IOTA/IOTA-ES occultation update for (14) Irene / UCAC2 32045222 event on 2009 Apr 03, 23:48 UT Visible from Summary ------- On 2009 Apr 03 UT, the 182 km diameter asteroid (14) Irene will occult a 11.8 mag star in the constellation Virgo 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 9.1 mag (the magnitude of the asteroid) for at most 27.4 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: 99 * date and approx. time of event: 2009 Apr 03, 23:34 - 2009 Apr 04, 00:03 UT * magnitude of target star: 11.8 * magnitude drop [mag]: 0.1 * estimated maximum duration [s]: 27.4 * Moon: 65 % sunlit, 92° distance * Sun: 155° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 196 * 1 sigma uncertainty interval [path widths]: +/- 0.28 * 1 sigma uncertainty interval [seconds]: +/- 8.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .060 +/- .057) * 1 sigma uncertainty ellipse (major, minor, PA): ( .060", .057", 94° ) * approx speed of asteroid's shadow [km/s]: 6.6452 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 32045222 by 14 Irene on 2009 Apr 3 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 - 66 0 0 - 2 44 19 24 3 42 0 90 -24 - 1 51 10 - 3 37 47 - 1 21 33 - 4 7 53 - 65 0 0 - 2 44 7 24 3 42 1 89 -25 - 1 51 0 - 3 37 35 - 1 21 23 - 4 7 41 - 64 0 0 - 2 44 19 24 3 41 2 89 -26 - 1 51 11 - 3 37 46 - 1 21 35 - 4 7 52 - 63 0 0 - 2 44 52 24 3 41 3 89 -27 - 1 51 45 - 3 38 20 - 1 22 9 - 4 8 25 - 62 0 0 - 2 45 48 24 3 39 4 89 -28 - 1 52 42 - 3 39 15 - 1 23 5 - 4 9 20 - 61 0 0 - 2 47 7 24 3 38 5 89 -29 - 1 54 0 - 3 40 34 - 1 24 24 - 4 10 39 - 60 0 0 - 2 48 47 24 3 36 6 89 -30 - 1 55 40 - 3 42 14 - 1 26 4 - 4 12 19 - 59 0 0 - 2 50 50 24 3 34 7 89 -31 - 1 57 43 - 3 44 17 - 1 28 6 - 4 14 22 - 58 0 0 - 2 53 14 24 3 31 8 89 -32 - 2 0 7 - 3 46 41 - 1 30 30 - 4 16 47 - 57 0 0 - 2 56 0 24 3 29 9 89 -33 - 2 2 53 - 3 49 28 - 1 33 16 - 4 19 33 - 56 0 0 - 2 59 8 24 3 26 10 89 -34 - 2 6 0 - 3 52 37 - 1 36 23 - 4 22 42 - 55 0 0 - 3 2 38 24 3 22 11 89 -35 - 2 9 29 - 3 56 7 - 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-7 -38 39 53 -40 28 15 -38 9 47 -40 58 52 93 0 0 -39 42 5 23 35 13 21 289 -7 -38 48 8 -40 36 23 -38 18 4 -41 6 58 94 0 0 -39 50 0 23 35 8 20 288 -6 -38 56 6 -40 44 15 -38 26 4 -41 14 48 95 0 0 -39 57 40 23 35 3 19 288 -5 -39 3 49 -40 51 52 -38 33 48 -41 22 22 96 0 0 -40 5 3 23 34 59 18 287 -4 -39 11 16 -40 59 12 -38 41 17 -41 29 41 97 0 0 -40 12 11 23 34 54 18 286 -4 -39 18 26 -41 6 16 -38 48 29 -41 36 44 98 0 0 -40 19 2 23 34 50 17 286 -3 -39 25 21 -41 13 5 -38 55 25 -41 43 30 99 0 0 -40 25 38 23 34 46 16 285 -2 -39 31 59 -41 19 37 -39 2 5 -41 50 1 100 0 0 -40 31 57 23 34 43 15 284 -1 -39 38 21 -41 25 54 -39 8 28 -41 56 16 101 0 0 -40 38 0 23 34 39 15 284 -1 -39 44 27 -41 31 54 -39 14 36 -42 2 14 102 0 0 -40 43 47 23 34 36 14 283 0 -39 50 16 -41 37 38 -39 20 27 -42 7 57 Uncertainty in time = +/- 8 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: UCAC2 32045222 * constellation : Virgo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 14 27 31.8573 DE: +00 31 28.825 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .055, .055 ) * V mag [mag]: 11.8 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (14) Irene approx. diameter [km]: 182 approx. diameter ["]: .205 distance from Earth [AU]: 1.22600 * orbital information: orbit source: Preston date of fit: 2008 Mar 19 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1544 number of rejected observations: 186 time covered by the observations: 1907 Nov 30 - 2008 Feb 11 1 sigma uncertainty ellipse (major, minor, PA): 0.024, 0.013, 118° remarks: * orbital elements for (14) Irene : Mean anomaly = 15.65124530 deg Arg. of pericenter = 96.30664405 deg Long. of node = 86.45317362 deg Inclination = 9.10692264 deg Eccentricity = 0.16747608 Semimajor axis = 2.58524039 AU Perihelion dist = 2.15227447 AU Mag: H = 6.32, G = 0.15 Epoch of elements : MJD 54924.99200000 TDT (2009 Apr 03.992) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Apr 3 14 Irene 23h 48.9m UT 11.8 14 27 31.857 0 31 28.83UCAC2 32045222 0.0 9.1 182 27.4 1.226 -1.694 8.92 27.2251 0.521 -176.44 5.66 23.8147 -0.12458 -0.35482 -3.53842 1.24411 -0.00215 -0.00059 2000 14.4675842009 330.00000 96.306644 86.453174 9.1069230.16747608 2.5852404 2.1522745 6.3 5.00.15 RATE 2.3711160 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.060 0.057 94 1.28 0.057 0 54545.5020090403_045222 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 06:45 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org