IOTA/IOTA-ES occultation update for (67) Asia / TYC 6255-02137-1 event on 2008 Oct 13, 18:33 UT Visible from Africa Summary ------- On 2008 Oct 13 UT, the 58 km diameter asteroid (67) Asia will occult a 10.2 mag star in the constellation Sagittarius for observers along a path across Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.5 mag to 12.6 mag (the magnitude of the asteroid) for at most 1.9 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: 88 * date and approx. time of event: 2008 Oct 13, 18:34 - 2008 Oct 13, 18:36 UT * midpoint of event [JD]: 2454753.27315417 * magnitude of target star: 10.2 * magnitude drop [mag]: 2.5 * estimated maximum duration [s]: 1.9 * Moon: 99 % sunlit, 97° distance * Sun: 70° distance * rough path description: Africa The occultation path -------------------- * approximate projected width [km]: 62 * 1 sigma uncertainty interval [path widths]: +/- 0.56 * 1 sigma uncertainty interval [seconds]: +/- 1.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .022 +/- .021) * 1 sigma uncertainty ellipse (major, minor, PA): ( .022", .021", 89° ) * approx speed of asteroid's shadow [km/s]: 30.8718 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6255-02137-1 by 67 Asia on 2008 Oct 13 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 - 12 0 0 3 22 5 18 34 23 62 221 -1 3 5 12 3 39 1 2 46 20 3 58 0 - 11 0 0 3 24 59 18 34 26 61 222 -2 3 8 5 3 41 54 2 49 13 4 0 54 - 10 0 0 3 28 14 18 34 30 60 223 -3 3 11 20 3 45 10 2 52 27 4 4 10 - 9 0 0 3 31 50 18 34 33 60 225 -4 3 14 56 3 48 46 2 56 2 4 7 47 - 8 0 0 3 35 48 18 34 37 59 226 -5 3 18 53 3 52 44 2 59 59 4 11 45 - 7 0 0 3 40 7 18 34 40 58 227 -6 3 23 12 3 57 3 3 4 17 4 16 5 - 6 0 0 3 44 47 18 34 43 57 228 -7 3 27 51 4 1 44 3 8 56 4 20 46 - 5 0 0 3 49 48 18 34 47 57 229 -8 3 32 52 4 6 46 3 13 57 4 25 48 - 4 0 0 3 55 10 18 34 50 56 230 -9 3 38 14 4 12 9 3 19 18 4 31 11 - 3 0 0 4 0 54 18 34 53 55 231 -10 3 43 57 4 17 52 3 25 0 4 36 56 - 2 0 0 4 6 58 18 34 56 54 232 -11 3 50 0 4 23 57 3 31 3 4 43 1 - 1 0 0 4 13 23 18 34 59 53 233 -12 3 56 25 4 30 23 3 37 27 4 49 27 0 0 0 4 20 8 18 35 3 52 233 -13 4 3 10 4 37 9 3 44 11 4 56 14 1 0 0 4 27 14 18 35 6 51 234 -14 4 10 15 4 44 16 3 51 16 5 3 22 2 0 0 4 34 41 18 35 9 51 235 -15 4 17 41 4 51 43 3 58 41 5 10 50 3 0 0 4 42 28 18 35 12 50 235 -16 4 25 27 4 59 30 4 6 26 5 18 38 4 0 0 4 50 35 18 35 15 49 236 -17 4 33 33 5 7 38 4 14 32 5 26 47 5 0 0 4 59 2 18 35 18 48 237 -18 4 42 0 5 16 6 4 22 57 5 35 16 6 0 0 5 7 49 18 35 20 47 237 -19 4 50 46 5 24 54 4 31 43 5 44 4 7 0 0 5 16 56 18 35 23 46 238 -20 4 59 52 5 34 1 4 40 48 5 53 13 8 0 0 5 26 22 18 35 26 45 238 -21 5 9 18 5 43 29 4 50 12 6 2 41 9 0 0 5 36 8 18 35 29 44 239 -22 5 19 3 5 53 15 4 59 56 6 12 28 10 0 0 5 46 13 18 35 32 43 239 -23 5 29 7 6 3 21 5 10 0 6 22 35 11 0 0 5 56 37 18 35 34 42 240 -24 5 39 30 6 13 46 5 20 22 6 33 1 12 0 0 6 7 20 18 35 37 41 240 -25 5 50 12 6 24 30 5 31 3 6 43 46 13 0 0 6 18 22 18 35 40 40 240 -26 6 1 13 6 35 33 5 42 3 6 54 50 14 0 0 6 29 42 18 35 42 39 241 -27 6 12 32 6 46 54 5 53 21 7 6 12 15 0 0 6 41 21 18 35 45 38 241 -28 6 24 10 6 58 34 6 4 58 7 17 53 16 0 0 6 53 17 18 35 47 37 241 -29 6 36 5 7 10 31 6 16 52 7 29 52 17 0 0 7 5 32 18 35 49 36 242 -30 6 48 19 7 22 47 6 29 5 7 42 8 18 0 0 7 18 4 18 35 52 35 242 -31 7 0 50 7 35 20 6 41 34 7 54 42 19 0 0 7 30 53 18 35 54 34 242 -32 7 13 38 7 48 10 6 54 22 8 7 34 20 0 0 7 44 0 18 35 56 33 243 -33 7 26 44 8 1 18 7 7 26 8 20 43 21 0 0 7 57 23 18 35 58 32 243 -34 7 40 6 8 14 42 7 20 47 8 34 8 22 0 0 8 11 3 18 36 0 31 243 -35 7 53 45 8 28 23 7 34 25 8 47 50 23 0 0 8 25 0 18 36 2 30 244 -36 8 7 41 8 42 21 7 48 20 9 1 49 24 0 0 8 39 12 18 36 4 29 244 -37 8 21 52 8 56 34 8 2 30 9 16 4 25 0 0 8 53 40 18 36 6 28 244 -38 8 36 19 9 11 3 8 16 56 9 30 34 26 0 0 9 8 