IOTA/IOTA-ES occultation update for (2310) Olshaniya / TYC 1294-02500-1 event on 2009 Apr 04, 00:30 UT Visible from Summary ------- On 2009 Apr 04 UT, the 33 km diameter asteroid (2310) Olshaniya will occult a 9.8 mag star in the constellation Taurus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 6.9 mag to 16.7 mag (the magnitude of the asteroid) for at most 1.0 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: 19 * date and approx. time of event: 2009 Apr 04, 00:32 - 2009 Apr 04, 00:33 UT * magnitude of target star: 9.8 * magnitude drop [mag]: 6.9 * estimated maximum duration [s]: 1.0 * Moon: 65 % sunlit, 44° distance * Sun: 64° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 34 * 1 sigma uncertainty interval [path widths]: +/- 3.47 * 1 sigma uncertainty interval [seconds]: +/- 4.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .065 +/- .056) * 1 sigma uncertainty ellipse (major, minor, PA): ( .065", .056", 83° ) * approx speed of asteroid's shadow [km/s]: 31.2060 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1294-02500-1 by 2310 Olshaniya on 2009 Apr 4 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 - 92 0 0 39 12 0 0 32 12 58 246 -1 39 2 39 39 21 20 37 58 1 40 26 26 - 91 0 0 39 7 42 0 32 14 58 248 -1 38 58 21 39 17 3 37 53 41 40 22 11 - 90 0 0 39 3 4 0 32 17 57 249 -2 38 53 43 39 12 26 37 48 59 40 17 36 - 89 0 0 38 58 5 0 32 19 56 250 -3 38 48 44 39 7 28 37 43 57 40 12 42 - 88 0 0 38 52 47 0 32 22 55 251 -4 38 43 25 39 2 9 37 38 35 40 7 26 - 87 0 0 38 47 8 0 32 24 55 252 -4 38 37 45 38 56 31 37 32 52 40 1 51 - 86 0 0 38 41 8 0 32 27 54 253 -5 38 31 45 38 50 32 37 26 48 39 55 56 - 85 0 0 38 34 48 0 32 29 53 254 -6 38 25 24 38 44 12 37 20 24 39 49 40 - 84 0 0 38 28 8 0 32 31 53 255 -7 38 18 43 38 37 32 37 13 39 39 43 4 - 83 0 0 38 21 7 0 32 34 52 256 -8 38 11 42 38 30 32 37 6 34 39 36 8 - 82 0 0 38 13 45 0 32 36 51 257 -8 38 4 20 38 23 11 36 59 7 39 28 52 - 81 0 0 38 6 3 0 32 38 50 258 -9 37 56 37 38 15 30 36 51 21 39 21 15 - 80 0 0 37 58 1 0 32 41 50 259 -10 37 48 34 38 7 28 36 43 13 39 13 18 - 79 0 0 37 49 38 0 32 43 49 260 -11 37 40 11 37 59 6 36 34 45 39 5 1 - 78 0 0 37 40 55 0 32 45 48 261 -12 37 31 27 37 50 23 36 25 56 38 56 23 - 77 0 0 37 31 51 0 32 48 47 262 -12 37 22 22 37 41 20 36 16 46 38 47 25 - 76 0 0 37 22 26 0 32 50 47 263 -13 37 12 57 37 31 56 36 7 15 38 38 7 - 75 0 0 37 12 41 0 32 52 46 264 -14 37 3 11 37 22 12 35 57 24 38 28 28 - 74 0 0 37 2 36 0 32 54 45 265 -15 36 53 4 37 12 7 35 47 12 38 18 28 - 73 0 0 36 52 9 0 32 56 44 266 -16 36 42 37 37 1 42 35 36 40 38 8 9 - 