IOTA/IOTA-ES occultation update for (69) Hesperia / UCAC2 26785991 event on 2012 Nov 09, 23:52 UT Visible from E Canada, N USA Summary ------- On 2012 Nov 09 UT, the 133 km diameter asteroid (69) Hesperia will occult a 11.3 mag star in the constellation Sagittarius for observers along a path across E Canada, N USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.2 mag to 13.3 mag (the magnitude of the asteroid) for at most 5.5 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: UCAC. The event at a glimpse ---------------------- * Rank: 77 * date and approx. time of event: 2012 Nov 09, 23:52 - 2012 Nov 09, 23:54 UT * geocentric midpoint of event [JD]: 2456241.49480417 * magnitude of target star: 11.3 * magnitude drop [mag]: 2.2 * estimated maximum duration [s]: 5.5 * Moon: 20 % sunlit, 124° distance * Sun: 72° distance * rough path description: E Canada, N USA The occultation path -------------------- * approximate projected width [km]: 269 * 1 sigma uncertainty interval [path widths]: +/- 0.72 * 1 sigma uncertainty interval [seconds]: +/- 6.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .058 +/- .037) * 1 sigma uncertainty ellipse (major, minor, PA): ( .058", .037", 90° ) * approx speed of asteroid's shadow [km/s]: 24.1845 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 26785991 by 69 Hesperia on 2012 Nov 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 - 44 54 19 59 0 0 23 54 39 1 240 -38 ... .. .. - 49 56 24 ... .. .. - 57 34 28 - 48 28 45 58 0 0 23 54 38 3 237 -37 - 43 37 51 - 53 30 19 ... .. .. - 61 11 46 Latitude Latitude Latitude Latitude - 50 0 0 57 34 32 23 54 38 4 236 -37 56 14 3 58 58 59 .. .. .. 61 9 5 - 51 0 0 57 17 50 23 54 37 5 235 -36 55 57 31 58 42 6 .. .. .. 60 51 52 - 52 0 0 57 1 11 23 54 37 5 234 -36 55 41 1 58 25 15 .. .. .. 60 34 41 - 53 0 0 56 44 35 23 54 36 6 233 -36 55 24 35 58 8 28 .. .. .. 60 17 33 - 54 0 0 56 28 2 23 54 35 6 232 -35 55 8 13 57 51 44 53 19 1 60 0 28 - 55 0 0 56 11 34 23 54 35 7 231 -35 54 51 55 57 35 4 53 2 56 59 43 27 - 56 0 0 55 55 11 23 54 34 8 231 -34 54 35 42 57 18 28 52 46 56 59 26 31 - 57 0 0 55 38 53 23 54 33 8 230 -34 54 19 35 57 1 58 52 31 1 59 9 39 - 58 0 0 55 22 41 23 54 32 9 229 -33 54 3 33 56 45 34 52 15 13 58 52 53 - 59 0 0 55 6 35 23 54 31 9 228 -33 53 47 38 56 29 15 51 59 31 58 36 12 - 60 0 0 54 50 36 23 54 30 10 227 -33 53 31 50 56 13 4 51 43 57 58 19 39 - 61 0 0 54 34 44 23 54 29 11 226 -32 53 16 10 55 57 0 51 28 30 58 3 12 - 62 0 0 54 19 1 23 54 28 11 225 -32 53 0 37 55 41 3 51 13 11 57 46 54 - 63 0 0 54 3 25 23 54 27 12 225 -31 52 45 13 55 25 15 50 58 0 57 30 44 - 64 0 0 53 47 59 23 54 26 13 224 -31 52 29 57 55 9 36 50 42 58 57 14 42 - 65 0 0 53 32 42 23 54 24 13 223 -30 52 14 51 54 54 6 50 28 6 56 58 50 - 66 0 0 53 17 35 23 54 23 14 222 -29 51 59 55 54 38 46 50 13 24 56 43 8 - 67 0 0 53 2 38 23 54 21 14 221 -29 51 45 10 54 23 37 49 58 52 56 27 36 - 68 0 0 52 47 52 23 54 20 15 220 -28 51 30 35 54 8 38 49 44 31 56 12 16 - 69 0 0 52 33 17 23 54 18 15 219 -28 51 16 11 53 53 51 49 30 21 55 57 7 - 70 0 0 52 18 54 23 54 17 16 218 -27 51 1 59 53 39 16 49 16 22 55 42 9 - 71 0 0 52 4 43 23 54 15 17 217 -27 50 47 59 53 24 52 49 2 36 55 27 25 - 72 0 0 51 50 45 23 54 13 17 217 -26 50 34 12 53 10 42 48 49 2 55 12 53 - 73 0 0 51 37 0 23 54 11 18 216 -25 50 20 37 52 56 45 48 35 41 54 58 35 - 74 0 0 51 23 29 23 54 9 18 215 -25 50 7 16 52 43 1 48 22 33 54 44 30 - 75 0 0 51 10 11 23 54 7 19 214 -24 49 54 9 52 29 32 48 9 39 54 30 40 - 76 0 0 50 57 8 23 54 5 19 213 -24 49 41 16 52 16 17 47 56 59 54 17 5 - 77 0 0 50 44 20 23 54 3 20 212 -23 49 28 38 52 3 17 47 44 34 54 3 45 - 78 0 0 50 31 46 23 54 1 20 211 -22 49 16 15 51 50 32 47 32 23 53 50 40 - 79 0 0 50 19 29 23 53 59 21 210 -22 49 4 7 51 38 3 47 20 27 53 37 52 - 80 0 0 50 7 27 23 53 56 21 209 -21 48 52 15 51 25 50 47 8 47 53 25 20 - 81 0 0 49 55 41 23 53 54 22 208 -20 48 40 39 51 13 53 46 57 23 53 