IOTA/IOTA-ES occultation update for (566) Stereoskopia / TYC 1400-02264-1 event on 2009 May 11, 01:25 UT Visible from Summary ------- On 2009 May 11 UT, the 173 km diameter asteroid (566) Stereoskopia will occult a 10.9 mag star in the constellation Cancer for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 3.6 mag to 14.5 mag (the magnitude of the asteroid) for at most 9.2 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 May 11, 01:25 - 2009 May 11, 01:29 UT * magnitude of target star: 10.9 * magnitude drop [mag]: 3.6 * estimated maximum duration [s]: 9.2 * Moon: 96 % sunlit, 120° distance * Sun: 82° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 268 * 1 sigma uncertainty interval [path widths]: +/- 0.32 * 1 sigma uncertainty interval [seconds]: +/- 3.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .023 +/- .021) * 1 sigma uncertainty ellipse (major, minor, PA): ( .023", .021", 96° ) * approx speed of asteroid's shadow [km/s]: 18.7963 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1400-02264-1 by 566 Stereoskopia on 2009 May 11 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 ' " Longitude Longitude Longitude Longitude - 14 40 21 27 0 0 1 29 6 1 294 -44 - 17 47 57 ... .. .. - 19 40 51 ... .. .. - 17 0 33 28 0 0 1 29 5 3 293 -44 - 19 59 29 - 13 47 9 - 21 47 55 ... .. .. Latitude Latitude Latitude Latitude - 19 0 0 28 54 16 1 29 4 5 292 -43 27 32 27 30 18 49 26 41 22 31 14 31 - 20 0 0 29 22 37 1 29 3 6 291 -43 28 0 15 30 47 46 27 8 51 31 43 52 - 21 0 0 29 51 40 1 29 2 7 291 -42 28 28 45 31 17 26 27 37 1 32 13 58 - 22 0 0 30 21 26 1 29 1 8 290 -42 28 57 56 31 47 50 28 5 52 32 44 49 - 23 0 0 30 51 54 1 29 0 9 290 -41 29 27 49 32 18 57 28 35 24 33 16 23 - 24 0 0 31 23 3 1 28 58 10 289 -41 29 58 22 32 50 46 29 5 35 33 48 41 - 25 0 0 31 54 54 1 28 56 11 289 -40 30 29 35 33 23 18 29 36 27 34 21 41 - 26 0 0 32 27 24 1 28 55 12 288 -40 31 1 28 33 56 30 30 7 57 34 55 24 - 27 0 0 33 0 34 1 28 53 13 287 -39 31 33 59 34 30 24 30 40 5 35 29 48 - 28 0 0 33 34 24 1 28 50 14 287 -38 32 7 8 35 4 58 31 12 51 36 4 53 - 29 0 0 34 8 51 1 28 48 15 286 -38 32 40 55 35 40 10 31 46 14 36 40 37 - 30 0 0 34 43 56 1 28 46 16 286 -37 33 15 19 36 16 1 32 20 13 37 17 1 - 31 0 0 35 19 37 1 28 43 17 285 -36 33 50 18 36 52 30 32 54 48 37 54 3 - 32 0 0 35 55 53 1 28 40 18 284 -36 34 25 51 37 29 34 33 29 56 38 31 42 - 33 0 0 36 32 44 1 28 37 19 283 -35 35 1 59 38 7 15 34 5 38 39 9 57 - 34 0 0 37 10 9 1 28 34 19 283 -34 35 38 38 38 45 29 34 41 52 39 48 47 - 35 0 0 37 48 5 1 28 31 20 282 -33 36 15 50 39 24 16 35 18 37 40 28 10 - 36 0 0 38 26 32 1 28 28 21 281 -33 36 53 31 40 3 34 35 55 52 41 8 6 - 37 0 0 39 5 28 1 28 24 22 280 -32 37 31 42 40 43 23 36 33 35 41 48 32 - 38 0 0 39 44 53 1 28 20 23 279 -31 38 10 20 41 23 41 37 11 46 42 29 27 - 39 0 0 40 24 44 1 28 17 24 279 -30 38 49 24 42 4 25 37 50 23 43 10 50 - 40 0 0 41 5 0 1 28 13 25 278 -29 39 28 52 42 45 35 38 29 25 43 52 39 - 41 0 0 41 45 39 1 28 9 26 277 -28 40 8 44 43 27 9 39 8 49 44 34 52 - 42 0 0 42 26 40 1 28 5 26 276 -27 40 48 57 44 9 4 39 48 34 45 17 27 - 43 0 0 43 8 0 1 28 0 27 275 -26 41 29 30 44 51 19 40 28 39 46 0 22 - 44 0 0 43 49 38 1 27 56 28 274 -25 42 10 20 45 33 52 41 9 2 46 43 36 - 45 0 0 44 31 32 1 27 52 29 273 -25 42 51 26 46 16 41 41 49 41 47 27 5 - 46 0 0 45 13 40 1 27 47 30 272 -24 43 32 46 46 59 44 42 30 34 48 10 47 - 47 0 0 45 55 59 1 27 42 30 270 -23 44 14 18 47 42 58 43 11 39 