72 0 0 36 41 23 0 32 58 43 266 -17 36 31 50 36 50 56 35 25 47 37 57 29 - 71 0 0 36 30 15 0 33 1 43 267 -17 36 20 42 36 39 50 35 14 33 37 46 28 - 70 0 0 36 18 48 0 33 3 42 268 -18 36 9 13 36 28 23 35 2 58 37 35 7 - 69 0 0 36 6 59 0 33 5 41 269 -19 35 57 24 36 16 35 34 51 3 37 23 26 - 68 0 0 35 54 50 0 33 7 40 270 -20 35 45 14 36 4 27 34 38 47 37 11 24 - 67 0 0 35 42 21 0 33 9 39 270 -21 35 32 44 35 51 59 34 26 10 36 59 2 - 66 0 0 35 29 31 0 33 11 39 271 -22 35 19 53 35 39 10 34 13 13 36 46 20 - 65 0 0 35 16 21 0 33 13 38 272 -22 35 6 42 35 26 1 33 59 56 36 33 17 - 64 0 0 35 2 50 0 33 15 37 273 -23 34 53 10 35 12 31 33 46 18 36 19 54 - 63 0 0 34 48 59 0 33 17 36 273 -24 34 39 18 34 58 41 33 32 20 36 6 10 - 62 0 0 34 34 48 0 33 18 35 274 -25 34 25 6 34 44 31 33 18 1 35 52 7 - 61 0 0 34 20 17 0 33 20 34 275 -26 34 10 34 34 30 0 33 3 22 35 37 43 - 60 0 0 34 5 25 0 33 22 34 275 -27 33 55 42 34 15 10 32 48 23 35 23 0 - 59 0 0 33 50 14 0 33 24 33 276 -27 33 40 29 33 59 59 32 33 4 35 7 56 - 58 0 0 33 34 42 0 33 26 32 277 -28 33 24 56 33 44 29 32 17 24 34 52 32 - 57 0 0 33 18 51 0 33 27 31 277 -29 33 9 4 33 28 38 32 1 25 34 36 49 - 56 0 0 33 2 40 0 33 29 30 278 -30 32 52 52 33 12 28 31 45 7 34 20 45 - 55 0 0 32 46 9 0 33 31 29 279 -31 32 36 20 32 55 58 31 28 28 34 4 22 - 54 0 0 32 29 19 0 33 32 28 279 -32 32 19 29 32 39 9 31 11 30 33 47 40 - 53 0 0 32 12 9 0 33 34 27 280 -33 32 2 18 32 22 0 30 54 13 33 30 38 - 52 0 0 31 54 40 0 33 35 27 280 -34 31 44 49 32 4 32 30 36 36 33 13 17 - 51 0 0 31 36 52 0 33 37 26 281 -34 31 27 0 31 46 45 30 18 41 32 55 37 - 50 0 0 31 18 45 0 33 38 25 282 -35 31 8 52 31 28 40 30 0 27 32 37 38 - 49 0 0 31 0 20 0 33 40 24 282 -36 30 50 25 31 10 15 29 41 54 32 19 20 - 48 0 0 30 41 36 0 33 41 23 283 -37 30 31 40 30 51 32 29 23 2 32 0 43 - 47 0 0 30 22 34 0 33 42 22 283 -38 30 12 37 30 32 31 29 3 53 31 41 49 - 46 0 0 30 3 13 0 33 44 21 284 -39 29 53 16 30 13 11 28 44 25 31 22 36 - 45 0 0 29 43 35 0 33 45 20 284 -40 29 33 37 29 53 34 28 24 40 31 3 5 - 44 0 0 29 23 39 0 33 46 19 285 -41 29 13 40 29 33 39 28 4 37 30 43 16 - 43 0 0 29 3 26 0 33 47 18 285 -41 28 53 26 29 13 27 27 44 17 30 23 10 - 42 0 0 28 42 56 0 33 48 17 286 -42 28 32 56 28 52 58 27 23 41 30 2 47 - 41 0 0 28 22 10 0 33 49 16 286 -43 28 12 8 28 32 12 27 2 47 29 42 7 - 40 0 0 28 1 7 0 33 50 15 287 -44 27 51 4 28 11 10 26 41 38 29 21 11 - 39 0 0 27 39 47 0 33 51 15 287 -45 27 29 44 27 49 51 26 20 12 28 59 58 - 38 0 0 27 18 13 0 33 52 14 288 -46 27 8 8 27 28 17 25 58 31 28 38 29 - 37 0 0 26 56 22 0 33 53 13 288 -47 26 46 17 27 6 28 25 36 35 28 16 