IOTA/IOTA-ES occultation update for (6359) Dubinin / TYC 6875-01339-1 event on 2008 May 03, 06:09 UT Visible from Chile, Argentina Summary ------- On 2008 May 03 UT, the 32 km diameter asteroid (6359) Dubinin will occult a 8.8 mag star in the constellation Sagittarius for observers along a path across Chile, Argentina. In the case of an occultation, the combined light of the asteroid and the star will drop by 8.6 mag to 17.4 mag (the magnitude of the asteroid) for at most 7.8 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: 13 * date and approx. time of event: 2008 May 03, 05:50 - 2008 May 03, 06:28 UT * midpoint of event [JD]: 2454589.75632083 * magnitude of target star: 8.8 * magnitude drop [mag]: 8.6 * estimated maximum duration [s]: 7.8 * Moon: 7 % sunlit, 83° distance * Sun: 114° distance * rough path description: Chile, Argentina The occultation path -------------------- * approximate projected width [km]: 43 * 1 sigma uncertainty interval [path widths]: +/- 5.25 * 1 sigma uncertainty interval [seconds]: +/- 45.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .104 +/- .056) * 1 sigma uncertainty ellipse (major, minor, PA): ( .104", .056", 93° ) * approx speed of asteroid's shadow [km/s]: 4.0511 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6875-01339-1 by 6359 Dubinin on 2008 May 3 Centre Star Star Sun Path Limit1 Path Limit2 Error Limit1 Error Limit2 E. Longitude Latitude U.T. Alt Az Alt o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " o ' " o ' " o ' " o ' " Longitude Latitude Longitude Latitude Longitude Latitude Longitude Latitude -100 15 55 - 2 5 32 5 50 2 8 113 -72 - 99 37 35 - 2 14 54 -100 57 22 - 1 54 50 - 94 30 46 - 3 11 33 ... .. .. .. .. .. - 96 41 47 - 4 26 39 5 50 32 13 113 -76 - 96 14 41 - 4 31 6 - 97 9 49 - 4 21 46 - 92 9 26 - 5 0 37 -104 1 50 - 2 39 38 - 94 10 45 - 6 20 12 5 51 1 16 112 -79 - 93 48 2 - 6 22 43 - 94 33 59 - 6 17 28 - 90 13 11 - 6 38 31 - 99 22 8 - 5 29 15 - 92 9 31 - 8 0 35 5 51 30 18 112 -81 - 91 49 14 - 8 1 59 - 92 30 8 - 7 59 2 - 88 33 8 - 8 9 6 - 96 32 55 - 7 31 3 - 90 26 33 - 9 32 48 5 52 0 21 111 -83 - 90 7 51 - 9 33 27 - 90 45 29 - 9 32 2 - 87 4 35 - 9 34 26 - 94 22 52 - 9 15 39 - 88 56 14 -10 59 18 5 52 29 23 110 -85 - 88 38 40 -10 59 25 - 89 14 0 -10 59 6 - 85 44 46 -10 55 45 - 92 34 49 -10 50 32 - 87 35 20 -12 21 32 5 52 58 24 110 -86 - 87 18 35 -12 21 13 - 87 52 14 -12 21 45 - 84 31 49 -12 13 53 - 91 1 20 -12 18 54 - 86 21 46 -13 40 24 5 53 28 26 109 -86 - 86 5 40 -13 39 46 - 86 38 1 -13 40 59 - 83 24 27 -13 29 25 - 89 38 24 -13 42 32 - 85 14 7 -14 56 34 5 53 57 28 108 -86 - 84 58 32 -14 55 39 - 85 29 51 -14 57 25 - 82 21 45 -14 42 47 - 88 23 32 -15 2 32 - 84 11 23 -16 10 29 5 54 26 29 108 -85 - 83 56 11 -16 9 19 - 84 26 41 -16 11 35 - 81 22 59 -15 54 17 - 87 15 5 -16 19 38 - 83 12 45 -17 22 29 5 54 56 30 107 -84 - 82 57 53 -17 21 8 - 83 27 44 -17 23 48 - 80 27 36 -17 4 12 - 86 11 55 -17 34 22 - 82 17 41 -18 32 53 5 55 25 32 106 -82 - 82 3 4 -18 31 21 - 82 32 23 -18 34 22 - 79 35 9 -18 12 44 - 85 13 9 -18 47 6 - 81 25 40 -19 41 52 5 55 54 33 105 -81 - 81 11 16 -19 40 10 - 81 40 9 -19 43 31 - 78 45 18 -19 20 4 - 84 18 10 -19 58 9 - 80 36 21 -20 49 38 5 56 24 34 104 -80 - 80 22 8 -20 47 48 - 80 50 39 -20 51 26 - 77 57 43 -20 26 19 - 83 26 26 -21 7 46 - 79 49 24 -21 56 19 5 56 53 35 103 -79 - 79 35 20 -21 54 21 - 80 3 34 -21 58 15 - 77 12 11 -21 31 37 - 82 37 33 -22 16 7 - 79 4 36 -23 2 4 5 57 22 36 102 -77 - 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Uncertainty in time = +/- 55 secs [Prediction of 2008 Feb 17.0] Data for the target star ------------------------ * name: TYC 6875-01339-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 19 21 56.6665 DE: -22 58 46.146 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .022, .027 ) * V mag [mag]: 8.8 * B mag [mag]: 10.0 * Apparent position with proper motion RA(deg): 290.6166173173 DE(deg): -22.9644322880 * Equation of equinoxes (radians) : 0.000038166982367 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (6359) Dubinin approx. diameter [km]: 32 approx. diameter ["]: .015 distance from Earth [AU]: 2.95900 * orbital information: orbit source: Preston date of fit: 2008 Feb 16 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 475 number of rejected observations: 6 time covered by the observations: 1966 Feb 20 - 2007 May 19 1 sigma uncertainty ellipse (major, minor, PA): 0.102, 0.049, 93° remarks: * orbital elements for (6359) Dubinin : Mean anomaly = 147.32231144 deg Arg. of pericenter = 31.14368598 deg Long. of node = 89.69614975 deg Inclination = 10.78318762 deg Eccentricity = 0.09752594 Semimajor axis = 3.22302334 AU Perihelion dist = 2.90869496 AU Mag: H = 11.39, G = 0.15 Epoch of elements : MJD 54589.25700000 TDT (2008 May 03.257) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 3 6359 Dubinin 6h 9.1m UT 8.8 19 21 56.667-22 58 46.15TYC 6875-01339-1 10.0 17.4 32 7.8 2.959 0.353 -4.72 -23.3078 -22.979 86.94 15.80 6.1517 -0.46601 -0.48251 1.64552 -1.58764 -0.00526 -0.00071 2000 145.7455022008 424.00000 31.143686 89.696150 10.7831880.09752594 3.2230233 2.908695011.5 5.00.15 RATE 1.7033690 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.104 0.056 93 6.25 0.078 0 54513.5020080503_1339-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 31, 03:44 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org