IOTA/IOTA-ES occultation update for (397) Vienna / TYC 5560-01171-1 event on 2008 May 22, 01:29 UT Visible from Brazil, Argentina, Bolivia Summary ------- On 2008 May 22 UT, the 43 km diameter asteroid (397) Vienna will occult a 10.0 mag star in the constellation Virgo for observers along a path across Brazil, Argentina, Bolivia. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.0 mag to 14.0 mag (the magnitude of the asteroid) for at most 3.4 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: 67 * date and approx. time of event: 2008 May 22, 01:20 - 2008 May 22, 01:36 UT * midpoint of event [JD]: 2454608.56179167 * magnitude of target star: 10.0 * magnitude drop [mag]: 4.0 * estimated maximum duration [s]: 3.4 * Moon: 97 % sunlit, 48° distance * Sun: 153° distance * rough path description: Brazil, Argentina, Bolivia The occultation path -------------------- * approximate projected width [km]: 44 * 1 sigma uncertainty interval [path widths]: +/- 0.89 * 1 sigma uncertainty interval [seconds]: +/- 3.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .028 +/- .022) * 1 sigma uncertainty ellipse (major, minor, PA): ( .028", .022", 93° ) * approx speed of asteroid's shadow [km/s]: 12.6867 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5560-01171-1 by 397 Vienna on 2008 May 22 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 ' " Longitude Longitude Longitude Longitude Latitude Latitude Latitude Latitude -110 0 0 10 15 24 1 36 4 28 113 -1 10 29 16 10 1 32 10 53 54 9 36 48 -109 0 0 9 40 35 1 35 59 29 113 -2 9 54 31 9 26 39 10 19 15 9 1 48 -108 0 0 9 5 7 1 35 54 30 113 -3 9 19 6 8 51 7 9 43 57 8 26 10 -107 0 0 8 28 59 1 35 49 31 113 -4 8 43 2 8 14 56 9 8 0 7 49 51 -106 0 0 7 52 13 1 35 43 33 113 -5 8 6 19 7 38 5 8 31 23 7 12 54 -105 0 0 7 14 48 1 35 38 34 113 -7 7 28 58 7 0 37 7 54 9 6 35 19 -104 0 0 6 36 46 1 35 32 35 113 -8 6 51 0 6 22 31 7 16 17 5 57 7 -103 0 0 5 58 6 1 35 26 36 113 -9 6 12 24 5 43 48 6 37 48 5 18 17 -102 0 0 5 18 51 1 35 20 37 113 -10 5 33 12 5 4 29 5 58 43 4 38 51 -101 0 0 4 39 0 1 35 13 38 113 -11 4 53 25 4 24 34 5 19 2 3 58 50 -100 0 0 3 58 34 1 35 6 39 113 -12 4 13 3 3 44 5 4 38 46 3 18 14 - 99 0 0 3 17 35 1 34 59 41 112 -13 3 32 7 3 3 2 3 57 56 2 37 5 - 98 0 0 2 36 3 1 34 52 42 112 -15 2 50 38 2 21 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4 6 -51 29 7 -50 41 52 -51 51 25 50 0 0 -51 4 52 1 20 55 6 254 -28 -50 52 19 -51 17 25 -50 30 1 -51 39 48 51 0 0 -50 52 38 1 20 55 5 253 -27 -50 40 3 -51 5 14 -50 17 41 -51 27 42 52 0 0 -50 39 55 1 20 54 4 252 -26 -50 27 17 -50 52 34 -50 4 50 -51 15 6 53 0 0 -50 26 41 1 20 54 4 252 -26 -50 14 0 -50 39 22 -49 51 28 -51 1 59 54 0 0 -50 12 56 1 20 53 3 251 -25 -50 0 13 -50 25 40 -49 37 36 -50 48 23 55 0 0 -49 58 40 1 20 53 2 250 -24 -49 45 54 -50 11 27 -49 23 12 -50 34 15 56 0 0 -49 43 53 1 20 53 2 249 -24 -49 31 3 -49 56 43 -49 8 16 -50 19 35 57 0 0 -49 28 33 1 20 53 1 249 -23 -49 15 40 -49 41 26 -48 52 47 -50 4 24 58 0 0 -49 12 40 1 20 53 0 248 -22 -48 59 45 -49 25 36 -48 36 46 -49 48 40 Uncertainty in time = +/- 3 secs [Prediction of 2008 Apr 13.0] Data for the target star ------------------------ * name: TYC 5560-01171-1 * constellation : Virgo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 14 04 57.0751 DE: -14 36 16.357 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .019 ) * V mag [mag]: 10.0 * B mag [mag]: 11.1 * Apparent position with proper motion RA(deg): 211.3585091203 DE(deg): -14.6480916238 * Equation of equinoxes (radians) : 0.000040611933433 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (397) Vienna approx. diameter [km]: 43 approx. diameter ["]: .027 distance from Earth [AU]: 2.16500 * orbital information: orbit source: Preston date of fit: 2008 Apr 08 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 767 number of rejected observations: 59 time covered by the observations: 1900 Mar 02 - 2008 Apr 01 1 sigma uncertainty ellipse (major, minor, PA): 0.018, 0.012, 97° remarks: * orbital elements for (397) Vienna : Mean anomaly = 233.98328102 deg Arg. of pericenter = 139.29502511 deg Long. of node = 228.26092339 deg Inclination = 12.83600048 deg Eccentricity = 0.24670868 Semimajor axis = 2.63421857 AU Perihelion dist = 1.98433398 AU Mag: H = 9.38, G = 0.15 Epoch of elements : MJD 54608.06200000 TDT (2008 May 22.062) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 22 397 Vienna 1h 29.0m UT 10.0 14 4 57.075-14 36 16.36TYC 5560-01171-1 11.1 14.0 43 3.4 2.165 -1.606 17.36 -51.0611 -14.610 156.92 20.43 1.4830 -0.14940 -0.19964 -5.74347 4.27656 0.00246 -0.00072 2000 232.1247532008 514.00000139.295025228.260923 12.8360000.24670868 2.6342186 1.9843340 9.3 5.00.15 RATE 2.3052940 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.028 0.022 93 1.89 0.024 0 54569.5020080522_1171-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 13, 03:56 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org