IOTA/IOTA-ES occultation update for (676) Melitta / TYC 4694-00327-1 event on 2008 Nov 06, 16:04 UT Visible from New Guinea Summary ------- On 2008 Nov 06 UT, the 80 km diameter asteroid (676) Melitta will occult a 10.7 mag star in the constellation Cetus for observers along a path across New Guinea. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.9 mag to 13.5 mag (the magnitude of the asteroid) for at most 7.0 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 94 * date and approx. time of event: 2008 Nov 06, 15:55 - 2008 Nov 06, 16:13 UT * magnitude of target star: 10.7 * magnitude drop [mag]: 2.9 * estimated maximum duration [s]: 7.0 * Moon: 55 % sunlit, 74° distance * Sun: 159° distance * rough path description: New Guinea The occultation path -------------------- * approximate projected width [km]: 81 * 1 sigma uncertainty interval [path widths]: +/- 0.45 * 1 sigma uncertainty interval [seconds]: +/- 4.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .035 +/- .026) * 1 sigma uncertainty ellipse (major, minor, PA): ( .035", .026", 83° ) * approx speed of asteroid's shadow [km/s]: 11.3478 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 4694-00327-1 by 676 Melitta on 2008 Nov 6 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 33 0 0 -30 0 5 16 13 39 15 86 -1 -29 38 3 -30 22 10 -29 18 13 -30 42 3 34 0 0 -29 59 0 16 13 37 16 85 -2 -29 36 57 -30 21 4 -29 17 7 -30 40 58 35 0 0 -29 57 36 16 13 34 17 85 -2 -29 35 33 -30 19 41 -29 15 43 -30 39 35 36 0 0 -29 55 55 16 13 32 18 84 -3 -29 33 52 -30 18 0 -29 14 2 -30 37 55 37 0 0 -29 53 56 16 13 29 19 84 -4 -29 31 52 -30 16 2 -29 12 2 -30 35 56 38 0 0 -29 51 40 16 13 26 20 83 -5 -29 29 36 -30 13 46 -29 9 45 -30 33 41 39 0 0 -29 49 6 16 13 23 21 83 -6 -29 27 1 -30 11 12 -29 7 10 -30 31 7 40 0 0 -29 46 14 16 13 20 21 82 -6 -29 24 9 -30 8 21 -29 4 17 -30 28 17 41 0 0 -29 43 5 16 13 17 22 82 -7 -29 20 59 -30 5 12 -29 1 7 -30 25 8 42 0 0 -29 39 38 16 13 14 23 81 -8 -29 17 32 -30 1 46 -28 57 40 -30 21 43 43 0 0 -29 35 54 16 13 10 24 81 -9 -29 13 47 -29 58 2 -28 53 54 -30 17 59 44 0 0 -29 31 52 16 13 7 25 80 -10 -29 9 45 -29 54 1 -28 49 52 -30 13 59 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0 0 7 24 3 15 55 38 5 265 -12 7 46 13 7 1 51 8 6 9 6 41 51 -162 0 0 7 29 50 15 55 37 4 265 -11 7 51 59 7 7 38 8 11 54 6 47 39 -161 0 0 7 35 16 15 55 37 3 265 -10 7 57 25 7 13 6 8 17 20 6 53 7 -160 0 0 7 40 23 15 55 36 2 266 -9 8 2 31 7 18 13 8 22 25 6 58 14 -159 0 0 7 45 9 15 55 36 1 266 -8 8 7 17 7 23 0 8 27 10 7 3 2 Uncertainty in time = +/- 4 secs [Prediction of 2008 Oct 30.0] Data for the target star ------------------------ * name: TYC 4694-00327-1 * constellation : Cetus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 02 28 29.3502 DE: -04 13 56.070 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .024, .020 ) * V mag [mag]: 10.7 * B mag [mag]: 11.3 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (676) Melitta approx. diameter [km]: 80 approx. diameter ["]: .058 distance from Earth [AU]: 1.91600 * orbital information: orbit source: Preston date of fit: 2008 Oct 30 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 871 number of rejected observations: 67 time covered by the observations: 1909 Jan 17 - 2008 Oct 19 1 sigma uncertainty ellipse (major, minor, PA): 0.026, 0.016, 78° remarks: * orbital elements for (676) Melitta : Mean anomaly = 53.15508984 deg Arg. of pericenter = 181.61436483 deg Long. of node = 150.41546626 deg Inclination = 12.86579080 deg Eccentricity = 0.12550096 Semimajor axis = 3.05912298 AU Perihelion dist = 2.67520012 AU Mag: H = 9.36, G = 0.15 Epoch of elements : MJD 54776.67000000 TDT (2008 Nov 06.670) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Nov 6 676 Melitta 16h 4.8m UT 10.7 2 28 29.350- 4 13 56.07TYC 4694-00327-1 11.3 13.5 80 7.0 1.916 -1.862 -9.36 109.6774 -4.230 -65.28 -16.23 16.0801 0.05969 -0.17801 -6.07113 -2.04100 0.00051 0.00206 2000 51.92642220081031.00000181.614365150.415466 12.8657910.12550096 3.0591230 2.6752001 9.3 5.00.15 RATE 1.8420810 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.035 0.026 83 1.45 0.026 0 54769.5020081106_0327-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Oct 30, 14:03 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org