IOTA/IOTA-ES occultation update for (394) Arduina / TYC 6854-02697-1 event on 2008 Jul 02, 07:24 UT Visible from Brazil, Bolivia, Peru Summary ------- On 2008 Jul 02 UT, the 31 km diameter asteroid (394) Arduina will occult a 11.5 mag star in the constellation Sagittarius for observers along a path across Brazil, Bolivia, Peru. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.4 mag to 12.6 mag (the magnitude of the asteroid) for at most 3.5 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: 49 * date and approx. time of event: 2008 Jul 02, 07:12 - 2008 Jul 02, 07:35 UT * midpoint of event [JD]: 2454649.80868333 * magnitude of target star: 11.5 * magnitude drop [mag]: 1.4 * estimated maximum duration [s]: 3.5 * Moon: 1 % sunlit, 178° distance * Sun: 169° distance * rough path description: Brazil, Bolivia, Peru The occultation path -------------------- * approximate projected width [km]: 31 * 1 sigma uncertainty interval [path widths]: +/- 1.31 * 1 sigma uncertainty interval [seconds]: +/- 5.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .058 +/- .040) * 1 sigma uncertainty ellipse (major, minor, PA): ( .058", .040", 92° ) * approx speed of asteroid's shadow [km/s]: 9.0627 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6854-02697-1 by 394 Arduina on 2008 Jul 2 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 148 0 0 -22 24 25 7 35 52 12 116 -1 -22 14 55 -22 33 56 -21 50 1 -22 58 51 149 0 0 -22 53 1 7 35 49 13 116 -2 -22 43 32 -23 2 30 -22 18 42 -23 27 22 150 0 0 -23 21 10 7 35 46 14 115 -3 -23 11 43 -23 30 38 -22 46 57 -23 55 27 151 0 0 -23 48 54 7 35 43 15 115 -4 -23 39 28 -23 58 20 -23 14 45 -24 23 5 152 0 0 -24 16 11 7 35 40 16 114 -5 -24 6 47 -24 25 36 -23 42 8 -24 50 17 153 0 0 -24 43 2 7 35 36 17 114 -6 -24 33 39 -24 52 26 -24 9 4 -25 17 3 154 0 0 -25 9 26 7 35 32 18 114 -7 -25 0 4 -25 18 48 -24 35 33 -25 43 22 155 0 0 -25 35 23 7 35 28 19 113 -8 -25 26 3 -25 44 44 -25 1 35 -26 9 14 156 0 0 -26 0 53 7 35 24 20 113 -9 -25 51 34 -26 10 12 -25 27 10 -26 34 38 157 0 0 -26 25 55 7 35 20 21 112 -10 -26 16 38 -26 35 13 -25 52 18 -26 59 35 158 0 0 -26 50 30 7 35 15 22 112 -11 -26 41 14 -26 59 47 -26 16 58 -27 24 5 159 0 0 -27 14 38 7 35 11 23 111 -12 -27 5 23 -27 23 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13 241 -24 - 2 39 25 - 2 58 56 - 2 13 52 - 3 24 32 - 41 0 0 - 2 14 26 7 13 8 12 241 -23 - 2 4 41 - 2 24 12 - 1 39 10 - 2 49 46 - 40 0 0 - 1 39 48 7 13 5 11 241 -22 - 1 30 3 - 1 49 33 - 1 4 33 - 2 15 6 - 39 0 0 - 1 5 16 7 13 2 10 241 -20 - 0 55 32 - 1 15 0 - 0 30 3 - 1 40 32 - 38 0 0 - 0 30 52 7 13 0 9 241 -19 - 0 21 9 - 0 40 36 0 4 19 - 1 6 6 - 37 0 0 0 3 23 7 12 58 8 241 -18 0 13 6 - 0 6 20 0 38 32 - 0 31 48 - 36 0 0 0 37 28 7 12 56 6 241 -17 0 47 10 0 27 46 1 12 34 0 2 20 - 35 0 0 1 11 23 7 12 55 5 241 -16 1 21 4 1 1 41 1 46 26 0 36 17 - 34 0 0 1 45 6 7 12 54 4 241 -15 1 54 46 1 35 25 2 20 6 1 10 3 - 33 0 0 2 18 36 7 12 53 3 241 -14 2 28 16 2 8 56 2 53 33 1 43 36 - 32 0 0 2 51 52 7 12 52 2 241 -12 3 1 31 2 42 13 3 26 46 2 16 56 - 31 0 0 3 24 54 7 12 52 1 241 -11 3 34 32 3 15 16 3 59 45 2 50 1 Uncertainty in time = +/- 6 secs [Prediction of 2008 May 26.0] Data for the target star ------------------------ * name: TYC 6854-02697-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 01 38.1332 DE: -28 26 42.786 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .046, .035 ) * V mag [mag]: 11.5 * B mag [mag]: 11.6 * Apparent position with proper motion RA(deg): 270.5532455800 DE(deg): -28.4466695559 * Equation of equinoxes (radians) : 0.000049887517912 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (394) Arduina approx. diameter [km]: 31 approx. diameter ["]: .031 distance from Earth [AU]: 1.35700 * orbital information: orbit source: Preston date of fit: 2008 May 22 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 868 number of rejected observations: 84 time covered by the observations: 1902 Apr 29 - 2008 May 11 1 sigma uncertainty ellipse (major, minor, PA): 0.035, 0.019, 96° remarks: * orbital elements for (394) Arduina : Mean anomaly = 319.39174509 deg Arg. of pericenter = 269.40998364 deg Long. of node = 67.36888291 deg Inclination = 6.22178800 deg Eccentricity = 0.22900547 Semimajor axis = 2.76245670 AU Perihelion dist = 2.12983901 AU Mag: H = 9.67, G = 0.15 Epoch of elements : MJD 54649.30900000 TDT (2008 Jul 02.309) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jul 2 394 Arduina 7h 24.5m UT 11.5 18 1 38.133-28 26 42.79TYC 6854-02697-1 11.6 12.6 31 3.5 1.357 -2.462 -6.60 -121.4263 -28.444 69.90 23.00 7.4084 0.02490 -0.12376 -5.01270 -1.01895 0.00096 0.00046 2000 317.3934302008 623.00000269.409984 67.368883 6.2217880.22900547 2.7624567 2.1298390 9.7 5.00.15 RATE 2.1466480 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.058 0.040 92 2.31 0.041 0 54612.5020080702_2697-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 May 26, 14:33 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org