IOTA/IOTA-ES occultation update for (6463) Isoda / TYC 7316-00990-1 event on 2008 May 07, 19:58 UT Visible from Indonesia, Arabia, Africa Summary ------- On 2008 May 07 UT, the 14 km diameter asteroid (6463) Isoda will occult a 10.4 mag star in the constellation Lupus for observers along a path across Indonesia, Arabia, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.7 mag to 16.1 mag (the magnitude of the asteroid) for at most 1.1 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: 16 * date and approx. time of event: 2008 May 07, 19:51 - 2008 May 07, 20:04 UT * midpoint of event [JD]: 2454594.3318875 * magnitude of target star: 10.4 * magnitude drop [mag]: 5.7 * estimated maximum duration [s]: 1.1 * Moon: 8 % sunlit, 152° distance * Sun: 163° distance * rough path description: Indonesia, Arabia, Africa The occultation path -------------------- * approximate projected width [km]: 17 * 1 sigma uncertainty interval [path widths]: +/- 4.21 * 1 sigma uncertainty interval [seconds]: +/- 8.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .089 +/- .044) * 1 sigma uncertainty ellipse (major, minor, PA): ( .090", .041", 100° ) * approx speed of asteroid's shadow [km/s]: 12.9768 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7316-00990-1 by 6463 Isoda on 2008 May 7 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 11 0 0 43 9 32 20 4 30 1 140 -16 43 16 53 43 2 11 44 19 38 .. .. .. 12 0 0 42 17 29 20 4 30 2 141 -17 42 24 49 42 10 10 43 27 20 .. .. .. 13 0 0 41 25 5 20 4 30 3 142 -18 41 32 24 41 17 48 42 34 38 .. .. .. 14 0 0 40 32 23 20 4 29 4 142 -19 40 39 39 40 25 7 41 41 37 39 24 41 15 0 0 39 39 25 20 4 28 6 143 -21 39 46 39 39 32 12 40 48 19 38 32 3 16 0 0 38 46 15 20 4 26 7 144 -22 38 53 28 38 39 4 39 54 48 37 39 14 17 0 0 37 52 57 20 4 25 8 144 -23 38 0 7 37 45 48 39 1 6 36 46 17 18 0 0 36 59 33 20 4 23 9 145 -24 37 6 40 36 52 26 38 7 18 35 53 15 19 0 0 36 6 6 20 4 21 10 145 -25 36 13 11 35 59 2 37 13 26 35 0 12 20 0 0 35 12 40 20 4 19 12 146 -27 35 19 42 35 5 39 36 19 34 34 7 11 21 0 0 34 19 18 20 4 16 13 147 -28 34 26 17 34 12 19 35 25 45 33 14 14 22 0 0 33 26 2 20 4 13 14 147 -29 33 32 58 33 19 6 34 32 1 32 21 24 23 0 0 32 32 56 20 4 10 15 148 -30 32 39 49 32 26 3 33 38 26 31 28 45 24 0 0 31 40 2 20 4 6 16 148 -31 31 46 52 31 33 12 32 45 3 30 36 18 25 0 0 30 47 23 20 4 3 17 149 -33 30 54 10 30 40 36 31 51 55 29 44 7 26 0 0 29 55 2 20 3 59 19 150 -34 30 1 46 29 48 18 30 59 4 28 52 14 27 0 0 29 3 1 20 3 54 20 150 -35 29 9 42 28 56 21 30 6 33 28 0 42 28 0 0 28 11 22 20 3 50 21 151 -36 28 18 0 28 4 45 29 14 24 27 9 32 29 0 0 27 20 9 20 3 45 22 151 -37 27 26 44 27 13 35 28 22 40 26 18 47 30 0 0 26 29 22 20 3 40 23 152 -39 26 35 54 26 22 52 27 31 23 25 28 30 31 0 0 25 39 5 20 3 35 24 153 -40 25 45 34 25 32 37 26 40 35 24 38 41 32 0 0 24 49 19 20 3 30 26 153 -41 24 55 44 24 42 54 25 50 18 23 49 24 33 0 0 24 0 5 20 3 24 27 154 -42 24 6 27 23 53 44 25 0 35 23 0 39 34 0 0 23 11 26 20 3 18 28 154 -43 23 17 45 23 5 8 24 11 25 22 12 28 35 0 0 22 23 23 20 3 12 29 155 -44 22 29 39 22 17 8 23 22 52 21 24 54 36 0 0 21 35 58 20 3 6 30 156 -46 21 42 10 21 29 45 22 34 57 20 37 56 37 0 0 20 49 11 20 2 59 31 156 -47 20 55 21 20 43 2 21 47 42 19 51 38 38 0 0 20 3 5 20 2 53 32 157 -48 20 9 12 19 56 59 21 1 6 19 5 59 39 0 0 19 17 40 20 2 46 33 158 -49 19 23 44 19 11 37 20 15 13 18 21 1 40 0 0 18 32 57 20 2 39 34 158 -50 18 38 58 18 26 57 19 30 2 17 36 46 41 0 0 17 48 58 20 2 32 35 159 -51 17 54 56 17 43 1 18 45 35 16 53 13 42 0 0 17 5 43 20 2 25 36 160 -52 17 11 38 16 59 48 18 1 53 16 10 24 43 0 0 16 23 13 20 2 17 37 161 -53 16 29 6 16 17 21 17 18 56 15 28 20 44 0 0 15 41 29 20 2 10 38 161 -54 15 47 19 15 35 40 16 36 46 14 47 1 45 0 0 15 0 31 20 2 2 39 162 -55 15 6 18 14 54 45 15 55 22 14 6 28 46 0 0 14 20 21 20 1 54 40 163 -56 14 26 5 14 14 37 15 14 46 13 26 41 47 0 0 13 40 57 20 1 46 41 164 -57 