IOTA/IOTA-ES occultation update for (40) Harmonia / TYC 1911-01425-1 event on 2009 Jan 09, 04:27 UT Visible from Summary ------- On 2009 Jan 09 UT, the 108 km diameter asteroid (40) Harmonia will occult a 12.2 mag star in the constellation Gemini for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 0.1 mag to 9.6 mag (the magnitude of the asteroid) for at most 9.9 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: 2009 Jan 09, 04:23 - 2009 Jan 09, 04:33 UT * magnitude of target star: 12.2 * magnitude drop [mag]: 0.1 * estimated maximum duration [s]: 9.9 * Moon: 94 % sunlit, 32° distance * Sun: 176° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 220 * 1 sigma uncertainty interval [path widths]: +/- 0.20 * 1 sigma uncertainty interval [seconds]: +/- 1.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .023 +/- .023) * 1 sigma uncertainty ellipse (major, minor, PA): ( .023", .023", 93° ) * approx speed of asteroid's shadow [km/s]: 10.8464 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1911-01425-1 by 40 Harmonia on 2009 Jan 9 Centre Star Star Sun Path Limit1 Path Limit2 Error Limit1 Error Limit2 E. Longitude Latitude U.T. Alt Az Alt o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " o ' " o ' " o ' " o ' " Longitude Latitude Longitude Latitude Longitude Latitude Longitude Latitude 46 43 27 41 32 10 4 23 33 4 298 0 41 48 59 43 5 21 ... .. .. .. .. .. 40 21 51 43 27 57 ... .. .. .. .. .. 42 59 49 43 38 16 4 23 41 7 296 -3 39 23 21 44 33 37 48 46 34 41 40 22 38 9 27 44 49 37 ... .. .. .. .. .. 40 29 23 45 9 43 4 23 48 10 294 -6 37 23 42 45 49 33 44 23 30 44 6 16 36 17 7 46 1 43 46 27 40 43 26 7 38 27 49 46 27 25 4 23 56 12 292 -8 35 39 30 46 58 6 41 45 13 45 42 25 34 37 38 47 7 41 43 17 42 45 17 48 36 42 53 47 37 11 4 24 3 13 291 -9 34 5 49 48 1 36 39 40 31 47 2 35 33 7 13 48 9 17 40 59 55 46 44 36 35 9 5 48 41 37 4 24 11 14 289 -10 32 39 52 49 1 24 37 54 12 48 13 57 31 43 38 49 7 36 39 6 14 47 59 54 33 43 23 49 42 10 4 24 18 16 288 -12 31 19 52 49 58 19 36 19 55 49 19 35 30 25 24 50 3 19 37 27 11 49 8 13 32 23 55 50 39 45 4 24 26 17 287 -13 30 4 38 50 52 56 34 54 16 50 21 6 29 11 31 50 56 56 35 58 14 50 11 43 31 9 23 51 34 58 4 24 33 18 286 -14 28 53 18 51 45 40 33 35 12 51 19 29 28 1 12 51 48 49 34 36 46 51 11 40 29 58 55 52 28 15 4 24 40 19 285 -15 27 45 15 52 36 49 32 21 20 52 15 24 26 53 55 52 39 14 33 21 10 52 8 50 28 51 50 53 19 55 4 24 48 19 284 -16 26 39 57 53 26 38 31 11 43 53 9 19 25 49 11 53 28 23 32 10 15 53 3 48 27 47 37 54 10 13 4 24 55 20 283 -16 25 37 2 54 15 17 30 5 40 54 1 34 24 46 40 54 16 27 31 3 15 53 56 57 26 45 54 54 59 21 4 25 3 21 282 -17 24 36 11 55 2 57 29 2 39 54 52 25 23 46 4 55 3 34 29 59 33 54 48 35 25 46 20 55 47 28 4 25 10 22 281 -18 23 37 7 55 49 44 28 2 14 55 42 5 22 47 9 55 49 52 28 58 41 55 38 56 24 48 39 56 34 43 4 25 18 22 279 -19 22 39 39 56 35 45 27 4 7 56 30 43 21 49 43 56 35 25 28 0 16 56 28 10 23 52 39 57 21 11 4 25 25 23 278 -19 21 43 35 57 21 5 26 8 0 57 18 27 20 53 35 57 20 20 27 4 2 57 16 28 22 58 9 58 6 58 4 25 33 23 277 -20 20 48 45 58 5 49 25 13 41 58 5 24 19 58 36 58 4 41 26 9 44 58 3 55 22 4 58 58 52 9 4 25 40 24 276 -20 19 55 1 58 50 1 24 20 58 58 51 40 19 4 37 58 48 31 25 17 11 58 50 39 21 13 0 59 36 49 4 25 48 24 275 -21 19 2 16 59 33 45 23 29 43 59 37 20 18 11 33 59 31 53 24 26 11 59 36 45 20 22 6 60 21 0 4 25 55 25 274 -21 18 10 23 60 17 4 22 39 47 60 22 28 17 19 16 60 14 51 23 36 38 60 22 17 19 32 10 61 4 46 4 26 3 25 273 -22 17 19 15 61 0 0 21 51 4 61 7 8 16 27 41 60 57 28 22 48 23 61 7 19 18 43 7 61 48 11 4 26 10 26 272 -22 16 28 49 61 42 35 21 3 27 61 51 23 15 36 43 61 39 45 22 1 21 61 51 55 17 54 52 62 31 15 4 26 18 26 271 -23 15 38 59 62 24 54 20 16 52 62 35 16 14 46 15 62 21 45 21 15 28 62 36 9 17 7 21 63 14 3 4 26 25 27 270 -23 14 49 39 63 6 57 19 31 15 63 18 50 13 56 15 63 3 30 20 30 37 63 20 2 16 20 29 63 56 36 4 26 32 27 269 -24 14 0 47 63 48 46 18 46 31 64 2 8 13 6 36 63 45 2 19 46 46 64 3 38 15 34 12 64 38 56 4 26 40 27 268 -24 13 12 17 64 30 23 18 2 37 64 45 11 12 17 16 64 26 23 19 3 52 64 46 58 14 48 28 65 21 5 4 26 47 27 267 -24 12 24 5 65 11 51 17 19 31 65 28 2 11 28 9 65 7 34 18 21 53 65 30 6 14 3 12 66 3 5 4 26 55 28 266 -24 11 36 9 65 53 10 16 37 10 66 10 43 10 39 12 65 48 37 17 40 45 66 13 3 13 18 23 66 44 58 4 27 2 28 265 -25 10 48 24 66 34 22 15 55 32 66 53 15 9 50 21 66 29 32 17 0 28 66 55 51 12 33 57 67 26 44 4 27 10 28 264 -25 10 0 46 67 15 29 15 14 36 67 35 40 9 1 31 67 10 23 16 21 0 67 38 31 11 49 52 68 8 26 4 27 17 28 263 -25 9 13 11 67 56 31 14 34 20 68 18 0 8 12 38 67 51 9 15 42 22 68 21 7 11 6 4 68 50 5 4 27 25 28 262 -25 8 25 36 68 37 31 13 54 44 69 0 17 7 23 38 68 31 53 15 4 32 69 3 38 10 22 32 69 31 43 4 27 32 29 261 -26 7 37 56 69 18 29 13 15 46 69 42 32 6 34 27 69 12 35 14 27 32 69 46 7 9 39 14 70 13 20 4 27 40 29 260 -26 6 50 7 69 59 27 12 37 28 70 24 46 5 44 58 69 53 16 13 51 22 70 28 35 8 56 6 70 54 59 4 27 47 29 259 -26 6 2 5 70 40 26 11 59 49 71 7 1 4 55 7 70 33 59 13 16 4 71 11 3 8 13 7 71 36 40 4 27 55 29 258 -26 5 13 44 71 21 27 11 22 51 71 49 19 4 4 49 71 14 43 12 41 40 71 53 34 7 30 15 72 18 25 4 28 2 29 257 -26 4 25 0 72 2 32 10 46 35 72 31 40 3 13 56 71 55 31 12 8 15 72 36 9 6 47 27 73 0 15 4 28 10 29 256 -26 3 35 45 72 43 41 10 11 3 73 14 7 2 22 21 72 36 23 11 35 52 73 18 48 6 4 40 73 42 12 4 28 17 29 255 -26 2 45 55 73 24 56 9 36 19 73 56 40 1 29 57 73 17 20 11 4 38 74 1 34 5 21 53 74 24 17 4 28 25 29 254 -26 1 55 20 74 6 18 9 2 28 74 39 21 0 36 34 73 58 24 10 34 39 74 44 27 4 39 3 75 6 31 4 28 32 29 252 -26 1 3 53 74 47 49 8 29 33 75 22 11 - 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Uncertainty in time = +/- 2 secs [Prediction of 2008 Nov 4.0] Data for the target star ------------------------ * name: TYC 1911-01425-1 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 07 40 08.3029 DE: +23 38 21.038 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .017, .019 ) * V mag [mag]: 12.2 * B mag [mag]: 12.4 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (40) Harmonia approx. diameter [km]: 108 approx. diameter ["]: .113 distance from Earth [AU]: 1.31200 * orbital information: orbit source: Preston date of fit: 2008 Nov 03 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 3760 number of rejected observations: 288 time covered by the observations: 1914 Mar 30 - 2008 Oct 27 1 sigma uncertainty ellipse (major, minor, PA): 0.016, 0.012, 96° remarks: * orbital elements for (40) Harmonia : Mean anomaly = 102.01286644 deg Arg. of pericenter = 269.77216450 deg Long. of node = 94.28623145 deg Inclination = 4.25651780 deg Eccentricity = 0.04635579 Semimajor axis = 2.26754199 AU Perihelion dist = 2.16242829 AU Mag: H = 6.98, G = 0.15 Epoch of elements : MJD 54840.18600000 TDT (2009 Jan 09.186) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jan 9 40 Harmonia 4h 28.3m UT 12.2 7 40 8.303 23 38 21.04TYC 1911-01425-1 12.4 9.6 108 9.9 1.312 -2.851 12.18 -60.8844 23.637 114.70 -22.09 4.4714 0.25875 0.83185 -5.84591 1.81777 -0.00040 -0.00015 2000 101.9591772009 1 9.00000269.772165 94.286231 4.2565180.04635579 2.2675420 2.1624283 7.0 5.00.15 RATE 2.8864970 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.023 0.023 93 1.20 0.023 0 54774.5020090109_1425-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 04, 05:42 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org