IOTA/IOTA-ES occultation update for (1909) Alekhin / HIP 59150 event on 2009 Jan 05, 09:31 UT Visible from Summary ------- On 2009 Jan 05 UT, the 17 km diameter asteroid (1909) Alekhin will occult a 8.6 mag star in the constellation Virgo for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 7.8 mag to 16.4 mag (the magnitude of the asteroid) for at most 1.2 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: . The event at a glimpse ---------------------- * Rank: 30 * date and approx. time of event: 2009 Jan 05, 09:23 - 2009 Jan 05, 09:32 UT * magnitude of target star: 8.6 * magnitude drop [mag]: 7.8 * estimated maximum duration [s]: 1.2 * Moon: 59 % sunlit, 157° distance * Sun: 102° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 17 * 1 sigma uncertainty interval [path widths]: +/- 2.20 * 1 sigma uncertainty interval [seconds]: +/- 5.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .060 +/- .035) * 1 sigma uncertainty ellipse (major, minor, PA): ( .063", .028", 111° ) * approx speed of asteroid's shadow [km/s]: 14.1361 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 59150 by 1909 Alekhin on 2009 Jan 5 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 -152 0 0 30 35 6 9 23 43 0 94 -76 30 30 29 30 39 44 30 10 8 31 0 6 -151 0 0 30 31 31 9 23 43 1 94 -77 30 26 53 30 36 9 30 6 32 30 56 31 -150 0 0 30 27 32 9 23 43 2 95 -78 30 22 54 30 32 10 30 2 32 30 52 33 -149 0 0 30 23 9 9 23 43 3 95 -78 30 18 31 30 27 47 29 58 8 30 48 11 -148 0 0 30 18 22 9 23 43 4 96 -79 30 13 44 30 23 0 29 53 20 30 43 25 -147 0 0 30 13 11 9 23 44 4 96 -80 30 8 32 30 17 49 29 48 7 30 38 15 -146 0 0 30 7 35 9 23 44 5 97 -80 30 2 57 30 12 14 29 42 31 30 32 41 -145 0 0 30 1 36 9 23 45 6 97 -81 29 56 57 30 6 15 29 36 30 30 26 43 -144 0 0 29 55 12 9 23 46 7 98 -81 29 50 33 29 59 51 29 30 5 30 20 20 -143 0 0 29 48 24 9 23 47 8 98 -82 29 43 45 29 53 4 29 23 15 30 13 34 -142 0 0 29 41 12 9 23 48 9 99 -82 29 36 32 29 45 52 29 16 1 30 6 23 -141 0 0 29 33 35 9 23 49 10 99 -83 29 28 55 29 38 15 29 8 23 29 58 48 -140 0 0 29 25 34 9 23 50 11 100 -83 29 20 53 29 30 14 29 0 20 29 50 48 -139 0 0 29 17 8 9 23 52 11 100 -83 29 12 27 29 21 48 28 51 52 29 42 24 -138 0 0 29 8 17 9 23 53 12 101 -83 29 3 36 29 12 58 28 43 0 29 33 35 -137 0 0 28 59 2 9 23 55 13 101 -83 28 54 21 29 3 44 28 33 43 29 24 22 -136 0 0 28 49 23 9 23 56 14 102 -83 28 44 41 28 54 4 28 24 1 29 14 45 -135 0 0 28 39 18 9 23 58 15 102 -82 28 34 36 28 44 0 28 13 55 29 4 42 -134 0 0 28 28 49 9 24 0 