IOTA/IOTA-ES occultation update for (657) Gunlod / TYC 2403-00016-1 event on 2009 Jan 02, 23:33 UT Visible from Summary ------- On 2009 Jan 02 UT, the 40 km diameter asteroid (657) Gunlod will occult a 11.4 mag star in the constellation Auriga for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 3.3 mag to 14.6 mag (the magnitude of the asteroid) for at most 3.5 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: 69 * date and approx. time of event: 2009 Jan 02, 23:25 - 2009 Jan 02, 23:42 UT * magnitude of target star: 11.4 * magnitude drop [mag]: 3.3 * estimated maximum duration [s]: 3.5 * Moon: 34 % sunlit, 90° distance * Sun: 160° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 42 * 1 sigma uncertainty interval [path widths]: +/- 0.86 * 1 sigma uncertainty interval [seconds]: +/- 3.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .043 +/- .026) * 1 sigma uncertainty ellipse (major, minor, PA): ( .043", .026", 94° ) * approx speed of asteroid's shadow [km/s]: 11.4676 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 2403-00016-1 by 657 Gunlod on 2009 Jan 2 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 - 87 0 0 6 27 12 23 42 17 19 60 0 6 41 9 6 13 17 7 5 10 5 49 23 - 86 0 0 7 10 41 23 42 13 20 60 -1 7 24 40 6 56 44 7 48 46 6 32 45 - 85 0 0 7 54 28 23 42 9 21 60 -3 8 8 30 7 40 28 8 32 40 7 16 26 - 84 0 0 8 38 31 23 42 4 22 60 -4 8 52 35 8 24 29 9 16 49 8 0 23 - 83 0 0 9 22 49 23 42 0 24 61 -5 9 36 55 9 8 44 10 1 12 8 44 34 - 82 0 0 10 7 19 23 41 55 25 61 -6 10 21 27 9 53 12 10 45 48 9 28 59 - 81 0 0 10 52 0 23 41 49 26 61 -7 11 6 10 10 37 52 11 30 35 10 13 35 - 80 0 0 11 36 51 23 41 44 27 61 -8 11 51 3 11 22 41 12 15 31 10 58 21 - 79 0 0 12 21 50 23 41 38 28 62 -10 12 36 4 12 7 38 13 0 35 11 43 15 - 78 0 0 13 6 55 23 41 32 30 62 -11 13 21 10 12 52 42 13 45 44 12 28 16 - 77 0 0 13 52 5 23 41 26 31 62 -12 14 6 21 13 37 50 14 30 58 13 13 22 - 76 0 0 14 37 17 23 41 20 32 63 -13 14 51 35 14 23 1 15 16 14 13 58 30 - 75 0 0 15 22 31 23 41 13 33 63 -14 15 36 50 15 8 13 16 1 31 14 43 41 - 74 0 0 16 7 43 23 41 6 34 64 -15 16 22 4 15 53 25 16 46 46 15 28 50 - 73 0 0 16 52 54 23 40 59 35 64 -16 17 7 15 16 38 34 17 31 59 16 13 58 - 72 0 0 17 38 0 23 40 52 37 64 -18 17 52 22 17 23 40 18 17 8 16 59 3 - 71 0 0 18 23 1 23 40 45 38 65 -19 18 37 24 18 8 40 19 2 11 17 44 1 - 70 0 0 19 7 54 23 40 37 39 66 -20 19 22 17 18 53 33 19 47 5 18 28 53 - 69 0 0 19 52 39 23 40 30 40 66 -21 20 7 2 19 38 16 20 31 51 19 13 37 - 68 0 0 20 37 12 23 40 22 41 67 -22 20 51 36 20 22 50 21 16 25 19 58 10 - 67 0 0 21 21 34 23 40 14 42 67 -23 21 35 58 21 7 11 22 0 47 20 42 31 - 66 0 0 22 5 41 23 40 6 43 68 -24 22 20 5 21 51 19 22 44 54 21 26 39 - 65 0 0 22 49 34 23 39 58 44 69 -25 23 3 57 22 35 12 23 28 46 22 10 32 - 64 0 0 23 33 10 23 39 50 46 69 -26 23 47 33 23 18 48 24 12 21 22 54 8 - 63 0 0 24 16 27 23 39 41 47 70 -27 24 30 50 24 2 6 24 55 37 23 37 27 - 62 0 0 24 59 25 23 39 33 48 71 -28 25 13 47 24 45 4 25 38 33 24 20 27 - 61 0 0 25 42 2 23 39 24 49 72 -29 25 56 23 25 27 42 26 21 8 25 3 6 - 60 0 0 26 24 17 23 39 16 50 73 -30 26 38 37 26 9 58 27 3 21 25 45 23 - 59 0 0 27 6 9 23 39 7 51 74 -31 27 20 28 26 51 50 27 45 9 26 27 18 - 58 0 0 27 47 35 23 38 58 52 75 -32 28 1 54 27 33 19 28 26 33 27 8 48 - 57 0 0 28 28 37 23 38 50 53 76 -33 28 42 54 28 14 21 29 7 31 27 49 53 - 56 0 0 29 9 11 23 38 41 54 77 -34 29 23 27 28 54 57 29 48 2 28 30 31 - 55 0 0 29 49 18 23 38 32 55 78 -35 30 3 32 29 35 6 30 28 4 29 10 42 - 54 0 0 30 28 57 23 38 23 56 79 -36 30 43 9 30 14 46 31 7 38 29 50 25 - 53 0 0 31 8 5 23 38 14 57 80 -37 31 22 16 30 53 56 31 46 42 30 29 39 - 52 0 0 31 46 44 23 38 5 57 82 -38 32 0 52 31 32 36 32 25 15 31 8 22 - 51 0 0 32 24 51 23 37 56 58 83 -39 32 38 57 32 10 46 33 3 17 31 46 35 - 50 0 0 33 2 26 23 37 47 59 84 -39 33 16 31 32 48 23 33 40 47 32 24 16 - 49 0 0 33 39 29 23 37 39 60 86 -40 33 53 32 33 25 28 34 17 44 33 1 25 - 48 0 0 34 15 59 23 37 30 61 87 -41 34 29 59 34 2 1 34 54 7 33 38 1 - 47 0 0 34 51 56 23 37 21 62 89 -42 35 5 53 34 38 0 35 29 57 34 14 4 - 46 0 0 35 27 18 23 37 12 63 91 -43 35 41 13 35 13 24 36 5 13 34 49 33 - 45 0 0 36 2 6 23 37 3 63 92 -43 36 15 59 35 48 15 36 39 54 35 24 28 - 44 0 0 36 36 20 23 36 54 64 94 -44 36 50 10 36 22 31 37 14 0 35 58 49 - 43 0 0 37 9 58 23 36 46 65 96 -45 37 23 45 36 56 12 37 47 31 36 32 34 - 42 0 0 37 43 1 23 36 37 65 98 -46 37 56 45 37 29 17 38 20 26 37 5 44 - 41 0 0 38 15 28 23 36 28 66 100 -46 38 29 10 38 1 47 38 52 46 37 38 19 - 40 0 0 38 47 19 23 36 20 67 102 -47 39 0 58 38 33 42 39 24 29 38 10 19 - 39 0 0 39 18 35 23 36 11 67 104 -48 39 32 11 39 5 1 39 55 37 38 41 42 - 38 0 0 39 49 15 23 36 3 68 107 -48 40 2 48 39 35 43 40 26 9 39 12 30 - 37 0 0 40 19 19 23 35 54 68 109 -49 40 32 49 40 5 50 40 56 4 39 42 42 - 36 0 0 40 48 47 23 35 46 69 111 -50 41 2 13 40 35 21 41 25 24 40 12 18 - 35 0 0 41 17 39 23 35 37 69 114 -50 41 31 2 41 4 16 41 54 7 40 41 18 - 34 0 0 41 45 55 23 35 29 70 117 -51 41 