IOTA/IOTA-ES occultation update for (1191) Alfaterna / TYC 0116-00502-1 event on 2008 Dec 05, 07:12 UT Visible from Argentina, Chile Summary ------- On 2008 Dec 05 UT, the 42 km diameter asteroid (1191) Alfaterna will occult a 10.4 mag star in the constellation Orion for observers along a path across Argentina, Chile. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.6 mag to 15.0 mag (the magnitude of the asteroid) for at most 3.3 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 Dec 05, 07:06 - 2008 Dec 05, 07:19 UT * magnitude of target star: 10.4 * magnitude drop [mag]: 4.6 * estimated maximum duration [s]: 3.3 * Moon: 44 % sunlit, 109° distance * Sun: 155° distance * rough path description: Argentina, Chile The occultation path -------------------- * approximate projected width [km]: 51 * 1 sigma uncertainty interval [path widths]: +/- 1.07 * 1 sigma uncertainty interval [seconds]: +/- 4.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .041 +/- .031) * 1 sigma uncertainty ellipse (major, minor, PA): ( .041", .030", 79° ) * approx speed of asteroid's shadow [km/s]: 12.6875 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0116-00502-1 by 1191 Alfaterna on 2008 Dec 5 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 174 0 0 -30 13 35 7 19 31 1 88 -2 -29 59 50 -30 27 22 .. .. .. -30 57 0 175 0 0 -30 12 13 7 19 31 1 88 -3 -29 58 28 -30 26 0 .. .. .. -30 55 38 176 0 0 -30 10 56 7 19 31 2 87 -3 -29 57 11 -30 24 43 .. .. .. -30 54 21 177 0 0 -30 9 43 7 19 30 3 87 -4 -29 55 58 -30 23 31 .. .. .. -30 53 8 178 0 0 -30 8 36 7 19 30 4 86 -5 -29 54 51 -30 22 23 -29 25 33 -30 52 0 179 0 0 -30 7 33 7 19 29 5 86 -6 -29 53 48 -30 21 20 -29 24 30 -30 50 57 180 0 0 -30 6 35 7 19 28 6 85 -6 -29 52 50 -30 20 22 -29 23 32 -30 49 59 -179 0 0 -30 5 41 7 19 27 7 85 -7 -29 51 57 -30 19 28 -29 22 39 -30 49 6 -178 0 0 -30 4 53 7 19 26 7 84 -8 -29 51 8 -30 18 40 -29 21 51 -30 48 17 -177 0 0 -30 4 9 7 19 25 8 84 -9 -29 50 25 -30 17 56 -29 21 7 -30 47 33 -176 0 0 -30 3 31 7 19 23 9 83 -9 -29 49 46 -30 17 17 -29 20 29 -30 46 54 -175 0 0 -30 2 57 7 19 22 10 83 -10 -29 49 12 -30 16 43 -29 19 55 -30 46 20 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46 319 -20 -34 47 8 -35 14 46 -34 17 44 -35 44 30 - 67 0 0 -35 5 14 7 9 3 45 318 -20 -34 51 26 -35 19 4 -34 22 3 -35 48 48 - 66 0 0 -35 9 31 7 8 57 45 317 -19 -34 55 44 -35 23 21 -34 26 20 -35 53 5 - 65 0 0 -35 13 48 7 8 51 44 316 -19 -35 0 0 -35 27 38 -34 30 36 -35 57 21 - 64 0 0 -35 18 3 7 8 45 43 315 -18 -35 4 16 -35 31 53 -34 34 52 -36 1 37 - 63 0 0 -35 22 17 7 8 39 43 314 -17 -35 8 30 -35 36 7 -34 39 6 -36 5 51 - 62 0 0 -35 26 31 7 8 33 42 313 -17 -35 12 43 -35 40 21 -34 43 19 -36 10 4 - 61 0 0 -35 30 43 7 8 28 42 312 -16 -35 16 55 -35 44 32 -34 47 31 -36 14 16 - 60 0 0 -35 34 53 7 8 22 41 311 -16 -35 21 6 -35 48 43 -34 51 42 -36 18 27 - 59 0 0 -35 39 3 7 8 16 40 310 -15 -35 25 15 -35 52 52 -34 55 52 -36 22 36 - 58 0 0 -35 43 11 7 8 11 40 309 -14 -35 29 23 -35 57 0 -35 0 0 -36 26 44 - 57 0 0 -35 47 17 7 8 6 39 308 -14 -35 33 29 -36 1 7 -35 4 6 -36 30 50 - 56 0 0 -35 51 22 7 8 0 38 307 -13 -35 37 34 -36 5 12 -35 8 11 -36 34 55 - 55 0 0 -35 