IOTA/IOTA-ES occultation update for (423) Diotima / TYC 1252-00803-1 event on 2009 Dec 06, 07:36 UT Visible from S USA Summary ------- On 2009 Dec 06 UT, the 209 km diameter asteroid (423) Diotima will occult a 10.9 mag star in the constellation Taurus for observers along a path across S USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.3 mag to 11.9 mag (the magnitude of the asteroid) for at most 15.5 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: UCAC. The event at a glimpse ---------------------- * Rank: 99 * date and approx. time of event: 2009 Dec 06, 07:28 - 2009 Dec 06, 07:43 UT * midpoint of event [JD]: 2455171.81680417 * magnitude of target star: 10.9 * magnitude drop [mag]: 1.3 * estimated maximum duration [s]: 15.5 * Moon: 79 % sunlit, 70° distance * Sun: 165° distance * rough path description: S USA The occultation path -------------------- * approximate projected width [km]: 218 * 1 sigma uncertainty interval [path widths]: +/- 0.18 * 1 sigma uncertainty interval [seconds]: +/- 3.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .029 +/- .023) * 1 sigma uncertainty ellipse (major, minor, PA): ( .029", .023", 78° ) * approx speed of asteroid's shadow [km/s]: 13.4692 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1252-00803-1 by 423 Diotima on 2009 Dec 6 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 143 0 0 22 12 52 7 43 33 13 75 -1 23 15 22 21 10 43 23 37 57 20 48 25 144 0 0 22 31 46 7 43 31 14 75 -2 23 34 14 21 29 39 23 56 48 21 7 22 145 0 0 22 50 32 7 43 29 15 76 -3 23 52 57 21 48 27 24 15 31 21 26 10 146 0 0 23 9 8 7 43 27 16 76 -4 24 11 31 22 7 5 24 34 4 21 44 50 147 0 0 23 27 35 7 43 24 17 77 -5 24 29 56 22 25 34 24 52 28 22 3 20 148 0 0 23 45 52 7 43 22 17 77 -5 24 48 11 22 43 54 25 10 42 22 21 40 149 0 0 24 3 59 7 43 19 18 77 -6 25 6 15 23 2 4 25 28 45 22 39 51 150 0 0 24 21 56 7 43 17 19 78 -7 25 24 9 23 20 3 25 46 39 22 57 51 151 0 0 24 39 42 7 43 14 20 78 -8 25 41 53 23 37 52 26 4 21 23 15 41 152 0 0 24 57 17 7 43 11 21 79 -9 25 59 25 23 55 30 26 21 53 23 33 20 153 0 0 25 14 42 7 43 8 22 79 -10 26 16 47 24 12 57 26 39 13 23 50 48 154 0 0 25 31 54 7 43 5 23 80 -11 26 33 56 24 30 12 26 56 22 24 8 5 155 0 0 25 48 55 7 43 2 24 80 -12 26 50 54 24 47 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18 37 57 7 28 53 14 285 -29 19 40 39 17 35 36 20 3 18 17 13 14 - 48 0 0 18 17 56 7 28 51 13 285 -28 19 20 38 17 15 34 19 43 18 16 53 12 - 47 0 0 17 57 51 7 28 49 12 286 -27 19 0 34 16 55 29 19 23 14 16 33 7 - 46 0 0 17 37 43 7 28 48 11 286 -26 18 40 26 16 35 21 19 3 6 16 12 59 - 45 0 0 17 17 33 7 28 46 10 286 -25 18 20 16 16 15 11 18 42 56 15 52 48 - 44 0 0 16 57 20 7 28 45 9 287 -24 18 0 3 15 54 58 18 22 43 15 32 35 - 43 0 0 16 37 5 7 28 43 8 287 -23 17 39 48 15 34 43 18 2 28 15 12 21 - 42 0 0 16 16 49 7 28 42 7 287 -22 17 19 32 15 14 27 17 42 12 14 52 5 - 41 0 0 15 56 32 7 28 41 6 287 -21 16 59 14 14 54 11 17 21 54 14 31 48 - 40 0 0 15 36 14 7 28 40 5 288 -20 16 38 56 14 33 53 17 1 36 14 11 31 - 39 0 0 15 15 56 7 28 40 4 288 -19 16 18 37 14 13 36 16 41 17 13 51 15 - 38 0 0 14 55 39 7 28 39 3 288 -18 15 58 19 13 53 20 16 20 58 13 30 58 - 37 0 0 14 35 23 7 28 39 2 289 -17 15 38 2 13 33 4 16 0 41 13 10 43 - 36 0 0 14 15 7 7 28 38 1 289 -16 15 17 46 13 12 50 15 40 24 12 50 29 Uncertainty in time = +/- 3 secs [Prediction of 2008 Apr 28.0] Data for the target star ------------------------ * name: TYC 1252-00803-1 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 03 49 38.0868 DE: +18 24 46.217 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .021 ) * V mag [mag]: 10.9 * B mag [mag]: 11.4 * Apparent position with proper motion RA(deg): 57.5613879696 DE(deg): 18.4453448405 * Equation of equinoxes (radians) : 0.000067620270099 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (423) Diotima approx. diameter [km]: 209 approx. diameter ["]: .130 distance from Earth [AU]: 2.20900 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1117 number of rejected observations: 116 time covered by the observations: 1904 Mar 12 - 2007 Aug 07 1 sigma uncertainty ellipse (major, minor, PA): 0.021, 0.011, 66° remarks: * orbital elements for (423) Diotima : Mean anomaly = 149.05428966 deg Arg. of pericenter = 202.91788953 deg Long. of node = 69.51768601 deg Inclination = 11.23328978 deg Eccentricity = 0.03971219 Semimajor axis = 3.06569672 AU Perihelion dist = 2.94395119 AU Mag: H = 7.14, G = 0.15 Epoch of elements : MJD 55171.31700000 TDT (2009 Dec 06.317) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Dec 6 423 Diotima 7h 36.2m UT 10.9 3 49 38.087 18 24 46.22TYC 1252-00803-1 11.4 11.9 209 15.5 2.209 -2.124 1.13 -131.8684 18.413 63.71 -22.52 7.6033 0.01042 0.28819 -7.59710 0.28371 0.00144 0.00049 2000 148.812468200912 5.00000202.917890 69.517686 11.2332900.03971219 3.0656967 2.9439512 7.2 5.00.15 RATE 1.8361590 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.029 0.023 78 1.18 0.024 0 54584.5020091206_0803-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 28, 04:22 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org