IOTA/IOTA-ES occultation update for (43) Ariadne / TYC 1381-00116-1 event on 2009 Dec 04, 00:12 UT Visible from Summary ------- On 2009 Dec 04 UT, the 66 km diameter asteroid (43) Ariadne will occult a 11.5 mag star in the constellation Cancer for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 1.2 mag to 12.2 mag (the magnitude of the asteroid) for at most 16.2 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: 89 * date and approx. time of event: 2009 Dec 04, 23:56 - 2009 Dec 05, 00:28 UT * magnitude of target star: 11.5 * magnitude drop [mag]: 1.2 * estimated maximum duration [s]: 16.2 * Moon: 96 % sunlit, 26° distance * Sun: 131° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 102 * 1 sigma uncertainty interval [path widths]: +/- 0.53 * 1 sigma uncertainty interval [seconds]: +/- 7.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .024 +/- .027) * 1 sigma uncertainty ellipse (major, minor, PA): ( .027", .024", 2° ) * approx speed of asteroid's shadow [km/s]: 4.0658 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1381-00116-1 by 43 Ariadne on 2009 Dec 3 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 - 62 0 0 39 11 31 24 28 38 1 67 -43 39 41 22 38 42 0 40 13 22 .. .. .. - 61 0 0 39 32 39 24 28 38 2 67 -43 40 2 34 39 3 4 40 34 39 .. .. .. - 60 0 0 39 54 0 24 28 36 2 68 -44 40 23 59 39 24 21 40 56 9 .. .. .. - 59 0 0 40 15 33 24 28 34 3 69 -45 40 45 36 39 45 49 41 17 52 .. .. .. - 58 0 0 40 37 17 24 28 32 4 69 -45 41 7 25 40 7 29 41 39 45 39 36 16 - 57 0 0 40 59 12 24 28 29 5 70 -46 41 29 25 40 29 20 42 1 50 39 58 2 - 56 0 0 41 21 18 24 28 26 6 71 -47 41 51 35 40 51 21 42 24 5 40 19 59 - 55 0 0 41 43 32 24 28 22 7 71 -47 42 13 54 41 13 32 42 46 29 40 42 5 - 54 0 0 42 5 56 24 28 18 7 72 -48 42 36 22 41 35 51 43 9 1 41 4 20 - 53 0 0 42 28 27 24 28 13 8 73 -49 42 58 58 41 58 18 43 31 42 41 26 43 - 52 0 0 42 51 6 24 28 8 9 73 -49 43 21 41 42 20 53 43 54 30 41 49 13 - 51 0 0 43 13 52 24 28 2 10 74 -50 43 44 31 42 43 34 44 17 25 42 11 50 - 50 0 0 43 36 43 24 27 56 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260 -9 67 37 35 66 38 22 68 9 32 66 7 31 122 0 0 66 58 18 23 58 54 24 261 -8 67 28 9 66 28 47 68 0 11 65 57 51 123 0 0 66 48 32 23 58 47 24 262 -8 67 18 28 66 18 57 67 50 35 65 47 57 124 0 0 66 38 31 23 58 40 23 263 -7 67 8 31 66 8 51 67 40 43 65 37 47 125 0 0 66 28 14 23 58 33 23 264 -7 66 58 19 65 58 31 67 30 36 65 27 22 126 0 0 66 17 42 23 58 26 22 265 -7 66 47 52 65 47 54 67 20 14 65 16 41 127 0 0 66 6 55 23 58 19 22 266 -6 66 37 9 65 37 2 67 9 36 65 5 44 128 0 0 65 55 51 23 58 12 22 267 -6 66 26 10 65 25 54 66 58 43 64 54 32 129 0 0 65 44 32 23 58 5 21 268 -5 66 14 55 65 14 30 66 47 33 64 43 3 130 0 0 65 32 56 23 57 58 21 269 -5 66 3 24 65 2 50 66 36 7 64 31 18 131 0 0 65 21 4 23 57 51 20 270 -5 65 51 37 64 50 53 66 24 25 64 19 17 132 0 0 65 8 56 23 57 45 20 271 -4 65 39 33 64 38 41 66 12 26 64 7 0 133 0 0 64 56 31 23 57 38 20 271 -4 65 27 12 64 26 11 66 0 10 63 54 26 134 0 0 64 43 49 23 57 31 19 272 -3 65 14 35 64 13 25 65 47 38 63 41 35 135 0 0 64 30 50 23 57 25 19 273 -3 65 1 41 64 0 22 65 34 49 63 28 28 136 0 0 64 17 35 23 57 18 18 274 -2 64 48 30 63 47 2 65 21 43 63 15 4 137 0 0 64 4 2 23 57 12 18 275 -2 64 35 2 63 33 25 65 8 20 63 1 22 138 0 0 63 50 12 23 57 5 17 276 -1 64 21 16 63 19 31 64 54 39 62 47 24 139 0 0 63 36 5 23 56 59 17 277 -1 64 7 13 63 5 20 64 40 41 62 33 8 140 0 0 63 21 40 23 56 53 17 278 -1 63 52 53 62 50 51 64 26 25 62 18 35 141 0 0 63 6 58 23 56 47 16 279 0 63 38 15 62 36 5 64 11 52 62 3 45 Uncertainty in time = +/- 9 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 1381-00116-1 * constellation : Cancer * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 08 10 16.1902 DE: +18 25 49.853 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .025 ) * V mag [mag]: 11.5 * B mag [mag]: 11.9 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (43) Ariadne approx. diameter [km]: 66 approx. diameter ["]: .050 distance from Earth [AU]: 1.81500 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 987 number of rejected observations: 158 time covered by the observations: 1904 Nov 17 - 2007 May 21 1 sigma uncertainty ellipse (major, minor, PA): 0.012, 0.010, 105° remarks: * orbital elements for (43) Ariadne : Mean anomaly = 184.40661872 deg Arg. of pericenter = 15.85828649 deg Long. of node = 264.93011900 deg Inclination = 3.46721562 deg Eccentricity = 0.16784057 Semimajor axis = 2.20337491 AU Perihelion dist = 1.83355922 AU Mag: H = 7.78, G = 0.11 Epoch of elements : MJD 55169.00900000 TDT (2009 Dec 04.009) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Dec 4 43 Ariadne 0h 11.8m UT 11.5 8 10 16.190 18 25 49.85TYC 1381-00116-1 11.9 12.2 66 16.2 1.815 -0.774 -1.69 46.6573 18.432 174.56 -22.23 0.1973 -0.11564 0.75604 -2.26801 -0.34996 -0.00427 0.00104 2000 181.69175520091125.00000 15.858286264.930119 3.4672160.16784057 2.2033749 1.8335592 7.9 5.00.11 RATE 3.0135020 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.027 0.024 2 1.53 0.027 0 54545.5020091204_0116-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 17:20 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org