IOTA/IOTA-ES occultation update for (338) Budrosa / TYC 1877-01618-1 event on 2008 May 07, 09:22 UT Visible from N Africa Summary ------- On 2008 May 07 UT, the 74 km diameter asteroid (338) Budrosa will occult a 10.6 mag star in the constellation Gemini for observers along a path across N Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.7 mag to 14.3 mag (the magnitude of the asteroid) for at most 2.0 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: 83 * date and approx. time of event: 2008 May 07, 09:24 - 2008 May 07, 09:25 UT * midpoint of event [JD]: 2454593.89075417 * magnitude of target star: 10.6 * magnitude drop [mag]: 3.7 * estimated maximum duration [s]: 2.0 * Moon: 5 % sunlit, 19° distance * Sun: 45° distance * rough path description: N Africa The occultation path -------------------- * approximate projected width [km]: 80 * 1 sigma uncertainty interval [path widths]: +/- 0.63 * 1 sigma uncertainty interval [seconds]: +/- 1.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .022 +/- .018) * 1 sigma uncertainty ellipse (major, minor, PA): ( .022", .018", 92° ) * approx speed of asteroid's shadow [km/s]: 37.7394 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1877-01618-1 by 338 Budrosa 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 126 0 0 - 8 9 26 9 24 34 39 310 0 - 8 32 34 - 7 46 21 - 9 1 50 - 7 17 23 127 0 0 - 8 30 59 9 24 36 38 309 -2 - 8 54 10 - 8 7 52 - 9 23 29 - 7 38 50 128 0 0 - 8 52 53 9 24 39 37 309 -3 - 9 16 6 - 8 29 43 - 9 45 28 - 8 0 38 129 0 0 - 9 15 5 9 24 41 36 308 -4 - 9 38 21 - 8 51 53 -10 7 47 - 8 22 45 130 0 0 - 9 37 37 9 24 43 35 308 -5 -10 0 55 - 9 14 22 -10 30 24 - 8 45 11 131 0 0 -10 0 26 9 24 44 34 308 -6 -10 23 47 - 9 37 9 -10 53 19 - 9 7 55 132 0 0 -10 23 34 9 24 46 33 307 -7 -10 46 57 -10 0 14 -11 16 32 - 9 30 57 133 0 0 -10 46 58 9 24 48 32 307 -8 -11 10 24 -10 23 36 -11 40 2 - 9 54 16 134 0 0 -11 10 39 9 24 50 31 307 -9 -11 34 8 -10 47 15 -12 3 49 -10 17 51 135 0 0 -11 34 37 9 24 52 30 306 -10 -11 58 8 -11 11 10 -12 27 52 -10 41 43 136 0 0 -11 58 50 9 24 53 29 306 -11 -12 22 23 -11 35 21 -12 52 10 -11 5 51 137 0 0 -12 23 17 9 24 55 28 305 -12 -12 46 53 -11 59 46 -13 16 43 -11 30 14 138 0 0 -12 48 0 9 24 57 27 305 -13 -13 11 38 -12 24 26 -13 41 31 -11 54 51 139 0 0 -13 12 55 9 24 58 26 305 -14 -13 36 36 -12 49 19 -14 6 32 -12 19 41 140 0 0 -13 38 4 9 25 0 25 304 -15 -14 1 47 -13 14 26 -14 31 46 -12 44 45 141 0 0 -14 3 25 9 25 1 24 304 -16 -14 27 10 -13 39 45 -14 57 12 -13 10 2 142 0 0 -14 28 58 9 25 2 23 304 -17 -14 52 45 -14 5 16 -15 22 49 -13 35 30 143 0 0 -14 54 43 9 25 4 22 303 -18 -15 18 31 -14 30 58 -15 48 38 -14 1 10 144 0 0 -15 20 37 9 25 5 21 303 -19 -15 44 28 -14 56 51 -16 14 37 -14 27 0 145 0 0 -15 46 41 9 25 6 20 303 -20 -16 10 34 -15 22 53 -16 40 45 -14 53 0 146 0 0 -16 12 54 9 25 7 19 303 -22 -16 36 49 -15 49 4 -17 7 3 -15 19 9 147 0 0 -16 39 16 9 25 8 18 302 -23 -17 3 12 -16 15 24 -17 33 28 -15 45 27 148 0 0 -17 5 45 9 25 9 17 302 -24 -17 29 43 -16 41 52 -18 0 1 -16 11 52 149 0 0 -17 32 21 9 