IOTA/IOTA-ES occultation update for (1665) Gaby / TYC 5272-02558-1 event on 2007 Oct 03, 23:23 UT Visible from India, Africa, Brazil, Bolivia Summary ------- On 2007 Oct 03 UT, the 14 km diameter asteroid (1665) Gaby will occult a 9.9 mag star in the constellation Cetus for observers along a path across India, Africa, Brazil, Bolivia. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.9 mag to 14.8 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: 20 * date and approx. time of event: 2007 Oct 03, 23:12 - 2007 Oct 03, 23:33 UT * midpoint of event [JD]: 2454377.47443333 * magnitude of target star: 9.9 * magnitude drop [mag]: 4.9 * estimated maximum duration [s]: 1.4 * Moon: 44 % sunlit, 102° distance * Sun: 161° distance * rough path description: India, Africa, Brazil, Bolivia Additional comments ------------------- 17" double star. The occultation path -------------------- * approximate projected width [km]: 14 * 1 sigma uncertainty interval [path widths]: +/- 3.41 * 1 sigma uncertainty interval [seconds]: +/- 6.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .066 +/- .051) * 1 sigma uncertainty ellipse (major, minor, PA): ( .068", .048", 70° ) * approx speed of asteroid's shadow [km/s]: 10.2040 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5272-02558-1 by 1665 Gaby on 2007 Oct 03 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 - 86 0 0 -14 54 52 23 33 32 1 105 1 -14 50 55 -14 58 50 -14 23 53 .. .. .. - 85 0 0 -15 10 25 23 33 32 2 105 0 -15 6 28 -15 14 22 -14 39 30 -15 41 19 - 84 0 0 -15 25 32 23 33 32 3 105 -1 -15 21 36 -15 29 29 -14 54 40 -15 56 22 - 83 0 0 -15 40 14 23 33 31 4 104 -2 -15 36 17 -15 44 10 -15 9 25 -16 11 1 - 82 0 0 -15 54 29 23 33 30 5 104 -3 -15 50 33 -15 58 25 -15 23 44 -16 25 13 - 81 0 0 -16 8 19 23 33 29 5 104 -4 -16 4 23 -16 12 14 -15 37 36 -16 38 59 - 80 0 0 -16 21 43 23 33 28 6 104 -5 -16 17 47 -16 25 38 -15 51 3 -16 52 20 - 79 0 0 -16 34 40 23 33 27 7 103 -6 -16 30 46 -16 38 35 -16 4 4 -17 5 15 - 78 0 0 -16 47 12 23 33 25 8 103 -7 -16 43 18 -16 51 6 -16 16 38 -17 17 44 - 77 0 0 -16 59 18 23 33 24 9 103 -7 -16 55 24 -17 3 12 -16 28 47 -17 29 47 - 76 0 0 -17 10 58 23 33 22 10 102 -8 -17 7 4 -17 14 52 -16 40 30 -17 41 25 - 75 0 0 -17 22 12 23 33 20 11 102 -9 -17 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37 24 55 33 25 31 7 24 28 5 90 0 0 25 17 44 23 12 52 5 251 -10 25 21 45 25 13 43 25 49 12 24 46 18 91 0 0 25 35 31 23 12 51 4 252 -9 25 39 32 25 31 30 26 6 56 25 4 8 92 0 0 25 52 55 23 12 51 3 252 -8 25 56 56 25 48 55 26 24 17 25 21 36 93 0 0 26 9 57 23 12 50 2 253 -7 26 13 58 26 5 58 26 41 15 25 38 42 94 0 0 26 26 37 23 12 50 1 253 -6 26 30 37 26 22 37 26 57 51 25 55 24 95 0 0 26 42 54 23 12 50 0 253 -5 26 46 53 26 38 55 .. .. .. 26 11 45 Data for the target star ------------------------ * name: TYC 5272-02558-1 * constellation : Cetus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 00 52 03.6448 DE: -14 51 16.953 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .019, .019 ) * V mag [mag]: 9.9 * B mag [mag]: 10.3 * Apparent position with proper motion RA(deg): 13.1196741090 DE(deg): -14.8092134714 * Equation of equinoxes (radians) : 0.000029918134493 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1665) Gaby approx. diameter [km]: 14 approx. diameter ["]: .014 distance from Earth [AU]: 1.34100 * orbital information: orbit source: Preston date of fit: 2007 Aug 29 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 503 number of rejected observations: 21 time covered by the observations: 1930 Feb 27 - 2007 Aug 18 1 sigma uncertainty ellipse (major, minor, PA): 0.066, 0.044, 68° remarks: * orbital elements for (1665) Gaby : Mean anomaly = 293.60932507 deg Arg. of pericenter = 6.08847849 deg Long. of node = 91.66592142 deg Inclination = 10.83265944 deg Eccentricity = 0.20774506 Semimajor axis = 2.41348625 AU Perihelion dist = 1.91209641 AU Mag: H = 11.71, G = 0.15 Epoch of elements : MJD 54376.97400000 TDT (2007 Oct 03.974) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Oct 03 1665 Gaby 23h 23.2m UT 9.9 0 52 3.645-14 51 16.95TYC 5272-02558-1 10.3 14.8 14 1.4 1.341 -2.426 -13.75 9.937 -14.851 186.46 -4.11 23.3864 -.03927 .10015 -5.36321 -2.09933 -0.00038 0.00178 2000 291.7760872007 927.00000 6.088478 91.665921 10.8326590.207745062.413486251.9120964111.85 0.15 RATE 2.6286740 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.068 0.048 69.6 4.410 0.048 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Sep 03, 06:01 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org