IOTA/IOTA-ES occultation update for (480) Hansa / TYC 1075-00690-1 event on 2009 Aug 01, 18:21 UT Visible from Summary ------- On 2009 Aug 01 UT, the 59 km diameter asteroid (480) Hansa will occult a 10.8 mag star in the constellation Aquila for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.0 mag to 12.6 mag (the magnitude of the asteroid) for at most 5.0 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: 89 * date and approx. time of event: 2009 Aug 01, 18:14 - 2009 Aug 01, 18:28 UT * magnitude of target star: 10.8 * magnitude drop [mag]: 2.0 * estimated maximum duration [s]: 5.0 * Moon: 85 % sunlit, 52° distance * Sun: 149° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 69 * 1 sigma uncertainty interval [path widths]: +/- 0.54 * 1 sigma uncertainty interval [seconds]: +/- 3.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .029 +/- .024) * 1 sigma uncertainty ellipse (major, minor, PA): ( .029", .024", 80° ) * approx speed of asteroid's shadow [km/s]: 11.8112 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1075-00690-1 by 480 Hansa on 2009 Aug 1 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 6 0 0 30 38 11 18 28 3 26 92 0 30 57 39 30 18 48 31 18 44 29 57 57 7 0 0 30 52 18 18 27 59 26 92 -1 31 11 46 30 32 55 31 32 51 30 12 3 8 0 0 31 6 25 18 27 55 27 93 -2 31 25 53 30 47 1 31 46 59 30 26 9 9 0 0 31 20 31 18 27 50 28 94 -3 31 39 59 31 1 8 32 1 5 30 40 15 10 0 0 31 34 37 18 27 46 29 94 -3 31 54 5 31 15 13 32 15 11 30 54 21 11 0 0 31 48 42 18 27 41 30 95 -4 32 8 10 31 29 18 32 29 16 31 8 25 12 0 0 32 2 45 18 27 36 31 96 -5 32 22 13 31 43 21 32 43 20 31 22 28 13 0 0 32 16 47 18 27 31 31 97 -5 32 36 15 31 57 23 32 57 22 31 36 30 14 0 0 32 30 47 18 27 26 32 97 -6 32 50 16 32 11 23 33 11 22 31 50 30 15 0 0 32 44 45 18 27 21 33 98 -6 33 4 14 32 25 21 33 25 21 32 4 28 16 0 0 32 58 41 18 27 16 34 99 -7 33 18 10 32 39 17 33 39 16 32 18 24 17 0 0 33 12 34 18 27 10 34 100 -8 33 32 3 32 53 10 33 53 10 32 32 17 18 0 0 33 26 25 18 27 5 35 100 -8 33 45 53 33 7 0 34 7 0 32 46 7 19 0 0 33 40 12 18 27 0 36 101 -9 33 59 40 33 20 48 34 20 47 32 59 55 20 0 0 33 53 56 18 26 54 37 102 -10 34 13 24 33 34 32 34 34 31 33 13 39 21 0 0 34 7 36 18 26 48 38 103 -10 34 27 5 33 48 12 34 48 11 33 27 20 22 0 0 34 21 13 18 26 43 38 104 -11 34 40 41 34 1 49 35 1 47 33 40 56 23 0 0 34 34 45 18 26 37 39 105 -11 34 54 13 34 15 22 35 15 20 33 54 29 24 0 0 34 48 14 18 26 31 40 105 -12 35 7 42 34 28 50 35 28 48 34 7 58 25 0 0 35 1 37 18 26 25 40 106 -12 35 21 5 34 42 14 35 42 11 34 21 22 26 0 0 35 14 56 18 26 19 41 107 -13 35 34 24 34 55 33 35 55 30 34 34 41 27 0 0 35 28 10 18 26 13 42 108 -14 35 47 38 35 8 47 36 8 43 34 47 56 28 0 0 35 41 19 18 26 7 42 109 -14 36 0 46 35 21 56 36 21 51 35 1 5 29 0 0 35 54 23 18 26 1 43 110 -15 36 13 49 35 35 0 36 34 54 35 14 9 30 0 0 36 7 21 18 25 54 44 111 -15 36 26 47 35 47 58 36 47 52 35 27 8 31 0 0 36 20 13 18 25 48 44 112 -16 36 39 39 36 0 51 