IOTA/IOTA-ES occultation update for (65) Cybele / TYC 6258-00410-1 event on 2008 Apr 01, 06:13 UT Visible from SE USA Summary ------- On 2008 Apr 01 UT, the 237 km diameter asteroid (65) Cybele will occult a 11.7 mag star in the constellation Sagittarius for observers along a path across SE USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.1 mag to 12.3 mag (the magnitude of the asteroid) for at most 22.2 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: 2008 Apr 01, 06:07 - 2008 Apr 01, 06:15 UT * midpoint of event [JD]: 2454557.75937083 * magnitude of target star: 11.7 * magnitude drop [mag]: 1.1 * estimated maximum duration [s]: 22.2 * Moon: 27 % sunlit, 41° distance * Sun: 103° distance * rough path description: SE USA The occultation path -------------------- * approximate projected width [km]: 366 * 1 sigma uncertainty interval [path widths]: +/- 0.32 * 1 sigma uncertainty interval [seconds]: +/- 6.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .039 +/- .039) * 1 sigma uncertainty ellipse (major, minor, PA): ( .039", .039", 90° ) * approx speed of asteroid's shadow [km/s]: 10.6795 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6258-00410-1 by 65 Cybele on 2008 Apr 1 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 - 86 0 0 39 1 33 6 7 4 1 116 -46 37 14 56 .. .. .. .. .. .. .. .. .. - 85 0 0 38 39 44 6 7 4 2 116 -46 36 53 25 40 30 29 .. .. .. 41 44 2 - 84 0 0 38 18 11 6 7 5 2 117 -47 36 32 10 40 8 36 .. .. .. 41 21 54 - 83 0 0 37 56 55 6 7 5 3 118 -47 36 11 11 39 47 0 35 5 32 41 0 4 - 82 0 0 37 35 56 6 7 6 4 118 -47 35 50 30 39 25 41 34 45 2 40 38 31 - 81 0 0 37 15 16 6 7 7 5 119 -47 35 30 7 39 4 41 34 24 49 40 17 16 - 80 0 0 36 54 54 6 7 9 6 120 -47 35 10 3 38 43 59 34 4 54 39 56 21 - 79 0 0 36 34 51 6 7 10 7 120 -47 34 50 17 38 23 37 33 45 19 39 35 45 - 78 0 0 36 15 9 6 7 12 8 121 -47 34 30 51 38 3 35 33 26 3 39 15 29 - 77 0 0 35 55 46 6 7 14 8 121 -47 34 11 46 37 43 54 33 7 7 38 55 35 - 76 0 0 35 36 45 6 7 16 9 122 -47 33 53 1 37 24 35 32 48 32 38 36 2 - 75 0 0 35 18 6 6 7 19 10 123 -47 33 34 38 37 5 37 32 30 19 38 16 51 - 74 0 0 34 59 49 6 7 21 11 123 -47 33 16 37 36 47 2 32 12 27 37 58 3 - 73 0 0 34 41 54 6 7 24 12 124 -47 32 58 58 36 28 49 31 54 57 37 39 38 - 72 0 0 34 24 23 6 7 27 13 124 -47 32 41 42 36 11 1 31 37 50 37 21 37 - 71 0 0 34 7 15 6 7 30 14 125 -47 32 24 50 35 53 36 31 21 7 37 4 0 - 70 0 0 33 50 32 6 7 34 14 126 -47 32 8 21 35 36 36 31 4 47 36 46 48 - 69 0 0 33 34 13 6 7 37 15 126 -47 31 52 17 35 20 1 30 48 51 36 30 1 - 68 0 0 33 18 20 6 7 41 16 127 -46 31 36 38 35 3 52 30 33 20 36 13 41 - 67 0 0 33 2 52 6 7 45 17 128 -46 31 21 24 34 48 8 30 18 14 35 57 46 - 66 0 0 32 47 50 6 7 50 18 128 -46 31 6 35 34 32 51 30 3 34 35 42 19 - 65 0 0 32 33 14 6 7 54 19 129 -45 30 52 13 34 18 1 29 49 19 35 27 18 - 64 0 0 32 19 6 6 7 59 19 130 -45 30 38 17 34 3 38 29 35 31 35 12 46 - 63 0 0 32 5 25 6 8 4 20 130 -45 30 24 48 33 