IOTA/IOTA-ES occultation update for (773) Irmintraud / TYC 7887-02149-1 event on 2008 Mar 06, 05:23 UT Visible from Argentina, Chile Summary ------- On 2008 Mar 06 UT, the 96 km diameter asteroid (773) Irmintraud will occult a 9.3 mag star in the constellation Scorpius for observers along a path across Argentina, Chile. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.1 mag to 14.4 mag (the magnitude of the asteroid) for at most 4.2 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: 94 * date and approx. time of event: 2008 Mar 06, 05:20 - 2008 Mar 06, 05:24 UT * midpoint of event [JD]: 2454531.72482083 * magnitude of target star: 9.3 * magnitude drop [mag]: 5.1 * estimated maximum duration [s]: 4.2 * Moon: 3 % sunlit, 64° distance * Sun: 83° distance * rough path description: Argentina, Chile The occultation path -------------------- * approximate projected width [km]: 135 * 1 sigma uncertainty interval [path widths]: +/- 0.46 * 1 sigma uncertainty interval [seconds]: +/- 2.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .032 +/- .022) * 1 sigma uncertainty ellipse (major, minor, PA): ( .032", .022", 86° ) * approx speed of asteroid's shadow [km/s]: 22.5861 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7887-02149-1 by 773 Irmintraud on 2008 Mar 6 Centre Star Star Sun Path Limit1 Path Limit2 Error Limit1 Error Limit2 E. Longitude Latitude U.T. Alt Az Alt o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " o ' " o ' " o ' " o ' " Longitude Latitude Longitude Latitude Longitude Latitude Longitude Latitude - 85 37 21 -24 23 31 5 20 26 6 132 -59 - 83 26 5 -25 43 17 - 89 20 17 -21 40 58 - 81 47 14 -26 36 34 ... .. .. .. .. .. - 82 5 42 -28 7 14 5 20 31 11 130 -56 - 80 33 18 -28 50 59 - 83 49 30 -27 12 47 - 79 15 9 -29 24 43 - 85 42 3 -26 6 52 - 79 45 33 -30 46 10 5 20 36 14 128 -54 - 78 25 59 -31 17 18 - 81 10 31 -30 9 48 - 77 16 35 -31 42 14 - 82 35 3 -29 30 13 - 77 53 48 -32 59 1 5 20 41 17 127 -52 - 76 40 52 -33 23 10 - 79 10 11 -32 31 28 - 75 36 19 -33 42 49 - 80 24 8 -32 2 28 - 76 18 25 -34 56 41 5 20 46 19 126 -50 - 75 9 27 -35 16 14 - 77 29 52 -34 34 36 - 74 7 56 -35 32 16 - 78 38 10 -34 11 42 - 74 53 55 -36 44 8 5 20 51 21 125 -48 - 73 47 30 -37 0 21 - 76 2 17 -36 25 52 - 72 47 58 -37 13 41 - 77 7 8 -36 7 4 - 73 37 18 -38 24 5 5 20 56 23 124 -46 - 72 32 35 -38 37 46 - 74 43 38 -38 8 42 - 71 34 22 -38 48 58 - 75 46 16 -37 52 54 - 72 26 41 -39 58 16 5 21 1 24 123 -44 - 71 23 5 -40 9 54 - 73 31 42 -39 45 10 - 70 25 44 -40 19 23 - 74 32 51 -39 31 40 - 71 20 49 -41 27 51 5 21 6 26 122 -43 - 70 17 55 -41 37 47 - 72 24 59 -41 16 35 - 69 21 6 -41 45 50 - 73 25 12 -41 4 58 - 70 18 49 -42 53 39 5 21 12 27 121 -41 - 69 16 17 -43 2 8 - 71 22 29 -42 43 56 - 68 19 44 -43 8 57 - 72 22 8 -42 33 51 - 69 19 59 -44 16 16 5 21 17 29 119 -40 - 68 17 35 -44 23 31 - 70 23 27 -44 7 53 - 67 21 5 -44 29 16 - 71 22 49 -43 59 7 - 68 23 50 -45 36 11 5 21 22 