IOTA/IOTA-ES occultation update for (654) Zelinda / TYC 2357-00045-1 event on 2008 Jul 05, 03:01 UT Visible from Africa Summary ------- On 2008 Jul 05 UT, the 129 km diameter asteroid (654) Zelinda will occult a 10.4 mag star in the constellation Perseus for observers along a path across Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.1 mag to 13.4 mag (the magnitude of the asteroid) for at most 3.0 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: 99 * date and approx. time of event: 2008 Jul 05, 02:58 - 2008 Jul 05, 02:59 UT * midpoint of event [JD]: 2454652.625775 * magnitude of target star: 10.4 * magnitude drop [mag]: 3.1 * estimated maximum duration [s]: 3.0 * Moon: 6 % sunlit, 68° distance * Sun: 42° distance * rough path description: Africa Additional comments ------------------- wide double star The occultation path -------------------- * approximate projected width [km]: 134 * 1 sigma uncertainty interval [path widths]: +/- 0.28 * 1 sigma uncertainty interval [seconds]: +/- 0.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .018 +/- .018) * 1 sigma uncertainty ellipse (major, minor, PA): ( .018", .018", 91° ) * approx speed of asteroid's shadow [km/s]: 42.4452 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 2357-00045-1 by 654 Zelinda on 2008 Jul 5 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 15 0 0 -21 19 39 2 58 42 0 55 -36 -22 3 45 -20 35 44 .. .. .. -20 11 13 16 0 0 -20 40 43 2 58 42 2 55 -35 -21 24 51 -19 56 47 -21 49 38 -19 32 15 17 0 0 -20 1 34 2 58 42 3 55 -34 -20 45 43 -19 17 36 -21 10 31 -18 53 4 18 0 0 -19 22 12 2 58 42 4 54 -33 -20 6 21 -18 38 13 -20 31 10 -18 13 40 19 0 0 -18 42 38 2 58 43 5 54 -32 -19 26 48 -17 58 38 -19 51 37 -17 34 5 20 0 0 -18 2 54 2 58 43 6 54 -31 -18 47 4 -17 18 54 -19 11 54 -16 54 21 21 0 0 -17 23 1 2 58 43 7 53 -30 -18 7 11 -16 39 2 -18 32 1 -16 14 28 22 0 0 -16 43 1 2 58 44 8 53 -28 -17 27 11 -15 59 2 -17 51 59 -15 34 29 23 0 0 -16 2 54 2 58 44 10 53 -27 -16 47 3 -15 18 57 -17 11 52 -14 54 24 24 0 0 -15 22 43 2 58 45 11 52 -26 -16 6 51 -14 38 47 -16 31 39 -14 14 15 25 0 0 -14 42 29 2 58 45 12 52 -25 -15 26 35 -13 58 35 -15 51 22 -13 34 4 26 0 0 -14 2 14 2 58 46 13 52 -24 -14 46 17 -13 18 21 -15 11 3 -12 53 51 27 0 0 -13 21 57 2 58 47 14 52 -23 -14 5 59 -12 38 7 -14 30 43 -12 13 39 28 0 0 -12 41 42 2 58 48 16 51 -22 -13 25 41 -11 57 55 -13 50 23 -11 33 28 29 0 0 -12 1 30 2 58 49 17 51 -21 -12 45 25 -11 17 46 -13 10 6 -10 53 21 30 0 0 -11 21 22 2 58 50 18 51 -19 -12 5 13 -10 37 41 -12 29 52 -10 13 18 31 0 0 -10 41 19 2 58 51 19 51 -18 -11 25 6 - 9 57 42 -11 49 43 - 9 33 21 32 0 0 -10 1 23 2 58 52 20 50 -17 -10 45 6 - 9 17 50 -11 9 40 - 8 53 31 33 0 0 - 9 21 35 2 58 53 21 50 -16 -10 5 14 - 8 38 7 -10 29 45 - 8 13 51 34 0 0 - 8 41 57 2 58 54 23 50 -15 - 