48 54 41 - 48 0 0 46 38 27 1 27 38 31 269 -22 44 56 1 48 26 21 43 52 54 49 38 44 - 49 0 0 47 21 3 1 27 33 32 268 -21 45 37 50 49 9 50 44 34 18 50 22 53 - 50 0 0 48 3 44 1 27 28 32 267 -20 46 19 46 49 53 24 45 15 47 51 7 6 - 51 0 0 48 46 27 1 27 23 33 266 -19 47 1 44 50 36 59 45 57 21 51 51 19 - 52 0 0 49 29 10 1 27 18 34 264 -18 47 43 44 51 20 33 46 38 56 52 35 31 - 53 0 0 50 11 51 1 27 13 34 263 -17 48 25 43 52 4 4 47 20 31 53 19 39 - 54 0 0 50 54 27 1 27 8 35 262 -16 49 7 38 52 47 28 48 2 3 54 3 39 - 55 0 0 51 36 56 1 27 3 35 260 -15 49 49 27 53 30 43 48 43 30 54 47 30 - 56 0 0 52 19 15 1 26 58 36 259 -14 50 31 9 54 13 48 49 24 50 55 31 7 - 57 0 0 53 1 22 1 26 53 36 258 -13 51 12 40 54 56 37 50 6 0 56 14 29 - 58 0 0 53 43 14 1 26 48 37 256 -12 51 53 58 55 39 10 50 46 59 56 57 33 - 59 0 0 54 24 50 1 26 43 37 255 -11 52 35 1 56 21 24 51 27 44 57 40 15 - 60 0 0 55 6 5 1 26 38 37 253 -11 53 15 47 57 3 15 52 8 13 58 22 34 - 61 0 0 55 46 59 1 26 33 38 252 -10 53 56 13 57 44 42 52 48 24 59 4 26 - 62 0 0 56 27 29 1 26 28 38 250 -9 54 36 18 58 25 42 53 28 15 59 45 49 - 63 0 0 57 7 33 1 26 23 38 249 -8 55 15 59 59 6 13 54 7 43 60 26 40 - 64 0 0 57 47 8 1 26 18 39 247 -7 55 55 14 59 46 12 54 46 47 61 6 57 - 65 0 0 58 26 13 1 26 13 39 246 -6 56 34 2 60 25 38 55 25 26 61 46 38 - 66 0 0 59 4 45 1 26 8 39 244 -5 57 12 20 61 4 27 56 3 36 62 25 41 - 67 0 0 59 42 44 1 26 3 39 243 -5 57 50 7 61 42 39 56 41 17 63 4 3 - 68 0 0 60 20 6 1 25 58 39 241 -4 58 27 21 62 20 11 57 18 26 63 41 43 - 69 0 0 60 56 51 1 25 54 40 240 -3 59 4 1 62 57 2 57 55 3 64 18 39 - 70 0 0 61 32 57 1 25 49 40 238 -2 59 40 5 63 33 11 58 31 6 64 54 50 - 71 0 0 62 8 23 1 25 45 40 237 -1 60 15 32 64 8 36 59 6 33 65 30 14 - 72 0 0 62 43 7 1 25 40 40 235 -1 60 50 21 64 43 15 59 41 24 66 4 50 Uncertainty in time = +/- 3 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 1400-02264-1 * constellation : Cancer * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 09 02 59.8859 DE: +21 33 12.635 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .017, .018 ) * V mag [mag]: 10.9 * B mag [mag]: 12.1 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (566) Stereoskopia approx. diameter [km]: 173 approx. diameter ["]: .066 distance from Earth [AU]: 3.62500 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 709 number of rejected observations: 154 time covered by the observations: 1905 Jun 04 - 2008 Feb 18 1 sigma uncertainty ellipse (major, minor, PA): 0.015, 0.011, 104° remarks: * orbital elements for (566) Stereoskopia : Mean anomaly = 123.30721430 deg Arg. of pericenter = 294.65032040 deg Long. of node = 80.25553359 deg Inclination = 4.89776163 deg Eccentricity = 0.11159467 Semimajor axis = 3.38444868 AU Perihelion dist = 3.00676226 AU Mag: H = 7.85, G = 0.15 Epoch of elements : MJD 54962.06000000 TDT (2009 May 11.060) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 May 11 566 Stereoskopia 1h 25.5m UT 10.9 9 2 59.886 21 33 12.64TYC 1400-02264-1 12.1 14.5 173 9.2 3.625 1.721 -9.28 -114.5862 21.557 157.73 17.88 1.4242 0.27429 0.71321 9.89511 -3.82634 0.00547 -0.00156 2000 122.9811232009 5 9.00000294.650320 80.255534 4.8977620.11159467 3.3844487 3.0067622 8.0 5.00.15 RATE 1.5829680 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.023 0.021 96 1.32 0.021 0 54545.5020090511_2264-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 08:09 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org