IOTA/IOTA-ES occultation update for (6362) Tunis / TYC 7459-00699-1 event on 2008 Oct 14, 20:44 UT Visible from Africa Summary ------- On 2008 Oct 14 UT, the 40 km diameter asteroid (6362) Tunis 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 6.5 mag to 16.7 mag (the magnitude of the asteroid) for at most 3.9 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: 20 * date and approx. time of event: 2008 Oct 14, 20:42 - 2008 Oct 14, 20:54 UT * midpoint of event [JD]: 2454754.36417083 * magnitude of target star: 10.2 * magnitude drop [mag]: 6.5 * estimated maximum duration [s]: 3.9 * Moon: 100 % sunlit, 82° distance * Sun: 99° distance * rough path description: Africa The occultation path -------------------- * approximate projected width [km]: 42 * 1 sigma uncertainty interval [path widths]: +/- 3.34 * 1 sigma uncertainty interval [seconds]: +/- 16.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .106 +/- .062) * 1 sigma uncertainty ellipse (major, minor, PA): ( .107", .061", 98° ) * approx speed of asteroid's shadow [km/s]: 10.1303 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7459-00699-1 by 6362 Tunis 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 ' " Latitude Latitude Latitude Latitude - 41 0 0 -17 24 5 20 42 59 71 143 -1 -17 35 39 -17 12 30 -18 52 38 -15 54 47 - 40 0 0 -17 12 27 20 43 10 71 146 -2 -17 24 3 -17 0 50 -18 41 12 -15 42 56 - 39 0 0 -17 0 6 20 43 21 72 148 -3 -17 11 44 -16 48 28 -18 29 4 -15 30 22 - 38 0 0 -16 47 3 20 43 32 72 151 -4 -16 58 43 -16 35 23 -18 16 15 -15 17 6 - 37 0 0 -16 33 18 20 43 43 72 154 -5 -16 44 59 -16 21 36 -18 2 44 -15 3 6 - 36 0 0 -16 18 50 20 43 55 72 157 -6 -16 30 33 -16 7 6 -17 48 31 -14 48 22 - 35 0 0 -16 3 39 20 44 6 72 160 -7 -16 15 24 -15 51 53 -17 33 36 -14 32 55 - 34 0 0 -15 47 45 20 44 18 73 163 -8 -15 59 32 -15 35 57 -17 17 58 -14 16 45 - 33 0 0 -15 31 8 20 44 29 73 166 -9 -15 42 57 -15 19 17 -17 1 37 -13 59 50 - 32 0 0 -15 13 47 20 44 41 72 169 -10 -15 25 39 -15 1 54 -16 44 34 -13 42 11 - 31 0 0 -14 55 43 20 44 52 72 172 -11 -15 7 37 -14 43 48 -16 26 48 -13 23 48 - 30 0 0 -14 36 55 20 45 4 72 175 -12 -14 48 51 -14 24 57 -16 8 19 -13 4 41 - 29 0 0 -14 17 23 20 45 15 72 178 -13 -14 29 22 -14 5 23 -15 49 7 -12 44 49 - 28 0 0 -13 57 7 20 45 27 72 181 -14 -14 9 9 -13 45 4 -15 29 11 -12 24 13 - 27 0 0 -13 36 7 20 45 39 71 183 -15 -13 48 11 -13 24 1 -15 8 31 -12 2 51 - 26 0 0 -13 14 22 20 45 51 71 186 -16 -13 26 30 -13 2 14 -14 47 8 -11 40 45 - 25 0 0 -12 51 53 20 46 3 70 189 -17 -13 4 4 -12 39 42 -14 25 1 -11 17 54 - 24 0 0 -12 28 40 20 46 14 70 191 -18 -12 40 53 -12 16 26 -14 2 10 -10 54 18 - 23 0 0 -12 4 42 20 46 26 69 193 -20 -12 16 59 -11 52 25 -13 38 35 -10 29 57 - 22 0 0 -11 40 0 20 46 38 68 195 -21 -11 52 19 -11 27 40 -13 14 16 -10 4 50 - 21 0 0 -11 14 33 20 46 50 68 197 -22 -11 26 55 -11 2 9 -12 49 12 - 9 38 59 - 20 0 0 -10 48 21 20 47 2 67 199 -23 -11 0 47 -10 35 55 -12 23 25 - 9 12 22 - 19 0 0 -10 21 25 20 47 14 66 201 -24 -10 33 54 -10 8 55 -11 56 