IOTA/IOTA-ES occultation update for (773) Irmintraud / TYC 7894-00392-1 event on 2008 Apr 03, 00:18 UT Visible from Madagascar, Africa Summary ------- On 2008 Apr 03 UT, the 96 km diameter asteroid (773) Irmintraud will occult a 12.3 mag star in the constellation Corona Australis for observers along a path across Madagascar, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.0 mag to 14.1 mag (the magnitude of the asteroid) for at most 7.7 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: 76 * date and approx. time of event: 2008 Apr 03, 00:10 - 2008 Apr 03, 00:20 UT * midpoint of event [JD]: 2454559.51337083 * magnitude of target star: 12.3 * magnitude drop [mag]: 2.0 * estimated maximum duration [s]: 7.7 * Moon: 12 % sunlit, 64° distance * Sun: 103° distance * rough path description: Madagascar, Africa The occultation path -------------------- * approximate projected width [km]: 96 * 1 sigma uncertainty interval [path widths]: +/- 0.73 * 1 sigma uncertainty interval [seconds]: +/- 4.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .038 +/- .043) * 1 sigma uncertainty ellipse (major, minor, PA): ( .043", .038", 359° ) * approx speed of asteroid's shadow [km/s]: 12.3782 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7894-00392-1 by 773 Irmintraud on 2008 Apr 3 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 10 42 48 24 0 0 0 10 42 1 138 -58 10 4 36 11 20 53 ... .. .. 12 16 17 11 40 52 23 0 0 0 10 43 2 139 -59 11 3 8 12 18 30 10 7 50 13 13 16 12 37 57 22 0 0 0 10 43 3 139 -59 12 0 39 13 15 10 11 5 59 14 9 21 13 34 8 21 0 0 0 10 44 5 139 -60 12 57 13 14 10 58 12 3 10 15 4 35 14 29 29 20 0 0 0 10 45 6 140 -60 13 52 56 15 5 57 12 59 25 15 59 4 15 24 3 19 0 0 0 10 47 7 140 -60 14 47 51 16 0 11 13 54 51 16 52 50 16 17 55 18 0 0 0 10 48 9 140 -61 15 42 1 16 53 45 14 49 30 17 45 57 17 11 8 17 0 0 0 10 50 10 140 -61 16 35 32 17 46 41 15 43 26 18 38 29 18 3 45 16 0 0 0 10 52 11 141 -61 17 28 25 18 39 2 16 36 44 19 30 28 18 55 51 15 0 0 0 10 55 13 141 -61 18 20 45 19 30 54 17 29 26 20 21 59 19 47 27 14 0 0 0 10 57 14 141 -61 19 12 35 20 22 17 18 21 36 21 13 4 20 38 37 13 0 0 0 11 0 15 141 -61 20 3 57 21 13 15 19 13 16 22 3 46 21 29 25 12 0 0 0 11 4 17 142 -61 20 54 55 22 3 52 20 4 31 22 54 8 22 19 51 11 0 0 0 11 7 18 142 -61 21 45 32 22 54 10 20 55 22 23 44 13 23 10 1 10 0 0 0 11 11 19 142 -61 22 35 50 23 44 11 21 45 53 24 34 3 23 59 56 9 0 0 0 11 15 20 142 -60 23 25 52 24 33 59 22 36 6 25 23 41 24 49 38 8 0 0 0 11 19 22 142 -60 24 15 40 25 23 35 23 26 5 26 13 9 25 39 11 7 0 0 0 11 23 23 142 -60 25 5 18 26 13 3 24 15 51 27 2 30 26 28 36 6 0 0 0 11 28 24 142 -59 25 54 48 27 2 25 25 5 27 27 51 47 27 17 58 5 0 0 0 11 33 26 143 -59 26 44 13 27 51 43 25 54 56 28 41 2 28 7 17 4 0 0 0 11 38 27 143 -58 27 33 34 28 41 1 26 44 21 29 30 18 28 56 37 3 0 0 0 11 44 28 143 -58 28 22 55 29 30 20 27 33 44 30 19 37 29 46 0 2 0 0 0 11 49 30 143 -57 29 12 17 30 19 44 28 23 7 31 9 2 30 35 29 1 0 0 0 11 55 31 143 -57 30 1 45 31 9 14 29 12 33 31 58 35 31 25 6 0 0 0 0 12 1 32 143 -56 30 51 19 31 58 54 30 2 4 32 48 19 32 14 53 - 1 0 0 0 12 8 33 143 -55 31 41 4 32 48 46 30 51 