IOTA/IOTA-ES occultation update for (337) Devosa / HIP 68727 event on 2012 Jul 18, 13:34 UT Visible from SE Asia Summary ------- On 2012 Jul 18 UT, the 67 km diameter asteroid (337) Devosa will occult a 8.7 mag star in the constellation Virgo for observers along a path across SE Asia. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.9 mag to 13.6 mag (the magnitude of the asteroid) for at most 5.7 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: . The event at a glimpse ---------------------- * Rank: 88 * date and approx. time of event: 2012 Jul 18, 13:34 - 2012 Jul 18, 13:42 UT * geocentric midpoint of event [JD]: 2456127.0658 * magnitude of target star: 8.7 * magnitude drop [mag]: 4.9 * estimated maximum duration [s]: 5.7 * Moon: 0 % sunlit, 106° distance * Sun: 100° distance * rough path description: SE Asia Additional comments ------------------- close double star The occultation path -------------------- * approximate projected width [km]: 84 * 1 sigma uncertainty interval [path widths]: +/- 0.55 * 1 sigma uncertainty interval [seconds]: +/- 3.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .029 +/- .023) * 1 sigma uncertainty ellipse (major, minor, PA): ( .029", .023", 95° ) * approx speed of asteroid's shadow [km/s]: 11.6510 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 68727 by 337 Devosa on 2012 Jul 18 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 75 0 0 15 32 17 13 34 27 53 186 -1 15 9 11 15 55 30 14 43 55 16 21 11 76 0 0 15 21 42 13 34 37 53 188 -2 14 58 38 15 44 53 14 33 24 16 10 31 77 0 0 15 11 38 13 34 47 53 190 -3 14 48 36 15 34 47 14 23 24 16 0 23 78 0 0 15 2 6 13 34 56 53 191 -4 14 39 6 15 25 13 14 13 56 15 50 47 79 0 0 14 53 6 13 35 6 53 193 -5 14 30 8 15 16 12 14 5 0 15 41 44 80 0 0 14 44 39 13 35 16 53 195 -6 14 21 43 15 7 42 13 56 36 15 33 12 81 0 0 14 36 44 13 35 25 53 196 -7 14 13 49 14 59 45 13 48 45 15 25 13 82 0 0 14 29 21 13 35 35 52 198 -8 14 6 27 14 52 21 13 41 25 15 17 47 83 0 0 14 22 30 13 35 45 52 199 -9 13 59 38 14 45 29 13 34 37 15 10 54 84 0 0 14 16 12 13 35 54 52 201 -10 13 53 22 14 39 10 13 28 22 15 4 33 85 0 0 14 10 27 13 36 4 52 202 -11 13 47 38 14 33 23 13 22 40 14 58 45 86 0 0 14 5 15 13 36 13 51 204 -12 13 42 26 14 28 10 13 17 29 14 53 30 87 0 0 14 0 35 13 36 23 51 205 -13 13 37 48 14 23 29 13 12 52 14 48 48 88 0 0 13 56 28 13 36 32 51 207 -13 13 33 42 14 19 21 13 8 47 14 44 39 89 0 0 13 52 54 13 36 41 50 208 -14 13 30 8 14 15 46 13 5 14 14 41 3 90 0 0 13 49 52 13 36 51 50 209 -15 13 27 8 14 12 44 13 2 14 14 38 1 91 0 0 13 47 24 13 37 0 49 211 -16 13 24 40 14 10 15 12 59 47 14 35 31 92 0 0 13 45 28 13 37 9 49 212 -17 13 22 45 14 8 19 12 57 53 14 33 34 93 0 0 13 44 6 13 37 18 48 213 -18 13 21 23 14 6 56 12 56 31 14 32 11 94 0 0 13 43 16 13 37 27 48 214 -19 13 20 33 14 6 6 12 55 