13 5 - 82 0 0 49 44 12 23 53 52 22 207 -20 48 29 19 51 2 14 46 46 15 53 1 7 - 83 0 0 49 33 0 23 53 49 23 206 -19 48 18 16 50 50 52 46 35 24 52 49 27 - 84 0 0 49 22 5 23 53 47 23 205 -18 48 7 31 50 39 47 46 24 49 52 38 5 - 85 0 0 49 11 28 23 53 44 24 204 -18 47 57 2 50 29 0 46 14 32 52 27 1 - 86 0 0 49 1 9 23 53 42 24 203 -17 47 46 52 50 18 31 46 4 32 52 16 16 - 87 0 0 48 51 8 23 53 39 24 202 -16 47 36 59 50 8 21 45 54 50 52 5 50 - 88 0 0 48 41 26 23 53 36 25 201 -16 47 27 25 49 58 29 45 45 26 51 55 43 - 89 0 0 48 32 2 23 53 34 25 200 -15 47 18 9 49 48 57 45 36 20 51 45 55 - 90 0 0 48 22 58 23 53 31 26 199 -14 47 9 12 49 39 44 45 27 33 51 36 28 - 91 0 0 48 14 13 23 53 28 26 198 -14 47 0 34 49 30 51 45 19 4 51 27 21 - 92 0 0 48 5 48 23 53 25 26 197 -13 46 52 16 49 22 17 45 10 55 51 18 34 - 93 0 0 47 57 42 23 53 22 27 196 -12 46 44 17 49 14 4 45 3 5 51 10 7 - 94 0 0 47 49 56 23 53 19 27 195 -12 46 36 38 49 6 11 44 55 34 51 2 2 - 95 0 0 47 42 31 23 53 16 27 194 -11 46 29 19 48 58 39 44 48 23 50 54 18 - 96 0 0 47 35 27 23 53 13 28 193 -10 46 22 21 48 51 27 44 41 32 50 46 55 - 97 0 0 47 28 43 23 53 10 28 192 -9 46 15 42 48 44 37 44 35 0 50 39 54 - 98 0 0 47 22 20 23 53 7 28 191 -9 46 9 25 48 38 8 44 28 50 50 33 14 - 99 0 0 47 16 18 23 53 4 28 190 -8 46 3 28 48 32 0 44 22 59 50 26 57 -100 0 0 47 10 37 23 53 1 28 188 -7 45 57 52 48 26 14 44 17 29 50 21 1 -101 0 0 47 5 17 23 52 58 29 187 -7 45 52 37 48 20 49 44 12 20 50 15 28 -102 0 0 47 0 20 23 52 55 29 186 -6 45 47 43 48 15 47 44 7 32 50 10 17 -103 0 0 46 55 43 23 52 52 29 185 -5 45 43 11 48 11 6 44 3 5 50 5 29 -104 0 0 46 51 29 23 52 48 29 184 -5 45 39 1 48 6 48 43 58 59 50 1 4 -105 0 0 46 47 37 23 52 45 29 183 -4 45 35 12 48 2 52 43 55 14 49 57 2 -106 0 0 46 44 6 23 52 42 29 182 -3 45 31 44 47 59 18 43 51 50 49 53 22 -107 0 0 46 40 58 23 52 39 29 181 -3 45 28 39 47 56 7 43 48 48 49 50 6 -108 0 0 46 38 12 23 52 36 29 179 -2 45 25 55 47 53 18 43 46 8 49 47 12 -109 0 0 46 35 48 23 52 32 29 178 -1 45 23 33 47 50 52 43 43 49 49 44 42 -110 0 0 46 33 47 23 52 29 29 177 -1 45 21 34 47 48 48 43 41 51 49 42 36 -111 0 0 46 32 8 23 52 26 29 176 0 45 19 56 47 47 8 43 40 15 49 40 52 Uncertainty in time = +/- 6 secs Prediction of 2012 Oct 26.0 Data for the target star ------------------------ * name: UCAC2 26785991 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 20 00 03.2196 DE: -14 11 49.732 * position source: Pos: UCAC2, pm: UCAC2, pi: * standard error: RA,DE ["]: ( .057, .036 ) * V mag [mag]: 11.3 * B mag [mag]: 0.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (69) Hesperia approx. diameter [km]: 133 approx. diameter ["]: .051 distance from Earth [AU]: 3.62200 * orbital information: orbit source: Preston date of fit: 2012 Oct 25 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 1348 number of rejected observations: 166 time covered by the observations: 1912 Jan 19 - 2012 Oct 19 1 sigma uncertainty ellipse (major, minor, PA): 0.008, 0.007, 85° remarks: * orbital elements for (69) Hesperia : Mean anomaly = 207.60061471 deg Arg. of pericenter = 289.73965245 deg Long. of node = 185.04464158 deg Inclination = 8.58429759 deg Eccentricity = 0.16977596 Semimajor axis = 2.97652833 AU Perihelion dist = 2.47118537 AU Mag: H = 7.11, G = 0.19 Epoch of elements : MJD 56240.99500000 TDT (2012 Nov 09.995) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 9 69 Hesperia 23h 52.5m UT 11.3 20 0 3.220-14 11 49.73UCAC2 26785991 0.0 13.3 133 5.5 3.622 2.278 1.07 -107.6678 -14.197 177.85 -17.19 23.8753 -0.02336 0.86914 13.64333 0.43909 0.00555 0.00135 2000 207.409646201211 9.00000289.739652185.044642 8.5842980.16977596 2.9765283 2.4711854 7.1 5.00.19 RATE 1.9192830 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.058 0.037 90 1.72 0.036 0 0-4-2 056226.0020121109_785991 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 25, 22:05 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org