IOTA/IOTA-ES occultation update for (1154) Astronomia / HIP 55820 event on 2009 Apr 03, 14:54 UT Visible from Summary ------- On 2009 Apr 03 UT, the 61 km diameter asteroid (1154) Astronomia will occult a 8.8 mag star in the constellation Leo for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 6.9 mag to 15.7 mag (the magnitude of the asteroid) for at most 5.4 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: . The event at a glimpse ---------------------- * Rank: 69 * date and approx. time of event: 2009 Apr 03, 14:47 - 2009 Apr 03, 15:01 UT * magnitude of target star: 8.8 * magnitude drop [mag]: 6.9 * estimated maximum duration [s]: 5.4 * Moon: 62 % sunlit, 51° distance * Sun: 154° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 75 * 1 sigma uncertainty interval [path widths]: +/- 0.85 * 1 sigma uncertainty interval [seconds]: +/- 6.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .039 +/- .030) * 1 sigma uncertainty ellipse (major, minor, PA): ( .039", .029", 106° ) * approx speed of asteroid's shadow [km/s]: 11.3848 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 55820 by 1154 Astronomia on 2009 Apr 3 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 54 0 0 56 20 13 15 1 9 25 110 0 56 40 36 55 59 55 57 15 28 55 25 36 55 0 0 56 20 8 15 1 6 25 110 -1 56 40 31 55 59 50 57 15 23 55 25 31 56 0 0 56 19 48 15 1 4 26 111 -1 56 40 12 55 59 30 57 15 4 55 25 10 57 0 0 56 19 14 15 1 1 26 112 -2 56 39 38 55 58 55 57 14 30 55 24 35 58 0 0 56 18 25 15 0 58 27 113 -2 56 38 49 55 58 6 57 13 42 55 23 46 59 0 0 56 17 21 15 0 55 27 114 -3 56 37 46 55 57 2 57 12 40 55 22 41 60 0 0 56 16 3 15 0 52 28 115 -3 56 36 28 55 55 44 57 11 23 55 21 22 61 0 0 56 14 31 15 0 48 28 116 -4 56 34 56 55 54 10 57 9 52 55 19 48 62 0 0 56 12 43 15 0 45 29 117 -4 56 33 9 55 52 23 57 8 6 55 17 59 63 0 0 56 10 42 15 0 42 29 118 -5 56 31 8 55 50 20 57 6 6 55 15 56 64 0 0 56 8 25 15 0 39 30 119 -5 56 28 52 55 48 3 57 3 51 55 13 37 65 0 0 56 5 54 15 0 35 30 120 -6 56 26 22 55 45 31 57 1 22 55 11 4 66 0 0 56 3 8 15 0 32 31 121 -7 56 23 37 55 42 45 56 58 39 55 8 16 67 0 0 56 0 8 15 0 28 31 122 -7 56 20 38 55 39 44 56 55 41 55 5 14 68 0 0 55 56 53 15 0 25 32 123 -8 56 17 24 55 36 28 56 52 28 55 1 56 69 0 0 55 53 23 15 0 21 32 124 -8 56 13 55 55 32 57 56 49 1 54 58 24 70 0 0 55 49 39 15 0 18 33 125 -9 56 10 12 55 29 12 56 45 20 54 54 37 71 0 0 55 45 40 15 0 14 33 126 -9 56 6 14 55 25 11 56 41 24 54 50 35 72 0 0 55 41 26 15 0 10 34 127 -10 56 2 1 55 20 56 56 37 13 54 46 18 73 0 0 55 36 57 15 0 6 34 128 -10 55 57 33 55 16 26 56 32 47 54 41 46 74 0 0 55 32 13 15 0 3 35 129 -11 55 52 51 55 11 41 56 28 7 54 36 59 75 0 0 55 27 15 14 59 59 35 130 -11 55 47 54 55 6 42 56 23 12 54 31 57 76 0 0 55 22 2 14 59 55 36 131 -12 55 42 42 55 1 27 56 18 3 54 26 40 77 0 0 55 16 33 14 59 51 36 132 -12 55 37 15 54 55 57 56 12 38 54 21 8 78 0 0 55 10 50 14 59 47 37 133 -13 55 31 33 54 50 12 56 6 59 54 15 21 79 0 0 55 4 52 14 59 42 37 134 -14 55 25 36 54 44 13 56 1 5 54 9 18 80 0 0 54 58 38 14 59 38 38 135 -14 55 19 24 54 37 58 55 54 56 54 3 1 81 0 0 54 52 10 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Uncertainty in time = +/- 6 secs [Prediction of 2008 Nov 16.0] Data for the target star ------------------------ * name: HIP 55820 * constellation : Leo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 11 26 24.7586 DE: +10 25 22.298 * position source: mpos:HIP2 pm:HIP2 plx:HIP2 * standard error: RA,DE ["]: ( .020, .017 ) * V mag [mag]: 8.8 * B mag [mag]: 9.3 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1154) Astronomia approx. diameter [km]: 61 approx. diameter ["]: .034 distance from Earth [AU]: 2.49100 * orbital information: orbit source: Preston date of fit: 2008 Nov 16 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1014 number of rejected observations: 41 time covered by the observations: 1911 Sep 03 - 2008 May 14 1 sigma uncertainty ellipse (major, minor, PA): 0.034, 0.024, 112° remarks: * orbital elements for (1154) Astronomia : Mean anomaly = 267.52050432 deg Arg. of pericenter = 193.52827372 deg Long. of node = 82.86711609 deg Inclination = 4.55853669 deg Eccentricity = 0.07425088 Semimajor axis = 3.38683256 AU Perihelion dist = 3.13535726 AU Mag: H = 10.35, G = 0.15 Epoch of elements : MJD 54924.62100000 TDT (2009 Apr 03.621) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Apr 3 1154 Astronomia 14h 54.7m UT 8.8 11 26 24.759 10 25 22.30HIP 55820 9.3 15.7 61 5.4 2.491 -1.466 6.80 115.8537 10.422 -42.87 5.52 14.9118 0.17561 0.55851 -6.12968 1.92850 0.00214 -0.00155 2000 266.7897872009 330.00000193.528274 82.867116 4.5585370.07425088 3.3868326 3.135357310.5 5.00.15 RATE 1.5812970 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.039 0.029 106 1.85 0.029 0 54786.5020090403__55820 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 16, 17:53 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org