55 25 7 7 55 38 306 -12 -35 41 38 -36 9 15 -35 12 14 -36 38 58 - 54 0 0 -35 59 27 7 7 50 37 305 -12 -35 45 39 -36 13 16 -35 16 16 -36 42 59 - 53 0 0 -36 3 26 7 7 45 36 305 -11 -35 49 39 -36 17 16 -35 20 16 -36 46 59 - 52 0 0 -36 7 24 7 7 40 36 304 -10 -35 53 37 -36 21 14 -35 24 14 -36 50 57 - 51 0 0 -36 11 20 7 7 35 35 303 -10 -35 57 33 -36 25 10 -35 28 10 -36 54 53 - 50 0 0 -36 15 14 7 7 30 34 302 -9 -36 1 27 -36 29 4 -35 32 4 -36 58 47 - 49 0 0 -36 19 6 7 7 26 33 301 -8 -36 5 19 -36 32 56 -35 35 56 -37 2 39 - 48 0 0 -36 22 56 7 7 21 33 300 -8 -36 9 9 -36 36 46 -35 39 46 -37 6 28 - 47 0 0 -36 26 44 7 7 17 32 300 -7 -36 12 57 -36 40 34 -35 43 34 -37 10 16 - 46 0 0 -36 30 30 7 7 12 31 299 -6 -36 16 43 -36 44 19 -35 47 20 -37 14 2 - 45 0 0 -36 34 13 7 7 8 31 298 -6 -36 20 26 -36 48 2 -35 51 4 -37 17 45 - 44 0 0 -36 37 54 7 7 4 30 297 -5 -36 24 7 -36 51 43 -35 54 45 -37 21 26 - 43 0 0 -36 41 33 7 7 0 29 297 -4 -36 27 46 -36 55 22 -35 58 23 -37 25 4 - 42 0 0 -36 45 9 7 6 55 28 296 -4 -36 31 22 -36 58 58 -36 2 0 -37 28 40 - 41 0 0 -36 48 42 7 6 52 28 295 -3 -36 34 55 -37 2 31 -36 5 33 -37 32 13 - 40 0 0 -36 52 13 7 6 48 27 294 -2 -36 38 26 -37 6 2 -36 9 5 -37 35 44 - 39 0 0 -36 55 41 7 6 44 26 294 -1 -36 41 55 -37 9 30 -36 12 33 -37 39 12 - 38 0 0 -36 59 7 7 6 40 25 293 -1 -36 45 20 -37 12 56 -36 15 59 -37 42 38 - 37 0 0 -37 2 30 7 6 37 25 292 0 -36 48 43 -37 16 19 -36 19 22 -37 46 0 Uncertainty in time = +/- 5 secs [Prediction of 2008 Nov 26.0] Data for the target star ------------------------ * name: TYC 0116-00502-1 * constellation : Orion * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 46 57.4299 DE: +01 22 50.536 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .021 ) * V mag [mag]: 10.4 * B mag [mag]: 10.6 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1191) Alfaterna approx. diameter [km]: 42 approx. diameter ["]: .029 distance from Earth [AU]: 2.01400 * orbital information: orbit source: Preston date of fit: 2008 Oct 29 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 596 number of rejected observations: 23 time covered by the observations: 1931 Feb 18 - 2008 Oct 19 1 sigma uncertainty ellipse (major, minor, PA): 0.036, 0.022, 76° remarks: * orbital elements for (1191) Alfaterna : Mean anomaly = 256.03456714 deg Arg. of pericenter = 55.19642419 deg Long. of node = 134.80736891 deg Inclination = 18.47604795 deg Eccentricity = 0.05040131 Semimajor axis = 2.89210307 AU Perihelion dist = 2.74633730 AU Mag: H = 10.74, G = 0.15 Epoch of elements : MJD 54805.30000000 TDT (2008 Dec 05.300) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Dec 5 1191 Alfaterna 7h 12.6m UT 10.4 5 46 57.430 1 22 50.54TYC 0116-00502-1 10.6 15.0 42 3.3 2.014 -2.081 2.21 -95.8709 1.379 69.53 -22.42 7.2098 -0.03930 -0.55916 -7.14341 0.50438 -0.00137 0.00215 2000 254.97248220081130.00000 55.196424134.807369 18.4760480.05040131 2.8921031 2.746337310.6 5.00.15 RATE 2.0039340 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.041 0.030 79 2.07 0.031 0 54796.5020081205_0502-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 26, 23:42 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org