IOTA/IOTA-ES occultation update for (2911) Miahelena / TYC 6315-01323-1 event on 2009 Sep 01, 21:50 UT Visible from Summary ------- On 2009 Sep 01 UT, the 18 km diameter asteroid (2911) Miahelena will occult a 10.1 mag star in the constellation Capricornus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.6 mag to 15.7 mag (the magnitude of the asteroid) for at most 2.6 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: 13 * date and approx. time of event: 2009 Sep 01, 21:36 - 2009 Sep 01, 22:01 UT * magnitude of target star: 10.1 * magnitude drop [mag]: 5.6 * estimated maximum duration [s]: 2.6 * Moon: 93 % sunlit, 8° distance * Sun: 143° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 19 * 1 sigma uncertainty interval [path widths]: +/- 4.99 * 1 sigma uncertainty interval [seconds]: +/- 13.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .074 +/- .057) * 1 sigma uncertainty ellipse (major, minor, PA): ( .074", .057", 86° ) * approx speed of asteroid's shadow [km/s]: 7.0158 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6315-01323-1 by 2911 Miahelena on 2009 Sep 1 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 60 40 40 58 0 0 21 36 3 0 238 -21 60 22 34 60 58 52 57 26 56 ... .. .. 57 48 8 57 0 0 21 36 4 2 236 -23 57 31 21 58 4 58 54 47 49 ... .. .. Latitude Latitude Latitude Latitude 56 0 0 56 19 21 21 36 5 3 234 -24 56 25 34 56 13 8 57 27 53 55 11 19 55 0 0 55 55 43 21 36 5 4 233 -24 56 1 59 55 49 28 57 4 47 54 47 11 54 0 0 55 31 19 21 36 6 5 233 -25 55 37 38 55 25 1 56 40 55 54 22 15 53 0 0 55 6 7 21 36 7 5 232 -25 55 12 29 54 59 46 56 16 16 53 56 31 52 0 0 54 40 6 21 36 8 6 231 -26 54 46 31 54 33 42 55 50 48 53 29 58 51 0 0 54 13 15 21 36 10 7 230 -27 54 19 43 54 6 48 55 24 31 53 2 34 50 0 0 53 45 33 21 36 11 8 229 -27 53 52 4 53 39 3 54 57 23 52 34 19 49 0 0 53 16 59 21 36 13 8 228 -28 53 23 33 53 10 25 54 29 23 52 5 12 48 0 0 52 47 31 21 36 15 9 228 -28 52 54 9 52 40 55 54 0 29 51 35 11 47 0 0 52 17 10 21 36 17 10 227 -29 52 23 50 52 10 30 53 30 42 51 4 15 46 0 0 51 45 52 21 36 19 11 226 -30 51 52 36 51 39 9 53 0 0 50 32 25 45 0 0 51 13 39 21 36 22 11 225 -30 51 20 25 51 6 53 52 28 21 49 59 37 44 0 0 50 40 28 21 36 25 12 225 -31 50 47 18 50 33 39 51 55 45 49 25 53 43 0 0 50 6 19 21 36 28 13 224 -32 50 13 12 49 59 27 51 22 11 48 51 11 42 0 0 49 31 12 21 36 31 14 223 -32 49 38 7 49 24 16 50 47 38 48 15 29 41 0 0 48 55 4 21 36 35 15 222 -33 49 2 3 48 48 5 50 12 4 47 38 49 40 0 0 48 17 56 21 36 39 16 221 -34 48 24 57 48 10 54 49 35 30 47 1 8 39 0 0 47 39 46 21 36 43 17 221 -34 47 46 51 47 32 42 48 57 54 46 22 26 38 0 0 47 0 35 21 36 47 18 220 -35 47 7 43 46 53 27 48 19 16 45 42 43 37 0 0 46 20 22 21 36 52 19 219 -36 46 27 32 46 13 11 47 39 35 45 1 58 36 0 0 45 39 6 21 36 57 20 218 -36 45 46 19 45 31 52 46 58 50 44 20 12 35 0 0 44 56 47 21 37 3 21 218 -37 45 4 3 44 49 31 46 17 3 43 37 23 34 0 0 44 13 25 21 37 9 22 217 -38 44 20 44 44 6 6 45 34 11 42 53 33 33 0 0 43 29 0 