IOTA/IOTA-ES occultation update for (327) Columbia / HIP 111364 event on 2009 Oct 01, 05:42 UT Visible from Summary ------- On 2009 Oct 01 UT, the 26 km diameter asteroid (327) Columbia will occult a 8.6 mag star in the constellation Aquarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.5 mag to 14.1 mag (the magnitude of the asteroid) for at most 3.7 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: 50 * date and approx. time of event: 2009 Oct 01, 05:29 - 2009 Oct 01, 05:54 UT * magnitude of target star: 8.6 * magnitude drop [mag]: 5.5 * estimated maximum duration [s]: 3.7 * Moon: 91 % sunlit, 5° distance * Sun: 148° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 30 * 1 sigma uncertainty interval [path widths]: +/- 1.29 * 1 sigma uncertainty interval [seconds]: +/- 6.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .039 +/- .027) * 1 sigma uncertainty ellipse (major, minor, PA): ( .041", .025", 69° ) * approx speed of asteroid's shadow [km/s]: 7.0951 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 111364 by 327 Columbia on 2009 Oct 1 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 178 0 0 25 41 51 5 54 33 20 113 -1 25 50 12 25 33 31 26 11 46 25 12 6 179 0 0 25 31 55 5 54 28 21 113 -2 25 40 15 25 23 35 26 1 49 25 2 10 180 0 0 25 22 4 5 54 22 22 114 -2 25 30 24 25 13 45 25 51 58 24 52 20 -179 0 0 25 12 20 5 54 16 23 114 -3 25 20 39 25 4 1 25 42 12 24 42 36 -178 0 0 25 2 41 5 54 9 23 115 -4 25 11 1 24 54 22 25 32 33 24 32 59 -177 0 0 24 53 9 5 54 3 24 115 -5 25 1 28 24 44 50 25 23 0 24 23 27 -176 0 0 24 43 43 5 53 56 25 116 -6 24 52 2 24 35 24 25 13 33 24 14 2 -175 0 0 24 34 23 5 53 49 26 116 -7 24 42 42 24 26 5 25 4 13 24 4 43 -174 0 0 24 25 11 5 53 42 27 117 -8 24 33 29 24 16 53 24 54 59 23 55 32 -173 0 0 24 16 5 5 53 34 28 117 -9 24 24 24 24 7 47 24 45 53 23 46 27 -172 0 0 24 7 6 5 53 27 29 118 -9 24 15 25 23 58 49 24 36 53 23 37 29 -171 0 0 23 58 15 5 53 19 29 118 -10 24 6 33 23 49 58 24 28 1 23 28 38 -170 0 0 23 49 31 5 53 11 30 119 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54 - 43 0 0 27 29 29 5 30 4 12 252 -43 27 37 52 27 21 8 27 59 31 26 59 37 - 42 0 0 27 40 16 5 30 1 11 252 -42 27 48 39 27 31 55 28 10 19 27 10 24 - 41 0 0 27 51 7 5 29 58 10 253 -41 27 59 29 27 42 45 28 21 9 27 21 13 - 40 0 0 28 2 0 5 29 56 9 253 -41 28 10 23 27 53 38 28 32 3 27 32 6 - 39 0 0 28 12 56 5 29 53 8 254 -40 28 21 19 28 4 34 28 43 0 27 43 2 - 38 0 0 28 23 55 5 29 51 7 254 -39 28 32 18 28 15 33 28 53 59 27 54 1 - 37 0 0 28 34 57 5 29 49 6 255 -38 28 43 20 28 26 34 29 5 1 28 5 1 - 36 0 0 28 46 0 5 29 48 5 255 -37 28 54 23 28 37 38 29 16 5 28 16 5 - 35 0 0 28 57 6 5 29 46 4 255 -36 29 5 29 28 48 43 29 27 11 28 27 10 - 34 0 0 29 8 13 5 29 45 4 256 -35 29 16 36 28 59 50 29 38 18 28 38 17 - 33 0 0 29 19 22 5 29 44 3 256 -34 29 27 45 29 10 59 29 49 27 28 49 25 - 32 0 0 29 30 32 5 29 44 2 257 -33 29 38 55 29 22 9 30 0 38 .. .. .. - 31 0 0 29 41 43 5 29 43 1 257 -33 29 50 6 29 33 20 30 11 49 .. .. .. Uncertainty in time = +/- 7 secs [Prediction of 2008 Nov 16.0] Data for the target star ------------------------ * name: HIP 111364 * constellation : Aquarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 22 33 41.1067 DE: -10 31 15.810 * position source: mpos:HIP2 pm:HIP2 plx:HIP2 * standard error: RA,DE ["]: ( .022, .017 ) * V mag [mag]: 8.6 * B mag [mag]: 9.6 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (327) Columbia approx. diameter [km]: 26 approx. diameter ["]: .021 distance from Earth [AU]: 1.74100 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 793 number of rejected observations: 119 time covered by the observations: 1903 Oct 19 - 2008 Feb 10 1 sigma uncertainty ellipse (major, minor, PA): 0.035, 0.018, 61° remarks: * orbital elements for (327) Columbia : Mean anomaly = 39.57577000 deg Arg. of pericenter = 308.22490288 deg Long. of node = 354.83097118 deg Inclination = 7.15048445 deg Eccentricity = 0.06437715 Semimajor axis = 2.77689789 AU Perihelion dist = 2.59812911 AU Mag: H = 9.85, G = 0.15 Epoch of elements : MJD 55105.23800000 TDT (2009 Oct 01.238) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Oct 1 327 Columbia 5h 42.7m UT 8.6 22 33 41.107-10 31 15.81HIP 111364 9.6 14.1 26 3.7 1.741 -1.370 -0.02 -117.3423 -10.520 91.76 -3.25 5.7111 -0.00135 0.50231 -4.00464 -0.00589 0.00275 0.00122 2000 38.4601162009 926.00000308.224903354.830971 7.1504840.06437715 2.7768979 2.598129110.1 5.00.15 RATE 2.1299240 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.041 0.025 69 2.29 0.027 0 54786.5020091001_111364 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 16, 18:08 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org