IOTA/IOTA-ES occultation update for (476) Hedwig / TYC 7316-01117-1 event on 2008 May 01, 02:07 UT Visible from Brazil, Bolivia, Peru, Ecuador Summary ------- On 2008 May 01 UT, the 117 km diameter asteroid (476) Hedwig will occult a 11.1 mag star in the constellation Lupus for observers along a path across Brazil, Bolivia, Peru, Ecuador. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.3 mag to 12.1 mag (the magnitude of the asteroid) for at most 12.0 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 99 * date and approx. time of event: 2008 May 01, 01:57 - 2008 May 01, 02:18 UT * magnitude of target star: 11.1 * magnitude drop [mag]: 1.3 * estimated maximum duration [s]: 12.0 * Moon: 25 % sunlit, 107° distance * Sun: 160° distance * rough path description: Brazil, Bolivia, Peru, Ecuador The occultation path -------------------- * approximate projected width [km]: 117 * 1 sigma uncertainty interval [path widths]: +/- 0.29 * 1 sigma uncertainty interval [seconds]: +/- 3.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .031 +/- .030) * 1 sigma uncertainty ellipse (major, minor, PA): ( .031", .030", 95° ) * approx speed of asteroid's shadow [km/s]: 9.7413 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7316-01117-1 by 476 Hedwig on 2008 May 1 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 -105 0 0 16 21 24 2 18 46 0 125 -14 .. .. .. 15 42 35 .. .. .. 15 20 4 -104 0 0 15 40 24 2 18 46 1 125 -16 16 19 21 15 1 28 16 41 58 14 38 54 -103 0 0 14 58 56 2 18 46 3 126 -17 15 38 0 14 19 54 16 0 40 13 57 16 -102 0 0 14 17 2 2 18 45 4 126 -18 14 56 11 13 37 54 15 18 55 13 15 13 -101 0 0 13 34 43 2 18 44 5 126 -19 14 13 57 12 55 30 14 36 44 12 32 46 -100 0 0 12 52 0 2 18 43 6 126 -20 13 31 20 12 12 42 13 54 9 11 49 55 - 99 0 0 12 8 55 2 18 41 7 127 -21 12 48 20 11 29 32 13 11 12 11 6 43 - 98 0 0 11 25 29 2 18 39 9 127 -23 12 4 58 10 46 2 12 27 53 10 23 10 - 97 0 0 10 41 44 2 18 37 10 127 -24 11 21 17 10 2 13 11 44 14 9 39 19 - 96 0 0 9 57 41 2 18 34 11 127 -25 10 37 18 9 18 7 11 0 17 8 55 11 - 95 0 0 9 13 22 2 18 32 12 127 -26 9 53 2 8 33 45 10 16 3 8 10 46 - 94 0 0 8 28 49 2 18 28 14 127 -27 9 8 31 7 49 8 9 31 33 7 26 8 - 93 0 0 7 44 2 2 18 25 15 128 -28 8 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78 0 0 - 3 34 40 2 17 0 33 128 -46 - 2 55 8 - 4 14 10 - 2 32 11 - 4 37 5 - 77 0 0 - 4 19 7 2 16 52 34 128 -47 - 3 39 39 - 4 58 34 - 3 16 44 - 5 21 26 - 76 0 0 - 5 3 19 2 16 44 36 128 -48 - 4 23 55 - 5 42 42 - 4 1 3 - 6 5 32 - 75 0 0 - 5 47 15 2 16 36 37 128 -50 - 5 7 55 - 6 26 33 - 4 45 6 - 6 49 20 - 74 0 0 - 6 30 53 2 16 28 38 128 -51 - 5 51 38 - 7 10 7 - 5 28 52 - 7 32 51 - 73 0 0 - 7 14 12 2 16 19 39 128 -52 - 6 35 2 - 7 53 21 - 6 12 19 - 8 16 2 - 72 0 0 - 7 57 11 2 16 11 40 128 -53 - 7 18 6 - 8 36 14 - 6 55 26 - 8 58 53 - 71 0 0 - 8 39 48 2 16 2 42 128 -54 - 8 0 49 - 9 18 46 - 7 38 12 - 9 41 21 - 70 0 0 - 9 22 3 2 15 53 43 128 -55 - 8 43 10 -10 0 55 - 8 20 35 -10 23 27 - 69 0 0 -10 3 53 2 15 43 44 127 -56 - 9 25 6 -10 42 39 - 9 2 36 -11 5 8 - 68 0 0 -10 45 19 2 15 34 45 127 -57 -10 6 38 -11 23 59 - 9 44 11 -11 46 24 - 67 0 0 -11 26 19 2 15 24 46 127 -58 -10 47 44 -12 4 52 -10 25 21 -12 27 13 - 66 0 0 -12 6 52 2 15 15 47 127 -59 -11 28 24 -12 45 18 -11 6 5 -13 7 36 - 65 0 0 -12 46 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250 -23 -31 14 13 -32 21 5 -30 54 49 -32 40 28 43 0 0 -31 30 2 1 59 6 36 249 -22 -30 56 29 -32 3 34 -30 37 1 -32 23 