IOTA/IOTA-ES occultation update for (4369) Seifert / TYC 7392-00235-1 event on 2007 Jul 03, 05:21 UT Visible from Brazil, Bolivia, Peru Summary ------- On 2007 Jul 03 UT, the 18 km diameter asteroid (4369) Seifert will occult a 10.1 mag star in the constellation Sagittarius for observers along a path across Brazil, Bolivia, Peru. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.2 mag to 15.3 mag (the magnitude of the asteroid) for at most 1.5 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: 12 * date and approx. time of event: 2007 Jul 03, 05:12 - 2007 Jul 03, 05:29 UT * magnitude of target star: 10.1 * magnitude drop [mag]: 5.2 * estimated maximum duration [s]: 1.5 * Moon: 92 % sunlit, 40° distance * Sun: 169° distance * rough path description: Brazil, Bolivia, Peru The occultation path -------------------- * approximate projected width [km]: 19 * 1 sigma uncertainty interval [path widths]: +/- 5.71 * 1 sigma uncertainty interval [seconds]: +/- 9.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .116 +/- .086) * 1 sigma uncertainty ellipse (major, minor, PA): ( .117", .085", 78° ) * approx speed of asteroid's shadow [km/s]: 11.9735 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7392-00235-1 by 4369 Seifert on 2007 Jul 03 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 -159 0 0 28 56 40 5 29 0 0 126 1 29 3 6 28 50 13 .. .. .. .. .. .. -158 0 0 28 17 41 5 29 0 2 127 0 28 24 8 28 11 14 29 38 11 .. .. .. -157 0 0 27 38 22 5 29 0 3 127 -1 27 44 49 27 31 55 28 58 56 .. .. .. -156 0 0 26 58 43 5 28 59 4 128 -2 27 5 11 26 52 16 28 19 21 .. .. .. -155 0 0 26 18 46 5 28 58 5 128 -3 26 25 14 26 12 19 27 39 28 24 58 55 -154 0 0 25 38 33 5 28 57 6 129 -4 25 45 1 25 32 5 26 59 16 24 18 39 -153 0 0 24 58 3 5 28 56 7 129 -6 25 4 32 24 51 36 26 18 48 23 38 9 -152 0 0 24 17 20 5 28 54 8 130 -7 24 23 48 24 10 52 25 38 5 22 57 25 -151 0 0 23 36 24 5 28 53 9 130 -8 23 42 52 23 29 56 24 57 9 22 16 30 -150 0 0 22 55 17 5 28 51 10 130 -9 23 1 45 22 48 50 24 16 1 21 35 24 -149 0 0 22 14 1 5 28 49 12 131 -10 22 20 29 22 7 33 23 34 42 20 54 10 -148 0 0 21 32 36 5 28 46 13 131 -11 21 39 4 21 26 9 22 53 14 20 12 48 -147 0 0 20 51 5 5 28 44 14 132 -12 20 57 32 20 44 38 22 11 39 19 31 21 -146 0 0 20 9 28 5 28 41 15 132 -14 20 15 55 20 3 2 21 29 58 18 49 49 -145 0 0 19 27 49 5 28 38 16 132 -15 19 34 15 19 21 22 20 48 13 18 8 14 -144 0 0 18 46 7 5 28 35 17 133 -16 18 52 33 18 39 41 20 6 24 17 26 39 -143 0 0 18 4 24 5 28 31 19 133 -17 18 10 50 17 57 59 19 24 35 16 45 3 -142 0 0 17 22 43 5 28 27 20 133 -18 17 29 8 17 16 19 18 42 46 16 3 29 -141 0 0 16 41 5 5 28 23 21 134 -19 16 47 29 16 34 41 18 0 59 15 21 59 -140 0 0 15 59 30 5 28 19 22 134 -20 16 5 54 15 53 7 17 19 15 14 40 34 -139 0 0 15 18 1 5 28 15 23 134 -22 15 24 24 15 11 39 16 37 37 13 59 15 -138 0 0 14 36 40 5 28 10 24 135 -23 14 43 1 14 30 18 15 56 4 13 18 3 -137 0 0 13 55 27 5 28 5 25 135 -24 14 1 47 13 49 6 15 14 40 12 37 1 -136 0 0 13 14 23 5 28 0 27 135 -25 13 20 43 