IOTA/IOTA-ES occultation update for (581) Tauntonia / 2UCAC 40003984 event on 2010 Jan 05, 04:04 UT Visible from Africa, Europe Summary ------- On 2010 Jan 05 UT, the 64 km diameter asteroid (581) Tauntonia will occult a 12.7 mag star in the constellation Gemini for observers along a path across Africa, Europe. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.4 mag to 13.8 mag (the magnitude of the asteroid) for at most 4.0 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: 69 * date and approx. time of event: 2010 Jan 05, 04:00 - 2010 Jan 05, 04:08 UT * magnitude of target star: 12.7 * magnitude drop [mag]: 1.4 * estimated maximum duration [s]: 4.0 * Moon: 75 % sunlit, 61° distance * Sun: 179° distance * rough path description: Africa, Europe The occultation path -------------------- * approximate projected width [km]: 98 * 1 sigma uncertainty interval [path widths]: +/- 0.85 * 1 sigma uncertainty interval [seconds]: +/- 3.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .037 +/- .033) * 1 sigma uncertainty ellipse (major, minor, PA): ( .037", .033", 78° ) * approx speed of asteroid's shadow [km/s]: 15.7772 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 40003984 by 581 Tauntonia on 2010 Jan 5 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 32 36 6 20 50 55 4 0 1 6 293 -7 30 43 19 21 22 29 35 20 34 19 56 28 28 13 37 21 57 28 ... .. .. .. .. .. 28 34 12 23 8 42 4 0 8 10 291 -11 27 18 27 23 23 38 29 58 58 22 49 44 25 23 47 23 42 41 33 0 11 22 0 56 25 48 47 24 52 24 4 0 14 13 290 -14 24 45 59 25 1 21 26 56 1 24 41 28 23 7 12 25 12 58 29 4 5 24 16 39 23 34 58 26 21 54 4 0 21 16 289 -16 22 39 10 26 27 30 24 33 36 26 15 1 21 9 45 26 34 34 26 21 20 25 59 41 21 39 36 27 43 3 4 0 28 18 288 -18 20 48 16 27 46 26 22 33 0 27 38 44 19 25 7 27 50 19 24 9 24 27 28 51 19 56 39 28 58 32 4 0 34 19 287 -20 19 8 26 29 0 18 20 46 31 28 56 2 17 49 47 29 1 48 22 15 34 28 49 50 18 22 47 30 9 52 4 0 41 21 286 -22 17 36 51 30 10 23 19 10 5 30 8 44 16 21 34 30 10 0 20 33 58 30 5 15 16 55 54 31 17 59 4 0 48 22 285 -23 16 11 42 31 17 29 17 41 16 31 17 57 14 59 1 31 15 34 19 1 20 31 16 35 15 34 33 32 23 32 4 0 54 24 284 -24 14 51 43 32 22 12 16 18 26 32 24 25 13 41 5 32 18 59 17 35 36 32 24 46 14 17 46 33 27 0 4 1 1 25 283 -26 13 36 0 33 24 57 15 0 28 33 28 38 12 26 59 33 20 35 16 15 22 33 30 25 13 4 45 34 28 41 4 1 8 26 281 -27 12 23 51 34 26 1 13 46 32 34 31 0 11 16 8 34 20 40 14 59 39 34 34 0 11 54 58 35 28 53 4 1 14 27 280 -28 11 14 44 35 25 39 12 35 59 35 31 47 10 8 5 35 19 26 13 47 41 35 35 51 10 47 56 36 27 48 4 1 21 28 279 -29 10 8 15 36 24 5 11 28 22 36 31 13 9 2 26 36 17 4 12 38 56 36 36 15 9 43 17 37 25 37 4 1 28 29 278 -30 9 4 2 37 21 26 10 23 15 37 29 30 7 58 53 37 13 41 11 32 55 37 35 23 8 40 43 38 22 27 4 1 35 30 277 -31 8 1 49 38 17 51 9 20 19 38 26 46 6 57 11 38 9 26 10 29 18 38 33 26 7 40 0 39 18 26 4 1 41 31 276 -32 7 1 21 39 13 27 8 19 19 39 23 9 5 57 6 39 4 24 9 27 46 39 30 32 6 40 54 40 13 40 4 1 48 32 275 -32 6 2 25 40 8 19 7 20 1 40 18 45 4 58 27 39 58 42 8 28 5 40 26 48 5 43 14 41 8 14 4 1 55 33 274 -33 5 4 52 41 2 33 6 22 13 41 13 41 4 1 4 40 52 22 7 30 1 41 22 20 4 46 50 42 2 13 4 2 1 33 273 -34 4 8 32 41 56 13 5 25 45 42 7 59 3 4 48 41 45 30 6 33 25 42 17 14 3 51 34 42 55 41 4 2 8 34 271 -35 3 13 17 42 49 22 4 30 29 43 1 46 2 9 33 42 38 8 5 38 6 43 11 34 2 57 19 43 48 40 4 2 15 35 270 -35 2 18 59 43 42 4 3 36 16 43 55 4 1 15 11 43 30 21 4 43 56 44 5 24 2 3 58 44 41 16 4 2 21 35 269 -36 1 25 32 44 34 22 2 43 0 44 47 57 0 21 35 44 22 11 3 50 48 44 58 47 1 11 24 45 33 29 4 2 28 36 268 -36 0 32 51 45 26 19 1 50 34 45 40 27 - 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Uncertainty in time = +/- 4 secs Prediction of 2009 Dec 27.0 Data for the target star ------------------------ * name: 2UCAC 40003984 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 58 29.3773 DE: +23 24 33.117 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .027 ) * V mag [mag]: 12.7 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (581) Tauntonia approx. diameter [km]: 64 approx. diameter ["]: .041 distance from Earth [AU]: 2.14400 * orbital information: orbit source: Preston date of fit: 2009 Dec 27 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 595 number of rejected observations: 30 time covered by the observations: 1906 Feb 21 - 2009 Dec 15 1 sigma uncertainty ellipse (major, minor, PA): 0.032, 0.019, 74° remarks: * orbital elements for (581) Tauntonia : Mean anomaly = 334.22323716 deg Arg. of pericenter = 28.50650618 deg Long. of node = 102.65726250 deg Inclination = 21.88738199 deg Eccentricity = 0.02980148 Semimajor axis = 3.21310736 AU Perihelion dist = 3.11735201 AU Mag: H = 9.57, G = 0.15 Epoch of elements : MJD 55201.17000000 TDT (2010 Jan 05.170) ------ occelmnt file for Occult BEGIN ----------------------------------- 2010 Jan 5 581 Tauntonia 4h 4.4m UT 12.7 6 58 29.377 23 24 33.122UCAC 40003984 0.0 13.8 64 4.0 2.144 -2.309 17.99 -61.1196 23.405 120.22 -22.63 4.0727 0.37269 0.65836 -7.74959 4.38691 0.00008 -0.00007 2000 334.0230192010 1 4.00000 28.506506102.657262 21.8873820.02980148 3.2131074 3.1173520 9.6 5.00.15 RATE 1.7112610 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.037 0.033 78 1.85 0.035 0 055192.0020100105_003984 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2009 Dec 27, 12:11 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org