37 0 43 35 40 0 32 0 0 36 32 59 18 25 42 45 113 -16 36 52 25 36 13 37 37 13 28 35 52 47 33 0 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22 265 -9 43 19 30 42 41 30 43 40 7 42 21 6 147 0 0 42 53 11 18 14 35 22 265 -9 43 12 14 42 34 13 43 32 52 42 13 48 148 0 0 42 45 44 18 14 32 21 266 -8 43 4 47 42 26 45 43 25 25 42 6 19 149 0 0 42 38 5 18 14 30 20 267 -8 42 57 9 42 19 6 43 17 48 41 58 39 150 0 0 42 30 16 18 14 27 19 268 -7 42 49 20 42 11 15 43 10 0 41 50 48 151 0 0 42 22 15 18 14 24 19 268 -7 42 41 20 42 3 14 43 2 1 41 42 46 152 0 0 42 14 3 18 14 22 18 269 -6 42 33 9 41 55 2 42 53 51 41 34 33 153 0 0 42 5 41 18 14 19 17 270 -5 42 24 47 41 46 39 42 45 30 41 26 10 154 0 0 41 57 8 18 14 17 16 270 -5 42 16 15 41 38 5 42 36 58 41 17 35 155 0 0 41 48 24 18 14 14 16 271 -4 42 7 32 41 29 21 42 28 16 41 8 50 156 0 0 41 39 30 18 14 12 15 272 -4 41 58 38 41 20 26 42 19 23 40 59 54 157 0 0 41 30 25 18 14 10 14 273 -3 41 49 34 41 11 20 42 10 20 40 50 48 158 0 0 41 21 10 18 14 8 13 273 -3 41 40 19 41 2 4 42 1 6 40 41 31 159 0 0 41 11 44 18 14 6 13 274 -2 41 30 54 40 52 37 41 51 41 40 32 4 160 0 0 41 2 8 18 14 4 12 275 -1 41 21 19 40 43 0 41 42 7 40 22 26 161 0 0 40 52 21 18 14 2 11 275 -1 41 11 33 40 33 13 41 32 22 40 12 38 162 0 0 40 42 25 18 14 1 10 276 0 41 1 37 40 23 16 41 22 27 40 2 40 Uncertainty in time = +/- 3 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 1075-00690-1 * constellation : Aquila * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 20 00 18.4819 DE: +11 10 26.110 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .020 ) * V mag [mag]: 10.8 * B mag [mag]: 10.8 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (480) Hansa approx. diameter [km]: 59 approx. diameter ["]: .045 distance from Earth [AU]: 1.81900 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 916 number of rejected observations: 85 time covered by the observations: 1901 May 22 - 2008 Feb 13 1 sigma uncertainty ellipse (major, minor, PA): 0.021, 0.013, 70° remarks: * orbital elements for (480) Hansa : Mean anomaly = 222.02364603 deg Arg. of pericenter = 212.04322981 deg Long. of node = 237.35408259 deg Inclination = 21.27956189 deg Eccentricity = 0.04542984 Semimajor axis = 2.64567170 AU Perihelion dist = 2.52547926 AU Mag: H = 8.16, G = 0.15 Epoch of elements : MJD 55044.76500000 TDT (2009 Aug 01.765) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Aug 1 480 Hansa 18h 21.5m UT 10.8 20 0 18.482 11 10 26.11TYC 1075-00690-1 10.8 12.6 59 5.0 1.819 -2.173 -4.04 74.2151 11.176 -93.79 17.84 18.3580 -0.06593 0.52203 -6.61441 -0.83241 0.00110 -0.00266 2000 220.9322992009 728.00000212.043230237.354083 21.2795620.04542984 2.6456717 2.5254793 8.4 5.00.15 RATE 2.2903410 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.029 0.024 80 1.54 0.024 0 54545.5020090801_0690-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 11:34 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org