44 33 38 17 Latitude Latitude Latitude Latitude 33 0 0 - 1 54 7 0 12 14 35 143 -55 - 2 34 42 - 1 13 29 - 3 33 50 - 0 14 3 34 0 0 - 3 5 42 0 12 22 36 143 -54 - 3 46 8 - 2 25 13 - 4 45 3 - 1 25 59 35 0 0 - 4 16 44 0 12 31 38 143 -53 - 4 57 0 - 3 36 24 - 5 55 42 - 2 37 24 36 0 0 - 5 27 9 0 12 39 39 143 -52 - 6 7 14 - 4 47 0 - 7 5 40 - 3 48 15 37 0 0 - 6 36 51 0 12 48 41 143 -51 - 7 16 45 - 5 56 54 - 8 14 54 - 4 58 26 38 0 0 - 7 45 47 0 12 58 42 143 -50 - 8 25 28 - 7 6 2 - 9 23 19 - 6 7 53 39 0 0 - 8 53 53 0 13 7 44 143 -49 - 9 33 21 - 8 14 21 -10 30 52 - 7 16 32 40 0 0 -10 1 4 0 13 17 45 143 -48 -10 40 17 - 9 21 46 -11 37 28 - 8 24 17 41 0 0 -11 7 17 0 13 27 47 143 -47 -11 46 16 -10 28 14 -12 43 5 - 9 31 7 42 0 0 -12 12 29 0 13 36 48 143 -45 -12 51 12 -11 33 41 -13 47 38 -10 36 57 43 0 0 -13 16 36 0 13 47 50 143 -44 -13 55 3 -12 38 5 -14 51 6 -11 41 44 44 0 0 -14 19 37 0 13 57 51 143 -43 -14 57 48 -13 41 23 -15 53 26 -12 45 26 45 0 0 -15 21 29 0 14 7 53 143 -42 -15 59 22 -14 43 32 -16 54 36 -13 48 0 46 0 0 -16 22 9 0 14 17 54 143 -41 -16 59 46 -15 44 30 -17 54 34 -14 49 24 47 0 0 -17 21 37 0 14 28 55 143 -40 -17 58 56 -16 44 15 -18 53 18 -15 49 36 48 0 0 -18 19 51 0 14 38 57 143 -39 -18 56 51 -17 42 47 -19 50 47 -16 48 34 49 0 0 -19 16 49 0 14 48 58 143 -38 -19 53 31 -18 40 4 -20 47 1 -17 46 17 50 0 0 -20 12 31 0 14 59 60 143 -37 -20 48 55 -19 36 4 -21 41 57 -18 42 45 51 0 0 -21 6 56 0 15 9 61 143 -35 -21 43 1 -20 30 48 -22 35 37 -19 37 56 52 0 0 -22 0 4 0 15 20 62 143 -34 -22 35 50 -21 24 14 -23 27 59 -20 31 49 53 0 0 -22 51 54 0 15 30 63 143 -33 -23 27 22 -22 16 23 -24 19 3 -21 24 25 54 0 0 -23 42 26 0 15 40 65 143 -32 -24 17 35 -23 7 14 -25 8 50 -22 15 43 55 0 0 -24 31 41 0 15 51 66 143 -31 -25 6 32 -23 56 47 -25 57 19 -23 5 44 56 0 0 -25 19 39 0 16 1 67 144 -30 -25 54 11 -24 45 3 -26 44 32 -23 54 27 57 0 0 -26 6 20 0 16 11 68 144 -29 -26 40 34 -25 32 3 -27 30 28 -24 41 53 58 0 0 -26 51 45 0 16 21 69 144 -28 -27 25 41 -26 17 45 -28 15 9 -25 28 3 59 0 0 -27 35 54 0 16 31 70 145 -27 -28 9 32 -27 2 13 -28 58 35 -26 12 56 60 0 0 -28 18 49 0 16 41 72 145 -26 -28 52 10 -27 45 25 -29 40 46 -26 56 35 61 0 0 -29 0 30 0 16 51 73 146 -25 -29 33 33 -28 27 24 -30 21 44 -27 38 59 62 0 0 -29 40 58 0 17 1 74 147 -24 -30 13 44 -29 8 9 -31 1 31 -28 20 9 63 0 0 -30 20 14 0 17 11 75 148 -23 -30 52 44 -29 47 42 -31 40 6 -29 0 7 64 0 0 -30 58 20 0 17 20 76 149 -22 -31 30 33 -30 26 4 -32 17 31 -29 38 53 65 0 0 -31 35 16 0 17 30 77 150 -21 -32 7 13 -31 3 17 -32 53 48 -30 16 29 66 0 0 -32 11 4 0 17 39 78 152 -20 -32 42 45 -31 39 20 -33 28 56 -30 52 56 67 0 0 -32 45 44 0 17 48 78 154 -19 -33 17 10 -32 14 16 -34 2 59 -31 28 15 68 0 0 -33 19 18 0 17 58 79 156 -18 -33 50 29 -32 48 5 -34 35 56 -32 2 26 69 0 0 -33 51 47 0 18 7 80 159 -17 -34 22 43 -33 20 49 -35 7 49 -32 35 32 70 0 0 -34 23 13 0 18 16 81 162 -16 -34 53 54 -33 52 29 -35 38 39 -33 7 33 71 0 0 -34 53 35 0 18 25 81 166 -16 -35 24 3 -34 23 6 -36 8 27 -33 38 30 72 0 0 -35 22 57 0 18 33 82 171 -15 -35 53 11 -34 52 41 -36 37 15 -34 8 26 73 0 0 -35 51 18 0 18 42 83 177 -14 -36 21 19 -35 21 16 -37 5 4 -34 37 20 74 0 0 -36 18 40 0 18 51 