IOTA/IOTA-ES occultation update for (339) Dorothea / UCAC2 34988026 event on 2009 Jan 02, 01:38 UT Visible from Summary ------- On 2009 Jan 02 UT, the 38 km diameter asteroid (339) Dorothea will occult a 12.0 mag star in the constellation Monoceros for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.0 mag to 13.8 mag (the magnitude of the asteroid) for at most 2.8 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: 22 * date and approx. time of event: 2009 Jan 02, 01:34 - 2009 Jan 02, 01:41 UT * magnitude of target star: 12.0 * magnitude drop [mag]: 2.0 * estimated maximum duration [s]: 2.8 * Moon: 26 % sunlit, 114° distance * Sun: 165° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 83 * 1 sigma uncertainty interval [path widths]: +/- 3.08 * 1 sigma uncertainty interval [seconds]: +/- 8.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .076 +/- .074) * 1 sigma uncertainty ellipse (major, minor, PA): ( .076", .074", 90° ) * approx speed of asteroid's shadow [km/s]: 13.8881 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 34988026 by 339 Dorothea on 2009 Jan 2 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 72 6 11 54 9 0 1 34 32 1 284 -16 66 56 44 54 43 7 ... .. .. .. .. .. 54 59 40 54 51 45 ... .. .. .. .. .. 64 17 57 55 38 13 1 34 37 6 278 -20 61 57 57 55 43 11 67 17 21 55 26 34 52 23 31 55 26 13 ... .. .. .. .. .. 60 13 17 56 29 3 1 34 43 8 274 -23 58 24 34 56 28 26 62 16 44 56 27 14 50 1 44 55 58 2 ... .. .. .. .. .. 57 0 16 57 10 50 1 34 48 10 272 -25 55 26 58 57 7 21 58 42 16 57 12 55 47 50 19 56 27 54 ... .. .. .. .. .. 54 13 56 57 47 50 1 34 53 12 269 -26 52 50 13 57 42 30 55 43 47 57 52 13 45 46 43 56 56 16 71 2 2 57 18 37 51 44 26 58 21 46 1 34 59 13 267 -27 50 27 24 58 15 4 53 6 14 58 27 45 43 49 16 57 23 26 64 43 24 58 33 46 49 26 39 58 53 29 1 35 4 14 265 -29 48 14 37 58 45 45 50 42 38 59 0 41 41 56 45 57 49 34 60 47 54 59 24 6 47 17 35 59 23 33 1 35 9 15 263 -30 46 9 27 59 14 56 48 29 5 59 31 43 40 8 16 58 14 51 57 37 50 60 6 23 45 15 11 59 52 17 1 35 15 16 261 -31 44 10 15 59 42 56 46 23 8 60 1 16 38 23 9 58 39 24 54 52 17 60 44 14 43 18 6 60 19 56 1 35 20 17 259 -31 42 15 48 60 9 56 44 23 7 60 29 37 36 40 50 59 3 18 52 22 28 61 19 10 41 25 17 60 46 39 1 35 25 18 257 -32 40 25 14 60 36 5 42 27 50 60 56 58 35 0 54 59 26 37 50 3 44 61 52 0 39 35 59 61 12 36 1 35 31 18 256 -33 38 37 53 61 1 31 40 36 25 61 23 29 33 22 57 59 49 26 47 53 11 62 23 14 37 49 34 61 37 53 1 35 36 19 254 -34 36 53 10 61 26 18 38 48 9 61 49 16 31 46 43 60 11 46 45 48 57 62 53 11 36 5 33 62 2 33 1 35 41 20 252 -34 35 10 41 61 50 31 37 2 30 62 14 24 30 11 55 60 33 41 43 49 41 63 22 6 34 23 31 62 26 41 1 35 47 20 250 -35 33 30 2 62 14 15 35 19 1 62 38 59 28 38 19 60 55 13 41 54 23 63 50 7 32 43 9 62 50 21 1 35 52 21 249 -36 31 50 55 62 37 30 33 37 19 63 3 4 27 5 45 61 16 23 40 2 17 64 17 24 31 4 8 63 13 34 1 35 57 21 247 -36 30 13 3 63 0 21 31 57 6 63 26 42 25 34 1 61 37 13 38 12 48 64 44 1 29 26 15 63 36 24 1 36 3 22 245 -37 28 36 14 63 22 48 30 18 5 63 49 54 24 2 58 61 57 43 36 25 25 65 10 4 27 49 15 63 58 52 1 36 8 22 244 -37 27 0 14 63 44 55 28 40 2 64 12 44 22 32 28 62 17 57 34 39 44 65 35 37 26 12 56 64 20 59 1 36 14 23 242 -38 25 24 53 64 6 42 27 2 45 64 