IOTA/IOTA-ES occultation update for (229) Adelinda / TYC 6178-00484-1 event on 2007 Aug 01, 16:20 UT Visible from Madagascar, Africa Summary ------- On 2007 Aug 01 UT, the 93 km diameter asteroid (229) Adelinda will occult a 11.8 mag star in the constellation Libra for observers along a path across Madagascar, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.3 mag to 15.0 mag (the magnitude of the asteroid) for at most 11.1 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: 62 * date and approx. time of event: 2007 Aug 01, 16:06 - 2007 Aug 01, 16:32 UT * magnitude of target star: 11.8 * magnitude drop [mag]: 3.3 * estimated maximum duration [s]: 11.1 * Moon: 91 % sunlit, 111° distance * Sun: 103° distance * rough path description: Madagascar, Africa The occultation path -------------------- * approximate projected width [km]: 93 * 1 sigma uncertainty interval [path widths]: +/- 0.98 * 1 sigma uncertainty interval [seconds]: +/- 8.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .036 +/- .043) * 1 sigma uncertainty ellipse (major, minor, PA): ( .043", .036", 2° ) * approx speed of asteroid's shadow [km/s]: 8.3974 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6178-00484-1 by 229 Adelinda on 2007 Aug 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 - 47 0 0 13 17 4 16 6 41 0 110 76 12 50 9 13 43 59 11 57 22 .. .. .. - 46 0 0 12 55 0 16 6 41 1 111 75 12 28 2 13 21 57 11 35 10 14 14 47 - 45 0 0 12 32 37 16 6 42 2 111 74 12 5 37 12 59 37 11 12 40 13 52 32 - 44 0 0 12 9 56 16 6 42 4 111 73 11 42 53 12 36 59 10 49 52 13 29 58 - 43 0 0 11 46 57 16 6 43 5 111 72 11 19 52 12 14 2 10 26 45 13 7 7 - 42 0 0 11 23 41 16 6 45 6 112 71 10 56 33 11 50 48 10 3 22 12 43 58 - 41 0 0 11 0 7 16 6 46 7 112 70 10 32 57 11 27 17 9 39 41 12 20 31 - 40 0 0 10 36 17 16 6 48 8 112 69 10 9 4 11 3 29 9 15 44 11 56 48 - 39 0 0 10 12 10 16 6 50 9 112 68 9 44 55 10 39 25 8 51 30 11 32 48 - 38 0 0 9 47 47 16 6 52 10 112 67 9 20 30 10 15 4 8 27 1 11 8 32 - 37 0 0 9 23 9 16 6 55 11 112 66 8 55 50 9 50 28 8 2 16 10 44 1 - 36 0 0 8 58 16 16 6 58 12 113 65 8 30 55 9 25 38 7 37 17 10 19 14 - 35 0 0 8 33 9 16 7 1 13 113 64 8 5 45 9 0 32 7 12 3 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Data for the target star ------------------------ * name: TYC 6178-00484-1 * constellation : Libra * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 15 16 44.8086 DE: -19 45 29.396 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .030, .040 ) * V mag [mag]: 11.8 * B mag [mag]: 12.3 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (229) Adelinda approx. diameter [km]: 93 approx. diameter ["]: .043 distance from Earth [AU]: 2.97800 * orbital information: orbit source: Preston date of fit: 2007 Jul 28 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 841 number of rejected observations: 102 time covered by the observations: 1900 Jun 04 - 2007 Jun 29 1 sigma uncertainty ellipse (major, minor, PA): 0.020, 0.015, 108° remarks: * orbital elements for (229) Adelinda : Mean anomaly = 286.06712615 deg Arg. of pericenter = 311.29435430 deg Long. of node = 28.29437745 deg Inclination = 2.08361655 deg Eccentricity = 0.14418074 Semimajor axis = 3.42441814 AU Perihelion dist = 2.93068299 AU Mag: H = 9.12, G = 0.15 Epoch of elements : MJD 54313.68100000 TDT (2007 Aug 01.681) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Aug 01 229 Adelinda 16h 19.3m UT 11.8 15 16 44.809-19 45 29.40TYC 6178-00484-1 12.3 15.0 93 11.1 2.978 0.964 -3.34 34.460 -19.757 -63.24 17.99 16.3221 .00048 .00717 4.60332 -1.12898 0.00533 -0.00140 2000 285.4946072007 729.00000311.294354 28.294377 2.0836170.144180743.424418142.930682999.135 0.15 RATE 1.5553350 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.043 0.036 2.2 1.980 0.042 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Jul 29, 02:07 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org