IOTA/IOTA-ES occultation update for (4732) Froeschle / TYC 0217-01166-1 event on 2007 Oct 01, 09:46 UT Visible from USA Summary ------- On 2007 Oct 01 UT, the 30 km diameter asteroid (4732) Froeschle will occult a 8.4 mag star in the constellation Hydra for observers along a path across USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 9.1 mag to 17.5 mag (the magnitude of the asteroid) for at most 0.9 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: 18 * date and approx. time of event: 2007 Oct 01, 09:43 - 2007 Oct 01, 09:49 UT * midpoint of event [JD]: 2454374.90721667 * magnitude of target star: 8.4 * magnitude drop [mag]: 9.1 * estimated maximum duration [s]: 0.9 * Moon: 72 % sunlit, 67° distance * Sun: 53° distance * rough path description: USA The occultation path -------------------- * approximate projected width [km]: 31 * 1 sigma uncertainty interval [path widths]: +/- 3.83 * 1 sigma uncertainty interval [seconds]: +/- 4.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .056 +/- .042) * 1 sigma uncertainty ellipse (major, minor, PA): ( .057", .041", 104° ) * approx speed of asteroid's shadow [km/s]: 34.1413 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0217-01166-1 by 4732 Froeschle on 2007 Oct 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 -114 0 0 .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 43 47 14 -113 0 0 42 36 35 9 43 24 1 87 -40 42 28 9 42 45 1 .. .. .. 43 49 51 -112 0 0 42 38 52 9 43 24 1 88 -39 42 30 26 42 47 18 .. .. .. 43 52 6 -111 0 0 42 40 47 9 43 24 2 88 -38 42 32 22 42 49 13 .. .. .. 43 54 0 -110 0 0 42 42 21 9 43 24 3 89 -38 42 33 56 42 50 47 .. .. .. 43 55 32 -109 0 0 42 43 33 9 43 24 4 90 -37 42 35 7 42 51 58 .. .. .. 43 56 43 -108 0 0 42 44 22 9 43 24 4 90 -37 42 35 57 42 52 48 41 31 39 43 57 32 -107 0 0 42 44 50 9 43 25 5 91 -36 42 36 25 42 53 16 41 32 7 43 57 59 -106 0 0 42 44 57 9 43 25 6 92 -35 42 36 32 42 53 22 41 32 14 43 58 5 -105 0 0 42 44 41 9 43 25 7 92 -35 42 36 16 42 53 6 41 31 58 43 57 50 -104 0 0 42 44 4 9 43 25 7 93 -34 42 35 38 42 52 29 41 31 20 43 57 13 -103 0 0 42 43 4 9 43 26 8 94 -34 42 34 39 42 51 30 41 30 20 43 56 14 -102 0 0 42 41 43 9 43 26 9 94 -33 42 33 18 42 50 9 41 28 58 43 54 54 -101 0 0 42 40 0 9 43 26 10 95 -32 42 31 34 42 48 26 41 27 13 43 53 12 -100 0 0 42 37 55 9 43 27 10 96 -32 42 29 29 42 46 21 41 25 6 43 51 8 - 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9 24 25 - 6 54 10 45 0 0 - 8 23 3 9 49 10 21 276 74 - 8 31 43 - 8 14 24 - 9 37 49 - 7 7 49 46 0 0 - 8 36 6 9 49 11 20 276 73 - 8 44 44 - 8 27 27 - 9 50 44 - 7 20 59 47 0 0 - 8 48 39 9 49 12 19 276 72 - 8 57 17 - 8 40 1 -10 3 10 - 7 33 40 48 0 0 - 9 0 43 9 49 13 18 276 71 - 9 9 20 - 8 52 6 -10 15 7 - 7 45 52 49 0 0 - 9 12 19 9 49 14 17 276 70 - 9 20 55 - 9 3 42 -10 26 35 - 7 57 34 50 0 0 - 9 23 24 9 49 15 16 276 69 - 9 32 0 - 9 14 49 -10 37 35 - 8 8 47 51 0 0 - 9 34 1 9 49 16 15 275 68 - 9 42 36 - 9 25 26 -10 48 5 - 8 19 30 52 0 0 - 9 44 9 9 49 17 14 275 67 - 9 52 42 - 9 35 34 -10 58 6 - 8 29 43 53 0 0 - 9 53 47 9 49 18 13 275 66 -10 2 20 - 9 45 13 -11 7 39 - 8 39 27 54 0 0 -10 2 56 9 49 19 12 275 65 -10 11 28 - 9 54 23 -11 16 42 - 8 48 42 55 0 0 -10 11 35 9 49 20 11 275 64 -10 20 7 -10 3 3 -11 25 16 - 8 57 27 56 0 0 -10 19 46 9 49 20 10 275 63 -10 28 17 -10 11 14 -11 33 22 - 9 5 42 57 0 0 -10 27 27 9 49 21 9 274 62 -10 35 57 -10 18 55 -11 40 58 - 9 13 28 58 0 0 -10 34 38 9 49 21 8 274 61 -10 43 9 -10 26 8 -11 48 5 - 9 20 44 59 0 0 -10 41 21 9 49 22 7 274 60 -10 49 50 -10 32 51 -11 54 43 - 9 27 31 60 0 0 -10 47 34 9 49 22 6 274 59 -10 56 3 -10 39 4 -12 0 53 - 9 33 48 61 0 0 -10 53 18 9 49 22 5 274 58 -11 1 47 -10 44 49 -12 6 33 - 9 39 36 62 0 0 -10 58 32 9 49 23 4 274 57 -11 7 1 -10 50 4 .. .. .. - 9 44 54 63 0 0 -11 3 18 9 49 23 3 273 56 -11 11 46 -10 54 49 .. .. .. - 9 49 42 64 0 0 -11 7 34 9 49 23 2 273 55 -11 16 2 -10 59 6 .. .. .. - 9 54 1 65 0 0 -11 11 21 9 49 23 1 273 54 -11 19 49 -11 2 53 .. .. .. - 9 57 51 66 0 0 -11 14 39 9 49 23 0 273 54 -11 23 6 -11 6 11 .. .. .. -10 1 11 Data for the target star ------------------------ * name: TYC 0217-01166-1 * constellation : Hydra * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 08 55 59.7107 DE: +02 42 25.540 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .018, .019 ) * V mag [mag]: 8.4 * B mag [mag]: 9.6 * Apparent position with proper motion RA(deg): 134.0983040500 DE(deg): 2.6803800140 * Equation of equinoxes (radians) : 0.000028711694942 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (4732) Froeschle approx. diameter [km]: 30 approx. diameter ["]: .011 distance from Earth [AU]: 3.70200 * orbital information: orbit source: Preston date of fit: 2007 Aug 29 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 646 number of rejected observations: 13 time covered by the observations: 1955 Oct 25 - 2007 Mar 10 1 sigma uncertainty ellipse (major, minor, PA): 0.054, 0.037, 106° remarks: * orbital elements for (4732) Froeschle : Mean anomaly = 98.54643446 deg Arg. of pericenter = 148.80854175 deg Long. of node = 226.54140105 deg Inclination = 16.85255859 deg Eccentricity = 0.06762533 Semimajor axis = 3.16086853 AU Perihelion dist = 2.94711374 AU Mag: H = 11.26, G = 0.15 Epoch of elements : MJD 54374.40700000 TDT (2007 Oct 01.407) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Oct 01 4732 Froeschle 9h 46.4m UT 8.4 8 55 59.711 2 42 25.54TYC 0217-01166-1 9.6 17.5 30 0.9 3.702 2.727 -20.65 -22.350 2.713 30.86 -3.11 9.7732 .12192 .23971 17.19911 -8.69109 -0.00462 0.00046 2000 97.77350872007 927.00000148.808542226.541401 16.8525590.067625333.160868532.9471137411.35 0.15 RATE 1.7538580 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.057 0.041 104.5 4.830 0.042 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Sep 03, 05:32 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org