IOTA/IOTA-ES occultation update for (2709) Sagan / HIP 102078 event on 2012 Aug 23, 09:28 UT Visible from E Australia Summary ------- On 2012 Aug 23 UT, the 20 km diameter asteroid (2709) Sagan will occult a 7.3 mag star in the constellation Aquarius for observers along a path across E Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 8.7 mag to 16.0 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: . The event at a glimpse ---------------------- * Rank: 31 * date and approx. time of event: 2012 Aug 23, 09:15 - 2012 Aug 23, 09:40 UT * geocentric midpoint of event [JD]: 2456162.89501667 * magnitude of target star: 7.3 * magnitude drop [mag]: 8.7 * estimated maximum duration [s]: 2.5 * Moon: 37 % sunlit, 84° distance * Sun: 158° distance * rough path description: E Australia The occultation path -------------------- * approximate projected width [km]: 20 * 1 sigma uncertainty interval [path widths]: +/- 2.15 * 1 sigma uncertainty interval [seconds]: +/- 8.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .076 +/- .048) * 1 sigma uncertainty ellipse (major, minor, PA): ( .078", .045", 75° ) * approx speed of asteroid's shadow [km/s]: 8.1225 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 102078 by 2709 Sagan on 2012 Aug 23 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 119 0 0 -30 2 43 9 40 57 20 94 0 -29 57 12 -30 8 14 -29 33 31 -30 31 57 120 0 0 -30 9 10 9 40 53 21 94 -1 -30 3 40 -30 14 41 -29 40 0 -30 38 23 121 0 0 -30 15 17 9 40 49 22 93 -2 -30 9 47 -30 20 47 -29 46 8 -30 44 28 122 0 0 -30 21 3 9 40 44 23 93 -3 -30 15 33 -30 26 33 -29 51 55 -30 50 13 123 0 0 -30 26 29 9 40 39 24 92 -4 -30 20 59 -30 31 59 -29 57 22 -30 55 38 124 0 0 -30 31 34 9 40 35 24 92 -4 -30 26 5 -30 37 4 -30 2 28 -31 0 42 125 0 0 -30 36 19 9 40 30 25 91 -5 -30 30 50 -30 41 49 -30 7 14 -31 5 26 126 0 0 -30 40 44 9 40 24 26 91 -6 -30 35 15 -30 46 13 -30 11 40 -31 9 50 127 0 0 -30 44 48 9 40 19 27 90 -7 -30 39 19 -30 50 18 -30 15 45 -31 13 54 128 0 0 -30 48 33 9 40 14 28 90 -8 -30 43 4 -30 54 2 -30 19 30 -31 17 37 129 0 0 -30 51 57 9 40 8 29 89 -9 -30 46 28 -30 57 25 -30 22 55 -31 21 1 130 0 0 -30 55 0 9 40 3 30 88 -9 -30 49 32 -31 0 29 -30 25 59 -31 24 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7 255 -29 7 59 14 7 47 52 8 23 39 7 23 25 - 79 0 0 8 10 12 9 15 58 6 255 -28 8 15 52 8 4 31 8 40 15 7 40 6 - 78 0 0 8 26 31 9 15 56 5 256 -27 8 32 11 8 20 50 8 56 32 7 56 27 - 77 0 0 8 42 30 9 15 55 4 256 -26 8 48 10 8 36 51 9 12 29 8 12 29 - 76 0 0 8 58 10 9 15 54 3 256 -25 9 3 50 8 52 31 9 28 7 8 28 11 - 75 0 0 9 13 30 9 15 54 2 256 -24 9 19 9 9 7 52 9 43 25 8 43 34 - 74 0 0 9 28 30 9 15 53 1 256 -23 9 34 9 9 22 52 9 58 23 8 58 36 - 73 0 0 9 43 10 9 15 53 0 256 -22 9 48 48 9 37 32 .. .. .. 9 13 18 Uncertainty in time = +/- 9 secs Prediction of 2012 Jul 8.0 Data for the target star ------------------------ * name: HIP 102078 * constellation : Aquarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 20 41 12.9360 DE: -13 30 01.382 * position source: mpos:HIP2 pm:HIP2 plx:HIP2 * standard error: RA,DE ["]: ( .017, .010 ) * V mag [mag]: 7.3 * B mag [mag]: 8.5 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2709) Sagan approx. diameter [km]: 20 approx. diameter ["]: .021 distance from Earth [AU]: 1.31500 * orbital information: orbit source: Preston date of fit: 2012 Jul 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1157 number of rejected observations: 18 time covered by the observations: 1959 Feb 08 - 2012 May 16 1 sigma uncertainty ellipse (major, minor, PA): 0.076, 0.044, 74° remarks: * orbital elements for (2709) Sagan : Mean anomaly = 122.46969432 deg Arg. of pericenter = 308.32584226 deg Long. of node = 241.17737529 deg Inclination = 2.73270176 deg Eccentricity = 0.07003843 Semimajor axis = 2.19511579 AU Perihelion dist = 2.04137333 AU Mag: H = 13.04, G = 0.15 Epoch of elements : MJD 56162.39500000 TDT (2012 Aug 23.395) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Aug 23 2709 Sagan 9h 28.8m UT 7.3 20 41 12.936-13 30 1.38HIP 102078 8.5 16.0 20 2.5 1.315 -1.994 -9.63 -163.9834 -13.498 38.43 11.24 9.4804 0.04611 -0.13787 -4.35227 -1.44090 0.00203 0.00013 2000 121.7438832012 821.00000308.325842241.177375 2.7327020.07003843 2.1951158 2.041373313.0 5.00.15 RATE 3.0305260 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.078 0.045 75 3.15 0.045 0 0 0-2 056116.0020120823_102078 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 07, 23:44 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org