IOTA/IOTA-ES occultation update for (454) Mathesis / TYC 6872-00072-1 event on 2007 Nov 01, 18:55 UT Visible from Africa Summary ------- On 2007 Nov 01 UT, the 82 km diameter asteroid (454) Mathesis will occult a 10.8 mag star in the constellation Sagittarius for observers along a path across Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.8 mag to 14.6 mag (the magnitude of the asteroid) for at most 2.5 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: 86 * date and approx. time of event: 2007 Nov 01, 18:52 - 2007 Nov 01, 18:58 UT * magnitude of target star: 10.8 * magnitude drop [mag]: 3.8 * estimated maximum duration [s]: 2.5 * Moon: 51 % sunlit, 154° distance * Sun: 63° distance * rough path description: Africa The occultation path -------------------- * approximate projected width [km]: 85 * 1 sigma uncertainty interval [path widths]: +/- 0.59 * 1 sigma uncertainty interval [seconds]: +/- 1.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .030 +/- .023) * 1 sigma uncertainty ellipse (major, minor, PA): ( .030", .023", 90° ) * approx speed of asteroid's shadow [km/s]: 32.2869 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6872-00072-1 by 454 Mathesis on 2007 Nov 01 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 -142 0 0 -20 33 33 18 52 36 0 121 56 -21 0 20 -20 6 49 -21 32 2 .. .. .. -141 0 0 -21 6 55 18 52 36 1 120 57 -21 33 42 -20 40 13 -22 5 22 -20 8 47 -140 0 0 -21 40 5 18 52 37 2 120 58 -22 6 50 -21 13 24 -22 38 29 -20 41 59 -139 0 0 -22 13 1 18 52 37 4 119 59 -22 39 45 -21 46 21 -23 11 22 -21 14 58 -138 0 0 -22 45 42 18 52 37 5 119 60 -23 12 24 -22 19 4 -23 44 0 -21 47 43 -137 0 0 -23 18 8 18 52 37 6 119 61 -23 44 48 -22 51 32 -24 16 22 -22 20 13 -136 0 0 -23 50 18 18 52 38 7 118 61 -24 16 56 -23 23 43 -24 48 27 -22 52 26 -135 0 0 -24 22 10 18 52 38 8 118 62 -24 48 46 -23 55 38 -25 20 15 -23 24 23 -134 0 0 -24 53 45 18 52 39 9 117 63 -25 20 19 -24 27 15 -25 51 44 -23 56 3 -133 0 0 -25 25 1 18 52 39 10 117 63 -25 51 32 -24 58 33 -26 22 55 -24 27 24 -132 0 0 -25 55 58 18 52 40 11 117 64 -26 22 26 -25 29 32 -26 53 46 -24 58 26 -131 0 0 -26 26 34 18 52 41 12 116 65 -26 53 0 -26 0 12 -27 24 17 -25 29 9 -130 0 0 -26 56 50 18 52 42 13 116 65 -27 23 14 -26 30 30 -27 54 27 -25 59 31 -129 0 0 -27 26 45 18 52 42 14 115 66 -27 53 5 -27 0 28 -28 24 15 -26 29 32 -128 0 0 -27 56 18 18 52 43 15 115 67 -28 22 35 -27 30 4 -28 53 41 -26 59 12 -127 0 0 -28 25 29 18 52 44 16 114 67 -28 51 43 -27 59 18 -29 22 45 -27 28 29 -126 0 0 -28 54 16 18 52 45 17 114 67 -29 20 27 -28 28 9 -29 51 25 -27 57 24 -125 0 0 -29 22 40 18 52 46 18 113 68 -29 48 48 -28 56 36 -30 19 42 -28 25 55 -124 0 0 -29 50 41 18 52 48 19 113 68 -30 16 45 -29 24 40 -30 47 35 -28 54 3 -123 0 0 -30 18 17 18 52 49 20 112 69 -30 44 17 -29 52 20 -31 15 3 -29 21 47 -122 0 0 -30 45 28 18 52 50 21 112 69 -31 11 25 -30 19 35 -31 42 6 -29 49 6 -121 0 0 -31 12 15 18 52 51 22 111 69 -31 38 8 -30 46 25 -32 8 45 -30 16 1 -120 0 0 -31 38 36 18 52 53 23 110 69 -32 4 25 -31 12 50 -32 34 57 -30 42 30 -119 0 0 -32 4 31 18 52 54 24 110 69 -32 30 16 -31 38 49 -33 0 44 -31 8 34 -118 0 0 -32 30 0 