IOTA/IOTA-ES occultation update for (1365) Henyey / TYC 4917-00022-1 event on 2008 Mar 27, 02:02 UT Visible from Brazil, Venezuela, Colombia, Central America, Mexico Summary ------- On 2008 Mar 27 UT, the 15 km diameter asteroid (1365) Henyey will occult a 9.0 mag star in the constellation Sextans for observers along a path across Brazil, Venezuela, Colombia, Central America, Mexico. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.3 mag to 14.3 mag (the magnitude of the asteroid) for at most 2.0 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: 34 * date and approx. time of event: 2008 Mar 27, 01:47 - 2008 Mar 27, 02:15 UT * midpoint of event [JD]: 2454552.58481667 * magnitude of target star: 9.0 * magnitude drop [mag]: 5.3 * estimated maximum duration [s]: 2.0 * Moon: 76 % sunlit, 80° distance * Sun: 157° distance * rough path description: Brazil, Venezuela, Colombia, Central America, Mexico The occultation path -------------------- * approximate projected width [km]: 15 * 1 sigma uncertainty interval [path widths]: +/- 1.94 * 1 sigma uncertainty interval [seconds]: +/- 5.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .049 +/- .037) * 1 sigma uncertainty ellipse (major, minor, PA): ( .050", .034", 112° ) * approx speed of asteroid's shadow [km/s]: 7.5081 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 4917-00022-1 by 1365 Henyey on 2008 Mar 27 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 -121 0 0 28 35 22 2 15 24 20 105 0 28 39 34 28 31 10 28 55 51 28 14 53 -120 0 0 28 21 17 2 15 19 21 105 -1 28 25 29 28 17 4 28 41 49 28 0 45 -119 0 0 28 6 43 2 15 14 22 106 -2 28 10 56 28 2 30 28 27 18 27 46 9 -118 0 0 27 51 42 2 15 9 23 106 -3 27 55 55 27 47 28 28 12 19 27 31 5 -117 0 0 27 36 12 2 15 4 24 107 -4 27 40 26 27 31 58 27 56 52 27 15 32 -116 0 0 27 20 14 2 14 58 25 107 -4 27 24 29 27 15 59 27 40 57 26 59 32 -115 0 0 27 3 48 2 14 52 26 108 -5 27 8 3 26 59 33 27 24 34 26 43 3 -114 0 0 26 46 54 2 14 46 27 108 -6 26 51 10 26 42 39 27 7 43 26 26 6 -113 0 0 26 29 33 2 14 40 28 109 -7 26 33 49 26 25 16 26 50 24 26 8 42 -112 0 0 26 11 43 2 14 34 29 109 -8 26 16 0 26 7 26 26 32 37 25 50 49 -111 0 0 25 53 25 2 14 27 29 109 -9 25 57 43 25 49 8 26 14 22 25 32 28 -110 0 0 25 34 40 2 14 20 30 110 -10 25 38 58 25 30 22 25 55 40 25 13 40 -109 0 0 25 15 27 2 14 13 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20 1 47 59 0 267 -20 -31 19 16 -31 27 24 -31 3 30 -31 43 10 Uncertainty in time = +/- 5 secs [Prediction of 2008 Feb 14.0] Data for the target star ------------------------ * name: TYC 4917-00022-1 * constellation : Sextans * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 10 50 29.7065 DE: -02 41 43.830 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .016, .022 ) * V mag [mag]: 9.0 * B mag [mag]: 9.6 * Apparent position with proper motion RA(deg): 162.7356506910 DE(deg): -2.7419274600 * Equation of equinoxes (radians) : 0.000040656598887 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1365) Henyey approx. diameter [km]: 15 approx. diameter ["]: .018 distance from Earth [AU]: 1.13600 * orbital information: orbit source: Preston date of fit: 2008 Feb 13 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 938 number of rejected observations: 51 time covered by the observations: 1928 Sep 09 - 2008 Jan 21 1 sigma uncertainty ellipse (major, minor, PA): 0.048, 0.027, 114° remarks: * orbital elements for (1365) Henyey : Mean anomaly = 310.86284546 deg Arg. of pericenter = 337.40627155 deg Long. of node = 258.67045390 deg Inclination = 5.07999436 deg Eccentricity = 0.12290986 Semimajor axis = 2.24850106 AU Perihelion dist = 1.97213811 AU Mag: H = 11.80, G = 0.15 Epoch of elements : MJD 54552.08500000 TDT (2008 Mar 27.085) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Mar 27 1365 Henyey 2h 2.1m UT 9.0 10 50 29.707- 2 41 43.83TYC 4917-00022-1 9.6 14.3 15 2.0 1.136 -1.866 17.13 -52.7920 -2.700 150.82 2.69 2.0356 0.00219 0.00375 -3.61383 2.21336 0.00212 0.00000 2000 310.2533502008 325.00000337.406272258.670454 5.0799940.12290986 2.2485011 1.972138111.7 5.00.15 RATE 2.9232390 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.050 0.034 112 2.94 0.035 0 54510.5020080327_0022-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Feb 14, 19:51 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org