21 37 15 23 216 -39 43 36 22 43 21 39 44 50 15 42 8 40 32 0 0 42 43 33 21 37 22 24 216 -39 42 50 57 42 36 9 44 5 16 41 22 46 31 0 0 41 57 3 21 37 29 25 215 -40 42 4 30 41 49 37 43 19 13 40 35 51 30 0 0 41 9 31 21 37 37 26 214 -41 41 17 0 41 2 3 42 32 7 39 47 54 29 0 0 40 20 58 21 37 45 27 213 -41 40 28 29 40 13 28 41 43 58 38 58 58 28 0 0 39 31 25 21 37 53 28 213 -42 39 38 58 39 23 52 40 54 47 38 9 3 27 0 0 38 40 52 21 38 2 29 212 -43 38 48 27 38 33 18 40 4 35 37 18 10 26 0 0 37 49 21 21 38 11 30 211 -43 37 56 57 37 41 45 39 13 23 36 26 20 25 0 0 36 56 52 21 38 21 31 211 -44 37 4 31 36 49 15 38 21 13 35 33 35 24 0 0 36 3 29 21 38 31 32 210 -45 36 11 8 35 55 50 37 28 5 34 39 56 23 0 0 35 9 12 21 38 42 34 209 -45 35 16 53 35 1 31 36 34 2 33 45 25 22 0 0 34 14 3 21 38 53 35 208 -46 34 21 45 34 6 21 35 39 6 32 50 4 21 0 0 33 18 4 21 39 5 36 208 -47 33 25 47 33 10 22 34 43 18 31 53 56 20 0 0 32 21 18 21 39 17 37 207 -47 32 29 2 32 13 35 33 46 40 30 57 2 19 0 0 31 23 47 21 39 29 38 206 -48 31 31 31 31 16 3 32 49 16 29 59 24 18 0 0 30 25 34 21 39 43 40 206 -48 30 33 19 30 17 50 31 51 7 29 1 7 17 0 0 29 26 41 21 39 56 41 205 -49 29 34 26 29 18 57 30 52 17 28 2 11 16 0 0 28 27 11 21 40 10 42 204 -49 28 34 56 28 19 27 29 52 47 27 2 41 15 0 0 27 27 7 21 40 25 43 203 -50 27 34 52 27 19 23 28 52 42 26 2 38 14 0 0 26 26 33 21 40 40 45 203 -50 26 34 18 26 18 49 27 52 5 25 2 7 13 0 0 25 25 31 21 40 55 46 202 -51 25 33 15 25 17 48 26 50 58 24 1 10 12 0 0 24 24 5 21 41 11 47 201 -51 24 31 48 24 16 22 25 49 25 22 59 50 11 0 0 23 22 17 21 41 27 48 200 -51 23 30 0 23 14 35 24 47 28 21 58 11 10 0 0 22 20 12 21 41 44 50 199 -51 22 27 54 22 12 31 23 45 13 20 56 16 9 0 0 21 17 53 21 42 1 51 198 -52 21 25 34 21 10 13 22 42 41 19 54 8 8 0 0 20 15 22 21 42 19 52 197 -52 20 23 2 20 7 43 21 39 57 18 51 50 7 0 0 19 12 45 21 42 37 53 196 -52 19 20 23 19 5 7 20 37 4 17 49 27 6 0 0 18 10 2 21 42 55 55 195 -52 18 17 39 18 2 26 19 34 5 16 47 0 5 0 0 17 7 19 21 43 13 56 194 -52 17 14 54 16 59 45 18 31 4 15 44 35 4 0 0 16 4 39 21 43 32 57 193 -52 16 12 12 15 57 6 17 28 5 14 42 12 3 0 0 15 2 4 21 43 51 58 192 -52 15 9 35 14 54 33 16 25 9 13 39 57 2 0 0 13 59 38 21 44 11 59 190 -51 14 7 7 13 52 9 15 22 21 12 37 52 1 0 0 12 57 24 21 44 30 61 189 -51 13 4 51 12 49 57 14 19 45 11 35 59 0 0 0 11 55 24 21 44 50 62 187 -51 12 2 50 11 47 59 13 17 22 10 34 22 - 1 0 0 10 53 43 21 45 10 63 186 -51 11 1 6 10 46 20 12 15 16 9 33 4 - 2 0 0 9 52 22 21 45 30 64 184 -50 9 59 43 9 45 2 11 13 30 8 32 8 - 3 0 0 8 51 25 21 45 50 65 182 -50 8 58 44 8 44 7 10 12 7 7 31 35 - 4 0 0 7 50 54 21 46 11 66 180 -49 7 58 10 7 43 38 9 11 8 6 31 29 - 5 0 0 6 50 51 21 46 31 67 177 -49 6 58 4 6 43 37 8 10 38 5 31 53 - 6 0 0 5 51 18 21 46 52 68 175 -48 5 58 30 5 44 7 7 10 38 4 32 47 - 7 0 0 4 52 19 21 47 12 69 172 -48 4 59 28 4 45 11 6 11 11 3 34 15 - 8 0 0 3 53 55 21 47 33 70 170 -47 4 1 1 3 46 49 5 12 18 2 36 18 - 9 0 0 2 56 8 21 47 53 70 167 -47 3 3 12 2 49 4 4 14 2 1 38 