 0 0 55 30 51 15 54 12 27 178 -11 56 15 31 54 47 17 57 17 16 53 50 28 115 0 0 54 39 41 15 54 6 27 180 -12 55 24 0 53 56 27 56 25 14 53 0 4 116 0 0 53 48 4 15 53 59 28 181 -13 54 31 59 53 5 11 55 32 39 52 9 14 117 0 0 52 56 2 15 53 52 29 182 -14 53 39 33 52 13 31 54 39 38 51 18 2 118 0 0 52 3 39 15 53 45 30 183 -15 52 46 45 51 21 31 53 46 14 50 26 31 119 0 0 51 10 58 15 53 38 31 184 -16 51 53 40 50 29 15 52 52 31 49 34 44 120 0 0 50 18 5 15 53 30 32 185 -17 51 0 20 49 36 46 51 58 32 48 42 46 121 0 0 49 25 1 15 53 22 32 186 -18 50 6 49 48 44 8 51 4 23 47 50 39 122 0 0 48 31 51 15 53 14 33 188 -19 49 13 12 47 51 23 50 10 6 46 58 26 123 0 0 47 38 38 15 53 6 34 189 -20 48 19 32 46 58 36 49 15 46 46 6 11 124 0 0 46 45 26 15 52 57 35 190 -20 47 25 51 46 5 50 48 21 26 45 13 58 125 0 0 45 52 17 15 52 48 36 191 -21 46 32 15 45 13 7 47 27 9 44 21 48 126 0 0 44 59 15 15 52 39 36 193 -22 45 38 45 44 20 31 46 32 59 43 29 45 127 0 0 44 6 23 15 52 30 37 194 -23 44 45 25 43 28 5 45 38 59 42 37 52 128 0 0 43 13 44 15 52 21 38 195 -24 43 52 18 42 35 52 44 45 12 41 46 11 129 0 0 42 21 20 15 52 12 38 197 -24 42 59 27 41 43 54 43 51 41 40 54 46 130 0 0 41 29 14 15 52 2 39 198 -25 42 6 54 40 52 14 42 58 29 40 3 38 131 0 0 40 37 29 15 51 52 39 199 -26 41 14 42 40 0 54 42 5 39 39 12 50 132 0 0 39 46 6 15 51 42 40 201 -27 40 22 53 39 9 57 41 13 12 38 22 24 133 0 0 38 55 9 15 51 32 41 202 -27 39 31 30 38 19 24 40 21 12 37 32 23 134 0 0 38 4 39 15 51 22 41 204 -28 38 40 34 37 29 19 39 29 40 36 42 49 135 0 0 37 14 39 15 51 12 41 205 -29 37 50 9 36 39 43 38 38 39 35 53 43 136 0 0 36 25 10 15 51 2 42 207 -29 37 0 15 35 50 37 37 48 10 35 5 7 137 0 0 35 36 13 15 50 52 42 208 -30 36 10 54 35 2 4 36 58 15 34 17 3 138 0 0 34 47 52 15 50 41 43 210 -30 35 22 9 34 14 5 36 8 56 33 29 33 139 0 0 34 0 6 15 50 31 43 211 -31 34 34 0 33 26 41 35 20 14 32 42 38 140 0 0 33 12 58 15 50 20 43 213 -31 33 46 30 32 39 55 34 32 12 31 56 19 141 0 0 32 26 29 15 50 10 43 215 -32 32 59 38 31 53 47 33 44 49 31 10 38 142 0 0 31 40 40 15 49 59 43 216 -32 32 13 28 31 8 19 32 58 8 30 25 36 143 0 0 30 55 32 15 49 49 44 218 -33 31 27 59 30 23 31 32 12 10 29 41 14 144 0 0 30 11 7 15 49 38 44 219 -33 30 43 13 29 39 25 31 26 55 28 57 34 145 0 0 29 27 24 15 49 28 44 221 -33 29 59 10 28 56 2 30 42 24 28 14 35 146 0 0 28 44 26 15 49 18 44 222 -34 29 15 53 28 13 22 29 58 40 27 32 19 147 0 0 28 2 13 15 49 7 44 224 -34 28 33 21 27 31 27 29 15 41 26 50 48 148 0 0 27 20 45 15 48 57 43 225 -34 27 51 35 26 50 17 28 33 29 26 10 0 149 0 0 26 40 4 15 48 47 43 227 -34 27 10 36 26 9 53 27 52 5 25 29 58 150 0 0 26 0 10 15 48 36 43 228 -34 26 30 24 25 30 15 27 11 30 24 50 42 151 0 0 25 21 3 15 48 26 43 229 -35 25 51 1 24 51 25 26 31 43 24 12 12 152 0 0 24 42 44 15 48 16 43 231 -35 25 12 26 24 13 22 25 52 45 23 34 30 153 0 0 24 5 14 15 48 6 42 232 -35 24 34 40 23 36 7 25 14 37 22 57 34 154 0 0 23 28 32 15 47 57 42 233 -35 23 57 43 22 59 40 24 37 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Uncertainty in time = +/- 4 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 5629-00554-1 * constellation : Ophiuchus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 16 47 54.3693 DE: -08 03 56.152 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .027, .021 ) * V mag [mag]: 11.6 * B mag [mag]: 12.7 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (849) Ara approx. diameter [km]: 62 approx. diameter ["]: .052 distance from Earth [AU]: 1.63000 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 811 number of rejected observations: 91 time covered by the observations: 1919 Jul 03 - 2008 Feb 13 1 sigma uncertainty ellipse (major, minor, PA): 0.034, 0.016, 80° remarks: * orbital elements for (849) Ara : Mean anomaly = 335.09543467 deg Arg. of pericenter = 64.21084512 deg Long. of node = 228.48712033 deg Inclination = 19.48833618 deg Eccentricity = 0.19605691 Semimajor axis = 3.15260698 AU Perihelion dist = 2.53451661 AU Mag: H = 8.05, G = 0.15 Epoch of elements : MJD 54991.65900000 TDT (2009 Jun 09.659) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jun 9 849 Ara 15h 49.5m UT 11.6 16 47 54.369- 8 3 56.15TYC 5629-00554-1 12.7 11.7 62 5.3 1.630 -1.974 20.55 116.4629 -8.070 -57.54 22.98 15.8244 0.41472 0.59164 -5.43428 3.81038 0.00050 -0.00141 2000 334.8033252009 6 8.00000 64.210845228.487120 19.4883360.19605691 3.1526070 2.5345166 8.1 5.00.15 RATE 1.7607570 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.043 0.027 84 1.67 0.035 0 54545.5020090609_0554-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 09:10 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org