59 15 41 32 35 42 22 15 41 9 43 - 33 0 0 42 13 35 23 35 21 70 119 -51 42 26 52 42 0 19 42 49 47 41 37 32 - 32 0 0 42 40 40 23 35 13 71 122 -52 42 53 54 42 27 26 43 16 43 42 4 45 - 31 0 0 43 7 9 23 35 5 71 125 -52 43 20 20 42 53 59 43 43 3 42 31 23 - 30 0 0 43 33 3 23 34 57 71 128 -53 43 46 11 43 19 56 44 8 49 42 57 25 - 29 0 0 43 58 21 23 34 49 72 131 -53 44 11 26 43 45 18 44 33 59 43 22 52 - 28 0 0 44 23 5 23 34 41 72 134 -54 44 36 7 44 10 5 44 58 34 43 47 45 - 27 0 0 44 47 15 23 34 33 72 137 -54 45 0 13 44 34 17 45 22 35 44 12 3 - 26 0 0 45 10 49 23 34 26 72 140 -55 45 23 45 44 57 55 45 46 1 44 35 46 - 25 0 0 45 33 50 23 34 18 72 143 -55 45 46 42 45 20 59 46 8 53 44 58 55 - 24 0 0 45 56 17 23 34 11 72 146 -56 46 9 6 45 43 29 46 31 11 45 21 31 - 23 0 0 46 18 11 23 34 3 72 150 -56 46 30 57 46 5 26 46 52 56 45 43 32 - 22 0 0 46 39 31 23 33 56 72 153 -56 46 52 14 46 26 49 47 14 8 46 5 1 - 21 0 0 47 0 18 23 33 49 72 156 -57 47 12 58 46 47 39 47 34 47 46 25 57 - 20 0 0 47 20 33 23 33 41 72 159 -57 47 33 10 47 7 57 47 54 54 46 46 20 - 19 0 0 47 40 16 23 33 34 72 162 -57 47 52 49 47 27 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33 19 23 29 27 55 242 -56 54 44 38 54 22 1 55 4 8 54 2 36 25 0 0 54 34 6 23 29 22 54 243 -56 54 45 25 54 22 48 55 4 54 54 3 23 26 0 0 54 34 31 23 29 18 54 244 -56 54 45 50 54 23 13 55 5 19 54 3 49 27 0 0 54 34 34 23 29 13 53 245 -55 54 45 53 54 23 16 55 5 22 54 3 52 28 0 0 54 34 15 23 29 8 53 246 -55 54 45 33 54 22 57 55 5 2 54 3 32 29 0 0 54 33 33 23 29 4 52 247 -55 54 44 52 54 22 15 55 4 21 54 2 50 30 0 0 54 32 29 23 28 59 52 249 -55 54 43 48 54 21 11 55 3 18 54 1 46 31 0 0 54 31 3 23 28 54 51 250 -54 54 42 22 54 19 45 55 1 52 54 0 19 32 0 0 54 29 15 23 28 50 51 251 -54 54 40 34 54 17 56 55 0 5 53 58 30 33 0 0 54 27 4 23 28 45 50 252 -54 54 38 24 54 15 45 54 57 55 53 56 18 34 0 0 54 24 31 23 28 41 50 253 -53 54 35 51 54 13 11 54 55 23 53 53 43 35 0 0 54 21 35 23 28 36 49 254 -53 54 32 56 54 10 14 54 52 29 53 50 46 36 0 0 54 18 16 23 28 32 49 255 -53 54 29 38 54 6 55 54 49 12 53 47 26 37 0 0 54 14 35 23 28 28 48 256 -52 54 25 58 54 3 14 54 45 33 53 43 42 38 0 0 54 10 31 23 28 23 48 257 -52 54 21 55 53 59 9 54 41 31 53 39 36 39 0 0 54 6 4 23 28 19 47 258 -51 54 17 28 53 54 41 54 37 7 53 35 7 40 0 0 54 1 14 23 28 15 47 259 -51 54 12 39 53 49 50 54 32 19 53 30 14 41 0 0 53 56 1 23 28 10 46 260 -51 54 7 27 53 44 35 54 27 9 53 24 58 42 0 0 53 50 24 23 28 6 45 261 -50 54 1 51 53 38 57 54 21 35 53 19 