45 - 36 0 0 26 34 17 0 33 54 12 289 -48 26 24 11 26 44 23 25 14 24 27 54 45 - 35 0 0 26 11 57 0 33 54 11 289 -49 26 1 51 26 22 4 24 51 59 27 32 31 - 34 0 0 25 49 23 0 33 55 10 290 -50 25 39 16 25 59 30 24 29 19 27 10 2 - 33 0 0 25 26 35 0 33 55 9 290 -50 25 16 28 25 36 43 24 6 26 26 47 20 - 32 0 0 25 3 34 0 33 56 8 291 -51 24 53 26 25 13 43 23 43 20 26 24 24 - 31 0 0 24 40 20 0 33 56 7 291 -52 24 30 11 24 50 29 23 20 2 26 1 14 - 30 0 0 24 16 53 0 33 57 6 291 -53 24 6 44 24 27 3 22 56 31 25 37 52 - 29 0 0 23 53 15 0 33 57 5 292 -54 23 43 5 24 3 25 22 32 48 25 14 18 - 28 0 0 23 29 24 0 33 57 4 292 -55 23 19 14 23 39 35 .. .. .. 24 50 31 - 27 0 0 23 5 23 0 33 58 3 293 -56 22 55 13 23 15 35 .. .. .. 24 26 34 - 26 0 0 22 41 12 0 33 58 2 293 -57 22 31 1 22 51 24 .. .. .. 24 2 26 - 25 0 0 22 16 51 0 33 58 1 293 -57 22 6 39 22 27 3 .. .. .. 23 38 8 Uncertainty in time = +/- 4 secs [Prediction of 2008 Apr 25.0] Data for the target star ------------------------ * name: TYC 1294-02500-1 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 09 04.9124 DE: +21 51 47.226 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .024, .039 ) * V mag [mag]: 9.8 * B mag [mag]: 11.8 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2310) Olshaniya approx. diameter [km]: 33 approx. diameter ["]: .016 distance from Earth [AU]: 2.93200 * orbital information: orbit source: Preston date of fit: 2008 Apr 24 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 689 number of rejected observations: 33 time covered by the observations: 1959 Jan 31 - 2008 Jan 01 1 sigma uncertainty ellipse (major, minor, PA): 0.060, 0.040, 82° remarks: * orbital elements for (2310) Olshaniya : Mean anomaly = 1.51064468 deg Arg. of pericenter = 331.72384545 deg Long. of node = 124.16885133 deg Inclination = 2.64895781 deg Eccentricity = 0.15791016 Semimajor axis = 3.14718374 AU Perihelion dist = 2.65021144 AU Mag: H = 11.52, G = 0.15 Epoch of elements : MJD 54925.02100000 TDT (2009 Apr 04.021) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Apr 4 2310 Olshaniya 0h 30.7m UT 9.8 5 9 4.912 21 51 47.23TYC 1294-02500-1 11.8 16.7 33 1.0 2.932 3.764 6.63 -122.8692 21.862 173.10 5.67 0.5116 -0.03676 0.28043 17.47417 2.21127 0.00508 0.00040 2000 0.6242832009 330.00000331.723845124.168851 2.6489580.15791016 3.1471837 2.650211511.3 5.00.15 RATE 1.7653100 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.065 0.056 83 4.47 0.054 0 54581.5020090404_2500-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 25, 06:17 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org