IOTA/IOTA-ES occultation update for (466) Tisiphone / 2UCAC 19503168 event on 2008 Jul 09, 17:39 UT Visible from S Australia, Africa Summary ------- On 2008 Jul 09 UT, the 116 km diameter asteroid (466) Tisiphone will occult a 12.5 mag star in the constellation Sagittarius for observers along a path across S Australia, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.2 mag to 13.2 mag (the magnitude of the asteroid) for at most 8.0 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: 75 * date and approx. time of event: 2008 Jul 09, 17:32 - 2008 Jul 09, 17:46 UT * midpoint of event [JD]: 2454657.23570833 * magnitude of target star: 12.5 * magnitude drop [mag]: 1.2 * estimated maximum duration [s]: 8.0 * Moon: 46 % sunlit, 81° distance * Sun: 165° distance * rough path description: S Australia, Africa The occultation path -------------------- * approximate projected width [km]: 116 * 1 sigma uncertainty interval [path widths]: +/- 0.76 * 1 sigma uncertainty interval [seconds]: +/- 7.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .070 +/- .047) * 1 sigma uncertainty ellipse (major, minor, PA): ( .070", .047", 88° ) * approx speed of asteroid's shadow [km/s]: 14.4052 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 19503168 by 466 Tisiphone on 2008 Jul 9 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 11 0 0 13 38 14 17 46 41 10 124 -1 14 16 7 13 0 22 15 13 45 12 2 48 12 0 0 12 58 42 17 46 39 12 124 -2 13 36 41 12 20 44 14 34 26 11 23 2 13 0 0 12 18 46 17 46 37 13 125 -3 12 56 50 11 40 43 13 54 43 10 42 54 14 0 0 11 38 28 17 46 35 14 125 -4 12 16 37 11 0 20 13 14 37 10 2 23 15 0 0 10 57 49 17 46 33 15 125 -5 11 36 2 10 19 36 12 34 9 9 21 33 16 0 0 10 16 49 17 46 30 16 125 -6 10 55 7 9 38 33 11 53 21 8 40 23 17 0 0 9 35 31 17 46 27 17 125 -8 10 13 53 8 57 11 11 12 13 7 58 55 18 0 0 8 53 56 17 46 25 19 125 -9 9 32 21 8 15 32 10 30 46 7 17 10 19 0 0 8 12 4 17 46 21 20 126 -10 8 50 33 7 33 37 9 49 3 6 35 10 20 0 0 7 29 58 17 46 18 21 126 -11 8 8 30 6 51 28 9 7 5 5 52 57 21 0 0 6 47 39 17 46 15 22 126 -12 7 26 13 6 9 6 8 24 52 5 10 31 22 0 0 6 5 8 17 46 11 23 126 -13 6 43 44 5 26 33 7 42 27 4 27 54 23 0 0 5 22 27 17 46 7 25 126 -15 6 1 5 4 43 49 6 59 51 3 45 8 24 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-25 -25 35 40 -26 45 10 -24 42 48 -27 37 59 171 0 0 -25 44 29 17 32 17 15 244 -24 -25 9 36 -26 19 22 -24 16 32 -27 12 23 172 0 0 -25 17 56 17 32 15 14 244 -23 -24 42 55 -25 52 57 -23 49 38 -26 46 11 173 0 0 -24 50 46 17 32 14 13 243 -22 -24 15 36 -25 25 55 -23 22 8 -26 19 21 174 0 0 -24 22 59 17 32 12 12 243 -21 -23 47 41 -24 58 16 -22 54 0 -25 51 54 175 0 0 -23 54 34 17 32 10 11 242 -20 -23 19 8 -24 30 0 -22 25 15 -25 23 50 176 0 0 -23 25 32 17 32 9 10 242 -19 -22 49 58 -24 1 6 -21 55 52 -24 55 9 177 0 0 -22 55 53 17 32 8 9 241 -18 -22 20 11 -23 31 36 -21 25 52 -24 25 51 178 0 0 -22 25 37 17 32 7 8 241 -17 -21 49 46 -23 1 28 -20 55 14 -23 55 56 179 0 0 -21 54 44 17 32 5 7 241 -16 -21 18 44 -22 30 43 -20 24 0 -23 25 23 180 0 0 -21 23 13 17 32 5 6 240 -15 -20 47 6 -21 59 21 -19 52 9 -22 54 14 -179 0 0 -20 51 6 17 32 4 4 240 -14 -20 14 50 -21 27 22 -19 19 40 -22 22 28 -178 0 0 -20 18 23 17 32 3 3 240 -13 -19 41 58 -20 54 47 -18 46 35 -21 50 5 -177 0 0 -19 45 2 17 32 3 2 239 -12 -19 8 29 -20 21 35 -18 12 54 -21 17 6 -176 0 0 -19 11 6 17 32 3 1 239 -11 -18 34 25 -19 47 47 -17 38 37 -20 43 31 -175 0 0 -18 36 34 17 32 3 0 239 -10 .. .. .. -19 13 23 .. .. .. -20 9 19 Uncertainty in time = +/- 8 secs [Prediction of 2008 Jun 6.0] Data for the target star ------------------------ * name: 2UCAC 19503168 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 20 11.7254 DE: -29 35 11.702 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .067, .045 ) * V mag [mag]: 12.5 * B mag [mag]: 0.0 * Apparent position with proper motion RA(deg): 275.1948630794 DE(deg): -29.5840327995 * Equation of equinoxes (radians) : 0.000051143759847 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (466) Tisiphone approx. diameter [km]: 116 approx. diameter ["]: .067 distance from Earth [AU]: 2.39400 * orbital information: orbit source: Preston date of fit: 2008 Jun 04 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 772 number of rejected observations: 76 time covered by the observations: 1901 Jan 19 - 2008 May 21 1 sigma uncertainty ellipse (major, minor, PA): 0.023, 0.014, 70° remarks: * orbital elements for (466) Tisiphone : Mean anomaly = 89.54196592 deg Arg. of pericenter = 247.40154432 deg Long. of node = 291.16739908 deg Inclination = 19.17210411 deg Eccentricity = 0.08378827 Semimajor axis = 3.36648439 AU Perihelion dist = 3.08441250 AU Mag: H = 8.39, G = 0.15 Epoch of elements : MJD 54656.73600000 TDT (2008 Jul 09.736) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jul 9 466 Tisiphone 17h 39.4m UT 12.5 18 20 11.725-29 35 11.702UCAC 19503168 0.0 13.2 116 8.0 2.394 -2.125 11.08 82.1636 -29.590 -83.52 22.25 17.6570 0.00260 0.00711 -7.55056 3.01616 0.00132 0.00065 2000 88.4671322008 7 3.00000247.401544291.167399 19.1721040.08378827 3.3664844 3.0844125 8.3 5.00.15 RATE 1.5956560 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.070 0.047 88 1.76 0.051 0 54623.5020080709_503168 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jun 06, 21:55 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org