IOTA/IOTA-ES occultation update for (322) Phaeo / TYC 0238-02251-1 event on 2009 Apr 02, 21:54 UT Visible from Summary ------- On 2009 Apr 02 UT, the 71 km diameter asteroid (322) Phaeo will occult a 11.0 mag star in the constellation Hydra for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 3.5 mag to 14.4 mag (the magnitude of the asteroid) for at most 10.7 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: 79 * date and approx. time of event: 2009 Apr 02, 21:39 - 2009 Apr 02, 22:07 UT * magnitude of target star: 11.0 * magnitude drop [mag]: 3.5 * estimated maximum duration [s]: 10.7 * Moon: 53 % sunlit, 41° distance * Sun: 131° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 71 * 1 sigma uncertainty interval [path widths]: +/- 0.69 * 1 sigma uncertainty interval [seconds]: +/- 7.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .028 +/- .025) * 1 sigma uncertainty ellipse (major, minor, PA): ( .028", .025", 99° ) * approx speed of asteroid's shadow [km/s]: 6.5971 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0238-02251-1 by 322 Phaeo on 2009 Apr 2 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 71 41 54 -44 0 0 21 39 7 2 277 -40 ... .. .. 68 33 6 ... .. .. 65 11 30 63 47 38 -43 0 0 21 39 16 8 282 -45 65 53 52 61 54 44 69 23 27 59 34 25 Latitude Latitude Latitude Latitude 62 0 0 -42 41 10 21 39 19 9 283 -46 -42 21 21 -43 0 58 -41 54 0 -43 28 17 61 0 0 -42 29 48 21 39 21 10 284 -47 -42 9 56 -42 49 40 -41 42 29 -43 17 4 60 0 0 -42 17 49 21 39 24 11 285 -47 -41 57 52 -42 37 45 -41 30 21 -43 5 14 59 0 0 -42 5 12 21 39 26 12 285 -48 -41 45 11 -42 25 12 -41 17 33 -42 52 47 58 0 0 -41 51 56 21 39 29 13 286 -49 -41 31 51 -42 12 0 -41 4 7 -42 39 42 57 0 0 -41 38 2 21 39 32 13 287 -49 -41 17 52 -41 58 10 -40 50 2 -42 25 58 56 0 0 -41 23 28 21 39 35 14 287 -50 -41 3 14 -41 43 42 -40 35 17 -42 11 36 55 0 0 -41 8 15 21 39 38 15 288 -50 -40 47 56 -41 28 33 -40 19 52 -41 56 34 54 0 0 -40 52 21 21 39 42 16 289 -51 -40 31 57 -41 12 45 -40 3 47 -41 40 53 53 0 0 -40 35 47 21 39 45 16 289 -52 -40 15 18 -40 56 16 -39 47 0 -41 24 31 52 0 0 -40 18 32 21 39 49 17 290 -52 -39 57 57 -40 39 6 -39 29 32 -41 7 29 51 0 0 -40 0 35 21 39 53 18 290 -53 -39 39 54 -40 21 15 -39 11 21 -40 49 45 50 0 0 -39 41 55 21 39 58 19 291 -53 -39 21 9 -40 2 41 -38 52 28 -40 31 20 49 0 0 -39 22 33 21 40 2 20 292 -54 -39 1 41 -39 43 25 -38 32 51 -40 12 12 48 0 0 -39 2 28 21 40 7 21 292 -55 -38 41 29 -39 23 26 -38 12 31 -39 52 22 47 0 0 -38 41 38 21 40 12 21 293 -55 -38 20 33 -39 2 43 -37 51 27 -39 31 47 46 0 0 -38 20 5 21 40 18 22 293 -56 -37 58 53 -38 41 16 -37 29 37 -39 10 29 45 0 0 -37 57 45 21 40 23 23 294 -56 -37 36 27 -38 19 3 -37 7 2 -38 48 26 44 0 0 -37 34 40 21 40 29 24 295 -57 -37 13 15 -37 56 5 -36 43 41 -38 25 37 43 0 0 -37 10 49 21 40 35 25 295 -57 -36 49 17 -37 32 21 -36 19 33 -38 2 3 42 0 0 -36 46 11 21 40 41 26 296 -58 -36 24 31 -37 7 50 -35 54 37 -37 37 42 41 0 0 -36 20 45 21 40 48 27 296 -59 -35 58 58 -36 42 31 -35 28 54 -37 12 33 40 0 0 -35 54 31 21 40 55 27 297 -59 -35 32 37 -36 16 25 -35 2 22 -36 46 37 39 0 0 -35 27 28 21 41 2 28 297 -60 -35 5 26 -35 49 30 -34 35 1 -36 19 53 38 0 0 -34 59 36 21 41 9 29 298 -60 -34 37 26 -35 21 45 -34 6 50 -35 52 19 37 0 0 -34 30 53 21 41 17 30 299 -61 -34 8 36 -34 53 11 -33 37 49 -35 23 55 36 0 0 -34 1 20 21 41 25 31 299 -61 -33 38 54 -34 23 45 -33 7 56 -34 54 41 35 0 0 -33 30 56 21 41 34 32 300 -62 -33 8 22 -33 53 29 -32 37 13 -34 24 36 34 0 0 -32 59 40 21 41 42 33 300 -62 -32 36 58 -33 22 22 -32 5 37 -33 53 40 33 0 0 -32 27 32 21 41 51 34 301 -63 -32 4 41 -32 50 22 -31 33 9 -33 21 52 32 0 0 -31 54 30 21 42 1 35 301 -63 -31 31 31 -32 17 29 -30 59 47 -32 49 11 31 0 0 -31 20 36 21 42 11 36 301 -64 -30 57 28 -31 43 43 -30 25 32 -32 15 37 30 0 0 -30 45 48 21 42 21 37 302 -64 -30 22 31 -31 9 3 -29 50 23 -31 41 9 29 0 0 -30 10 5 21 42 31 38 302 -64 -29 46 40 -30 33 30 -29 14 20 -31 5 47 28 0 0 -29 33 28 21 42 42 39 303 -65 -29 9 54 -29 57 2 -28 37 22 -30 29 31 27 0 0 -28 55 56 21 42 53 40 303 -65 -28 32 13 -29 19 38 -27 59 29 -29 52 21 26 0 0 -28 17 29 21 43 5 41 304 -65 -27 53 37 -28 41 20 -27 20 40 -29 14 15 25 0 0 -27 38 6 21 43 17 42 304 -66 -27 14 6 -28 2 7 -26 40 57 -28 35 13 24 0 0 -26 57 48 21 43 29 43 304 -66 -26 33 39 -27 21 57 -26 0 17 -27 55 16 23 0 0 -26 16 34 21 43 42 44 305 -66 -25 52 16 -26 40 52 -25 18 42 -27 14 24 22 0 0 -25 34 25 21 43 55 45 305 -66 -25 9 57 -25 58 52 -24 36 11 -26 32 36 21 0 0 -24 51 19 21 44 8 47 305 -66 -24 26 43 -25 15 55 -23 52 44 -25 49 51 20 0 0 -24 7 18 21 44 22 48 306 -66 -23 42 33 -24 32 3 -23 8 22 -25 6 12 19 0 0 -23 22 22 21 44 37 49 306 -66 -22 57 27 -23 47 16 -22 23 4 -24 21 36 18 0 0 -22 36 30 21 44 51 50 306 -66 -22 11 27 -23 1 33 -21 36 51 -23 36 6 17 0 0 -21 49 44 21 45 7 51 306 -66 -21 24 32 -22 14 55 -20 49 44 -22 49 40 16 0 0 -21 2 3 21 45 22 52 306 -66 -20 36 42 -21 27 23 -20 1 42 -22 2 20 15 0 0 -20 13 28 21 45 38 53 307 -66 -19 47 59 -20 38 57 -19 12 47 -21 14 6 14 0 0 -19 24 1 21 45 55 55 307 -66 -18 58 23 -19 49 38 -18 22 59 -20 24 58 13 0 0 -18 33 40 21 46 12 56 307 -65 -18 7 54 -18 59 26 -17 32 19 -19 34 58 12 0 0 -17 42 29 21 46 29 57 307 -65 -17 16 35 -18 8 23 -16 40 48 -18 44 6 11 0 0 -16 50 27 21 46 46 58 307 -65 -16 24 24 -17 16 29 -15 48 27 -17 52 23 10 0 0 -15 57 35 21 47 5 60 307 -64 -15 31 25 -16 23 45 -14 55 17 -16 59 50 9 0 0 -15 3 56 21 47 23 61 307 -64 -14 37 38 -15 30 13 -14 1 19 -16 6 29 8 0 0 -14 9 30 21 47 42 62 307 -63 -13 43 4 -14 35 54 -13 6 35 -15 12 20 7 0 0 -13 14 18 21 48 1 63 307 -62 -12 47 45 -13 40 50 -12 11 5 -14 17 26 6 0 0 -12 18 22 21 48 21 65 306 -62 -11 51 43 -12 45 1 -11 14 53 -13 21 47 5 0 0 -11 21 45 21 48 41 66 306 -61 -10 54 58 -11 48 31 -10 17 59 -12 25 26 4 0 0 -10 24 27 21 49 1 67 306 -60 - 