IOTA/IOTA-ES occultation update for (2763) Jeans / TYC 6332-00990-1 event on 2008 Oct 04, 23:09 UT Visible from S Africa Summary ------- On 2008 Oct 04 UT, the 10 km diameter asteroid (2763) Jeans will occult a 10.5 mag star in the constellation Capricornus for observers along a path across S Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.3 mag to 15.8 mag (the magnitude of the asteroid) for at most 1.0 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: 16 * date and approx. time of event: 2008 Oct 04, 23:06 - 2008 Oct 04, 23:17 UT * magnitude of target star: 10.5 * magnitude drop [mag]: 5.3 * estimated maximum duration [s]: 1.0 * Moon: 29 % sunlit, 47° distance * Sun: 111° distance * rough path description: S Africa The occultation path -------------------- * approximate projected width [km]: 13 * 1 sigma uncertainty interval [path widths]: +/- 4.10 * 1 sigma uncertainty interval [seconds]: +/- 4.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .047 +/- .045) * 1 sigma uncertainty ellipse (major, minor, PA): ( .048", .045", 71° ) * approx speed of asteroid's shadow [km/s]: 10.2031 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6332-00990-1 by 2763 Jeans on 2008 Oct 4 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 - 69 0 0 -64 43 0 23 6 11 42 17 0 -64 46 50 -64 39 11 -65 18 25 -64 7 56 - 68 0 0 -64 34 29 23 6 15 42 16 -1 -64 38 19 -64 30 38 -65 10 0 -63 59 18 - 67 0 0 -64 25 39 23 6 20 42 15 -1 -64 29 30 -64 21 48 -65 1 16 -63 50 22 - 66 0 0 -64 16 31 23 6 24 43 13 -2 -64 20 23 -64 12 39 -64 52 15 -63 41 7 - 65 0 0 -64 7 4 23 6 29 43 12 -2 -64 10 57 -64 3 11 -64 42 55 -63 31 34 - 64 0 0 -63 57 18 23 6 34 43 11 -2 -64 1 12 -63 53 25 -64 33 17 -63 21 42 - 63 0 0 -63 47 14 23 6 39 43 9 -3 -63 51 8 -63 43 20 -64 23 19 -63 11 30 - 62 0 0 -63 36 50 23 6 44 44 8 -3 -63 40 45 -63 32 55 -64 13 2 -63 0 59 - 61 0 0 -63 26 6 23 6 49 44 7 -4 -63 30 2 -63 22 11 -64 2 27 -62 50 8 - 60 0 0 -63 15 3 23 6 54 44 5 -4 -63 19 0 -63 11 7 -63 51 31 -62 38 58 - 59 0 0 -63 3 40 23 6 59 44 4 -5 -63 7 38 -62 59 43 -63 40 15 -62 27 27 - 58 0 0 -62 51 57 23 7 4 45 3 -5 -62 55 55 -62 47 59 -63 28 40 -62 15 36 - 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16 0 0 -48 58 26 23 11 59 44 299 -32 -49 2 55 -48 53 58 -49 39 54 -48 17 30 - 15 0 0 -48 30 40 23 12 7 44 297 -33 -48 35 9 -48 26 11 -49 12 9 -47 49 43 - 14 0 0 -48 2 37 23 12 16 43 296 -34 -48 7 6 -47 58 8 -48 44 7 -47 21 38 - 13 0 0 -47 34 18 23 12 24 43 294 -34 -47 38 47 -47 29 49 -48 15 49 -46 53 19 - 12 0 0 -47 5 44 23 12 33 43 293 -35 -47 10 13 -47 1 15 -47 47 15 -46 24 44 - 11 0 0 -46 36 56 23 12 41 42 291 -36 -46 41 25 -46 32 27 -47 18 27 -45 55 56 - 10 0 0 -46 7 54 23 12 50 42 290 -36 -46 12 23 -46 3 25 -46 49 25 -45 26 55 - 9 0 0 -45 38 40 23 12 58 41 289 -37 -45 43 9 -45 34 11 -46 20 10 -44 57 42 - 8 0 0 -45 9 14 23 13 7 40 287 -38 -45 13 43 -45 4 46 -45 50 44 -44 28 17 - 7 0 0 -44 39 39 23 13 15 40 286 -39 -44 44 7 -44 35 10 -45 21 6 -43 58 43 - 6 0 0 -44 9 53 23 13 23 39 285 -39 -44 14 22 -44 5 25 -44 51 19 -43 29 0 - 5 0 0 -43 39 59 23 13 32 39 283 -40 -43 44 28 -43 35 31 -44 21 22 -42 59 8 - 4 0 0 -43 9 58 23 13 40 38 282 -41 -43 14 26 -43 5 31 -43 51 19 -42 29 10 - 3 0 0 -42 39 51 23 13 48 37 281 -41 -42 44 19 -42 35 24 -43 21 8 -41 59 6 - 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Uncertainty in time = +/- 4 secs [Prediction of 2008 Oct 1.0] Data for the target star ------------------------ * name: TYC 6332-00990-1 * constellation : Capricornus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 20 18 47.3814 DE: -17 27 42.678 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .025, .027 ) * V mag [mag]: 10.5 * B mag [mag]: 12.2 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2763) Jeans approx. diameter [km]: 10 approx. diameter ["]: .011 distance from Earth [AU]: 1.28100 * orbital information: orbit source: Preston date of fit: 2008 Sep 30 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 718 number of rejected observations: 20 time covered by the observations: 1930 Oct 15 - 2008 Sep 07 1 sigma uncertainty ellipse (major, minor, PA): 0.041, 0.037, 64° remarks: * orbital elements for (2763) Jeans : Mean anomaly = 353.79168978 deg Arg. of pericenter = 33.65820392 deg Long. of node = 308.87429440 deg Inclination = 3.53907365 deg Eccentricity = 0.21753342 Semimajor axis = 2.40379160 AU Perihelion dist = 1.88088659 AU Mag: H = 12.13, G = 0.15 Epoch of elements : MJD 54743.96500000 TDT (2008 Oct 04.965) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Oct 4 2763 Jeans 23h 9.4m UT 10.5 20 18 47.381-17 27 42.68TYC 6332-00990-1 12.2 15.8 10 1.0 1.281 2.638 11.82 -56.6688 -17.466 -170.24 -4.78 23.1572 0.19994 -0.64096 5.49581 1.72083 0.00470 0.00103 2000 352.743109200810 1.00000 33.658204308.874294 3.5390740.21753342 2.4037916 1.880886612.6 5.00.15 RATE 2.6445930 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.048 0.045 71 5.10 0.044 0 54740.5020081004_0990-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Oct 01, 03:56 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org