35 13 21 2 22 62 37 53 32 55 23 66 0 42 24 37 9 64 42 47 1 36 19 23 240 -38 23 50 0 64 28 10 25 26 1 64 57 22 19 32 34 62 57 33 31 12 5 66 25 22 23 1 42 65 4 17 1 36 24 24 239 -38 22 15 26 64 49 20 23 49 40 65 19 12 18 2 58 63 16 58 29 29 32 66 49 39 21 26 28 65 25 31 1 36 30 24 237 -39 20 41 3 65 10 14 22 13 33 65 40 46 16 33 25 63 36 8 27 47 32 67 13 36 19 51 17 65 46 28 1 36 35 24 235 -39 19 6 42 65 30 53 20 37 32 66 2 2 15 3 52 63 55 4 26 5 49 67 37 14 18 16 2 66 7 10 1 36 40 25 233 -39 17 32 17 65 51 16 19 1 26 66 23 4 13 34 12 64 13 46 24 24 13 68 0 34 16 40 35 66 27 37 1 36 46 25 232 -40 15 57 39 66 11 25 17 25 9 66 43 50 12 4 20 64 32 14 22 42 31 68 23 36 15 4 48 66 47 50 1 36 51 25 230 -40 14 22 42 66 31 19 15 48 33 67 4 22 10 34 10 64 50 30 21 0 32 68 46 23 13 28 36 67 7 48 1 36 56 26 228 -40 12 47 19 66 51 0 14 11 30 67 24 39 9 3 39 65 8 32 19 18 6 69 8 55 11 51 50 67 27 34 1 37 2 26 226 -40 11 11 24 67 10 27 12 33 52 67 44 43 7 32 39 65 26 22 17 35 3 69 31 12 10 14 24 67 47 5 1 37 7 26 225 -41 9 34 50 67 29 41 10 55 34 68 4 34 6 1 8 65 43 59 15 51 12 69 53 15 8 36 12 68 6 24 1 37 12 26 223 -41 7 57 31 67 48 42 9 16 28 68 24 11 4 29 0 66 1 24 14 6 24 70 15 4 6 57 6 68 25 29 1 37 18 26 221 -41 6 19 20 68 7 29 7 36 26 68 43 34 2 56 10 66 18 36 12 20 28 70 36 40 5 17 0 68 44 22 1 37 23 26 219 -41 4 40 12 68 26 4 5 55 22 69 2 45 1 22 34 66 35 35 10 33 14 70 58 2 3 35 47 69 3 0 1 37 28 27 217 -41 2 59 59 68 44 25 4 13 8 69 21 42 - 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Uncertainty in time = +/- 9 secs [Prediction of 2008 Nov 4.0] Data for the target star ------------------------ * name: UCAC2 34988026 * constellation : Monoceros * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 26 17.7223 DE: +09 22 39.278 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .072, .072 ) * V mag [mag]: 12.0 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (339) Dorothea approx. diameter [km]: 38 approx. diameter ["]: .024 distance from Earth [AU]: 2.19100 * orbital information: orbit source: Preston date of fit: 2008 Nov 03 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 792 number of rejected observations: 82 time covered by the observations: 1902 Aug 07 - 2008 Oct 19 1 sigma uncertainty ellipse (major, minor, PA): 0.026, 0.017, 91° remarks: * orbital elements for (339) Dorothea : Mean anomaly = 113.96122583 deg Arg. of pericenter = 160.88274594 deg Long. of node = 173.77816408 deg Inclination = 9.92821472 deg Eccentricity = 0.09481516 Semimajor axis = 3.01420079 AU Perihelion dist = 2.72840886 AU Mag: H = 9.31, G = 0.15 Epoch of elements : MJD 54833.06800000 TDT (2009 Jan 02.068) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jan 2 339 Dorothea 1h 38.0m UT 12.0 6 26 17.722 9 22 39.28UCAC2 34988026 0.0 13.8 38 2.8 2.191 -2.104 4.49 -29.7612 9.377 156.49 -22.92 1.6335 0.12657 0.87899 -7.75861 1.11850 0.00062 0.00142 2000 113.38339520081230.00000160.882746173.778164 9.9282150.09481516 3.0142008 2.7284089 9.2 5.00.15 RATE 1.8834140 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.076 0.074 90 4.08 0.074 0 54774.5020090102_988026 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 04, 05:04 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org