IOTA/IOTA-ES occultation update for (80) Sappho / TYC 5151-01208-1 event on 2007 Aug 01, 12:24 UT Visible from Australia Summary ------- On 2007 Aug 01 UT, the 78 km diameter asteroid (80) Sappho will occult a 10.7 mag star in the constellation Aquila for observers along a path across Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.5 mag to 10.1 mag (the magnitude of the asteroid) for at most 11.4 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: 95 * date and approx. time of event: 2007 Aug 01, 12:09 - 2007 Aug 01, 12:39 UT * magnitude of target star: 10.7 * magnitude drop [mag]: 0.5 * estimated maximum duration [s]: 11.4 * Moon: 92 % sunlit, 44° distance * Sun: 160° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 82 * 1 sigma uncertainty interval [path widths]: +/- 0.43 * 1 sigma uncertainty interval [seconds]: +/- 5.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .048 +/- .047) * 1 sigma uncertainty ellipse (major, minor, PA): ( .048", .047", 87° ) * approx speed of asteroid's shadow [km/s]: 6.8286 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5151-01208-1 by 80 Sappho on 2007 Aug 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 67 0 0 -31 22 52 12 39 5 0 94 3 -31 0 35 -31 45 12 -30 41 27 -32 4 27 68 0 0 -31 25 59 12 39 5 1 93 2 -31 3 42 -31 48 19 -30 44 35 -32 7 33 69 0 0 -31 28 53 12 39 5 2 93 1 -31 6 37 -31 51 13 -30 47 29 -32 10 27 70 0 0 -31 31 35 12 39 4 3 92 0 -31 9 19 -31 53 54 -30 50 11 -32 13 8 71 0 0 -31 34 4 12 39 3 3 91 -1 -31 11 48 -31 56 23 -30 52 41 -32 15 37 72 0 0 -31 36 20 12 39 2 4 91 -1 -31 14 4 -31 58 39 -30 54 57 -32 17 53 73 0 0 -31 38 24 12 39 1 5 90 -2 -31 16 8 -32 0 42 -30 57 1 -32 19 56 74 0 0 -31 40 14 12 39 0 6 90 -3 -31 17 59 -32 2 33 -30 58 52 -32 21 47 75 0 0 -31 41 53 12 38 58 7 89 -4 -31 19 37 -32 4 11 -31 0 30 -32 23 25 76 0 0 -31 43 18 12 38 56 8 89 -5 -31 21 3 -32 5 37 -31 1 56 -32 24 51 77 0 0 -31 44 31 12 38 54 9 88 -5 -31 22 16 -32 6 50 -31 3 9 -32 26 4 78 0 0 -31 45 32 12 38 52 9 88 -6 -31 23 16 -32 7 50 -31 4 10 -32 27 4 79 0 0 -31 46 20 12 38 49 10 87 -7 -31 24 4 -32 8 38 -31 4 57 -32 27 52 80 0 0 -31 46 55 12 38 47 11 87 -8 -31 24 39 -32 9 14 -31 5 33 -32 28 27 81 0 0 -31 47 18 12 38 44 12 86 -9 -31 25 2 -32 9 37 -31 5 56 -32 28 50 82 0 0 -31 47 29 12 38 41 13 86 -9 -31 25 13 -32 9 47 -31 6 6 -32 29 1 83 0 0 -31 47 27 12 38 38 14 85 -10 -31 25 10 -32 9 45 -31 6 4 -32 28 59 84 0 0 -31 47 12 12 38 34 14 85 -11 -31 24 56 -32 9 31 -31 5 49 -32 28 45 85 0 0 -31 46 45 12 38 30 15 84 -12 -31 24 29 -32 9 5 -31 5 22 -32 28 19 86 0 0 -31 46 6 12 38 26 16 84 -13 -31 23 50 -32 8 26 -31 4 43 -32 27 40 87 0 0 -31 45 15 12 38 22 17 83 -13 -31 22 58 -32 7 34 -31 3 51 -32 26 49 88 0 0 -31 44 11 12 38 18 18 82 -14 -31 21 54 -32 6 31 -31 2 47 -32 25 46 89 0 0 -31 42 55 12 38 14 19 82 -15 -31 20 38 -32 5 15 -31 1 31 -32 24 30 90 0 0 -31 41 27 12 38 9 19 81 -16 -31 19 10 -32 3 48 -31 0 2 -32 23 3 91 0 0 -31 39 47 12 38 4 20 81 -17 -31 17 30 -32 2 8 -30 58 22 -32 21 23 92 0 0 -31 37 55 12 37 59 21 80 -18 -31 15 37 -32 0 16 -30 56 29 -32 19 31 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- 