16 103 -82 28 24 6 28 33 31 28 3 23 28 54 15 -133 0 0 28 17 55 9 24 2 17 103 -82 28 13 12 28 22 38 27 52 27 28 43 23 -132 0 0 28 6 36 9 24 4 18 104 -81 28 1 52 28 11 19 27 41 6 28 32 7 -131 0 0 27 54 52 9 24 6 19 104 -80 27 50 8 27 59 36 27 29 19 28 20 25 -130 0 0 27 42 43 9 24 9 20 105 -80 27 37 59 27 47 28 27 17 8 28 8 19 -129 0 0 27 30 9 9 24 11 20 105 -79 27 25 25 27 34 54 27 4 32 27 55 48 -128 0 0 27 17 11 9 24 14 21 106 -78 27 12 25 27 21 56 26 51 30 27 42 52 -127 0 0 27 3 47 9 24 17 22 106 -78 26 59 1 27 8 33 26 38 4 27 29 30 -126 0 0 26 49 58 9 24 19 23 106 -77 26 45 12 26 54 44 26 24 12 27 15 44 -125 0 0 26 35 44 9 24 22 24 107 -76 26 30 57 26 40 31 26 9 55 27 1 33 -124 0 0 26 21 5 9 24 25 25 107 -75 26 16 17 26 25 52 25 55 14 26 46 57 -123 0 0 26 6 1 9 24 29 26 108 -74 26 1 13 26 10 49 25 40 7 26 31 56 -122 0 0 25 50 31 9 24 32 27 108 -73 25 45 43 25 55 20 25 24 34 26 16 29 -121 0 0 25 34 37 9 24 35 28 109 -73 25 29 48 25 39 26 25 8 37 26 0 38 -120 0 0 25 18 18 9 24 39 29 109 -72 25 13 29 25 23 8 24 52 15 25 44 22 -119 0 0 25 1 34 9 24 43 30 110 -71 24 56 44 25 6 24 24 35 28 25 27 41 -118 0 0 24 44 25 9 24 47 31 110 -70 24 39 34 24 49 15 24 18 15 25 10 35 -117 0 0 24 26 51 9 24 51 32 111 -69 24 21 59 24 31 42 24 0 38 24 53 4 -116 0 0 24 8 52 9 24 55 33 111 -68 24 4 0 24 13 44 23 42 36 24 35 8 -115 0 0 23 50 28 9 24 59 34 112 -67 23 45 36 23 55 21 23 24 9 24 16 48 -114 0 0 23 31 40 9 25 3 35 112 -66 23 26 47 23 36 33 23 5 18 23 58 3 -113 0 0 23 12 27 9 25 8 36 112 -65 23 7 33 23 17 21 22 46 2 23 38 53 -112 0 0 22 52 50 9 25 13 37 113 -64 22 47 56 22 57 44 22 26 21 23 19 19 -111 0 0 22 32 48 9 25 17 38 113 -63 22 27 54 22 37 43 22 6 17 22 59 21 -110 0 0 22 12 23 9 25 22 39 114 -62 22 7 27 22 17 18 21 45 48 22 38 59 -109 0 0 21 51 33 9 25 27 40 114 -61 21 46 37 21 56 29 21 24 55 22 18 13 -108 0 0 21 30 20 9 25 32 41 115 -60 21 25 23 21 35 17 21 3 38 21 57 3 -107 0 0 21 8 43 9 25 38 42 115 -59 21 3 46 21 13 41 20 41 58 21 35 29 -106 0 0 20 46 43 9 25 43 43 115 -58 20 41 45 20 51 41 20 19 55 21 13 32 -105 0 0 20 24 20 9 25 49 44 116 -57 20 19 21 20 29 18 19 57 28 20 51 12 -104 0 0 20 1 34 9 25 54 45 116 -56 19 56 35 20 6 33 19 34 39 20 28 29 -103 0 0 19 38 25 9 26 0 46 117 -55 19 33 25 19 43 25 19 11 27 20 5 24 -102 0 0 19 14 54 9 26 6 47 117 -54 19 9 54 19 19 55 18 47 53 19 41 56 -101 0 0 18 51 1 9 26 12 48 118 -53 18 46 1 18 56 2 18 23 57 19 18 7 -100 0 0 18 26 47 9 26 19 49 118 -52 18 21 46 18 31 49 17 59 40 18 53 55 - 99 0 0 18 