18 52 55 25 109 70 -32 55 41 -32 4 22 -33 26 5 -31 34 12 -117 0 0 -32 55 3 18 52 57 26 109 70 -33 20 41 -32 29 29 -33 50 59 -31 59 23 -116 0 0 -33 19 40 18 52 58 27 108 70 -33 45 13 -32 54 10 -34 15 27 -32 24 9 -115 0 0 -33 43 50 18 53 0 28 107 70 -34 9 19 -33 18 24 -34 39 28 -32 48 28 -114 0 0 -34 7 34 18 53 1 28 107 69 -34 32 59 -33 42 12 -35 3 2 -33 12 20 -113 0 0 -34 30 50 18 53 3 29 106 69 -34 56 11 -34 5 32 -35 26 10 -33 35 45 -112 0 0 -34 53 39 18 53 4 30 106 69 -35 18 56 -34 28 26 -35 48 50 -33 58 44 -111 0 0 -35 16 1 18 53 6 31 105 69 -35 41 14 -34 50 52 -36 11 3 -34 21 15 -110 0 0 -35 37 56 18 53 8 32 104 69 -36 3 5 -35 12 51 -36 32 49 -34 43 19 -109 0 0 -35 59 24 18 53 10 33 104 68 -36 24 28 -35 34 23 -36 54 7 -35 4 56 -108 0 0 -36 20 24 18 53 11 34 103 68 -36 45 24 -35 55 27 -37 14 58 -35 26 5 -107 0 0 -36 40 57 18 53 13 35 102 68 -37 5 53 -36 16 4 -37 35 22 -35 46 47 -106 0 0 -37 1 3 18 53 15 36 101 67 -37 25 54 -36 36 14 -37 55 18 -36 7 1 -105 0 0 -37 20 41 18 53 17 36 101 67 -37 45 28 -36 55 56 -38 14 47 -36 26 48 -104 0 0 -37 39 51 18 53 19 37 100 67 -38 4 35 -37 15 11 -38 33 49 -36 46 8 -103 0 0 -37 58 35 18 53 20 38 99 66 -38 23 14 -37 33 59 -38 52 23 -37 5 0 -102 0 0 -38 16 51 18 53 22 39 98 66 -38 41 26 -37 52 19 -39 10 31 -37 23 25 -101 0 0 -38 34 40 18 53 24 40 98 65 -38 59 11 -38 10 12 -39 28 11 -37 41 23 -100 0 0 -38 52 1 18 53 26 41 97 65 -39 16 29 -38 27 37 -39 45 24 -37 58 53 - 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Data for the target star ------------------------ * name: TYC 6872-00072-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 52 11.7694 DE: -28 33 45.593 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .027, .021 ) * V mag [mag]: 10.8 * B mag [mag]: 11.1 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (454) Mathesis approx. diameter [km]: 82 approx. diameter ["]: .039 distance from Earth [AU]: 2.89900 * orbital information: orbit source: Preston date of fit: 2007 Oct 23 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 774 number of rejected observations: 130 time covered by the observations: 1900 Mar 31 - 2007 Aug 21 1 sigma uncertainty ellipse (major, minor, PA): 0.012, 0.009, 87° remarks: * orbital elements for (454) Mathesis : Mean anomaly = 78.15432099 deg Arg. of pericenter = 178.04351734 deg Long. of node = 32.44270734 deg Inclination = 6.29694405 deg Eccentricity = 0.11187427 Semimajor axis = 2.62743748 AU Perihelion dist = 2.33349483 AU Mag: H = 9.07, G = 0.15 Epoch of elements : MJD 54405.78900000 TDT (2007 Nov 01.789) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Nov 01 454 Mathesis 18h 55.8m UT 10.8 18 52 11.769-28 33 45.59TYC 6872-00072-1 11.1 14.6 82 2.5 2.899 4.150 8.24 -41.580 -28.565 -108.04 -14.49 18.9298 .03749 -.25053 18.02023 2.71524 0.00515 0.00021 2000 76.814616420071027.00000178.043517 32.442707 6.2969440.111874272.627437482.333494839.205 0.15 RATE 2.3142245 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.030 0.023 89.5 1.590 0.023 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Oct 23, 22:04 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org