IOTA/IOTA-ES occultation update for (2567) Elba / TYC 4687-01569-1 event on 2007 Nov 04, 15:03 UT Visible from Indonesia Summary ------- On 2007 Nov 04 UT, the 24 km diameter asteroid (2567) Elba will occult a 10.9 mag star in the constellation Cetus 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 4.5 mag to 15.4 mag (the magnitude of the asteroid) for at most 2.9 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: 21 * date and approx. time of event: 2007 Nov 04, 14:50 - 2007 Nov 04, 15:16 UT * magnitude of target star: 10.9 * magnitude drop [mag]: 4.5 * estimated maximum duration [s]: 2.9 * Moon: 24 % sunlit, 140° distance * Sun: 155° distance * rough path description: Indonesia The occultation path -------------------- * approximate projected width [km]: 24 * 1 sigma uncertainty interval [path widths]: +/- 3.27 * 1 sigma uncertainty interval [seconds]: +/- 14.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .107 +/- .072) * 1 sigma uncertainty ellipse (major, minor, PA): ( .109", .069", 75° ) * approx speed of asteroid's shadow [km/s]: 8.3062 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 4687-01569-1 by 2567 Elba 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 21 0 0 -16 39 40 15 16 28 1 94 19 -16 33 8 -16 46 11 -15 50 29 -17 28 51 22 0 0 -16 43 37 15 16 27 2 94 18 -16 37 6 -16 50 8 -15 54 27 -17 32 47 23 0 0 -16 47 17 15 16 27 2 93 17 -16 40 46 -16 53 48 -15 58 8 -17 36 26 24 0 0 -16 50 41 15 16 26 3 93 16 -16 44 10 -16 57 12 -16 1 33 -17 39 49 25 0 0 -16 53 47 15 16 25 4 93 15 -16 47 16 -17 0 18 -16 4 40 -17 42 54 26 0 0 -16 56 36 15 16 24 5 93 14 -16 50 5 -17 3 7 -16 7 30 -17 45 43 27 0 0 -16 59 8 15 16 23 6 92 14 -16 52 38 -17 5 39 -16 10 2 -17 48 14 28 0 0 -17 1 24 15 16 21 7 92 13 -16 54 53 -17 7 54 -16 12 18 -17 50 29 29 0 0 -17 3 22 15 16 20 8 92 12 -16 56 51 -17 9 52 -16 14 17 -17 52 27 30 0 0 -17 5 3 15 16 18 9 91 11 -16 58 32 -17 11 33 -16 15 58 -17 54 8 31 0 0 -17 6 27 15 16 16 10 91 10 -16 59 57 -17 12 58 -16 17 23 -17 55 32 32 0 0 -17 7 35 15 16 13 11 91 9 -17 1 4 -17 14 5 -16 18 31 -17 56 39 33 0 0 -17 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29 14 51 24 15 47 16 14 8 36 -159 0 0 15 3 58 14 50 56 6 264 -25 15 10 30 14 57 25 15 53 16 14 14 38 -158 0 0 15 9 43 14 50 55 5 265 -24 15 16 15 15 3 10 15 59 0 14 20 25 -157 0 0 15 15 12 14 50 54 4 265 -23 15 21 44 15 8 40 16 4 28 14 25 55 -156 0 0 15 20 24 14 50 53 3 265 -22 15 26 56 15 13 52 16 9 39 14 31 9 -155 0 0 15 25 20 14 50 53 2 265 -21 15 31 52 15 18 49 16 14 34 14 36 6 -154 0 0 15 30 0 14 50 52 1 266 -20 15 36 31 15 23 28 16 19 12 14 40 47 Data for the target star ------------------------ * name: TYC 4687-01569-1 * constellation : Cetus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 01 36 27.9177 DE: -04 05 12.091 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .025, .028 ) * V mag [mag]: 10.9 * B mag [mag]: 11.5 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2567) Elba approx. diameter [km]: 24 approx. diameter ["]: .021 distance from Earth [AU]: 1.55200 * orbital information: orbit source: Preston date of fit: 2007 Oct 23 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 653 number of rejected observations: 27 time covered by the observations: 1979 May 19 - 2007 Sep 21 1 sigma uncertainty ellipse (major, minor, PA): 0.106, 0.063, 74° remarks: * orbital elements for (2567) Elba : Mean anomaly = 42.85786404 deg Arg. of pericenter = 191.41609451 deg Long. of node = 142.79023067 deg Inclination = 8.90046983 deg Eccentricity = 0.13834595 Semimajor axis = 2.73812052 AU Perihelion dist = 2.35931262 AU Mag: H = 11.68, G = 0.15 Epoch of elements : MJD 54408.62800000 TDT (2007 Nov 04.628) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Nov 04 2567 Elba 15h 3.7m UT 10.9 1 36 27.918- 4 5 12.09TYC 4687-01569-1 11.5 15.4 24 2.9 1.552 -1.705 -7.32 -245.281 -4.085 -50.02 -15.38 15.0611 .00241 -.00891 -4.50588 -1.29479 0.00143 0.00189 2000 40.980988920071027.00000191.416095142.790231 8.9004700.138345952.738120522.3593126211.85 0.15 RATE 2.1753304 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.109 0.069 74.9 4.270 0.070 ------ 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