IOTA/IOTA-ES occultation update for (19) Fortuna / TYC 6261-00062-1 event on 2008 Jul 07, 10:50 UT Visible from New Zealand, Australia Summary ------- On 2008 Jul 07 UT, the 221 km diameter asteroid (19) Fortuna will occult a 11.3 mag star in the constellation Sagittarius for observers along a path across New Zealand, Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.5 mag to 10.7 mag (the magnitude of the asteroid) for at most 21.0 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 100 * date and approx. time of event: 2008 Jul 07, 10:41 - 2008 Jul 07, 11:00 UT * magnitude of target star: 11.3 * magnitude drop [mag]: 0.5 * estimated maximum duration [s]: 21.0 * Moon: 23 % sunlit, 106° distance * Sun: 162° distance * rough path description: New Zealand, Australia The occultation path -------------------- * approximate projected width [km]: 231 * 1 sigma uncertainty interval [path widths]: +/- 0.13 * 1 sigma uncertainty interval [seconds]: +/- 2.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .028 +/- .026) * 1 sigma uncertainty ellipse (major, minor, PA): ( .028", .026", 90° ) * approx speed of asteroid's shadow [km/s]: 10.5219 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6261-00062-1 by 19 Fortuna on 2008 Jul 7 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 98 0 0 -21 12 48 11 0 1 17 107 -1 -20 6 2 -22 19 58 -19 48 44 -22 37 31 99 0 0 -21 35 1 10 59 58 18 106 -2 -20 28 17 -22 42 9 -20 10 59 -22 59 41 100 0 0 -21 57 5 10 59 55 19 106 -3 -20 50 23 -23 4 11 -20 33 6 -23 21 42 101 0 0 -22 19 0 10 59 51 20 105 -4 -21 12 20 -23 26 4 -20 55 4 -23 43 34 102 0 0 -22 40 45 10 59 47 21 105 -5 -21 34 8 -23 47 46 -21 16 52 -24 5 16 103 0 0 -23 2 21 10 59 43 22 105 -6 -21 55 46 -24 9 19 -21 38 31 -24 26 48 104 0 0 -23 23 45 10 59 39 23 104 -7 -22 17 13 -24 30 41 -21 59 59 -24 48 9 105 0 0 -23 44 59 10 59 35 24 104 -8 -22 38 30 -24 51 52 -22 21 17 -25 9 19 106 0 0 -24 6 2 10 59 31 25 103 -9 -22 59 36 -25 12 51 -22 42 23 -25 30 18 107 0 0 -24 26 53 10 59 26 26 103 -10 -23 20 30 -25 33 39 -23 3 18 -25 51 5 108 0 0 -24 47 32 10 59 21 27 102 -11 -23 41 13 -25 54 15 -23 24 2 -26 11 40 109 0 0 -25 8 0 10 59 17 28 102 -11 -24 1 44 -26 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-22 25 41 - 93 0 0 -20 38 26 10 41 20 12 252 -29 -19 31 35 -21 45 40 -19 14 16 -22 3 13 - 92 0 0 -20 15 48 10 41 18 11 251 -28 -19 8 56 -21 23 4 -18 51 36 -21 40 38 - 91 0 0 -19 53 3 10 41 16 10 251 -27 -18 46 10 -21 0 21 -18 28 50 -21 17 55 - 90 0 0 -19 30 12 10 41 15 9 251 -26 -18 23 16 -20 37 31 -18 5 56 -20 55 5 - 89 0 0 -19 7 14 10 41 13 8 250 -25 -18 0 17 -20 14 34 -17 42 57 -20 32 9 - 88 0 0 -18 44 10 10 41 12 7 250 -24 -17 37 12 -19 51 31 -17 19 52 -20 9 6 - 87 0 0 -18 21 1 10 41 10 6 250 -23 -17 14 2 -19 28 23 -16 56 41 -19 45 58 - 86 0 0 -17 57 47 10 41 9 5 249 -22 -16 50 48 -19 5 9 -16 33 26 -19 22 45 - 85 0 0 -17 34 28 10 41 9 3 249 -21 -16 27 29 -18 41 51 -16 10 8 -18 59 27 - 84 0 0 -17 11 6 10 41 8 2 249 -20 -16 4 6 -18 18 29 -15 46 45 -18 36 5 - 83 0 0 -16 47 41 10 41 8 1 248 -19 -15 40 41 -17 55 4 -15 23 20 -18 12 40 - 82 0 0 -16 24 13 10 41 8 0 248 -18 .. .. .. -17 31 36 .. .. .. -17 49 11 Uncertainty in time = +/- 3 secs [Prediction of 2008 Jul 2.0] Data for the target star ------------------------ * name: TYC 6261-00062-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 51 25.3986 DE: -21 08 31.616 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .026, .024 ) * V mag [mag]: 11.3 * B mag [mag]: 12.1 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (19) Fortuna approx. diameter [km]: 221 approx. diameter ["]: .192 distance from Earth [AU]: 1.58800 * orbital information: orbit source: Preston date of fit: 2008 Jul 02 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 1592 number of rejected observations: 258 time covered by the observations: 1900 Feb 12 - 2008 Jun 28 1 sigma uncertainty ellipse (major, minor, PA): 0.012, 0.010, 90° remarks: * orbital elements for (19) Fortuna : Mean anomaly = 258.56659562 deg Arg. of pericenter = 181.81994737 deg Long. of node = 211.33492939 deg Inclination = 1.57237710 deg Eccentricity = 0.15830834 Semimajor axis = 2.44334025 AU Perihelion dist = 2.05653911 AU Mag: H = 7.13, G = 0.10 Epoch of elements : MJD 54654.45200000 TDT (2008 Jul 07.452) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jul 7 19 Fortuna 10h 50.8m UT 11.3 17 51 25.399-21 8 31.62TYC 6261-00062-1 12.1 10.7 221 21.0 1.588 -2.349 0.46 179.3743 -21.143 18.55 22.52 10.8468 -0.00415 -0.28496 -5.93828 0.08229 0.00168 -0.00023 2000 257.4176932008 7 3.00000181.819947211.334929 1.5723770.15830834 2.4433403 2.0565391 7.1 5.00.10 RATE 2.5806440 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.028 0.026 90 1.13 0.026 0 54649.5020080707_0062-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jul 02, 19:08 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org