IOTA/IOTA-ES occultation update for (1241) Dysona / TYC 3384-00986-1 event on 2009 Dec 04, 07:03 UT Visible from Summary ------- On 2009 Dec 04 UT, the 83 km diameter asteroid (1241) Dysona will occult a 10.9 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 4.1 mag to 14.9 mag (the magnitude of the asteroid) for at most 6.1 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: . The event at a glimpse ---------------------- * Rank: 43 * date and approx. time of event: 2009 Dec 04, 06:55 - 2009 Dec 04, 07:09 UT * magnitude of target star: 10.9 * magnitude drop [mag]: 4.1 * estimated maximum duration [s]: 6.1 * Moon: 95 % sunlit, 26° distance * Sun: 146° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 89 * 1 sigma uncertainty interval [path widths]: +/- 1.50 * 1 sigma uncertainty interval [seconds]: +/- 5.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .064 +/- .065) * 1 sigma uncertainty ellipse (major, minor, PA): ( .065", .064", 2° ) * approx speed of asteroid's shadow [km/s]: 13.5523 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 3384-00986-1 by 1241 Dysona on 2009 Dec 4 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 166 0 0 17 16 52 7 9 10 0 37 -12 17 56 15 .. .. .. 19 56 1 .. .. .. 167 0 0 18 32 31 7 9 9 2 38 -13 19 12 7 17 53 11 21 12 34 .. .. .. 168 0 0 19 48 14 7 9 9 3 38 -14 20 28 1 19 8 42 22 29 6 .. .. .. 169 0 0 21 3 54 7 9 8 5 38 -15 21 43 52 20 24 12 23 45 32 18 26 34 170 0 0 22 19 26 7 9 6 7 39 -17 22 59 34 21 39 34 25 1 45 19 41 29 171 0 0 23 34 43 7 9 5 8 39 -18 24 15 0 22 54 43 26 17 38 20 56 14 172 0 0 24 49 41 7 9 2 10 40 -19 25 30 5 24 9 33 27 33 7 22 10 44 173 0 0 26 4 12 7 9 0 11 40 -20 26 44 43 25 23 58 28 48 5 23 24 52 174 0 0 27 18 12 7 8 57 13 41 -22 27 58 48 26 37 53 30 2 26 24 38 33 175 0 0 28 31 34 7 8 54 14 41 -23 29 12 14 27 51 12 31 16 5 25 51 41 176 0 0 29 44 14 7 8 51 16 42 -24 30 24 57 29 3 50 32 28 55 27 4 12 177 0 0 30 56 7 7 8 47 17 42 -25 31 36 50 30 15 41 33 40 54 28 16 1 178 0 0 32 7 7 7 8 43 19 43 -26 32 47 50 31 26 41 34 51 54 29 27 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55 42 15 6 58 23 56 284 -22 56 17 10 55 7 32 58 3 14 53 24 30 - 23 0 0 55 5 34 6 58 17 55 285 -21 55 40 48 54 30 32 57 27 51 52 46 36 - 22 0 0 54 27 40 6 58 11 54 287 -21 55 3 13 53 52 19 56 51 16 52 7 29 - 21 0 0 53 48 32 6 58 5 54 288 -20 54 24 25 53 12 53 56 13 26 51 27 9 - 20 0 0 53 8 9 6 57 59 53 290 -19 53 44 21 52 32 12 55 34 20 50 45 34 - 19 0 0 52 26 30 6 57 52 52 291 -19 53 3 0 51 50 14 54 53 57 50 2 43 - 18 0 0 51 43 32 6 57 46 51 292 -18 52 20 20 51 6 58 54 12 15 49 18 35 - 17 0 0 50 59 14 6 57 39 50 294 -17 51 36 21 50 22 23 53 29 11 48 33 8 - 16 0 0 50 13 36 6 57 33 50 295 -16 50 51 0 49 36 27 52 44 46 47 46 23 - 15 0 0 49 26 37 6 57 26 49 296 -16 50 4 18 48 49 11 51 58 57 46 58 17 - 14 0 0 48 38 14 6 57 19 48 297 -15 49 16 12 48 0 32 51 11 44 46 8 51 - 13 0 0 47 48 29 6 57 13 47 299 -14 48 26 43 47 10 31 50 23 5 45 18 4 - 12 0 0 46 57 20 6 57 6 46 300 -13 47 35 49 46 19 6 49 33 0 44 25 55 - 11 0 0 46 4 47 6 56 59 45 301 -12 46 43 31 45 26 19 48 41 28 43 32 25 - 10 0 0 45 10 50 6 56 52 44 302 -11 45 49 49 44 32 8 47 48 29 42 37 34 - 9 0 0 44 15 29 6 56 45 43 303 -10 44 54 41 43 36 34 46 54 4 41 41 22 - 8 0 0 43 18 46 6 56 38 42 304 -9 43 58 10 42 39 38 45 58 11 40 43 50 - 7 0 0 42 20 39 6 56 31 40 305 -8 43 0 15 41 41 20 45 0 52 39 44 59 - 6 0 0 41 21 11 6 56 24 39 306 -7 42 0 58 40 41 42 44 2 8 38 44 50 - 5 0 0 40 20 24 6 56 17 38 307 -6 41 0 20 39 40 45 43 2 0 37 43 25 - 4 0 0 39 18 17 6 56 10 37 308 -5 39 58 22 38 38 30 42 0 29 36 40 46 - 3 0 0 38 14 55 6 56 4 36 309 -4 38 55 7 37 35 0 40 57 37 35 36 55 - 2 0 0 37 10 19 6 55 57 34 310 -3 37 50 37 36 30 18 39 53 26 34 31 54 - 1 0 0 36 4 31 6 55 50 33 310 -1 36 44 54 35 24 25 38 47 59 33 25 46 0 0 0 34 57 35 6 55 44 32 311 0 35 38 3 34 17 25 37 41 19 32 18 35 Uncertainty in time = +/- 9 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 3384-00986-1 * constellation : Auriga * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 27 48.9743 DE: +49 28 00.331 * position source: mpos:TYC pm:TYC * standard error: RA,DE ["]: ( .057, .061 ) * V mag [mag]: 10.9 * B mag [mag]: 11.3 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1241) Dysona approx. diameter [km]: 83 approx. diameter ["]: .043 distance from Earth [AU]: 2.64100 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 641 number of rejected observations: 39 time covered by the observations: 1920 Mar 10 - 2007 Nov 20 1 sigma uncertainty ellipse (major, minor, PA): 0.029, 0.022, 110° remarks: * orbital elements for (1241) Dysona : Mean anomaly = 158.39608184 deg Arg. of pericenter = 321.35306997 deg Long. of node = 322.33273055 deg Inclination = 23.55425743 deg Eccentricity = 0.10483820 Semimajor axis = 3.18524572 AU Perihelion dist = 2.85131028 AU Mag: H = 9.44, G = 0.15 Epoch of elements : MJD 55169.29400000 TDT (2009 Dec 04.294) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Dec 4 1241 Dysona 7h 1.8m UT 10.9 6 27 48.974 49 28 0.33TYC 3384-00986-1 11.3 14.9 83 6.1 2.641 -2.599 2.75 -81.7308 49.466 72.10 -22.26 7.0302 0.03772 0.34610 -7.60426 0.82891 -0.00249 -0.00232 2000 156.78472320091125.00000321.353070322.332731 23.5542570.10483820 3.1852457 2.8513103 9.5 5.00.15 RATE 1.7337630 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.065 0.064 2 2.50 0.065 0 54545.5020091204_0986-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 17:21 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org