8 27 16 -122 0 0 - 7 38 1 12 10 25 18 269 -32 - 7 15 36 - 8 0 29 - 6 56 22 - 8 19 51 -121 0 0 - 7 30 49 12 10 20 17 269 -31 - 7 8 24 - 7 53 16 - 6 49 10 - 8 12 38 -120 0 0 - 7 23 49 12 10 15 16 269 -30 - 7 1 25 - 7 46 16 - 6 42 11 - 8 5 36 -119 0 0 - 7 17 0 12 10 11 15 269 -29 - 6 54 37 - 7 39 27 - 6 35 24 - 7 58 47 -118 0 0 - 7 10 25 12 10 6 14 269 -28 - 6 48 1 - 7 32 51 - 6 28 48 - 7 52 11 -117 0 0 - 7 4 1 12 10 2 13 268 -27 - 6 41 38 - 7 26 27 - 6 22 26 - 7 45 46 -116 0 0 - 6 57 50 12 9 59 12 268 -26 - 6 35 28 - 7 20 15 - 6 16 16 - 7 39 35 -115 0 0 - 6 51 52 12 9 55 11 268 -25 - 6 29 30 - 7 14 17 - 6 10 18 - 7 33 36 -114 0 0 - 6 46 7 12 9 52 10 268 -24 - 6 23 45 - 7 8 31 - 6 4 34 - 7 27 50 -113 0 0 - 6 40 35 12 9 49 9 268 -23 - 6 18 13 - 7 2 59 - 5 59 2 - 7 22 17 -112 0 0 - 6 35 15 12 9 46 8 268 -22 - 6 12 54 - 6 57 39 - 5 53 44 - 7 16 57 -111 0 0 - 6 30 10 12 9 44 7 268 -21 - 6 7 49 - 6 52 33 - 5 48 38 - 7 11 51 -110 0 0 - 6 25 17 12 9 42 6 268 -20 - 6 2 57 - 6 47 40 - 5 43 47 - 7 6 58 -109 0 0 - 6 20 38 12 9 40 5 268 -19 - 5 58 18 - 6 43 1 - 5 39 8 - 7 2 19 -108 0 0 - 6 16 13 12 9 39 4 267 -18 - 5 53 54 - 6 38 36 - 5 34 44 - 6 57 53 -107 0 0 - 6 12 2 12 9 37 4 267 -17 - 5 49 43 - 6 34 24 - 5 30 33 - 6 53 41 -106 0 0 - 6 8 5 12 9 36 3 267 -16 - 5 45 45 - 6 30 27 - 5 26 36 - 6 49 44 -105 0 0 - 6 4 21 12 9 36 2 267 -15 - 5 42 2 - 6 26 43 .. .. .. - 6 46 0 -104 0 0 - 6 0 52 12 9 36 1 267 -14 - 5 38 33 - 6 23 14 .. .. .. - 6 42 30 Data for the target star ------------------------ * name: TYC 5151-01208-1 * constellation : Aquila * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 19 52 54.1403 DE: -03 05 24.854 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .044, .045 ) * V mag [mag]: 10.7 * B mag [mag]: 12.5 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (80) Sappho approx. diameter [km]: 78 approx. diameter ["]: .109 distance from Earth [AU]: 0.98500 * orbital information: orbit source: Preston date of fit: 2007 Jul 28 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 812 number of rejected observations: 180 time covered by the observations: 1903 Oct 24 - 2007 Jul 26 1 sigma uncertainty ellipse (major, minor, PA): 0.021, 0.014, 75° remarks: * orbital elements for (80) Sappho : Mean anomaly = 323.28545131 deg Arg. of pericenter = 139.19450339 deg Long. of node = 218.80915962 deg Inclination = 8.66226186 deg Eccentricity = 0.19985070 Semimajor axis = 2.29598726 AU Perihelion dist = 1.83713260 AU Mag: H = 7.94, G = 0.15 Epoch of elements : MJD 54313.51700000 TDT (2007 Aug 01.517) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Aug 01 80 Sappho 12h 24.4m UT 10.7 19 52 54.140- 3 5 24.85TYC 5151-01208-1 12.5 10.1 78 11.4 0.985 -2.242 -7.55 162.403 -3.089 -4.50 18.03 12.4058 .06963 -.31112 -3.76077 -0.84362 0.00105 -0.00131 2000 322.2890772007 729.00000139.194503218.809160 8.6622620.199850702.295987261.837132607.985 0.15 RATE 2.8330210 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.048 0.047 87.2 1.430 0.047 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Jul 29, 02:05 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org