IOTA/IOTA-ES occultation update for (132) Aethra / TYC 7353-01047-1 event on 2008 Feb 01, 08:38 UT Visible from Argentina, Chile Summary ------- On 2008 Feb 01 UT, the 43 km diameter asteroid (132) Aethra will occult a 10.3 mag star in the constellation Scorpius for observers along a path across Argentina, Chile. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.5 mag to 13.8 mag (the magnitude of the asteroid) for at most 1.4 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: 53 * date and approx. time of event: 2008 Feb 01, 08:35 - 2008 Feb 01, 08:41 UT * midpoint of event [JD]: 2454497.86002083 * magnitude of target star: 10.3 * magnitude drop [mag]: 3.5 * estimated maximum duration [s]: 1.4 * Moon: 30 % sunlit, 11° distance * Sun: 60° distance * rough path description: Argentina, Chile The occultation path -------------------- * approximate projected width [km]: 44 * 1 sigma uncertainty interval [path widths]: +/- 1.19 * 1 sigma uncertainty interval [seconds]: +/- 1.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .039 +/- .031) * 1 sigma uncertainty ellipse (major, minor, PA): ( .039", .031", 79° ) * approx speed of asteroid's shadow [km/s]: 30.9632 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7353-01047-1 by 132 Aethra on 2008 Feb 01 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 -106 0 0 - 8 37 44 8 35 3 0 125 -58 - 8 52 15 .. .. .. - 9 26 51 .. .. .. -105 0 0 - 9 19 23 8 35 3 1 125 -57 - 9 33 55 - 9 4 52 -10 8 33 .. .. .. -104 0 0 -10 1 4 8 35 4 2 125 -56 -10 15 36 - 9 46 33 -10 50 16 - 9 12 2 -103 0 0 -10 42 46 8 35 4 4 124 -54 -10 57 19 -10 28 14 -11 32 1 - 9 53 42 -102 0 0 -11 24 28 8 35 4 5 124 -53 -11 39 1 -11 9 55 -12 13 44 -10 35 22 -101 0 0 -12 6 7 8 35 5 6 124 -52 -12 20 41 -11 51 34 -12 55 25 -11 17 0 -100 0 0 -12 47 43 8 35 5 7 124 -51 -13 2 17 -12 33 10 -13 37 2 -11 58 35 - 99 0 0 -13 29 14 8 35 6 8 124 -50 -13 43 48 -13 14 41 -14 18 33 -12 40 6 - 98 0 0 -14 10 38 8 35 6 10 123 -49 -14 25 13 -13 56 5 -14 59 57 -13 21 30 - 97 0 0 -14 51 55 8 35 7 11 123 -47 -15 6 29 -14 37 21 -15 41 12 -14 2 47 - 96 0 0 -15 33 1 8 35 8 12 123 -46 -15 47 35 -15 18 28 -16 22 18 -14 43 55 - 95 0 0 -16 13 57 8 35 9 13 122 -45 -16 28 30 -15 59 24 -17 3 12 -15 24 52 - 94 0 0 -16 54 40 8 35 10 14 122 -44 -17 9 12 -16 40 8 -17 43 53 -16 5 37 - 93 0 0 -17 35 9 8 35 11 16 122 -43 -17 49 41 -17 20 38 -18 24 20 -16 46 8 - 92 0 0 -18 15 23 8 35 12 17 122 -42 -18 29 54 -18 0 53 -19 4 31 -17 26 25 - 91 0 0 -18 55 20 8 35 13 18 121 -41 -19 9 50 -18 40 51 -19 44 25 -18 6 26 - 90 0 0 -19 35 0 8 35 15 19 121 -39 -19 49 29 -19 20 32 -20 24 0 -18 46 9 - 89 0 0 -20 14 20 8 35 16 20 120 -38 -20 28 48 -19 59 53 -21 3 17 -19 25 34 - 88 0 0 -20 53 20 8 35 18 21 120 -37 -21 7 47 -20 38 55 -21 42 12 -20 4 38 - 87 0 0 -21 31 59 8 35 19 22 120 -36 -21 46 24 -21 17 35 -22 20 46 -20 43 22 - 86 0 0 -22 10 15 8 35 21 24 119 -35 -22 24 38 -21 55 53 -22 58 56 -21 21 43 - 85 0 0 -22 48 8 8 35 23 25 119 -34 -23 2 29 -22 33 47 -23 36 43 -21 59 42 - 84 0 0 -23 25 35 8 35 24 26 118 -33 -23 39 55 -23 11 16 -24 14 5 -22 37 16 - 83 0 0 -24 2 38 8 35 26 27 118 -32 -24 16 55 -23 48 21 -24 51 0 -23 14 24 - 82 0 0 -24 39 13 8 35 28 28 117 -30 -24 53 29 -24 24 58 -25 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11 -11 44 4 -12 47 54 -11 9 31 82 0 0 -11 16 58 8 41 48 3 236 61 -11 31 31 -11 2 26 -12 6 14 -10 27 53 83 0 0 -10 35 18 8 41 48 2 235 60 -10 49 50 -10 20 46 -11 24 31 .. .. .. 84 0 0 - 9 53 37 8 41 48 1 235 59 -10 8 9 - 9 39 5 -10 42 48 .. .. .. 85 0 0 .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. -10 1 6 .. .. .. Data for the target star ------------------------ * name: TYC 7353-01047-1 * constellation : Scorpius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 16 37 44.0617 DE: -34 24 15.251 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .030, .030 ) * V mag [mag]: 10.3 * B mag [mag]: 11.5 * Apparent position with proper motion RA(deg): 249.5653520661 DE(deg): -34.4209248072 * Equation of equinoxes (radians) : 0.000044374354796 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (132) Aethra approx. diameter [km]: 43 approx. diameter ["]: .026 distance from Earth [AU]: 2.26400 * orbital information: orbit source: Preston date of fit: 2007 Dec 19 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 865 number of rejected observations: 52 time covered by the observations: 1932 Jun 21 - 2007 Mar 05 1 sigma uncertainty ellipse (major, minor, PA): 0.026, 0.008, 64° remarks: * orbital elements for (132) Aethra : Mean anomaly = 33.18709430 deg Arg. of pericenter = 254.37993158 deg Long. of node = 258.91471572 deg Inclination = 25.05175721 deg Eccentricity = 0.38794188 Semimajor axis = 2.60912689 AU Perihelion dist = 1.59693730 AU Mag: H = 8.91, G = 0.15 Epoch of elements : MJD 54497.36000000 TDT (2008 Feb 01.360) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Feb 01 132 Aethra 8h 38.4m UT 10.3 16 37 44.062-34 24 15.25TYC 7353-01047-1 11.5 13.8 43 1.4 2.264 5.484 -0.59 -11.114 -34.404 53.77 -17.23 8.6405 -.00061 -.18870 17.47583 -0.15385 -0.00468 0.00008 2000 31.46586322008 125.00000254.379932258.914716 25.0517570.387941882.609126891.596937309.385 0.15 RATE 2.3386287 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.039 0.031 78.9 2.190 0.031 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Dec 22, 20:15 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org