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41 0 0 32 45 13 22 4 33 54 139 -13 33 10 53 32 19 34 33 46 23 31 44 13 - 42 0 0 33 29 6 22 4 48 53 139 -12 33 54 38 33 3 36 34 29 55 32 28 27 - 43 0 0 34 12 2 22 5 2 52 138 -11 34 37 25 33 46 41 35 12 30 33 11 44 - 44 0 0 34 54 1 22 5 16 51 137 -10 35 19 15 34 28 49 35 54 8 33 54 5 - 45 0 0 35 35 5 22 5 29 50 137 -9 36 0 9 35 10 1 36 34 49 34 35 30 - 46 0 0 36 15 11 22 5 42 49 136 -9 36 40 7 35 50 17 37 14 34 35 15 58 - 47 0 0 36 54 21 22 5 54 48 135 -8 37 19 8 36 29 37 37 53 22 35 55 30 - 48 0 0 37 32 36 22 6 7 47 135 -7 37 57 13 37 8 0 38 31 14 36 34 6 - 49 0 0 38 9 55 22 6 19 46 134 -6 38 34 22 37 45 28 39 8 11 37 11 47 - 50 0 0 38 46 18 22 6 30 45 133 -5 39 10 37 38 22 1 39 44 12 37 48 33 - 51 0 0 39 21 47 22 6 41 44 133 -4 39 45 56 38 57 39 40 19 19 38 24 23 - 52 0 0 39 56 21 22 6 52 43 132 -3 40 20 21 39 32 23 40 53 31 38 59 20 - 53 0 0 40 30 2 22 7 3 42 131 -3 40 53 53 40 6 13 41 26 50 39 33 22 - 54 0 0 41 2 50 22 7 13 41 131 -2 41 26 31 40 39 10 41 59 16 40 6 32 - 55 0 0 41 34 45 22 7 23 40 130 -1 41 58 17 41 11 14 42 30 49 40 38 48 - 56 0 0 42 5 48 22 7 32 39 129 0 42 29 12 41 42 26 43 1 31 41 10 13 Uncertainty in time = +/- 8 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 0238-02251-1 * constellation : Hydra * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 09 36 19.0804 DE: +03 18 39.984 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .022, .022 ) * V mag [mag]: 11.0 * B mag [mag]: 11.4 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (322) Phaeo approx. diameter [km]: 71 approx. diameter ["]: .038 distance from Earth [AU]: 2.58000 * orbital information: orbit source: Preston date of fit: 2008 Mar 19 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 735 number of rejected observations: 73 time covered by the observations: 1900 Sep 25 - 2008 Feb 10 1 sigma uncertainty ellipse (major, minor, PA): 0.018, 0.013, 112° remarks: * orbital elements for (322) Phaeo : Mean anomaly = 134.24753484 deg Arg. of pericenter = 115.33958715 deg Long. of node = 252.42352912 deg Inclination = 8.04775717 deg Eccentricity = 0.24468776 Semimajor axis = 2.78420326 AU Perihelion dist = 2.10294281 AU Mag: H = 8.99, G = 0.15 Epoch of elements : MJD 54923.91300000 TDT (2009 Apr 02.913) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Apr 2 322 Phaeo 21h 55.1m UT 11.0 9 36 19.080 3 18 39.98TYC 0238-02251-1 11.4 14.4 71 10.7 2.580 -0.557 9.54 -16.0781 3.309 -147.93 5.25 21.9189 0.06040 0.05327 -2.45422 2.80033 0.00436 -0.00077 2000 133.4173742009 330.00000115.339587252.423529 8.0477570.24468776 2.7842033 2.1029428 9.0 5.00.15 RATE 2.1215470 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.028 0.025 99 1.69 0.026 0 54545.5020090402_2251-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 06:42 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org