IOTA/IOTA-ES occultation update for (860) Ursina / TYC 2911-00219-1 event on 2009 Nov 09, 20:42 UT Visible from Summary ------- On 2009 Nov 09 UT, the 29 km diameter asteroid (860) Ursina will occult a 12.3 mag star in the constellation Auriga for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.7 mag to 14.9 mag (the magnitude of the asteroid) for at most 4.1 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: 38 * date and approx. time of event: 2009 Nov 09, 20:31 - 2009 Nov 09, 20:57 UT * magnitude of target star: 12.3 * magnitude drop [mag]: 2.7 * estimated maximum duration [s]: 4.1 * Moon: 48 % sunlit, 55° distance * Sun: 137° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 29 * 1 sigma uncertainty interval [path widths]: +/- 1.72 * 1 sigma uncertainty interval [seconds]: +/- 5.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .036 +/- .034) * 1 sigma uncertainty ellipse (major, minor, PA): ( .036", .034", 97° ) * approx speed of asteroid's shadow [km/s]: 7.1012 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 2911-00219-1 by 860 Ursina on 2009 Nov 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 - 19 0 0 15 30 21 20 57 30 0 49 -32 15 40 46 .. .. .. 16 16 36 .. .. .. - 18 0 0 16 20 1 20 57 30 1 50 -33 16 30 24 16 9 38 17 6 10 15 33 56 - 17 0 0 17 9 12 20 57 29 3 50 -34 17 19 33 16 58 50 17 55 14 16 23 14 - 16 0 0 17 57 52 20 57 28 4 50 -35 18 8 12 17 47 32 18 43 48 17 12 2 - 15 0 0 18 46 1 20 57 26 5 51 -36 18 56 19 18 35 43 19 31 49 18 0 18 - 14 0 0 19 33 36 20 57 24 6 51 -37 19 43 53 19 23 20 20 19 16 18 48 1 - 13 0 0 20 20 37 20 57 22 7 51 -38 20 30 51 20 10 22 21 6 8 19 35 10 - 12 0 0 21 7 1 20 57 19 9 52 -39 21 17 14 20 56 49 21 52 24 20 21 44 - 11 0 0 21 52 49 20 57 16 10 52 -40 22 3 0 21 42 38 22 38 2 21 7 40 - 10 0 0 22 37 58 20 57 13 11 52 -41 22 48 7 22 27 50 23 23 2 21 52 59 - 9 0 0 23 22 29 20 57 9 12 53 -42 23 32 35 23 12 23 24 7 23 22 37 40 - 8 0 0 24 6 20 20 57 5 13 53 -43 24 16 24 23 56 16 24 51 4 23 21 40 - 7 0 0 24 49 30 20 57 0 15 54 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284 -22 37 26 8 37 7 57 37 57 26 36 36 43 123 0 0 36 49 33 20 36 17 63 285 -21 36 58 40 36 40 25 37 30 7 36 9 3 124 0 0 36 21 24 20 36 4 62 286 -20 36 30 34 36 12 14 37 2 9 35 40 44 125 0 0 35 52 36 20 35 51 61 287 -19 36 1 49 35 43 24 36 33 31 35 11 46 126 0 0 35 23 9 20 35 39 61 288 -19 35 32 24 35 13 55 36 4 15 34 42 9 127 0 0 34 53 3 20 35 26 60 289 -18 35 2 20 34 43 46 35 34 19 34 11 52 128 0 0 34 22 16 20 35 13 59 290 -17 34 31 36 34 12 57 35 3 43 33 40 55 129 0 0 33 50 50 20 35 1 58 291 -16 34 0 12 33 41 28 34 32 28 33 9 18 130 0 0 33 18 44 20 34 48 57 292 -15 33 28 8 33 9 20 34 0 32 32 37 1 131 0 0 32 45 57 20 34 35 56 293 -14 32 55 24 32 36 31 33 27 56 32 4 4 132 0 0 32 12 30 20 34 22 55 293 -13 32 22 0 32 3 1 32 54 39 31 30 26 133 0 0 31 38 23 20 34 10 54 294 -12 31 47 55 31 28 52 32 20 43 30 56 9 134 0 0 31 3 36 20 33 57 53 295 -12 31 13 10 30 54 2 31 46 6 30 21 11 135 0 0 30 28 8 20 33 44 52 296 -11 30 37 44 30 18 32 31 10 48 29 45 33 136 0 0 29 52 0 20 33 32 51 296 -10 30 1 39 29 42 22 30 34 51 29 9 15 137 0 0 29 15 12 20 33 19 50 297 -9 29 24 53 29 5 32 29 58 13 28 32 17 138 0 0 28 37 45 20 33 7 49 298 -8 28 47 28 28 28 2 29 20 55 27 54 39 139 0 0 27 59 37 20 32 54 48 298 -7 28 9 22 27 49 52 28 42 58 27 16 22 140 0 0 27 20 51 20 32 42 47 299 -6 27 30 38 27 11 3 28 4 21 26 37 26 141 0 0 26 41 25 20 32 29 46 300 -5 26 51 15 26 31 36 27 25 5 25 57 50 142 0 0 26 1 21 20 32 17 45 300 -4 26 11 13 25 51 30 26 45 10 25 17 37 143 0 0 25 20 39 20 32 5 44 301 -3 25 30 33 25 10 45 26 4 37 24 36 46 144 0 0 24 39 19 20 31 53 43 301 -2 24 49 15 24 29 24 25 23 27 23 55 17 145 0 0 23 57 23 20 31 41 42 302 -1 24 7 20 23 47 25 24 41 39 23 13 12 Uncertainty in time = +/- 7 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 2911-00219-1 * constellation : Auriga * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 48 34.0431 DE: +38 52 21.373 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .024, .030 ) * V mag [mag]: 12.3 * B mag [mag]: 12.3 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (860) Ursina approx. diameter [km]: 29 approx. diameter ["]: .020 distance from Earth [AU]: 2.03200 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 715 number of rejected observations: 51 time covered by the observations: 1903 Jan 18 - 2007 Aug 13 1 sigma uncertainty ellipse (major, minor, PA): 0.027, 0.017, 102° remarks: * orbital elements for (860) Ursina : Mean anomaly = 92.56954434 deg Arg. of pericenter = 19.47419513 deg Long. of node = 309.48896483 deg Inclination = 13.32444641 deg Eccentricity = 0.10771973 Semimajor axis = 2.79506887 AU Perihelion dist = 2.49398481 AU Mag: H = 9.82, G = 0.15 Epoch of elements : MJD 55144.86300000 TDT (2009 Nov 09.863) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Nov 9 860 Ursina 20h 42.7m UT 12.3 5 48 34.043 38 52 21.37TYC 2911-00219-1 12.3 14.9 29 4.1 2.032 -1.455 3.60 87.3229 38.872 -134.69 -17.08 20.7111 0.02940 0.13514 -3.92084 0.83182 -0.00380 -0.00127 2000 91.543846200911 5.00000 19.474195309.488965 13.3244460.10771973 2.7950689 2.493984810.3 5.00.15 RATE 2.1091880 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.036 0.034 97 2.72 0.034 0 54545.5020091109_0219-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 16:21 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org