18 43 0 0 53 44 23 23 28 2 45 262 -50 53 55 52 53 32 55 54 15 37 53 13 14 44 0 0 53 37 59 23 27 57 44 263 -49 53 49 28 53 26 30 54 9 16 53 6 47 45 0 0 53 31 10 23 27 53 44 264 -49 53 42 41 53 19 40 54 2 32 52 59 55 46 0 0 53 23 58 23 27 49 43 265 -49 53 35 30 53 12 26 53 55 23 52 52 38 47 0 0 53 16 21 23 27 45 43 266 -48 53 27 55 53 4 48 53 47 50 52 44 57 48 0 0 53 8 19 23 27 41 42 267 -48 53 19 55 52 56 44 53 39 52 52 36 51 49 0 0 52 59 52 23 27 37 41 268 -47 53 11 29 52 48 16 53 31 30 52 28 20 50 0 0 52 51 1 23 27 32 41 269 -47 53 2 39 52 39 23 53 22 43 52 19 24 51 0 0 52 41 43 23 27 28 40 269 -46 52 53 24 52 30 3 53 13 31 52 10 1 52 0 0 52 32 0 23 27 24 40 270 -46 52 43 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21 48 54 41 67 0 0 49 11 9 23 26 27 30 283 -38 49 23 27 48 58 51 49 44 40 48 37 44 68 0 0 48 53 48 23 26 23 29 284 -37 49 6 10 48 41 28 49 27 27 48 20 16 69 0 0 48 35 56 23 26 19 29 285 -37 48 48 21 48 23 33 49 9 43 48 2 16 70 0 0 48 17 32 23 26 16 28 286 -36 48 29 59 48 5 5 48 51 27 47 43 43 71 0 0 47 58 34 23 26 13 27 287 -36 48 11 5 47 46 5 48 32 38 47 24 38 72 0 0 47 39 4 23 26 9 26 287 -35 47 51 38 47 26 31 48 13 16 47 4 59 73 0 0 47 19 0 23 26 6 26 288 -34 47 31 37 47 6 24 47 53 21 46 44 46 74 0 0 46 58 22 23 26 2 25 289 -34 47 11 2 46 45 43 47 32 52 46 23 59 75 0 0 46 37 10 23 25 59 24 290 -33 46 49 53 46 24 27 47 11 48 46 2 38 76 0 0 46 15 22 23 25 56 23 290 -32 46 28 9 46 2 37 46 50 10 45 40 42 77 0 0 45 53 0 23 25 53 23 291 -32 46 5 50 45 40 11 46 27 57 45 18 11 78 0 0 45 30 2 23 25 50 22 292 -31 45 42 55 45 17 9 46 5 8 44 55 3 79 0 0 45 6 28 23 25 47 21 293 -30 45 19 24 44 53 32 45 41 43 44 31 20 80 0 0 44 42 17 23 25 44 20 293 -30 44 55 17 44 29 18 45 17 41 44 7 0 81 0 0 44 17 29 23 25 41 20 294 -29 44 30 33 44 4 27 44 53 3 43 42 3 82 0 0 43 52 5 23 25 38 19 295 -28 44 5 12 43 38 59 44 27 48 43 16 29 83 0 0 43 26 2 23 25 36 18 296 -27 43 39 13 43 12 53 44 1 55 42 50 17 84 0 0 42 59 22 23 25 33 17 296 -26 43 12 36 42 46 9 43 35 25 42 23 28 85 0 0 42 32 4 23 25 30 16 297 -26 42 45 21 42 18 47 43 8 16 41 56 0 86 0 0 42 4 7 23 25 28 15 298 -25 42 17 28 41 50 47 42 40 28 41 27 54 87 0 0 41 35 31 23 25 26 14 298 -24 41 48 56 41 22 8 42 12 2 40 59 9 88 0 0 41 6 17 23 25 24 14 299 -23 41 19 45 40 52 50 41 42 57 40 29 45 89 0 0 40 36 23 23 25 21 13 300 -22 40 49 55 40 22 53 41 13 13 39 59 42 90 0 0 40 5 50 23 25 19 12 300 -22 40 19 25 39 52 16 40 42 49 39 28 59 91 0 0 39 34 37 23 25 18 11 301 -21 