59 - 10 0 0 1 59 0 21 48 14 71 163 -46 2 6 1 1 51 59 3 16 25 0 42 19 - 11 0 0 1 2 32 21 48 34 72 160 -45 1 9 31 0 55 34 2 19 28 - 0 13 40 - 12 0 0 0 6 47 21 48 55 72 156 -45 0 13 43 - 0 0 9 1 23 13 - 1 8 57 - 13 0 0 - 0 48 15 21 49 15 73 152 -44 - 0 41 21 - 0 55 7 0 27 42 - 2 3 30 - 14 0 0 - 1 42 31 21 49 35 73 148 -43 - 1 35 40 - 1 49 21 - 0 27 4 - 2 57 18 - 15 0 0 - 2 36 1 21 49 56 73 144 -42 - 2 29 13 - 2 42 48 - 1 21 4 - 3 50 19 - 16 0 0 - 3 28 43 21 50 16 73 140 -42 - 3 21 58 - 3 35 28 - 2 14 16 - 4 42 32 - 17 0 0 - 4 20 37 21 50 36 73 136 -41 - 4 13 54 - 4 27 19 - 3 6 39 - 5 33 57 - 18 0 0 - 5 11 41 21 50 55 73 132 -40 - 5 5 1 - 5 18 21 - 3 58 13 - 6 24 33 - 19 0 0 - 6 1 55 21 51 15 73 128 -39 - 5 55 18 - 6 8 32 - 4 48 57 - 7 14 18 - 20 0 0 - 6 51 17 21 51 34 73 124 -38 - 6 44 43 - 6 57 52 - 5 38 49 - 8 3 12 - 21 0 0 - 7 39 48 21 51 54 72 121 -38 - 7 33 16 - 7 46 20 - 6 27 49 - 8 51 15 - 22 0 0 - 8 27 27 21 52 13 72 117 -37 - 8 20 58 - 8 33 56 - 7 15 56 - 9 38 25 - 23 0 0 - 9 14 13 21 52 31 72 114 -36 - 9 7 46 - 9 20 40 - 8 3 11 -10 24 43 - 24 0 0 -10 0 6 21 52 50 71 111 -35 - 9 53 42 -10 6 30 - 8 49 32 -11 10 8 - 25 0 0 -10 45 5 21 53 8 70 108 -34 -10 38 43 -10 51 27 - 9 35 0 -11 54 40 - 26 0 0 -11 29 11 21 53 27 70 106 -33 -11 22 52 -11 35 30 -10 19 33 -12 38 18 - 27 0 0 -12 12 23 21 53 44 69 104 -32 -12 6 6 -12 18 39 -11 3 13 -13 21 3 - 28 0 0 -12 54 40 21 54 2 68 102 -31 -12 48 26 -13 0 54 -11 45 58 -14 2 54 - 29 0 0 -13 36 4 21 54 19 68 100 -31 -13 29 52 -13 42 16 -12 27 48 -14 43 52 - 30 0 0 -14 16 34 21 54 37 67 98 -30 -14 10 24 -14 22 43 -13 8 45 -15 23 55 - 31 0 0 -14 56 9 21 54 54 66 97 -29 -14 50 2 -15 2 16 -13 48 47 -16 3 6 - 32 0 0 -15 34 51 21 55 10 65 95 -28 -15 28 47 -15 40 56 -14 27 54 -16 41 22 - 33 0 0 -16 12 39 21 55 27 64 94 -27 -16 6 37 -16 18 42 -15 6 8 -17 18 45 - 34 0 0 -16 49 34 21 55 43 63 93 -26 -16 43 34 -16 55 34 -15 43 27 -17 55 16 - 35 0 0 -17 25 35 21 55 58 63 92 -25 -17 19 37 -17 31 33 -16 19 53 -18 30 53 - 36 0 0 -18 0 44 21 56 14 62 91 -24 -17 54 48 -18 6 39 -16 55 26 -19 5 38 - 37 0 0 -18 34 59 21 56 29 61 90 -23 -18 29 6 -18 40 53 -17 30 5 -19 39 30 - 38 0 0 -19 8 22 21 56 44 60 90 -23 -19 2 31 -19 14 14 -18 3 51 -20 12 30 - 39 0 0 -19 40 53 21 56 59 59 89 -22 -19 35 4 -19 46 43 -18 36 45 -20 44 39 - 40 0 0 -20 12 33 21 57 14 58 89 -21 -20 6 45 -20 18 20 -19 8 46 -21 15 56 - 41 0 0 -20 43 20 21 57 28 57 88 -20 -20 37 35 -20 49 6 -19 39 56 -21 46 23 - 42 0 0 -21 13 17 21 57 42 56 88 -19 -21 7 34 -21 19 1 -20 10 14 -22 15 59 - 43 0 0 -21 42 24 21 57 56 55 87 -18 -21 36 42 -21 48 5 -20 39 42 -22 44 44 - 44 0 0 -22 10 40 21 58 9 54 87 -17 -22 5 0 -22 16 20 -21 8 18 -23 12 41 - 45 0 0 -22 38 6 21 58 22 54 87 -17 -22 32 28 -22 43 44 -21 36 4 -23 39 48 - 46 0 0 -23 4 44 21 58 35 53 87 -16 -22 59 7 -23 10 20 -22 3 1 -24 6 6 - 47 0 0 -23 30 32 21 58 48 52 87 -15 -23 24 57 -23 36 6 -22 29 8 -24 31 36 - 48 0 0 -23 55 32 21 59 1 51 87 -14 -23 49 59 -24 1 5 -22 54 26 -24 