49 43 29 22 9 34 58 41 - 62 0 0 31 52 11 6 8 9 21 131 -44 30 11 47 33 36 16 29 9 15 34 45 4 - 61 0 0 31 39 25 6 8 14 22 132 -44 29 59 12 33 23 18 28 56 47 34 31 57 - 60 0 0 31 27 8 6 8 20 23 132 -43 29 47 6 33 10 48 28 44 47 34 19 18 - 59 0 0 31 15 19 6 8 25 23 133 -43 29 35 28 32 58 48 28 33 16 34 7 9 - 58 0 0 31 3 59 6 8 31 24 134 -42 29 24 19 32 47 16 28 22 12 33 55 30 - 57 0 0 30 53 9 6 8 37 25 135 -42 29 13 38 32 36 15 28 11 37 33 44 21 - 56 0 0 30 42 48 6 8 43 26 135 -41 29 3 26 32 25 44 28 1 31 33 33 43 - 55 0 0 30 32 57 6 8 50 26 136 -41 28 53 44 32 15 43 27 51 54 33 23 35 - 54 0 0 30 23 36 6 8 56 27 137 -40 28 44 32 32 6 13 27 42 47 33 13 58 - 53 0 0 30 14 46 6 9 3 28 138 -39 28 35 49 31 57 14 27 34 9 33 4 53 - 52 0 0 30 6 26 6 9 10 29 139 -39 28 27 37 31 48 46 27 26 1 32 56 19 - 51 0 0 29 58 37 6 9 17 29 139 -38 28 19 55 31 40 49 27 18 23 32 48 17 - 50 0 0 29 51 19 6 9 24 30 140 -37 28 12 43 31 33 24 27 11 15 32 40 47 - 49 0 0 29 44 32 6 9 31 31 141 -37 28 6 2 31 26 31 27 4 38 32 33 49 - 48 0 0 29 38 17 6 9 39 31 142 -36 27 59 53 31 20 9 26 58 31 32 27 24 - 47 0 0 29 32 34 6 9 46 32 143 -35 27 54 14 31 14 20 26 52 56 32 21 31 - 46 0 0 29 27 22 6 9 54 32 144 -35 27 49 7 31 9 4 26 47 51 32 16 11 - 45 0 0 29 22 42 6 10 2 33 145 -34 27 44 31 31 4 20 26 43 17 32 11 23 - 44 0 0 29 18 34 6 10 10 34 146 -33 27 40 26 31 0 8 26 39 15 32 7 9 - 43 0 0 29 14 59 6 10 18 34 147 -32 27 36 54 30 56 29 26 35 44 32 3 28 - 42 0 0 29 11 56 6 10 26 35 148 -32 27 33 53 30 53 24 26 32 44 32 0 21 - 41 0 0 29 9 25 6 10 35 35 149 -31 27 31 24 30 50 51 26 30 17 31 57 47 - 40 0 0 29 7 27 6 10 43 36 150 -30 27 29 27 30 48 51 26 28 20 31 55 46 - 39 0 0 29 6 1 6 10 52 36 151 -29 27 28 2 30 47 25 26 26 56 31 54 19 - 38 0 0 29 5 8 6 11 1 37 152 -28 27 27 9 30 46 31 26 26 3 31 53 25 - 37 0 0 29 4 48 6 11 9 37 153 -28 27 26 49 30 46 12 26 25 43 31 53 6 - 36 0 0 29 5 0 6 11 18 37 154 -27 27 27 1 30 46 25 26 25 54 31 53 20 - 35 0 0 29 5 46 6 11 27 38 155 -26 27 27 45 30 47 12 26 26 37 31 54 8 - 34 0 0 29 7 4 6 11 36 38 156 -25 27 29 1 30 48 32 26 27 52 31 55 29 - 33 0 0 29 8 55 6 11 45 38 158 -24 27 30 49 30 50 26 26 29 39 31 57 25 - 32 0 0 29 11 19 6 11 54 39 159 -23 27 33 10 30 52 53 26 31 58 31 59 54 - 31 0 0 29 14 15 6 12 4 39 160 -22 27 36 3 30 55 53 26 34 49 32 2 57 - 30 0 0 29 17 44 6 12 13 39 161 -22 27 39 29 30 59 27 26 38 12 32 6 34 - 29 0 0 29 21 46 6 12 22 39 162 -21 27 43 26 31 3 34 26 42 7 32 10 45 - 28 0 0 29 26 21 6 12 31 40 164 -20 27 47 56 31 8 14 26 46 34 32 15 29 - 27 0 0 29 31 28 6 12 41 40 165 -19 27 52 57 31 13 28 26 51 32 32 20 46 - 26 0 0 29 37 8 6 12 50 40 166 -18 27 58 31 31 19 14 26 57 2 32 26 38 - 25 0 0 29 43 20 6 13 0 40 168 -17 28 4 37 31 25 33 27 3 4 32 33 2 - 24 0 0 29 50 5 6 13 9 40 169 -16 28 11 14 31 32 26 27 9 37 32 40 0 - 23 0 0 29 57 21 6 13 19 40 170 -15 28 18 23 31 39 51 27 16 41 32 47 31 - 22 0 0 30 5 10 6 13 28 40 171 -14 28 26 3 31 47 48 27 24 17 