IOTA/IOTA-ES occultation update for (139) Juewa / TYC 7396-00123-1 event on 2007 Nov 04, 12:38 UT Visible from Indonesia Summary ------- On 2007 Nov 04 UT, the 157 km diameter asteroid (139) Juewa will occult a 11.3 mag star in the constellation Sagittarius for observers along a path across Indonesia. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.5 mag to 13.7 mag (the magnitude of the asteroid) for at most 4.4 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: 98 * date and approx. time of event: 2007 Nov 04, 12:35 - 2007 Nov 04, 12:41 UT * magnitude of target star: 11.3 * magnitude drop [mag]: 2.5 * estimated maximum duration [s]: 4.4 * Moon: 25 % sunlit, 110° distance * Sun: 52° distance * rough path description: Indonesia The occultation path -------------------- * approximate projected width [km]: 157 * 1 sigma uncertainty interval [path widths]: +/- 0.37 * 1 sigma uncertainty interval [seconds]: +/- 1.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .025 +/- .024) * 1 sigma uncertainty ellipse (major, minor, PA): ( .025", .024", 89° ) * approx speed of asteroid's shadow [km/s]: 36.0409 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7396-00123-1 by 139 Juewa on 2007 Nov 04 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 - 51 0 0 .. .. .. .. .. .. .. .. .. - 3 34 14 .. .. .. - 4 11 35 .. .. .. - 50 0 0 - 3 21 55 12 35 27 1 122 52 - 4 12 22 - 2 31 25 - 4 49 40 - 1 54 0 - 49 0 0 - 3 59 54 12 35 27 2 122 53 - 4 50 17 - 3 9 29 - 5 27 31 - 2 32 7 - 48 0 0 - 4 37 40 12 35 27 3 122 54 - 5 27 57 - 3 47 19 - 6 5 9 - 3 10 1 - 47 0 0 - 5 15 10 12 35 27 4 122 55 - 6 5 22 - 4 24 54 - 6 42 30 - 3 47 41 - 46 0 0 - 5 52 24 12 35 28 5 122 56 - 6 42 31 - 5 2 14 - 7 19 34 - 4 25 4 - 45 0 0 - 6 29 21 12 35 28 7 122 57 - 7 19 22 - 5 39 16 - 7 56 21 - 5 2 11 - 44 0 0 - 7 5 59 12 35 29 8 122 58 - 7 55 54 - 6 16 1 - 8 32 49 - 5 39 0 - 43 0 0 - 7 42 18 12 35 29 9 122 60 - 8 32 6 - 6 52 26 - 9 8 57 - 6 15 29 - 42 0 0 - 8 18 16 12 35 30 10 122 61 - 9 7 58 - 7 28 31 - 9 44 43 - 6 51 39 - 41 0 0 - 8 53 53 12 35 30 11 121 62 - 9 43 28 - 8 4 15 -10 20 8 - 7 27 28 - 40 0 0 - 9 29 8 12 35 31 12 121 63 -10 18 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6 12 41 20 1 237 -48 7 57 20 9 38 56 7 19 47 10 16 35 124 0 0 .. .. .. .. .. .. .. .. .. 8 35 52 .. .. .. 7 58 21 .. .. .. Data for the target star ------------------------ * name: TYC 7396-00123-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 13 11.4906 DE: -32 19 22.743 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .022, .022 ) * V mag [mag]: 11.3 * B mag [mag]: 11.8 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (139) Juewa approx. diameter [km]: 157 approx. diameter ["]: .063 distance from Earth [AU]: 3.46300 * orbital information: orbit source: Preston date of fit: 2007 Oct 23 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 646 number of rejected observations: 102 time covered by the observations: 1912 Dec 31 - 2007 Jul 14 1 sigma uncertainty ellipse (major, minor, PA): 0.013, 0.009, 88° remarks: * orbital elements for (139) Juewa : Mean anomaly = 101.32550055 deg Arg. of pericenter = 166.37004535 deg Long. of node = 1.92623910 deg Inclination = 10.89853062 deg Eccentricity = 0.17328945 Semimajor axis = 2.78420348 AU Perihelion dist = 2.30173041 AU Mag: H = 7.85, G = 0.15 Epoch of elements : MJD 54408.52700000 TDT (2007 Nov 04.527) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Nov 04 139 Juewa 12h 38.4m UT 11.3 18 13 11.491-32 19 22.74TYC 7396-00123-1 11.8 13.7 157 4.4 3.463 4.043 6.49 40.320 -32.325 -13.70 -15.35 12.6398 -.00924 .06482 20.18158 2.55342 0.00464 -0.00046 2000 99.516458020071027.00000166.370045 1.926239 10.8985310.173289452.784203482.301730417.785 0.15 RATE 2.1215460 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.025 0.024 89.5 1.370 0.023 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Oct 23, 22:25 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org