2 12 9 26 25 50 119 -51 17 57 10 18 7 14 17 35 1 18 29 23 - 98 0 0 17 37 15 9 26 31 51 119 -50 17 32 13 17 42 18 17 10 2 18 4 30 - 97 0 0 17 11 58 9 26 38 52 119 -49 17 6 55 17 17 2 16 44 42 17 39 16 - 96 0 0 16 46 22 9 26 45 53 120 -48 16 41 18 16 51 25 16 19 2 17 13 42 - 95 0 0 16 20 26 9 26 52 54 120 -47 16 15 21 16 25 30 15 53 4 16 47 49 - 94 0 0 15 54 11 9 26 59 55 121 -46 15 49 6 15 59 15 15 26 46 16 21 36 - 93 0 0 15 27 37 9 27 6 56 121 -45 15 22 32 15 32 42 15 0 9 15 55 6 - 92 0 0 15 0 45 9 27 13 58 122 -44 14 55 40 15 5 51 14 33 15 15 28 17 - 91 0 0 14 33 37 9 27 20 59 122 -43 14 28 31 14 38 43 14 6 4 15 1 10 - 90 0 0 14 6 11 9 27 28 60 123 -42 14 1 4 14 11 18 13 38 36 14 33 47 - 89 0 0 13 38 29 9 27 35 61 123 -40 13 33 22 13 43 36 13 10 52 14 6 8 - 88 0 0 13 10 32 9 27 43 62 124 -39 13 5 25 13 15 39 12 42 52 13 38 13 - 87 0 0 12 42 20 9 27 51 63 124 -38 12 37 12 12 47 28 12 14 38 13 10 3 - 86 0 0 12 13 54 9 27 59 64 125 -37 12 8 45 12 19 2 11 46 10 12 41 39 - 85 0 0 11 45 14 9 28 6 65 126 -36 11 40 5 11 50 22 11 17 28 12 13 1 - 84 0 0 11 16 21 9 28 15 66 126 -35 11 11 12 11 21 30 10 48 34 11 44 10 - 83 0 0 10 47 17 9 28 23 67 127 -34 10 42 8 10 52 26 10 19 27 11 15 7 - 82 0 0 10 18 1 9 28 31 69 128 -33 10 12 52 10 23 11 9 50 10 10 45 53 - 81 0 0 9 48 35 9 28 39 70 129 -32 9 43 25 9 53 45 9 20 43 10 16 29 - 80 0 0 9 18 59 9 28 48 71 130 -30 9 13 49 9 24 9 8 51 6 9 46 54 - 79 0 0 8 49 15 9 28 56 72 131 -29 8 44 5 8 54 25 8 21 20 9 17 11 - 78 0 0 8 19 22 9 29 5 73 132 -28 8 14 12 8 24 33 7 51 26 8 47 19 - 77 0 0 7 49 23 9 29 13 74 133 -27 7 44 12 7 54 33 7 21 26 8 17 21 - 76 0 0 7 19 17 9 29 22 75 134 -26 7 14 6 7 24 28 6 51 20 7 47 16 - 75 0 0 6 49 6 9 29 31 76 136 -25 6 43 55 6 54 17 6 21 8 7 17 5 - 74 0 0 6 18 50 9 29 40 77 138 -24 6 13 40 6 24 1 5 50 52 6 46 50 - 73 0 0 5 48 31 9 29 49 78 140 -22 5 43 20 5 53 42 5 20 33 6 16 31 - 72 0 0 5 18 10 9 29 57 79 142 -21 5 12 59 5 23 21 4 50 11 5 46 10 - 71 0 0 4 47 46 9 30 6 80 146 -20 4 42 35 4 52 57 4 19 47 5 15 47 - 70 0 0 4 17 22 9 30 15 81 149 -19 4 12 11 4 22 33 3 49 23 4 45 22 - 69 0 0 3 46 58 9 30 24 82 154 -18 3 41 47 3 52 9 3 18 59 4 14 58 - 68 0 0 3 16 35 9 30 33 83 160 -17 3 11 24 3 21 46 2 48 37 3 44 35 - 67 0 0 2 46 14 9 30 42 84 168 -16 2 41 3 2 51 25 2 18 16 3 14 13 - 66 0 0 2 15 56 9 30 51 85 177 -14 2 10 45 2 21 7 1 47 59 2 43 54 - 65 0 0 1 45 42 9 31 1 85 189 -13 1 40 31 1 50 52 1 17 46 2 13 39 - 64 0 0 1 15 32 9 31 10 85 202 -12 1 10 22 1 20 43 0 47 37 1 43 29 - 