32 55 35 - 21 0 0 30 13 30 6 13 38 40 173 -13 28 34 15 31 56 18 27 32 24 33 4 11 - 20 0 0 30 22 22 6 13 47 40 174 -13 28 42 58 32 5 20 27 41 1 33 13 21 - 19 0 0 30 31 46 6 13 57 40 175 -12 28 52 12 32 14 54 27 50 9 33 23 2 - 18 0 0 30 41 40 6 14 6 40 177 -11 29 1 56 32 25 0 27 59 48 33 33 16 - 17 0 0 30 52 6 6 14 15 40 178 -10 29 12 12 32 35 38 28 9 57 33 44 2 - 16 0 0 31 3 3 6 14 25 40 179 -9 29 22 57 32 46 47 28 20 36 33 55 19 - 15 0 0 31 14 30 6 14 34 40 180 -8 29 34 13 32 58 27 28 31 45 34 7 8 - 14 0 0 31 26 27 6 14 44 39 182 -7 29 45 59 33 10 37 28 43 24 34 19 28 - 13 0 0 31 38 55 6 14 53 39 183 -6 29 58 14 33 23 18 28 55 32 34 32 19 - 12 0 0 31 51 52 6 15 2 39 184 -5 30 10 58 33 36 30 29 8 8 34 45 40 - 11 0 0 32 5 18 6 15 11 38 185 -4 30 24 11 33 50 11 29 21 14 34 59 32 - 10 0 0 32 19 14 6 15 20 38 187 -3 30 37 53 34 4 22 29 34 48 35 13 53 - 9 0 0 32 33 38 6 15 29 38 188 -3 30 52 4 34 19 1 29 48 50 35 28 44 - 8 0 0 32 48 31 6 15 38 37 189 -2 31 6 42 34 34 10 30 3 20 35 44 4 - 7 0 0 33 3 51 6 15 47 37 190 -1 31 21 47 34 49 47 30 18 17 35 59 52 Uncertainty in time = +/- 7 secs [Prediction of 2008 Mar 7.0] Data for the target star ------------------------ * name: TYC 6258-00410-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 52 43.6722 DE: -19 22 32.086 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .037, .038 ) * V mag [mag]: 11.7 * B mag [mag]: 12.3 * Apparent position with proper motion RA(deg): 268.3078218896 DE(deg): -19.3796677570 * Equation of equinoxes (radians) : 0.000041578032699 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (65) Cybele approx. diameter [km]: 237 approx. diameter ["]: .122 distance from Earth [AU]: 2.68900 * orbital information: orbit source: Preston date of fit: 2008 Feb 27 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1442 number of rejected observations: 126 time covered by the observations: 1903 Dec 14 - 2007 Jul 25 1 sigma uncertainty ellipse (major, minor, PA): 0.014, 0.008, 92° remarks: * orbital elements for (65) Cybele : Mean anomaly = 350.71469283 deg Arg. of pericenter = 105.59262927 deg Long. of node = 155.78078328 deg Inclination = 3.54802239 deg Eccentricity = 0.10592168 Semimajor axis = 3.43652895 AU Perihelion dist = 3.07252602 AU Mag: H = 6.70, G = 0.01 Epoch of elements : MJD 54557.25900000 TDT (2008 Apr 01.259) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Apr 1 65 Cybele 6h 13.5m UT 11.7 17 52 43.672-19 22 32.09TYC 6258-00410-1 12.3 12.3 237 22.2 2.689 1.380 2.68 -15.1732 -19.376 87.59 4.71 6.2249 -0.10245 0.75571 5.97210 0.81754 -0.00569 -0.00002 2000 349.5916382008 325.00000105.592629155.780783 3.5480220.10592168 3.4365290 3.0725260 6.6 5.00.01 RATE 1.5471210 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.039 0.039 90 1.32 0.039 0 54532.5020080401_0410-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 07, 13:15 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org