IOTA/IOTA-ES occultation update for (383) Janina / TYC 6353-01043-1 event on 2008 Oct 14, 10:15 UT Visible from E Russia Summary ------- On 2008 Oct 14 UT, the 46 km diameter asteroid (383) Janina will occult a 9.9 mag star in the constellation Capricornus for observers along a path across E Russia. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.3 mag to 15.2 mag (the magnitude of the asteroid) for at most 8.5 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: 58 * date and approx. time of event: 2008 Oct 14, 10:15 - 2008 Oct 14, 10:26 UT * midpoint of event [JD]: 2454753.9286 * magnitude of target star: 9.9 * magnitude drop [mag]: 5.3 * estimated maximum duration [s]: 8.5 * Moon: 100 % sunlit, 63° distance * Sun: 111° distance * rough path description: E Russia The occultation path -------------------- * approximate projected width [km]: 99 * 1 sigma uncertainty interval [path widths]: +/- 1.07 * 1 sigma uncertainty interval [seconds]: +/- 10.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .031 +/- .026) * 1 sigma uncertainty ellipse (major, minor, PA): ( .031", .026", 83° ) * approx speed of asteroid's shadow [km/s]: 5.3440 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6353-01043-1 by 383 Janina on 2008 Oct 14 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 147 59 39 70 0 0 10 26 18 0 191 -20 149 17 32 146 40 54 ... .. .. 143 49 4 147 23 20 69 0 0 10 26 18 1 191 -21 148 37 57 146 7 53 ... .. .. 143 23 19 146 44 38 68 0 0 10 26 17 2 190 -21 147 56 21 145 32 9 ... .. .. 142 54 4 146 3 49 67 0 0 10 26 15 3 190 -21 147 12 54 144 53 58 ... .. .. 142 21 42 145 21 1 66 0 0 10 26 12 4 189 -21 146 27 46 144 13 34 ... .. .. 141 46 30 144 36 26 65 0 0 10 26 8 5 188 -22 145 41 2 143 31 6 147 57 10 141 8 43 143 50 8 64 0 0 10 26 3 6 187 -22 144 52 50 142 46 45 147 4 55 140 28 34 143 2 14 63 0 0 10 25 57 7 187 -22 144 3 12 142 0 35 146 11 38 139 46 11 142 12 47 62 0 0 10 25 51 8 186 -22 143 12 12 141 12 42 145 17 20 139 1 41 141 21 50 61 0 0 10 25 43 9 185 -22 142 19 51 140 23 9 144 22 0 138 15 11 140 29 24 60 0 0 10 25 35 10 184 -22 141 26 10 139 31 59 143 25 39 137 26 44 139 35 31 59 0 0 10 25 25 11 183 -22 140 31 10 138 39 13 142 28 15 136 36 23 138 40 10 58 0 0 10 25 15 13 182 -22 139 34 49 137 44 52 141 29 45 135 44 9 137 43 19 57 0 0 10 25 3 14 181 -22 138 37 6 136 48 54 140 30 9 134 50 2 136 44 58 56 0 0 10 24 51 15 180 -22 137 37 59 135 51 18 139 29 22 133 54 1 135 45 3 55 0 0 10 24 37 16 179 -21 136 37 24 134 52 1 138 27 22 132 56 4 134 43 30 54 0 0 10 24 23 17 178 -21 135 35 19 133 51 0 137 24 5 131 56 8 133 40 15 53 0 0 10 24 7 17 177 -21 134 31 38 132 48 10 136 19 25 130 54 8 132 35 12 52 0 0 10 23 50 18 176 -20 133 26 16 131 43 26 135 13 16 129 49 57 131 28 15 51 0 0 10 23 31 19 175 -20 132 19 6 130 36 40 134 5 34 128 43 30 130 19 15 50 0 0 10 23 12 20 174 -19 131 10 0 129 27 44 132 56 9 127 34 35 129 8 3 49 0 0 10 22 51 21 172 -18 129 58 49 128 16 28 131 44 54 126 23 3 127 54 28 48 0 0 10 22 29 22 171 -18 128 45 22 127 2 41 130 31 38 125 8 39 126 38 15 47 0 0 10 22 6 23 169 -17 127 29 27 125 46 7 129 16 11 123 51 7 125 19 8 46 0 0 10 21 41 24 168 -16 126 10 47 124 26 29 127 58 18 122 30 6 123 56 49 45 0 0 10 21 14 24 166 -15 124 49 6 123 3 26 126 37 43 121 5 11 122 30 52 44 0 0 10 20 46 25 165 -14 123 24 1 121 36 33 125 14 8 119 35 51 121 0 50 43 0 0 10 20 16 26 163 -13 121 55 4 120 5 17 123 47 10 118 1 27 119 26 5 42 0 0 10 19 44 26 161 -11 120 21 43 118 28 58 122 16 21 116 21 5 117 45 50 41 0 0 10 19 10 27 159 -10 118 43 15 116 46 43 120 41 7 114 33 37 115 59 3 40 0 0 10 18 34 27 157 -8 116 58 45 114 57 21 119 0 44 112 37 28 114 4 21 39 0 0 10 17 55 27 154 -7 115 7 1 112 59 17 117 14 14 110 30 19 111 59 45 38 0 0 10 17 13 27 152 -5 113 6 21 110 50 9 115 20 25 108 8 38 Latitude Latitude Latitude Latitude 110 0 0 37 7 21 10 16 32 27 150 -3 36 37 2 37 38 16 35 33 58 38 46 33 109 0 0 36 42 49 10 16 13 27 149 -2 36 12 48 37 13 24 35 10 20 38 20 55 108 0 0 36 19 29 10 15 53 27 147 -1 35 49 46 36 49 46 34 47 52 37 56 35 107 0 0 35 57 22 10 15 33 27 146 0 35 27 55 36 27 21 34 26 34 37 33 30 Uncertainty in time = +/- 11 secs [Prediction of 2008 Sep 11.0] Data for the target star ------------------------ * name: TYC 6353-01043-1 * constellation : Capricornus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 21 02 57.9852 DE: -19 38 33.567 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .020 ) * V mag [mag]: 9.9 * B mag [mag]: 10.3 * Apparent position with proper motion RA(deg): 315.8719187263 DE(deg): -19.6077819993 * Equation of equinoxes (radians) : 0.000047395367628 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (383) Janina approx. diameter [km]: 46 approx. diameter ["]: .025 distance from Earth [AU]: 2.49700 * orbital information: orbit source: Preston date of fit: 2008 Sep 04 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 952 number of rejected observations: 92 time covered by the observations: 1906 Mar 20 - 2008 Aug 21 1 sigma uncertainty ellipse (major, minor, PA): 0.022, 0.017, 76° remarks: * orbital elements for (383) Janina : Mean anomaly = 294.67990253 deg Arg. of pericenter = 321.05316586 deg Long. of node = 93.08811784 deg Inclination = 2.65331922 deg Eccentricity = 0.16333975 Semimajor axis = 3.14304129 AU Perihelion dist = 2.62965771 AU Mag: H = 9.74, G = 0.15 Epoch of elements : MJD 54753.42800000 TDT (2008 Oct 14.428) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Oct 14 383 Janina 10h 17.2m UT 9.9 21 2 57.985-19 38 33.57TYC 6353-01043-1 10.3 15.2 46 8.5 2.497 0.692 4.19 138.1100 -19.643 22.19 -8.36 10.2864 -0.34998 0.81381 2.77239 1.18826 0.00516 0.00163 2000 294.07355820081011.00000321.053166 93.088118 2.6533190.16333975 3.1430413 2.6296577 9.9 5.00.15 RATE 1.7688010 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.031 0.026 83 2.07 0.027 0 54720.5020081014_1043-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Sep 11, 19:15 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org