54 - 8 45 1 - 18 0 0 - 9 53 44 20 47 26 65 202 -25 -10 6 16 - 9 41 11 -11 29 38 - 8 16 55 - 17 0 0 - 9 25 19 20 47 38 65 204 -26 - 9 37 55 - 9 12 43 -11 1 38 - 7 48 3 - 16 0 0 - 8 56 10 20 47 49 64 205 -27 - 9 8 49 - 8 43 30 -10 32 55 - 7 18 28 - 15 0 0 - 8 26 16 20 48 1 63 206 -28 - 8 38 59 - 8 13 33 -10 3 28 - 6 48 7 - 14 0 0 - 7 55 39 20 48 13 62 208 -30 - 8 8 25 - 7 42 52 - 9 33 17 - 6 17 3 - 13 0 0 - 7 24 18 20 48 25 61 209 -31 - 7 37 8 - 7 11 28 - 9 2 23 - 5 45 15 - 12 0 0 - 6 52 14 20 48 37 60 210 -32 - 7 5 7 - 6 39 20 - 8 30 46 - 5 12 43 - 11 0 0 - 6 19 27 20 48 48 59 211 -33 - 6 32 24 - 6 6 30 - 7 58 26 - 4 39 29 - 10 0 0 - 5 45 58 20 49 0 58 212 -34 - 5 58 58 - 5 32 57 - 7 25 24 - 4 5 31 - 9 0 0 - 5 11 47 20 49 11 57 212 -35 - 5 24 50 - 4 58 42 - 6 51 40 - 3 30 52 - 8 0 0 - 4 36 54 20 49 23 56 213 -36 - 4 50 1 - 4 23 46 - 6 17 14 - 2 55 31 - 7 0 0 - 4 1 20 20 49 34 55 214 -38 - 4 14 31 - 3 48 8 - 5 42 8 - 2 19 30 - 6 0 0 - 3 25 7 20 49 45 54 215 -39 - 3 38 21 - 3 11 51 - 5 6 21 - 1 42 48 - 5 0 0 - 2 48 13 20 49 57 53 215 -40 - 3 1 31 - 2 34 54 - 4 29 55 - 1 5 27 - 4 0 0 - 2 10 41 20 50 8 52 216 -41 - 2 24 3 - 1 57 19 - 3 52 50 - 0 27 27 - 3 0 0 - 1 32 32 20 50 19 50 216 -42 - 1 45 57 - 1 19 5 - 3 15 8 0 11 10 - 2 0 0 - 0 53 45 20 50 29 49 217 -43 - 1 7 14 - 0 40 15 - 2 36 48 0 50 24 - 1 0 0 - 0 14 23 20 50 40 48 217 -45 - 0 27 55 - 0 0 49 - 1 57 51 1 30 13 0 0 0 0 25 34 20 50 51 47 218 -46 0 11 59 0 39 11 - 1 18 20 2 10 37 1 0 0 1 6 5 20 51 1 46 218 -47 0 52 26 1 19 45 - 0 38 15 2 51 34 2 0 0 1 47 9 20 51 11 45 219 -48 1 33 26 2 0 52 0 2 23 3 33 3 3 0 0 2 28 43 20 51 21 43 219 -49 2 14 58 2 42 30 0 43 33 4 15 3 4 0 0 3 10 47 20 51 31 42 219 -50 2 56 59 3 24 37 1 25 13 4 57 31 5 0 0 3 53 20 20 51 41 41 220 -51 3 39 28 4 7 13 2 7 23 5 40 28 6 0 0 4 36 19 20 51 50 40 220 -53 4 22 25 4 50 15 2 49 59 6 23 50 7 0 0 5 19 44 20 51 59 39 221 -54 5 5 46 5 33 42 3 33 2 7 7 38 8 0 0 6 3 32 20 52 8 37 221 -55 5 49 32 6 17 34 4 16 29 7 51 48 9 0 0 6 47 43 20 52 17 36 221 -56 6 33 40 7 1 47 5 0 19 8 36 19 10 0 0 7 32 13 20 52 25 35 222 -57 7 18 8 7 46 20 5 44 31 9 21 9 11 0 0 8 17 2 20 52 33 34 222 -58 8 2 55 8 31 12 6 29 1 10 6 18 12 0 0 9 2 8 20 52 41 32 222 -59 8 47 58 9 16 20 7 13 50 10 51 41 13 0 0 9 47 29 20 52 49 31 223 -60 9 33 17 10 1 43 7 58 54 11 37 19 14 0 0 10 33 2 20 52 56 30 223 -61 10 18 48 10 47 18 8 44 12 12 23 8 15 0 0 11 18 47 20 53 4 29 223 -62 11 4 31 11 33 5 9 29 42 13 9 7 16 0 0 12 4 41 20 53 10 28 223 -63 11 50 23 12 19 0 10 15 23 13 55 14 17 0 0 12 50 41 20 53 17 26 224 -64 12 36 21 13 5 2 11 1 11 14 41 27 18 0 0 13 36 47 20 53 23 25 224 -65 13 22 26 13 51 9 11 47 6 15 27 44 19 0 0 14 22 55 20 53 29 24 224 -66 14 8 33 14 37 19 12 33 5 16 14 2 20 0 0 15 9 5 20 53 35 23 225 -66 14 54 41 15 23 29 13 19 7 17 0 21 21 0 0 15 55 13 20 53 40 21 225 -67 15 40 49 16 9 39 14 5 8 17 46 36 22 0 0 16 41 19 20 53 45 20 225 -68 16 26 54 16 55 46 14 51 8 18 32 48 23 0 0 17 27 20 20 53 50 19 226 -69 17 12 54 17 41 47 15 37 