IOTA/IOTA-ES occultation update for (873) Mechthild / TYC 5796-00313-1 event on 2007 Aug 02, 22:23 UT Visible from China, India, Africa Summary ------- On 2007 Aug 02 UT, the 29 km diameter asteroid (873) Mechthild will occult a 11.4 mag star in the constellation Capricornus for observers along a path across China, India, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.2 mag to 14.5 mag (the magnitude of the asteroid) for at most 3.2 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: 45 * date and approx. time of event: 2007 Aug 02, 22:12 - 2007 Aug 02, 22:34 UT * magnitude of target star: 11.4 * magnitude drop [mag]: 3.2 * estimated maximum duration [s]: 3.2 * Moon: 81 % sunlit, 37° distance * Sun: 166° distance * rough path description: China, India, Africa The occultation path -------------------- * approximate projected width [km]: 31 * 1 sigma uncertainty interval [path widths]: +/- 1.44 * 1 sigma uncertainty interval [seconds]: +/- 5.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .054 +/- .040) * 1 sigma uncertainty ellipse (major, minor, PA): ( .054", .040", 80° ) * approx speed of asteroid's shadow [km/s]: 9.1007 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5796-00313-1 by 873 Mechthild on 2007 Aug 02 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 - 56 0 0 -10 40 54 22 34 35 0 102 -14 -10 32 23 -10 49 25 -10 7 47 .. .. .. - 55 0 0 -10 52 59 22 34 35 1 102 -15 -10 44 28 -11 1 28 -10 19 56 .. .. .. - 54 0 0 -11 4 28 22 34 34 2 101 -16 -10 55 58 -11 12 56 -10 31 29 .. .. .. - 53 0 0 -11 15 21 22 34 34 3 101 -17 -11 6 53 -11 23 49 -10 42 26 -11 48 9 - 52 0 0 -11 25 40 22 34 33 4 101 -18 -11 17 12 -11 34 7 -10 52 48 -11 58 25 - 51 0 0 -11 35 23 22 34 32 5 101 -19 -11 26 57 -11 43 50 -11 2 35 -12 8 5 - 50 0 0 -11 44 32 22 34 31 6 101 -20 -11 36 7 -11 52 58 -11 11 48 -12 17 10 - 49 0 0 -11 53 6 22 34 29 7 100 -21 -11 44 41 -12 1 31 -11 20 25 -12 25 41 - 48 0 0 -12 1 6 22 34 27 8 100 -22 -11 52 42 -12 9 30 -11 28 27 -12 33 38 - 47 0 0 -12 8 31 22 34 26 9 100 -23 -12 0 8 -12 16 54 -11 35 55 -12 41 1 - 46 0 0 -12 15 22 22 34 23 10 100 -23 -12 6 59 -12 23 44 -11 42 48 -12 47 49 - 45 0 0 -12 21 38 22 34 21 11 100 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235 -6 40 17 10 39 58 22 40 44 19 39 31 22 95 0 0 40 31 29 22 13 7 18 236 -5 40 40 51 40 22 6 41 7 55 39 55 11 96 0 0 40 54 43 22 13 4 17 237 -4 41 4 4 40 45 23 41 31 3 40 18 32 97 0 0 41 17 30 22 13 1 16 237 -4 41 26 49 41 8 11 41 53 43 40 41 25 98 0 0 41 39 48 22 12 58 16 238 -3 41 49 5 41 30 31 42 15 54 41 3 50 99 0 0 42 1 38 22 12 55 15 239 -2 42 10 54 41 52 23 42 37 37 41 25 47 100 0 0 42 23 0 22 12 53 14 239 -1 42 32 14 42 13 47 42 58 53 41 47 16 101 0 0 42 43 54 22 12 50 13 240 0 42 53 6 42 34 42 43 19 40 42 8 17 102 0 0 43 4 20 22 12 48 12 241 1 43 13 30 42 55 10 43 39 58 42 28 49 103 0 0 43 24 17 22 12 46 12 242 1 43 33 26 43 15 9 43 59 49 42 48 54 104 0 0 43 43 47 22 12 44 11 242 2 43 52 54 43 34 41 44 19 12 43 8 30 105 0 0 44 2 49 22 12 42 10 243 3 44 11 54 43 53 44 44 38 7 43 27 39 106 0 0 44 21 23 22 12 40 9 244 4 44 30 27 44 12 20 44 56 35 43 46 20 107 0 0 44 39 30 22 12 39 9 244 4 44 48 31 44 30 29 45 14 34 44 4 33 108 0 0 44 57 9 22 12 37 8 245 5 45 6 9 44 48 9 45 32 7 44 22 19 109 0 0 45 14 20 22 12 36 7 246 6 45 23 18 45 5 22 45 49 11 44 39 37 110 0 0 45 31 4 22 12 35 6 246 7 45 40 1 45 22 8 46 5 49 44 56 27 111 0 0 45 47 21 22 12 34 5 247 7 45 56 16 45 38 27 46 22 0 45 12 51 112 0 0 46 3 11 22 12 33 5 248 8 46 12 5 45 54 19 46 37 43 45 28 47 113 0 0 46 18 35 22 12 32 4 249 9 46 27 26 46 9 43 46 53 0 45 44 17 114 0 0 46 33 31 22 12 32 3 249 10 46 42 21 46 24 42 47 7 50 45 59 19 115 0 0 46 48 1 22 12 31 3 250 10 46 56 49 46 39 13 47 22 14 46 13 55 116 0 0 47 2 5 22 12 31 2 251 11 47 10 51 46 53 18 47 36 12 46 28 5 117 0 0 47 15 42 22 12 31 1 251 12 47 24 27 47 6 57 47 49 43 46 41 48 118 0 0 47 28 53 22 12 31 0 252 13 47 37 37 47 20 10 48 2 49 46 55 5 Data for the target star ------------------------ * name: TYC 5796-00313-1 * constellation : Capricornus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 21 42 46.5692 DE: -11 42 40.569 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .026, .019 ) * V mag [mag]: 11.4 * B mag [mag]: 11.7 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (873) Mechthild approx. diameter [km]: 29 approx. diameter ["]: .029 distance from Earth [AU]: 1.38600 * orbital information: orbit source: Preston date of fit: 2007 Jul 28 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 800 number of rejected observations: 55 time covered by the observations: 1917 May 21 - 2007 Jul 26 1 sigma uncertainty ellipse (major, minor, PA): 0.048, 0.035, 77° remarks: * orbital elements for (873) Mechthild : Mean anomaly = 45.37248771 deg Arg. of pericenter = 108.43158755 deg Long. of node = 150.30013298 deg Inclination = 5.26415838 deg Eccentricity = 0.15071183 Semimajor axis = 2.62558963 AU Perihelion dist = 2.22988221 AU Mag: H = 11.34, G = 0.15 Epoch of elements : MJD 54314.93300000 TDT (2007 Aug 02.933) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Aug 02 873 Mechthild 22h 23.5m UT 11.4 21 42 46.569-11 42 40.57TYC 5796-00313-1 11.7 14.5 29 3.2 1.386 -1.927 -16.18 38.680 -11.706 -154.31 17.67 22.3922 -.16091 .28214 -4.45947 -2.54926 -0.00119 -0.00060 2000 44.22967562007 729.00000108.431588150.300133 5.2641580.150711832.625589632.2298822111.45 0.15 RATE 2.3166680 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.054 0.040 79.9 2.440 0.041 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Jul 29, 02:19 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org