9 25 31 - 7 58 34 - 9 49 59 - 7 34 20 35 0 0 - 8 2 30 2 58 55 24 50 -14 - 8 45 59 - 7 19 12 - 9 10 24 - 6 55 1 36 0 0 - 7 23 15 2 58 57 25 50 -12 - 8 6 39 - 6 40 3 - 8 31 1 - 6 15 55 37 0 0 - 6 44 15 2 58 58 26 49 -11 - 7 27 32 - 6 1 8 - 7 51 51 - 5 37 3 38 0 0 - 6 5 29 2 59 0 27 49 -10 - 6 48 40 - 5 22 28 - 7 12 56 - 4 58 27 39 0 0 - 5 27 0 2 59 1 29 49 -9 - 6 10 5 - 4 44 5 - 6 34 17 - 4 20 7 40 0 0 - 4 48 48 2 59 3 30 49 -8 - 5 31 46 - 4 6 0 - 5 55 55 - 3 42 6 41 0 0 - 4 10 55 2 59 4 31 49 -7 - 4 53 46 - 3 28 13 - 5 17 51 - 3 4 23 42 0 0 - 3 33 21 2 59 6 32 48 -5 - 4 16 6 - 2 50 47 - 4 40 7 - 2 27 1 43 0 0 - 2 56 9 2 59 8 33 48 -4 - 3 38 47 - 2 13 42 - 4 2 43 - 1 50 0 44 0 0 - 2 19 19 2 59 9 34 48 -3 - 3 1 49 - 1 36 59 - 3 25 42 - 1 13 21 45 0 0 - 1 42 52 2 59 11 35 48 -2 - 2 25 15 - 1 0 40 - 2 49 3 - 0 37 6 46 0 0 - 1 6 50 2 59 13 37 48 -1 - 1 49 4 - 0 24 45 - 2 12 48 - 0 1 15 Uncertainty in time = +/- 1 secs [Prediction of 2008 May 22.0] Data for the target star ------------------------ * name: TYC 2357-00045-1 * constellation : Perseus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 03 54 05.8801 DE: +31 51 26.441 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .016, .017 ) * V mag [mag]: 10.4 * B mag [mag]: 11.0 * Apparent position with proper motion RA(deg): 58.6569719559 DE(deg): 31.8826636226 * Equation of equinoxes (radians) : 0.000051893485547 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (654) Zelinda approx. diameter [km]: 129 approx. diameter ["]: .063 distance from Earth [AU]: 2.81800 * orbital information: orbit source: Preston date of fit: 2008 May 22 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 944 number of rejected observations: 68 time covered by the observations: 1908 Jan 04 - 2008 Jan 09 1 sigma uncertainty ellipse (major, minor, PA): 0.008, 0.006, 95° remarks: * orbital elements for (654) Zelinda : Mean anomaly = 297.21171103 deg Arg. of pericenter = 213.96684433 deg Long. of node = 278.57136929 deg Inclination = 18.12872069 deg Eccentricity = 0.23234565 Semimajor axis = 2.29626742 AU Perihelion dist = 1.76273968 AU Mag: H = 8.51, G = 0.15 Epoch of elements : MJD 54652.12600000 TDT (2008 Jul 05.126) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jul 5 654 Zelinda 3h 1.1m UT 10.4 3 54 5.880 31 51 26.44TYC 2357-00045-1 11.0 13.4 129 3.0 2.818 5.778 13.13 89.7590 31.853 135.87 22.76 3.0186 0.04668 -0.26076 23.58434 4.21051 -0.00350 0.00004 2000 296.6095212008 7 3.00000213.966844278.571369 18.1287210.23234565 2.2962674 1.7627397 8.5 5.00.15 RATE 2.8325030 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.018 0.018 91 1.28 0.018 0 54608.5020080705_0045-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 May 26, 16:17 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org