1 44 0 0 -31 11 50 1 59 0 35 249 -21 -30 38 10 -31 45 29 -30 18 39 -32 4 59 45 0 0 -30 53 2 1 58 54 35 248 -20 -30 19 16 -31 26 48 -29 59 40 -31 46 22 46 0 0 -30 33 39 1 58 48 34 248 -19 -29 59 45 -31 7 31 -29 40 5 -31 27 10 47 0 0 -30 13 39 1 58 42 33 247 -18 -29 39 39 -30 47 39 -29 19 55 -31 7 21 48 0 0 -29 53 3 1 58 37 32 247 -17 -29 18 55 -30 27 10 -28 59 7 -30 46 57 49 0 0 -29 31 51 1 58 31 31 246 -16 -28 57 36 -30 6 5 -28 37 43 -30 25 56 50 0 0 -29 10 1 1 58 26 30 246 -16 -28 35 39 -29 44 23 -28 15 42 -30 4 19 51 0 0 -28 47 35 1 58 21 29 245 -15 -28 13 4 -29 22 5 -27 53 3 -29 42 5 52 0 0 -28 24 31 1 58 15 28 245 -14 -27 49 53 -28 59 9 -27 29 47 -29 19 13 53 0 0 -28 0 50 1 58 10 27 245 -13 -27 26 3 -28 35 35 -27 5 52 -28 55 45 54 0 0 -27 36 30 1 58 5 26 244 -12 -27 1 35 -28 11 24 -26 41 20 -28 31 38 55 0 0 -27 11 33 1 58 1 25 244 -11 -26 36 29 -27 46 35 -26 16 9 -28 6 54 56 0 0 -26 45 56 1 57 56 24 243 -10 -26 10 45 -27 21 7 -25 50 20 -27 41 31 57 0 0 -26 19 42 1 57 51 23 243 -9 -25 44 22 -26 55 1 -25 23 51 -27 15 30 58 0 0 -25 52 48 1 57 47 22 242 -8 -25 17 19 -26 28 16 -24 56 44 -26 48 50 59 0 0 -25 25 16 1 57 43 21 242 -7 -24 49 38 -26 0 52 -24 28 57 -26 21 31 60 0 0 -24 57 4 1 57 39 20 242 -6 -24 21 17 -25 32 49 -24 0 32 -25 53 33 61 0 0 -24 28 13 1 57 35 19 241 -5 -23 52 17 -25 4 7 -23 31 26 -25 24 56 62 0 0 -23 58 42 1 57 31 18 241 -4 -23 22 37 -24 34 45 -23 1 41 -24 55 40 63 0 0 -23 28 32 1 57 27 17 240 -3 -22 52 18 -24 4 44 -22 31 17 -24 25 44 64 0 0 -22 57 42 1 57 24 16 240 -2 -22 21 19 -23 34 4 -22 0 12 -23 55 9 65 0 0 -22 26 13 1 57 21 15 240 -1 -21 49 40 -23 2 44 -21 28 28 -23 23 54 66 0 0 -21 54 4 1 57 18 14 239 0 -21 17 22 -22 30 44 -20 56 4 -22 52 0 Uncertainty in time = +/- 4 secs [Prediction of 2008 Apr 23.0] Data for the target star ------------------------ * name: TYC 7316-01117-1 * constellation : Lupus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 15 09 54.4087 DE: -33 25 22.250 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .026 ) * V mag [mag]: 11.1 * B mag [mag]: 11.6 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (476) Hedwig approx. diameter [km]: 117 approx. diameter ["]: .103 distance from Earth [AU]: 1.57000 * orbital information: orbit source: Preston date of fit: 2008 Apr 22 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 739 number of rejected observations: 98 time covered by the observations: 1901 Aug 17 - 2008 Apr 19 1 sigma uncertainty ellipse (major, minor, PA): 0.023, 0.015, 99° remarks: * orbital elements for (476) Hedwig : Mean anomaly = 307.26401750 deg Arg. of pericenter = 1.87832619 deg Long. of node = 286.51184049 deg Inclination = 10.94482276 deg Eccentricity = 0.07447688 Semimajor axis = 2.64930458 AU Perihelion dist = 2.45199263 AU Mag: H = 8.58, G = 0.15 Epoch of elements : MJD 54587.08900000 TDT (2008 May 01.089) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 1 476 Hedwig 2h 7.9m UT 11.1 15 9 54.409-33 25 22.25TYC 7316-01117-1 11.6 12.1 117 12.0 1.570 -2.335 9.74 -23.8723 -33.426 147.31 15.16 2.1311 0.00779 0.02282 -5.21668 1.73699 -0.00087 0.00172 2000 305.6437342008 424.00000 1.878326286.511840 10.9448230.07447688 2.6493046 2.4519926 8.6 5.00.15 RATE 2.2856310 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.031 0.030 95 1.29 0.030 0 54579.5020080501_1117-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 23, 03:40 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org