42 14 31 21 95 0 0 13 42 59 13 37 36 47 215 -20 13 20 16 14 5 49 12 55 25 14 31 3 96 0 0 13 43 15 13 37 45 47 217 -21 13 20 32 14 6 4 12 55 41 14 31 19 97 0 0 13 44 4 13 37 53 46 218 -22 13 21 21 14 6 53 12 56 29 14 32 8 98 0 0 13 45 25 13 38 2 45 219 -22 13 22 42 14 8 15 12 57 51 14 33 29 99 0 0 13 47 19 13 38 11 45 220 -23 13 24 36 14 10 9 12 59 44 14 35 24 100 0 0 13 49 46 13 38 19 44 221 -24 13 27 2 14 12 36 13 2 10 14 37 51 101 0 0 13 52 45 13 38 27 43 222 -25 13 30 1 14 15 36 13 5 8 14 40 52 102 0 0 13 56 16 13 38 35 43 222 -26 13 33 32 14 19 8 13 8 39 14 44 24 103 0 0 14 0 20 13 38 44 42 223 -27 13 37 35 14 23 12 13 12 41 14 48 30 104 0 0 14 4 57 13 38 52 41 224 -27 13 42 11 14 27 50 13 17 16 14 53 8 105 0 0 14 10 5 13 38 59 40 225 -28 13 47 18 14 32 59 13 22 22 14 58 18 106 0 0 14 15 46 13 39 7 40 226 -29 13 52 58 14 38 40 13 28 1 15 4 1 107 0 0 14 21 58 13 39 15 39 227 -30 13 59 9 14 44 54 13 34 11 15 10 15 108 0 0 14 28 42 13 39 22 38 227 -31 14 5 52 14 51 39 13 40 53 15 17 2 109 0 0 14 35 58 13 39 30 37 228 -31 14 13 7 14 58 56 13 48 6 15 24 20 110 0 0 14 43 45 13 39 37 36 229 -32 14 20 52 15 6 45 13 55 50 15 32 11 111 0 0 14 52 4 13 39 44 36 229 -33 14 29 10 15 15 5 14 4 6 15 40 32 112 0 0 15 0 53 13 39 51 35 230 -33 14 37 58 15 23 56 14 12 52 15 49 25 113 0 0 15 10 14 13 39 58 34 231 -34 14 47 17 15 33 18 14 22 9 15 58 49 114 0 0 15 20 5 13 40 4 33 231 -35 14 57 6 15 43 12 14 31 57 16 8 45 115 0 0 15 30 27 13 40 11 32 232 -35 15 7 27 15 53 35 14 42 15 16 19 10 116 0 0 15 41 20 13 40 17 31 232 -36 15 18 17 16 4 30 14 53 4 16 30 7 117 0 0 15 52 42 13 40 23 30 233 -37 15 29 37 16 15 54 15 4 22 16 41 34 118 0 0 16 4 34 13 40 29 29 233 -37 15 41 28 16 27 48 15 16 10 16 53 30 119 0 0 16 16 56 13 40 35 28 234 -38 15 53 47 16 40 13 15 28 27 17 5 57 120 0 0 16 29 48 13 40 40 28 234 -38 16 6 36 16 53 6 15 41 14 17 18 53 121 0 0 16 43 8 13 40 46 27 235 -39 16 19 54 17 6 29 15 54 29 17 32 18 122 0 0 16 56 57 13 40 51 26 235 -39 16 33 41 17 20 20 16 8 14 17 46 12 123 0 0 17 11 15 13 40 56 25 236 -40 16 47 56 17 34 40 16 22 26 18 0 35 124 0 0 17 26 0 13 41 1 24 236 -40 17 2 39 17 49 29 16 37 6 18 15 26 125 0 0 17 41 14 13 41 6 23 237 -41 17 17 50 18 4 45 16 52 15 18 30 46 126 0 0 17 56 55 13 41 11 22 237 -41 17 33 29 18 20 29 17 7 50 18 46 32 127 0 0 18 13 3 13 41 15 21 238 -42 17 49 34 18 36 40 17 23 53 19 2 47 128 0 0 18 29 38 13 41 19 20 238 -42 18 6 7 18 53 18 17 40 22 19 19 28 129 0 0 18 46 40 13 41 23 19 238 -42 18 23 5 19 10 22 17 57 18 19 36 35 130 0 0 19 4 7 13 41 27 18 239 -43 18 40 30 19 27 52 18 14 39 19 54 9 131 0 0 19 22 0 13 41 31 17 239 -43 18 58 20 19 45 48 18 32 26 20 12 8 132 0 0 19 40 18 13 41 34 16 240 -43 19 16 35 20 4 10 18 50 38 20 30 33 133 0 0 19 59 1 13 41 37 15 240 -43 19 35 15 20 22 56 19 9 15 20 49 22 134 0 0 20 18 9 