30 118 -38 - 67 21 21 -45 42 21 - 69 27 19 -45 28 58 - 66 24 44 -45 47 8 - 70 26 38 -45 21 21 - 67 29 57 -46 53 47 5 21 27 31 117 -37 - 66 27 12 -46 58 58 - 68 33 39 -46 47 35 - 65 30 19 -47 2 54 - 69 33 7 -46 40 58 - 66 38 0 -48 9 21 5 21 32 32 116 -36 - 65 34 50 -48 13 39 - 67 42 5 -48 4 4 - 64 37 33 -48 16 49 - 68 41 53 -47 58 20 - 65 47 43 -49 23 8 5 21 37 33 115 -34 - 64 44 0 -49 26 39 - 66 52 21 -49 18 42 - 63 46 11 -49 29 6 - 67 52 38 -49 13 46 - 64 58 53 -50 35 20 5 21 42 34 114 -33 - 63 54 28 -50 38 7 - 66 4 12 -50 31 40 - 62 56 0 -50 39 55 - 67 5 5 -50 27 28 - 64 11 17 -51 46 9 5 21 47 35 112 -32 - 63 6 3 -51 48 15 - 65 17 25 -51 43 11 - 62 6 50 -51 49 27 - 66 19 4 -51 39 39 - 63 24 46 -52 55 42 5 21 52 36 111 -30 - 62 18 35 -52 57 10 - 64 31 51 -52 53 24 - 61 18 30 -52 57 48 - 65 34 22 -52 50 28 - 62 39 11 -54 4 9 5 21 57 37 110 -29 - 61 31 55 -54 5 1 - 63 47 20 -54 2 27 - 60 30 51 -54 5 5 - 64 50 51 -54 0 6 - 61 54 22 -55 11 35 5 22 3 38 108 -28 - 60 45 55 -55 11 52 - 63 3 45 -55 10 27 - 59 43 46 -55 11 26 - 64 8 23 -55 8 39 - 61 10 13 -56 18 6 5 22 8 38 107 -27 - 60 0 27 -56 17 51 - 62 20 57 -56 17 31 - 58 57 6 -56 16 55 - 63 26 50 -56 16 14 - 60 26 37 -57 23 48 5 22 13 39 106 -26 - 59 15 23 -57 23 2 - 61 38 49 -57 23 45 - 58 10 43 -57 21 38 - 62 46 6 -57 22 56 - 59 43 27 -58 28 46 5 22 18 40 104 -24 - 58 30 37 -58 27 30 - 60 57 17 -58 29 13 - 57 24 31 -58 25 38 - 62 6 6 -58 28 52 - 59 0 36 -59 33 4 5 22 23 40 103 -23 - 57 46 2 -59 31 19 - 60 16 14 -59 34 0 - 56 38 22 -59 29 0 - 61 26 43 -59 34 5 - 58 18 0 -60 36 46 5 22 28 41 101 -22 - 57 1 31 -60 34 32 - 59 35 34 -60 38 9 - 55 52 9 -60 31 46 - 60 47 53 -60 38 41 - 57 35 30 -61 39 55 5 22 33 41 100 -21 - 56 16 57 -61 37 13 - 58 55 12 -61 41 46 - 55 5 44 -61 34 2 - 60 9 32 -61 42 42 - 56 53 1 -62 42 35 5 22 38 42 98 -20 - 55 32 13 -62 39 26 - 58 15 3 -62 44 53 - 54 18 58 -62 35 48 - 59 31 34 -62 46 13 - 56 10 27 -63 44 49 5 22 43 42 97 -19 - 54 47 10 -63 41 12 - 57 35 1 -63 47 33 - 53 31 45 -63 37 9 - 58 53 56 -63 49 17 - 55 27 39 -64 46 39 5 22 48 43 95 -18 - 54 1 42 -64 42 36 - 56 55 0 -64 49 50 - 52 43 53 -64 38 7 - 58 16 33 -64 51 57 - 54 44 32 -65 48 9 5 22 54 43 94 -17 - 53 15 39 -65 43 39 - 56 14 55 -65 51 46 - 51 55 14 -65 38 44 - 57 39 20 -65 54 15 - 54 0 56 -66 49 21 5 22 59 44 92 -16 - 52 28 51 -66 44 23 - 55 34 39 -66 53 24 - 51 5 36 -66 39 2 - 57 2 14 -66 56 16 - 53 16 43 -67 50 17 5 23 4 44 90 -15 - 51 41 7 -67 44 52 - 54 54 5 -67 54 46 - 50 14 45 -67 39 4 - 56 25 9 -67 58 0 - 52 31 42 -68 51 0 5 23 9 44 89 -14 - 50 52 14 -68 45 6 - 54 13 6 -68 55 54 - 49 22 28 -68 38 52 - 55 48 1 -68 59 32 - 51 45 41 -69 51 31 5 23 14 44 87 -13 - 50 1 57 -69 45 9 - 53 31 33 -69 56 52 - 48 28 27 -69 38 26 - 55 10 44 -70 0 52 - 50 58 27 -70 51 52 5 23 19 45 85 -12 - 49 9 59 -70 45 1 - 52 49 16 -70 57 41 - 47 32 21 -70 37 49 - 54 33 11 -71 2 4 - 50 9 42 -71 52 7 5 23 24 45 83 -11 - 48 15 59 -71 44 