56 17 - 49 0 0 -24 19 44 21 59 13 50 87 -13 -24 14 12 -24 25 15 -23 18 56 -25 20 12 - 50 0 0 -24 43 8 21 59 25 49 87 -12 -24 37 38 -24 48 38 -23 42 38 -25 43 19 - 51 0 0 -25 5 46 21 59 36 48 87 -11 -25 0 17 -25 11 14 -24 5 32 -26 5 40 - 52 0 0 -25 27 36 21 59 48 47 87 -11 -25 22 9 -25 33 3 -24 27 39 -26 27 15 - 53 0 0 -25 48 41 21 59 59 46 87 -10 -25 43 15 -25 54 6 -24 48 59 -26 48 3 - 54 0 0 -26 8 59 22 0 10 46 87 -9 -26 3 35 -26 14 23 -25 9 33 -27 8 7 - 55 0 0 -26 28 32 22 0 21 45 87 -8 -26 23 10 -26 33 55 -25 29 21 -27 27 26 - 56 0 0 -26 47 21 22 0 31 44 87 -7 -26 41 59 -26 52 42 -25 48 23 -27 46 0 - 57 0 0 -27 5 24 22 0 42 43 87 -6 -27 0 4 -27 10 44 -26 6 40 -28 3 50 - 58 0 0 -27 22 44 22 0 52 42 88 -6 -27 17 25 -27 28 2 -26 24 13 -28 20 56 - 59 0 0 -27 39 19 22 1 2 41 88 -5 -27 34 1 -27 44 37 -26 41 1 -28 37 19 - 60 0 0 -27 55 11 22 1 11 40 88 -4 -27 49 54 -28 0 28 -26 57 5 -28 53 0 - 61 0 0 -28 10 20 22 1 21 40 88 -3 -28 5 4 -28 15 36 -27 12 26 -29 7 57 - 62 0 0 -28 24 46 22 1 30 39 89 -2 -28 19 32 -28 30 1 -27 27 3 -29 22 12 - 63 0 0 -28 38 30 22 1 39 38 89 -2 -28 33 16 -28 43 44 -27 40 57 -29 35 46 - 64 0 0 -28 51 31 22 1 48 37 89 -1 -28 46 19 -28 56 44 -27 54 9 -29 48 37 Uncertainty in time = +/- 15 secs [Prediction of 2008 Apr 25.0] Data for the target star ------------------------ * name: TYC 6315-01323-1 * constellation : Capricornus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 20 14 48.0506 DE: -16 12 34.808 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .025, .029 ) * V mag [mag]: 10.1 * B mag [mag]: 10.8 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2911) Miahelena approx. diameter [km]: 18 approx. diameter ["]: .013 distance from Earth [AU]: 1.95000 * orbital information: orbit source: Preston date of fit: 2008 Apr 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 704 number of rejected observations: 19 time covered by the observations: 1938 Apr 07 - 2008 Mar 13 1 sigma uncertainty ellipse (major, minor, PA): 0.070, 0.049, 86° remarks: * orbital elements for (2911) Miahelena : Mean anomaly = 89.50821320 deg Arg. of pericenter = 65.04635455 deg Long. of node = 149.34897381 deg Inclination = 9.62274127 deg Eccentricity = 0.09352180 Semimajor axis = 2.79759211 AU Perihelion dist = 2.53595626 AU Mag: H = 11.45, G = 0.15 Epoch of elements : MJD 55075.91000000 TDT (2009 Sep 01.910) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Sep 1 2911 Miahelena 21h 50.5m UT 10.1 20 14 48.051-16 12 34.81TYC 6315-01323-1 10.8 15.7 18 2.6 1.950 -0.872 -12.66 -5.1207 -16.206 -147.67 7.97 21.8421 -0.20432 0.20267 -2.79083 -2.80928 0.00339 0.00048 2000 88.2633692009 827.00000 65.046355149.348974 9.6227410.09352180 2.7975921 2.535956311.3 5.00.15 RATE 2.1063350 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.074 0.057 86 5.99 0.063 0 54581.5020090901_1323-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 25, 08:19 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org