24 18 36 8 27 244 -39 8 51 2 9 25 48 8 31 37 9 45 20 27 0 0 9 23 23 18 36 10 26 245 -40 9 6 0 9 40 48 8 46 34 10 0 21 28 0 0 9 38 37 18 36 12 25 245 -41 9 21 12 9 56 3 9 1 45 10 15 37 29 0 0 9 54 5 18 36 13 24 245 -42 9 36 40 10 11 32 9 17 12 10 31 8 30 0 0 10 9 47 18 36 15 23 246 -43 9 52 21 10 27 16 9 32 52 10 46 52 31 0 0 10 25 44 18 36 16 22 246 -44 10 8 16 10 43 13 9 48 46 11 2 51 32 0 0 10 41 54 18 36 18 21 246 -45 10 24 25 10 59 24 10 4 54 11 19 3 33 0 0 10 58 17 18 36 19 20 246 -46 10 40 47 11 15 48 10 21 15 11 35 28 34 0 0 11 14 53 18 36 21 19 246 -47 10 57 22 11 32 25 10 37 48 11 52 6 35 0 0 11 31 41 18 36 22 18 247 -48 11 14 10 11 49 14 10 54 35 12 8 57 36 0 0 11 48 41 18 36 23 17 247 -49 11 31 9 12 6 16 11 11 33 12 25 59 37 0 0 12 5 54 18 36 24 16 247 -50 11 48 20 12 23 29 11 28 43 12 43 14 38 0 0 12 23 17 18 36 25 15 247 -51 12 5 43 12 40 54 11 46 5 13 0 39 39 0 0 12 40 52 18 36 26 14 248 -52 12 23 17 12 58 29 12 3 37 13 18 16 40 0 0 12 58 37 18 36 27 13 248 -53 12 41 1 13 16 15 12 21 20 13 36 3 41 0 0 13 16 32 18 36 28 12 248 -54 12 58 55 13 34 11 12 39 14 13 54 0 42 0 0 13 34 37 18 36 29 11 248 -55 13 16 59 13 52 17 12 57 17 14 12 7 43 0 0 13 52 51 18 36 30 10 249 -56 13 35 13 14 10 32 13 15 29 14 30 23 44 0 0 14 11 14 18 36 30 9 249 -57 13 53 35 14 28 56 13 33 51 14 48 48 45 0 0 14 29 46 18 36 31 8 249 -58 14 12 6 14 47 29 13 52 21 15 7 21 46 0 0 14 48 26 18 36 32 7 249 -59 14 30 45 15 6 9 14 10 59 15 26 3 47 0 0 15 7 13 18 36 32 6 250 -59 14 49 31 15 24 57 14 29 44 15 44 52 48 0 0 15 26 8 18 36 32 5 250 -60 15 8 25 15 43 52 14 48 37 16 3 48 49 0 0 15 45 9 18 36 33 4 250 -61 15 27 25 16 2 54 15 7 37 16 22 51 50 0 0 16 4 16 18 36 33 3 251 -62 15 46 32 16 22 3 15 26 43 16 42 0 51 0 0 16 23 30 18 36 33 2 251 -63 16 5 45 16 41 17 15 45 55 17 1 14 52 0 0 16 42 48 18 36 33 1 251 -64 16 25 3 17 0 36 16 5 12 17 20 34 53 0 0 17 2 12 18 36 33 0 251 -65 16 44 26 .. .. .. 16 24 35 .. .. .. Uncertainty in time = +/- 1 secs [Prediction of 2008 Sep 5.0] Data for the target star ------------------------ * name: TYC 6255-02137-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 01 20.1839 DE: -17 45 42.882 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .020 ) * V mag [mag]: 10.2 * B mag [mag]: 10.7 * Apparent position with proper motion RA(deg): 270.4632516815 DE(deg): -17.7630061037 * Equation of equinoxes (radians) : 0.000047763671109 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (67) Asia approx. diameter [km]: 58 approx. diameter ["]: .038 distance from Earth [AU]: 2.08700 * orbital information: orbit source: Preston date of fit: 2008 Sep 04 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1029 number of rejected observations: 134 time covered by the observations: 1907 Nov 02 - 2008 Jul 24 1 sigma uncertainty ellipse (major, minor, PA): 0.011, 0.007, 87° remarks: * orbital elements for (67) Asia : Mean anomaly = 353.08255442 deg Arg. of pericenter = 106.20669502 deg Long. of node = 202.69583860 deg Inclination = 6.02632406 deg Eccentricity = 0.18532841 Semimajor axis = 2.42185081 AU Perihelion dist = 1.97301306 AU Mag: H = 8.29, G = 0.15 Epoch of elements : MJD 54752.77300000 TDT (2008 Oct 13.773) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Oct 13 67 Asia 18h 33.3m UT 10.2 18 1 20.184-17 45 42.88TYC 6255-02137-1 10.7 12.6 58 1.9 2.087 5.129 -4.41 -30.6915 -17.760 -101.81 -8.12 18.5557 0.02064 0.36203 17.39328 -1.04916 0.00491 0.00019 2000 352.35739620081011.00000106.206695202.695839 6.0263240.18532841 2.4218508 1.9730131 8.3 5.00.15 RATE 2.6150680 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.022 0.021 89 1.56 0.021 0 54714.5020081013_2137-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Sep 11, 17:12 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org