44 - 52 6 2 -71 58 23 - 46 33 48 -71 37 2 - 53 55 17 -72 3 9 - 49 19 6 -72 52 15 5 23 29 45 81 -10 - 47 19 33 -72 44 21 - 51 21 38 -72 59 1 - 45 32 16 -72 36 7 - 53 16 52 -73 4 10 - 48 26 16 -73 52 20 5 23 34 45 80 -9 - 46 20 8 -73 43 52 - 50 35 47 -73 59 35 - 44 27 11 -73 35 5 - 52 37 46 -74 5 9 - 47 30 40 -74 52 22 5 23 39 45 78 -8 - 45 17 6 -74 43 18 - 49 48 7 -75 0 9 - 43 17 48 -74 33 56 - 51 57 48 -75 6 8 - 46 31 38 -75 52 23 5 23 45 45 76 -7 - 44 9 39 -75 42 42 - 48 58 9 -76 0 44 - 42 3 10 -75 32 40 - 51 16 43 -76 7 9 - 45 28 21 -76 52 24 5 23 50 45 74 -6 - 42 56 43 -76 42 2 - 48 5 19 -77 1 21 - 40 42 6 -76 31 19 - 50 34 10 -77 8 14 - 44 19 40 -77 52 27 5 23 55 45 71 -5 - 41 36 54 -77 41 20 - 47 8 49 -78 2 3 - 39 13 1 -77 29 52 - 49 49 45 -78 9 26 - 43 4 4 -78 52 32 5 24 0 45 69 -4 - 40 8 21 -78 40 35 - 46 7 34 -79 2 50 - 37 33 48 -78 28 16 - 49 2 50 -79 10 45 - 41 39 25 -79 52 39 5 24 5 45 67 -3 - 38 28 29 -79 39 47 - 45 0 2 -80 3 45 - 35 41 37 -79 26 31 - 48 12 38 -80 12 15 - 40 2 40 -80 52 48 5 24 10 45 64 -2 - 36 33 39 -80 38 52 - 43 44 0 -81 4 48 - 33 32 29 -80 24 31 - 47 17 55 -81 13 56 - 38 9 12 -81 52 56 5 24 15 44 61 -1 - 34 18 30 -81 37 46 - 42 16 5 -82 5 59 - 31 0 42 -81 22 9 - 46 16 49 -82 15 52 Uncertainty in time = +/- 3 secs [Prediction of 2008 Feb 3.0] Data for the target star ------------------------ * name: TYC 7887-02149-1 * constellation : Scorpius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 27 05.0300 DE: -40 08 15.558 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .018, .017 ) * V mag [mag]: 9.3 * B mag [mag]: 9.3 * Apparent position with proper motion RA(deg): 261.9160127213 DE(deg): -40.1448443369 * Equation of equinoxes (radians) : 0.000045078869246 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (773) Irmintraud approx. diameter [km]: 96 approx. diameter ["]: .050 distance from Earth [AU]: 2.65300 * 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): 0.026, 0.013, 84° remarks: * orbital elements for (773) Irmintraud : Mean anomaly = 311.77912970 deg Arg. of pericenter = 334.12950972 deg Long. of node = 322.45855579 deg Inclination = 16.68220436 deg Eccentricity = 0.08217810 Semimajor axis = 2.85748253 AU Perihelion dist = 2.62266004 AU Mag: H = 9.02, G = 0.15 Epoch of elements : MJD 54531.22500000 TDT (2008 Mar 06.225) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Mar 6 773 Irmintraud 5h 23.7m UT 9.3 17 27 5.030-40 8 15.56TYC 7887-02149-1 9.3 14.4 96 4.2 2.653 3.500 -13.23 16.5150 -40.135 101.88 -5.51 5.3957 -0.21852 -0.66746 12.10791 -3.98937 -0.00580 0.00012 2000 311.5291732008 3 5.00000334.129510322.458556 16.6822040.08217810 2.8574825 2.6226600 9.1 5.00.15 RATE 2.0404630 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.032 0.022 86 1.46 0.023 0 54499.5020080306_2149-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Feb 03, 23:27 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org