39 48 16 39 21 0 40 11 46 38 57 37 92 0 0 39 2 45 23 25 16 10 302 -20 39 16 27 38 49 5 39 40 3 38 25 36 93 0 0 38 30 14 23 25 14 9 302 -19 38 43 59 38 16 30 39 7 41 37 52 55 94 0 0 37 57 2 23 25 13 8 303 -18 38 10 51 37 43 15 38 34 38 37 19 35 95 0 0 37 23 11 23 25 11 7 303 -17 37 37 3 37 9 21 38 0 56 36 45 35 96 0 0 36 48 41 23 25 10 6 304 -16 37 2 36 36 34 47 37 26 35 36 10 56 97 0 0 36 13 31 23 25 9 5 305 -15 36 27 29 35 59 34 36 51 34 35 35 37 98 0 0 35 37 42 23 25 9 4 305 -14 35 51 43 35 23 42 36 15 53 34 59 40 99 0 0 35 1 14 23 25 8 3 306 -13 35 15 19 34 47 11 35 39 34 34 23 4 100 0 0 34 24 8 23 25 7 2 306 -12 34 38 15 34 10 2 35 2 35 33 45 50 101 0 0 33 46 24 23 25 7 1 307 -11 34 0 34 33 32 15 34 24 59 33 7 58 Uncertainty in time = +/- 4 secs [Prediction of 2008 Nov 4.0] Data for the target star ------------------------ * name: TYC 2403-00016-1 * constellation : Auriga * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 32 39.2433 DE: +30 37 19.688 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .018 ) * V mag [mag]: 11.4 * B mag [mag]: 11.8 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (657) Gunlod approx. diameter [km]: 40 approx. diameter ["]: .034 distance from Earth [AU]: 1.64000 * orbital information: orbit source: Preston date of fit: 2008 Nov 03 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 755 number of rejected observations: 52 time covered by the observations: 1908 Jan 23 - 2008 Oct 17 1 sigma uncertainty ellipse (major, minor, PA): 0.036, 0.019, 96° remarks: * orbital elements for (657) Gunlod : Mean anomaly = 281.27428215 deg Arg. of pericenter = 244.81950952 deg Long. of node = 297.75512888 deg Inclination = 10.22166399 deg Eccentricity = 0.11503517 Semimajor axis = 2.61067691 AU Perihelion dist = 2.31035725 AU Mag: H = 10.99, G = 0.15 Epoch of elements : MJD 54833.98200000 TDT (2009 Jan 02.982) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jan 2 657 Gunlod 23h 34.0m UT 11.4 5 32 39.243 30 37 19.69TYC 2403-00016-1 11.8 14.6 40 3.5 1.640 -2.493 -12.98 -13.0591 30.626 -172.39 -22.83 23.5660 -0.11153 0.27571 -6.00327 -2.41981 0.00194 -0.00062 2000 280.34386920081230.00000244.819510297.755129 10.2216640.11503517 2.6106769 2.310357210.9 5.00.15 RATE 2.3365470 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.043 0.026 94 1.86 0.029 0 54774.5020090102_0016-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 04, 05:07 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org