IOTA/IOTA-ES occultation update for (1146) Biarmia / UCAC2 31024855 event on 2009 Aug 07, 07:01 UT Visible from Summary ------- On 2009 Aug 07 UT, the 31 km diameter asteroid (1146) Biarmia will occult a 11.7 mag star in the constellation Ophiuchus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.3 mag to 13.9 mag (the magnitude of the asteroid) for at most 3.6 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: 45 * date and approx. time of event: 2009 Aug 07, 06:56 - 2009 Aug 07, 07:10 UT * magnitude of target star: 11.7 * magnitude drop [mag]: 2.3 * estimated maximum duration [s]: 3.6 * Moon: 98 % sunlit, 81° distance * Sun: 111° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 35 * 1 sigma uncertainty interval [path widths]: +/- 1.45 * 1 sigma uncertainty interval [seconds]: +/- 6.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .045 +/- .032) * 1 sigma uncertainty ellipse (major, minor, PA): ( .045", .032", 84° ) * approx speed of asteroid's shadow [km/s]: 8.6577 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 31024855 by 1146 Biarmia on 2009 Aug 7 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 162 0 0 -19 6 59 6 56 54 59 60 -1 -19 17 52 -18 56 8 -19 49 31 -18 24 46 163 0 0 -19 39 20 6 57 8 60 58 -2 -19 50 14 -19 28 27 -20 21 57 -18 57 1 164 0 0 -20 11 52 6 57 23 60 56 -3 -20 22 48 -20 0 58 -20 54 35 -19 29 28 165 0 0 -20 44 36 6 57 37 61 54 -4 -20 55 32 -20 33 40 -21 27 23 -20 2 6 166 0 0 -21 17 28 6 57 51 61 52 -5 -21 28 26 -21 6 32 -22 0 21 -20 34 55 167 0 0 -21 50 30 6 58 5 62 49 -6 -22 1 28 -21 39 32 -22 33 26 -21 7 51 168 0 0 -22 23 38 6 58 20 62 47 -7 -22 34 38 -22 12 39 -23 6 39 -21 40 56 169 0 0 -22 56 52 6 58 34 62 45 -8 -23 7 53 -22 45 53 -23 39 57 -22 14 6 170 0 0 -23 30 12 6 58 48 62 42 -9 -23 41 13 -23 19 11 -24 13 20 -22 47 22 171 0 0 -24 3 34 6 59 3 63 40 -10 -24 14 37 -23 52 33 -24 46 45 -23 20 41 172 0 0 -24 36 59 6 59 17 63 37 -11 -24 48 2 -24 25 57 -25 20 13 -23 54 3 173 0 0 -25 10 25 6 59 31 63 34 -13 -25 21 29 -24 59 22 -25 53 42 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54 33 -48 34 29 -49 23 47 -48 5 29 -132 0 0 -48 59 45 7 8 50 31 308 -51 -49 9 46 -48 49 45 -49 38 55 -48 20 50 -131 0 0 -49 14 36 7 8 55 30 307 -51 -49 24 35 -49 4 37 -49 53 38 -48 35 47 -130 0 0 -49 29 2 7 9 0 30 306 -52 -49 38 59 -49 19 5 -50 7 58 -48 50 19 -129 0 0 -49 43 3 7 9 5 29 305 -52 -49 52 59 -49 33 8 -50 21 53 -49 4 27 -128 0 0 -49 56 41 7 9 10 28 305 -52 -50 6 35 -49 46 47 -50 35 25 -49 18 11 -127 0 0 -50 9 55 7 9 14 28 304 -52 -50 19 48 -50 0 2 -50 48 32 -49 31 30 -126 0 0 -50 22 45 7 9 19 27 303 -52 -50 32 36 -50 12 54 -51 1 17 -49 44 26 -125 0 0 -50 35 11 7 9 23 26 302 -53 -50 45 1 -50 25 22 -51 13 37 -49 56 59 -124 0 0 -50 47 15 7 9 27 26 301 -53 -50 57 3 -50 37 27 -51 25 35 -50 9 8 -123 0 0 -50 58 55 7 9 32 25 300 -53 -51 8 42 -50 49 9 -51 37 10 -50 20 54 -122 0 0 -51 10 13 7 9 36 24 299 -53 -51 19 58 -51 0 28 -51 48 22 -50 32 16 -121 0 0 -51 21 7 7 9 39 24 298 -53 -51 30 52 -51 11 24 -51 59 12 -50 43 16 -120 0 0 -51 31 40 7 9 43 23 298 -53 -51 41 23 -51 21 58 -52 9 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Uncertainty in time = +/- 6 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: UCAC2 31024855 * constellation : Ophiuchus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 16 34 16.6122 DE: -02 08 48.341 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .024, .022 ) * V mag [mag]: 11.7 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1146) Biarmia approx. diameter [km]: 31 approx. diameter ["]: .025 distance from Earth [AU]: 1.71800 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 837 number of rejected observations: 44 time covered by the observations: 1929 May 07 - 2008 Feb 09 1 sigma uncertainty ellipse (major, minor, PA): 0.038, 0.023, 82° remarks: * orbital elements for (1146) Biarmia : Mean anomaly = 357.08149650 deg Arg. of pericenter = 64.44613595 deg Long. of node = 213.97560750 deg Inclination = 17.03187103 deg Eccentricity = 0.25085412 Semimajor axis = 3.05128565 AU Perihelion dist = 2.28585806 AU Mag: H = 9.85, G = 0.15 Epoch of elements : MJD 55050.29200000 TDT (2009 Aug 07.292) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Aug 7 1146 Biarmia 6h 59.9m UT 11.7 16 34 16.612- 2 8 48.34UCAC2 31024855 0.0 13.9 31 3.6 1.718 1.489 -11.31 -172.3462 -2.144 76.47 16.36 6.9984 -0.20458 -0.40357 4.35863 -2.20944 0.00475 -0.00143 2000 357.0275002009 8 7.00000 64.446136213.975607 17.0318710.25085412 3.0512857 2.2858581 9.8 5.00.15 RATE 1.8491820 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.045 0.032 84 2.45 0.036 0 54545.5020090807_024855 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 11:49 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org