83 183 -13 -36 48 28 -35 48 51 -37 31 54 -35 5 14 75 0 0 -36 45 5 0 18 59 83 191 -12 -37 14 40 -36 15 28 -37 57 48 -35 32 9 76 0 0 -37 10 32 0 19 7 83 199 -11 -37 39 55 -36 41 7 -38 22 46 -35 58 7 77 0 0 -37 35 4 0 19 16 84 207 -10 -38 4 16 -37 5 51 -38 46 49 -36 23 8 78 0 0 -37 58 42 0 19 24 83 215 -10 -38 27 42 -37 29 40 -39 9 59 -36 47 13 79 0 0 -38 21 26 0 19 32 83 223 -9 -38 50 14 -37 52 35 -39 32 16 -37 10 24 80 0 0 -38 43 17 0 19 40 83 230 -8 -39 11 55 -38 14 37 -39 53 41 -37 32 42 81 0 0 -39 4 17 0 19 48 83 236 -7 -39 32 45 -38 35 47 -40 14 16 -37 54 7 82 0 0 -39 24 26 0 19 56 82 241 -6 -39 52 44 -38 56 6 -40 34 1 -38 14 41 83 0 0 -39 43 46 0 20 3 81 245 -6 -40 11 54 -39 15 35 -40 52 57 -38 34 24 84 0 0 -40 2 17 0 20 11 81 248 -5 -40 30 16 -39 34 16 -41 11 6 -38 53 18 85 0 0 -40 20 0 0 20 18 80 251 -4 -40 47 51 -39 52 7 -41 28 27 -39 11 22 86 0 0 -40 36 56 0 20 26 80 254 -3 -41 4 38 -40 9 12 -41 45 3 -39 28 39 87 0 0 -40 53 6 0 20 33 79 255 -3 -41 20 40 -40 25 30 -42 0 53 -39 45 9 88 0 0 -41 8 30 0 20 40 78 257 -2 -41 35 57 -40 41 2 -42 15 59 -40 0 53 89 0 0 -41 23 10 0 20 48 78 258 -1 -41 50 29 -40 55 49 -42 30 20 -40 15 51 90 0 0 -41 37 6 0 20 55 77 259 0 -42 4 18 -41 9 52 -42 43 59 -40 30 4 Uncertainty in time = +/- 6 secs [Prediction of 2008 Feb 4.0] Data for the target star ------------------------ * name: TYC 7894-00392-1 * constellation : Corona Australis * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 59 06.6126 DE: -42 31 20.148 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .022, .041 ) * V mag [mag]: 12.3 * B mag [mag]: 13.0 * Apparent position with proper motion RA(deg): 269.9304296595 DE(deg): -42.5228290855 * Equation of equinoxes (radians) : 0.000041135677751 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (773) Irmintraud approx. diameter [km]: 96 approx. diameter ["]: .058 distance from Earth [AU]: 2.28900 * orbital information: orbit source: Preston date of fit: 2008 Feb 03 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 664 number of rejected observations: 62 time covered by the observations: 1914 Jan 15 - 2007 Jul 05 1 sigma uncertainty ellipse (major, minor, PA): 0.031, 0.015, 78° remarks: * orbital elements for (773) Irmintraud : Mean anomaly = 317.48923381 deg Arg. of pericenter = 334.09130911 deg Long. of node = 322.45609418 deg Inclination = 16.68235021 deg Eccentricity = 0.08222537 Semimajor axis = 2.85770872 AU Perihelion dist = 2.62273257 AU Mag: H = 9.02, G = 0.15 Epoch of elements : MJD 54559.01300000 TDT (2008 Apr 03.013) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Apr 3 773 Irmintraud 0h 19.3m UT 12.3 17 59 6.613-42 31 20.15TYC 7894-00392-1 13.0 14.1 96 7.7 2.289 2.137 -12.74 73.2542 -42.519 176.02 5.38 0.3209 0.04902 0.08854 6.15076 -3.31376 -0.00559 0.00045 2000 315.6503832008 325.00000334.091309322.456094 16.6823500.08222537 2.8577087 2.6227326 9.1 5.00.15 RATE 2.0402210 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.043 0.038 359 1.73 0.042 0 54500.5020080403_0392-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 07, 13:30 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org