IOTA/IOTA-ES occultation update for (1056) Azalea / HIP 78455 event on 2008 May 15, 00:22 UT Visible from Africa, Brazil, Peru Summary ------- On 2008 May 15 UT, the 15 km diameter asteroid (1056) Azalea will occult a 9.6 mag star in the constellation Libra for observers along a path across Africa, Brazil, Peru. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.3 mag to 13.9 mag (the magnitude of the asteroid) for at most 1.8 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: 44 * date and approx. time of event: 2008 May 15, 00:10 - 2008 May 15, 00:35 UT * magnitude of target star: 9.6 * magnitude drop [mag]: 4.3 * estimated maximum duration [s]: 1.8 * Moon: 78 % sunlit, 63° distance * Sun: 170° distance * rough path description: Africa, Brazil, Peru The occultation path -------------------- * approximate projected width [km]: 15 * 1 sigma uncertainty interval [path widths]: +/- 1.48 * 1 sigma uncertainty interval [seconds]: +/- 4.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .045 +/- .029) * 1 sigma uncertainty ellipse (major, minor, PA): ( .046", .028", 103° ) * approx speed of asteroid's shadow [km/s]: 8.1993 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 78455 by 1056 Azalea on 2008 May 15 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 - 91 0 0 1 49 58 0 35 52 0 103 -8 1 54 9 1 45 47 2 6 32 1 33 24 - 90 0 0 1 36 4 0 35 52 1 103 -9 1 40 15 1 31 53 1 52 37 1 19 29 - 89 0 0 1 22 3 0 35 52 2 103 -10 1 26 14 1 17 52 1 38 37 1 5 29 - 88 0 0 1 7 57 0 35 51 3 103 -11 1 12 8 1 3 46 1 24 32 0 51 23 - 87 0 0 0 53 46 0 35 50 4 103 -12 0 57 58 0 49 35 1 10 21 0 37 11 - 86 0 0 0 39 31 0 35 49 5 103 -13 0 43 42 0 35 19 0 56 6 0 22 55 - 85 0 0 0 25 10 0 35 48 6 103 -14 0 29 22 0 20 59 0 41 46 0 8 35 - 84 0 0 0 10 46 0 35 46 7 103 -15 0 14 57 0 6 34 0 27 21 - 0 5 50 - 83 0 0 - 0 3 43 0 35 44 8 103 -16 0 0 29 - 0 7 54 0 12 53 - 0 20 19 - 82 0 0 - 0 18 15 0 35 42 9 103 -17 - 0 14 3 - 0 22 27 - 0 1 39 - 0 34 51 - 81 0 0 - 0 32 50 0 35 39 11 103 -18 - 0 28 39 - 0 37 2 - 0 16 14 - 0 49 27 - 80 0 0 - 0 47 29 0 35 37 12 103 -19 - 0 43 17 - 0 51 41 - 0 30 53 - 1 4 6 - 79 0 0 - 1 2 10 0 35 34 13 103 -20 - 0 57 59 - 1 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20 -12 47 38 -12 27 3 -12 59 56 83 0 0 -12 31 52 0 10 23 14 260 -7 -12 27 43 -12 36 1 -12 15 25 -12 48 19 84 0 0 -12 20 4 0 10 20 13 259 -6 -12 15 55 -12 24 13 -12 3 37 -12 36 32 85 0 0 -12 8 6 0 10 17 12 259 -5 -12 3 57 -12 12 16 -11 51 38 -12 24 34 86 0 0 -11 55 58 0 10 15 11 259 -4 -11 51 48 -12 0 8 -11 39 29 -12 12 27 87 0 0 -11 43 40 0 10 12 10 259 -3 -11 39 30 -11 47 50 -11 27 11 -12 0 9 88 0 0 -11 31 12 0 10 10 9 259 -2 -11 27 2 -11 35 22 -11 14 43 -11 47 42 89 0 0 -11 18 35 0 10 8 8 258 -1 -11 14 25 -11 22 45 -11 2 5 -11 35 5 90 0 0 -11 5 48 0 10 6 7 258 0 -11 1 38 -11 9 58 -10 49 18 -11 22 19 Uncertainty in time = +/- 4 secs [Prediction of 2008 May 8.0] Data for the target star ------------------------ * name: HIP 78455 * constellation : Libra * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 16 01 00.8629 DE: -12 52 24.537 * position source: mpos:UCAC2 pm:UCAC2 plx:HIP * standard error: RA,DE ["]: ( .019, .015 ) * V mag [mag]: 9.6 * B mag [mag]: 10.2 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1056) Azalea approx. diameter [km]: 15 approx. diameter ["]: .019 distance from Earth [AU]: 1.08500 * orbital information: orbit source: Preston date of fit: 2008 May 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1066 number of rejected observations: 34 time covered by the observations: 1924 Feb 01 - 2008 Apr 24 1 sigma uncertainty ellipse (major, minor, PA): 0.042, 0.023, 106° remarks: * orbital elements for (1056) Azalea : Mean anomaly = 300.48470233 deg Arg. of pericenter = 212.29943657 deg Long. of node = 104.21100450 deg Inclination = 5.42585812 deg Eccentricity = 0.17789325 Semimajor axis = 2.22990387 AU Perihelion dist = 1.83321902 AU Mag: H = 11.62, G = 0.15 Epoch of elements : MJD 54601.01600000 TDT (2008 May 15.016) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 15 1056 Azalea 0h 22.9m UT 9.6 16 1 0.863-12 52 24.54HIP 78455 10.2 13.9 15 1.8 1.085 -2.553 3.81 1.4088 -12.875 173.36 18.91 0.3823 -0.00676 -0.06762 -4.60398 0.47021 -0.00068 -0.00056 2000 300.1839782008 514.00000212.299437104.211005 5.4258580.17789325 2.2299039 1.833219011.7 5.00.15 RATE 2.9598850 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.046 0.028 103 2.48 0.028 0 54594.5020080515__78455 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 May 08, 03:16 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org