25 10 16 302 -25 -17 56 20 -17 8 26 -18 26 41 -16 38 24 150 0 0 -17 59 3 9 25 11 15 301 -26 -18 23 4 -17 35 7 -18 53 26 -17 5 3 151 0 0 -18 25 50 9 25 12 14 301 -27 -18 49 53 -18 1 53 -19 20 17 -17 31 47 152 0 0 -18 52 43 9 25 13 13 300 -28 -19 16 46 -18 28 44 -19 47 12 -17 58 37 153 0 0 -19 19 39 9 25 13 11 300 -29 -19 43 44 -18 55 38 -20 14 11 -18 25 30 154 0 0 -19 46 38 9 25 14 10 300 -30 -20 10 44 -19 22 36 -20 41 13 -18 52 27 155 0 0 -20 13 40 9 25 15 9 299 -31 -20 37 47 -19 49 37 -21 8 17 -19 19 26 156 0 0 -20 40 43 9 25 15 8 299 -32 -21 4 51 -20 16 40 -21 35 23 -19 46 27 157 0 0 -21 7 47 9 25 16 7 299 -33 -21 31 56 -20 43 43 -22 2 29 -20 13 30 158 0 0 -21 34 52 9 25 16 6 298 -34 -21 59 2 -21 10 47 -22 29 35 -20 40 33 159 0 0 -22 1 56 9 25 16 5 298 -35 -22 26 6 -21 37 50 -22 56 41 -21 7 35 160 0 0 -22 28 59 9 25 17 4 298 -36 -22 53 10 -22 4 53 -23 23 45 -21 34 37 161 0 0 -22 56 0 9 25 17 3 297 -37 -23 20 11 -22 31 53 -23 50 47 -22 1 36 162 0 0 -23 22 58 9 25 17 2 297 -37 -23 47 10 -22 58 51 -24 17 46 -22 28 34 163 0 0 -23 49 53 9 25 17 1 296 -38 -24 14 5 -23 25 45 -24 44 41 -22 55 28 164 0 0 -24 16 43 9 25 17 0 296 -39 .. .. .. -23 52 36 .. .. .. -23 22 18 Uncertainty in time = +/- 1 secs [Prediction of 2008 Feb 17.0] Data for the target star ------------------------ * name: TYC 1877-01618-1 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 08 49.3140 DE: +23 32 01.423 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .019, .017 ) * V mag [mag]: 10.6 * B mag [mag]: 10.6 * Apparent position with proper motion RA(deg): 92.3310359432 DE(deg): 23.5339275497 * Equation of equinoxes (radians) : 0.000038827880828 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (338) Budrosa approx. diameter [km]: 74 approx. diameter ["]: .029 distance from Earth [AU]: 3.50300 * orbital information: orbit source: Preston date of fit: 2008 Feb 16 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 776 number of rejected observations: 108 time covered by the observations: 1900 Apr 03 - 2008 Feb 02 1 sigma uncertainty ellipse (major, minor, PA): 0.012, 0.008, 97° remarks: * orbital elements for (338) Budrosa : Mean anomaly = 54.07026715 deg Arg. of pericenter = 122.72936908 deg Long. of node = 287.62409198 deg Inclination = 6.03835430 deg Eccentricity = 0.02052652 Semimajor axis = 2.91309405 AU Perihelion dist = 2.85329838 AU Mag: H = 8.41, G = 0.15 Epoch of elements : MJD 54593.39100000 TDT (2008 May 07.391) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 7 338 Budrosa 9h 22.7m UT 10.6 6 8 49.314 23 32 1.42TYC 1877-01618-1 10.6 14.3 74 2.0 3.503 3.880 -3.50 85.9403 23.534 38.47 16.97 9.3781 -0.02627 -0.38647 21.25563 -1.39200 0.00401 -0.00006 2000 53.3980652008 5 4.00000122.729369287.624092 6.0383540.02052652 2.9130941 2.8532984 8.5 5.00.15 RATE 1.9823130 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.022 0.018 92 1.63 0.018 0 54513.5020080507_1618-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 31, 04:05 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org