4 19 18 54 24 0 0 18 13 14 20 53 54 18 226 -69 17 58 48 18 27 41 16 22 55 20 4 51 25 0 0 18 58 59 20 53 59 16 227 -70 18 44 33 19 13 27 17 8 38 20 50 38 26 0 0 19 44 34 20 54 2 15 227 -70 19 30 7 19 59 2 17 54 12 21 36 14 27 0 0 20 29 56 20 54 6 14 227 -71 20 15 30 20 44 24 18 39 35 22 21 35 28 0 0 21 15 4 20 54 9 13 228 -71 21 0 38 21 29 31 19 24 45 23 6 42 29 0 0 21 59 56 20 54 12 12 228 -71 21 45 30 22 14 23 20 9 40 23 51 31 30 0 0 22 44 30 20 54 15 10 228 -71 22 30 5 22 58 57 20 54 18 24 36 1 31 0 0 23 28 45 20 54 17 9 229 -71 23 14 21 23 43 11 21 38 39 25 20 10 32 0 0 24 12 40 20 54 19 8 229 -71 23 58 16 24 27 4 22 22 40 26 3 57 33 0 0 24 56 12 20 54 21 7 230 -71 24 41 49 25 10 35 23 6 20 26 47 21 34 0 0 25 39 20 20 54 22 6 230 -71 25 24 58 25 53 42 23 49 37 27 30 20 35 0 0 26 22 3 20 54 23 5 231 -71 26 7 43 26 36 24 24 32 30 28 12 53 36 0 0 27 4 20 20 54 24 3 231 -70 26 50 1 27 18 39 25 14 58 28 54 59 37 0 0 27 46 9 20 54 25 2 231 -70 27 31 52 28 0 27 .. .. .. 29 36 35 38 0 0 28 27 29 20 54 25 1 232 -70 28 13 14 28 41 46 .. .. .. 30 17 42 39 0 0 29 8 20 20 54 25 0 232 -69 28 54 6 .. .. .. .. .. .. .. .. .. Uncertainty in time = +/- 21 secs [Prediction of 2008 Aug 6.0] Data for the target star ------------------------ * name: TYC 7459-00699-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 20 27 01.9604 DE: -32 15 24.927 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .020 ) * V mag [mag]: 10.2 * B mag [mag]: 11.4 * Apparent position with proper motion RA(deg): 306.9008142650 DE(deg): -32.2294513022 * Equation of equinoxes (radians) : 0.000047191449315 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (6362) Tunis approx. diameter [km]: 40 approx. diameter ["]: .021 distance from Earth [AU]: 2.69000 * orbital information: orbit source: Preston date of fit: 2008 Aug 06 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 466 number of rejected observations: 5 time covered by the observations: 1979 May 19 - 2008 Jun 30 1 sigma uncertainty ellipse (major, minor, PA): 0.105, 0.058, 98° remarks: * orbital elements for (6362) Tunis : Mean anomaly = 298.15455535 deg Arg. of pericenter = 297.71564419 deg Long. of node = 105.37227668 deg Inclination = 19.11695159 deg Eccentricity = 0.17238211 Semimajor axis = 3.19369121 AU Perihelion dist = 2.64315597 AU Mag: H = 11.70, G = 0.15 Epoch of elements : MJD 54753.86400000 TDT (2008 Oct 14.864) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Oct 14 6362 Tunis 20h 44.4m UT 10.2 20 27 1.960-32 15 24.93TYC 7459-00699-1 11.4 16.7 40 3.9 2.690 1.406 5.64 -28.1084 -32.258 -134.64 -8.52 20.7401 -0.09128 0.28493 5.45133 1.72532 0.00550 0.00160 2000 297.48728520081011.00000297.715644105.372277 19.1169520.17238211 3.1936912 2.643156011.2 5.00.15 RATE 1.7268900 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.107 0.061 98 4.34 0.068 0 54684.5020081014_0699-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Sep 11, 20:10 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org