13 46 39 13 35 16 14 34 58 12 47 41 48 0 0 13 2 22 20 1 38 42 165 -58 13 8 1 12 56 43 13 55 59 12 9 29 49 0 0 12 24 35 20 1 30 43 166 -59 12 30 11 12 18 58 13 17 48 11 32 4 50 0 0 11 47 36 20 1 22 43 167 -60 11 53 10 11 42 2 12 40 26 10 55 28 51 0 0 11 11 26 20 1 14 44 168 -61 11 16 58 11 5 54 12 3 54 10 19 40 52 0 0 10 36 5 20 1 5 45 169 -62 10 41 35 10 30 36 11 28 11 9 44 40 53 0 0 10 1 34 20 0 57 46 170 -62 10 7 1 9 56 6 10 53 18 9 10 29 54 0 0 9 27 51 20 0 49 46 171 -63 9 33 17 9 22 26 10 19 15 8 37 7 55 0 0 8 54 59 20 0 40 47 172 -64 9 0 22 8 49 36 9 46 1 8 4 34 56 0 0 8 22 55 20 0 32 48 173 -64 8 28 16 8 17 34 9 13 38 7 32 49 57 0 0 7 51 41 20 0 23 48 174 -65 7 57 1 7 46 23 8 42 5 7 1 54 58 0 0 7 21 17 20 0 14 49 175 -66 7 26 34 7 16 0 8 11 22 6 31 48 59 0 0 6 51 42 20 0 6 50 176 -66 6 56 58 6 46 27 7 41 30 6 2 30 60 0 0 6 22 57 19 59 57 50 177 -67 6 28 11 6 17 44 7 12 27 5 34 2 61 0 0 5 55 1 19 59 48 51 179 -67 6 0 13 5 49 49 6 44 14 5 6 22 62 0 0 5 27 54 19 59 39 51 180 -67 5 33 4 5 22 44 6 16 50 4 39 31 63 0 0 5 1 37 19 59 31 52 181 -68 5 6 45 4 56 29 5 50 17 4 13 29 64 0 0 4 36 8 19 59 22 52 183 -68 4 41 15 4 31 2 5 24 33 3 48 15 65 0 0 4 11 29 19 59 13 52 184 -68 4 16 34 4 6 24 4 59 39 3 23 50 66 0 0 3 47 38 19 59 4 53 185 -68 3 52 41 3 42 34 4 35 33 3 0 13 67 0 0 3 24 36 19 58 56 53 187 -68 3 29 38 3 19 34 4 12 17 2 37 24 68 0 0 3 2 22 19 58 47 53 188 -68 3 7 23 2 57 21 3 49 50 2 15 23 69 0 0 2 40 56 19 58 38 53 189 -68 2 45 56 2 35 57 3 28 12 1 54 10 70 0 0 2 20 19 19 58 30 53 191 -68 2 25 17 2 15 21 3 7 23 1 33 45 71 0 0 2 0 30 19 58 21 54 192 -68 2 5 27 1 55 33 2 47 22 1 14 7 72 0 0 1 41 28 19 58 12 54 194 -68 1 46 24 1 36 33 2 28 9 0 55 16 73 0 0 1 23 14 19 58 3 54 195 -67 1 28 9 1 18 20 2 9 44 0 37 13 74 0 0 1 5 48 19 57 55 54 196 -67 1 10 41 1 0 54 1 52 7 0 19 56 75 0 0 0 49 9 19 57 46 54 198 -67 0 54 1 0 44 16 1 35 18 0 3 27 76 0 0 0 33 16 19 57 38 54 199 -66 0 38 8 0 28 25 1 19 17 - 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Uncertainty in time = +/- 10 secs [Prediction of 2008 Mar 29.0] Data for the target star ------------------------ * name: TYC 7316-00990-1 * constellation : Lupus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 15 11 26.4104 DE: -33 26 15.003 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .020 ) * V mag [mag]: 10.4 * B mag [mag]: 10.8 * Apparent position with proper motion RA(deg): 227.9981488467 DE(deg): -33.4721349409 * Equation of equinoxes (radians) : 0.000039172467793 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (6463) Isoda approx. diameter [km]: 14 approx. diameter ["]: .010 distance from Earth [AU]: 1.91500 * orbital information: orbit source: Preston date of fit: 2008 Mar 28 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 532 number of rejected observations: 11 time covered by the observations: 1954 Aug 27 - 2007 Jun 14 1 sigma uncertainty ellipse (major, minor, PA): 0.088, 0.036, 101° remarks: * orbital elements for (6463) Isoda : Mean anomaly = 242.49865979 deg Arg. of pericenter = 78.32621157 deg Long. of node = 287.43016209 deg Inclination = 11.94679009 deg Eccentricity = 0.18519725 Semimajor axis = 2.61193511 AU Perihelion dist = 2.12821191 AU Mag: H = 11.58, G = 0.15 Epoch of elements : MJD 54593.83200000 TDT (2008 May 07.832) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 7 6463 Isoda 19h 57.9m UT 10.4 15 11 26.410-33 26 15.00TYC 7316-00990-1 10.8 16.1 14 1.1 1.915 -2.530 11.35 62.3510 -33.440 -120.35 17.09 19.9653 0.19908 0.55635 -6.89584 2.46886 -0.00025 0.00160 2000 241.6039422008 5 4.00000 78.326212287.430162 11.9467900.18519725 2.6119351 2.128211911.9 5.00.15 RATE 2.3348590 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.090 0.041 100 5.21 0.042 0 54554.5020080507_0990-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 31, 04:11 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org