63 0 0 0 45 28 9 31 19 85 216 -11 0 40 18 0 50 38 0 17 34 1 13 24 - 62 0 0 0 15 31 9 31 28 85 229 -10 0 10 21 0 20 41 - 0 12 22 0 43 25 - 61 0 0 - 0 14 19 9 31 37 84 239 -9 - 0 19 29 - 0 9 9 - 0 42 10 0 13 34 - 60 0 0 - 0 44 1 9 31 46 84 248 -7 - 0 49 10 - 0 38 51 - 1 11 50 - 0 16 10 - 59 0 0 - 1 13 33 9 31 55 83 254 -6 - 1 18 42 - 1 8 24 - 1 41 21 - 0 45 44 - 58 0 0 - 1 42 56 9 32 4 82 259 -5 - 1 48 4 - 1 37 47 - 2 10 42 - 1 15 8 - 57 0 0 - 2 12 7 9 32 13 81 264 -4 - 2 17 16 - 2 6 59 - 2 39 52 - 1 44 22 - 56 0 0 - 2 41 7 9 32 22 80 267 -3 - 2 46 15 - 2 35 59 - 3 8 50 - 2 13 24 - 55 0 0 - 3 9 55 9 32 30 79 269 -2 - 3 15 3 - 3 4 47 - 3 37 35 - 2 42 14 - 54 0 0 - 3 38 29 9 32 39 78 272 -1 - 3 43 37 - 3 33 22 - 4 6 7 - 3 10 50 Uncertainty in time = +/- 6 secs [Prediction of 2008 Nov 16.0] Data for the target star ------------------------ * name: HIP 59150 * constellation : Virgo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 12 07 49.1197 DE: -03 07 50.091 * position source: mpos:HIP2 pm:HIP2 plx:HIP2 * standard error: RA,DE ["]: ( .012, .009 ) * V mag [mag]: 8.6 * B mag [mag]: 9.1 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1909) Alekhin approx. diameter [km]: 17 approx. diameter ["]: .013 distance from Earth [AU]: 1.76100 * orbital information: orbit source: Preston date of fit: 2008 Nov 03 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1058 number of rejected observations: 29 time covered by the observations: 1926 Apr 14 - 2008 Apr 13 1 sigma uncertainty ellipse (major, minor, PA): 0.062, 0.027, 112° remarks: * orbital elements for (1909) Alekhin : Mean anomaly = 307.50637049 deg Arg. of pericenter = 5.38729217 deg Long. of node = 227.69161633 deg Inclination = 1.78597121 deg Eccentricity = 0.22278024 Semimajor axis = 2.42482543 AU Perihelion dist = 1.88462223 AU Mag: H = 12.60, G = 0.15 Epoch of elements : MJD 54836.39700000 TDT (2009 Jan 05.397) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jan 5 1909 Alekhin 9h 31.2m UT 8.6 12 7 49.120- 3 7 50.09HIP 59150 9.1 16.4 17 1.2 1.761 2.397 -17.27 -65.9605 -3.126 38.57 -22.57 9.5201 0.03741 0.07462 7.19061 -3.45786 -0.00506 0.00224 2000 305.83658820081230.00000 5.387292227.691616 1.7859710.22278024 2.4248254 1.884622212.3 5.00.15 RATE 2.6102580 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.063 0.028 111 3.20 0.029 0 54786.5020090105__59150 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 16, 16:45 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org