13 41 40 14 240 -44 19 54 19 20 42 6 19 28 15 21 8 36 135 0 0 20 37 40 13 41 43 13 241 -44 20 13 47 21 1 40 19 47 40 21 28 14 136 0 0 20 57 34 13 41 46 12 241 -44 20 33 38 21 21 38 20 7 28 21 48 15 137 0 0 21 17 51 13 41 48 11 242 -44 20 53 52 21 41 58 20 27 38 22 8 39 138 0 0 21 38 31 13 41 50 10 242 -44 21 14 28 22 2 41 20 48 11 22 29 25 139 0 0 21 59 32 13 41 52 9 242 -44 21 35 26 22 23 45 21 9 6 22 50 34 140 0 0 22 20 54 13 41 54 8 243 -44 21 56 46 22 45 11 21 30 21 23 12 3 141 0 0 22 42 37 13 41 56 7 243 -44 22 18 26 23 6 58 21 51 58 23 33 53 142 0 0 23 4 41 13 41 57 6 244 -44 22 40 26 23 29 4 22 13 54 23 56 4 143 0 0 23 27 4 13 41 58 5 244 -44 23 2 45 23 51 30 22 36 10 24 18 33 144 0 0 23 49 45 13 41 59 4 244 -44 23 25 24 24 14 15 22 58 45 24 41 22 145 0 0 24 12 45 13 42 0 3 245 -44 23 48 20 24 37 19 23 21 38 25 4 29 146 0 0 24 36 3 13 42 1 2 245 -44 24 11 35 25 0 40 23 44 49 25 27 54 147 0 0 24 59 38 13 42 1 1 246 -43 24 35 6 25 24 18 .. .. .. 25 51 36 148 0 0 25 23 29 13 42 1 0 246 -43 24 58 54 25 48 12 .. .. .. .. .. .. Uncertainty in time = +/- 4 secs Prediction of 2012 Jun 21.0 Data for the target star ------------------------ * name: HIP 68727 * constellation : Virgo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 14 04 07.2465 DE: -21 18 48.947 * position source: mpos:HIP2 pm:HIP2 plx:HIP2 * standard error: RA,DE ["]: ( .026, .021 ) * V mag [mag]: 8.7 * B mag [mag]: 9.1 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (337) Devosa approx. diameter [km]: 67 approx. diameter ["]: .041 distance from Earth [AU]: 2.25900 * orbital information: orbit source: Preston date of fit: 2012 Jun 20 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 1086 number of rejected observations: 117 time covered by the observations: 1903 Sep 23 - 2012 Jun 10 1 sigma uncertainty ellipse (major, minor, PA): 0.013, 0.009, 118° remarks: * orbital elements for (337) Devosa : Mean anomaly = 134.93794404 deg Arg. of pericenter = 98.67849912 deg Long. of node = 355.51175676 deg Inclination = 7.85148067 deg Eccentricity = 0.13669368 Semimajor axis = 2.38390194 AU Perihelion dist = 2.05803761 AU Mag: H = 8.70, G = 0.19 Epoch of elements : MJD 56126.56600000 TDT (2012 Jul 18.566) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Jul 18 337 Devosa 13h 34.7m UT 8.7 14 4 7.247-21 18 48.95HIP 68727 9.1 13.6 67 5.7 2.259 1.807 -4.29 70.5768 -21.312 -22.11 20.88 13.5792 0.10245 0.59265 6.48340 -1.10047 0.00516 -0.00174 2000 133.1797272012 712.00000 98.678499355.511757 7.8514810.13669368 2.3839019 2.0580376 8.7 5.00.19 RATE 2.6777590 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.029 0.023 95 1.55 0.023 0 0-5 3 056099.0020120718__68727 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jun 20, 23:39 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org