13 8 4 14 33 25 11 56 9 -135 0 0 12 33 32 5 27 55 28 136 -26 12 39 51 12 27 13 13 52 21 11 15 29 -134 0 0 11 52 53 5 27 50 29 136 -27 11 59 11 11 46 35 13 11 29 10 35 2 -133 0 0 11 12 28 5 27 44 30 136 -29 11 18 45 11 6 11 12 30 51 9 54 50 -132 0 0 10 32 18 5 27 38 31 137 -30 10 38 34 10 26 2 11 50 28 9 14 54 -131 0 0 9 52 25 5 27 32 32 137 -31 9 58 40 9 46 11 11 10 21 8 35 15 -130 0 0 9 12 50 5 27 26 33 137 -32 9 19 3 9 6 36 10 30 31 7 55 53 -129 0 0 8 33 34 5 27 20 35 138 -33 8 39 46 8 27 21 9 51 0 7 16 52 -128 0 0 7 54 37 5 27 13 36 138 -34 8 0 49 7 48 26 9 11 49 6 38 10 -127 0 0 7 16 2 5 27 6 37 138 -36 7 22 12 7 9 53 8 32 58 5 59 50 -126 0 0 6 37 50 5 26 59 38 139 -37 6 43 58 6 31 41 7 54 30 5 21 53 -125 0 0 6 0 0 5 26 52 39 139 -38 6 6 8 5 53 53 7 16 24 4 44 19 -124 0 0 5 22 35 5 26 45 40 139 -39 5 28 41 5 16 29 6 38 42 4 7 9 -123 0 0 4 45 34 5 26 38 41 140 -40 4 51 39 4 39 30 6 1 26 3 30 25 -122 0 0 4 9 0 5 26 30 42 140 -41 4 15 4 4 2 57 5 24 35 2 54 6 -121 0 0 3 32 52 5 26 23 43 140 -42 3 38 55 3 26 50 4 48 10 2 18 15 -120 0 0 2 57 12 5 26 15 45 141 -44 3 3 13 2 51 11 4 12 13 1 42 51 -119 0 0 2 22 0 5 26 7 46 141 -45 2 28 0 2 16 1 3 36 45 1 7 55 -118 0 0 1 47 17 5 25 59 47 142 -46 1 53 15 1 41 19 3 1 45 0 33 29 -117 0 0 1 13 3 5 25 51 48 142 -47 1 19 0 1 7 7 2 27 14 - 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Data for the target star ------------------------ * name: TYC 7392-00235-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 15 58.0191 DE: -31 07 41.643 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .025 ) * V mag [mag]: 10.1 * B mag [mag]: 11.3 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (4369) Seifert approx. diameter [km]: 18 approx. diameter ["]: .016 distance from Earth [AU]: 1.55500 * orbital information: orbit source: Preston date of fit: 2007 Jun 28 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 480 number of rejected observations: 19 time covered by the observations: 1940 Sep 06 - 2006 Aug 06 1 sigma uncertainty ellipse (major, minor, PA): 0.115, 0.081, 78° remarks: * orbital elements for (4369) Seifert : Mean anomaly = 288.73992269 deg Arg. of pericenter = 76.86190235 deg Long. of node = 299.46736888 deg Inclination = 11.81339423 deg Eccentricity = 0.25232056 Semimajor axis = 2.61091398 AU Perihelion dist = 1.95212670 AU Mag: H = 11.82, G = 0.15 Epoch of elements : MJD 54284.22300000 TDT (2007 Jul 03.223) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Jul 03 4369 Seifert 5h 20.6m UT 10.1 18 15 58.019-31 7 41.64TYC 7392-00235-1 11.3 15.3 18 1.5 1.555 -2.865 10.31 272.978 -31.131 100.88 22.99 5.3435 .08721 .31169 -6.50772 1.82271 0.00066 0.00075 2000 287.7533332007 629.00000 76.861902299.467369 11.8133940.252320562.610913981.9521267011.95 0.15 RATE 2.3362280 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.117 0.085 78.4 6.710 0.091 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Jun 29, 02:18 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org