IOTA/IOTA-ES occultation update for (161) Athor / TYC 4953-00029-1 event on 2008 Mar 25, 15:16 UT Visible from N Australia Summary ------- On 2008 Mar 25 UT, the 44 km diameter asteroid (161) Athor will occult a 11.5 mag star in the constellation Virgo for observers along a path across N Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.3 mag to 12.4 mag (the magnitude of the asteroid) for at most 3.7 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: 85 * date and approx. time of event: 2008 Mar 25, 15:07 - 2008 Mar 25, 15:24 UT * midpoint of event [JD]: 2454551.13628333 * magnitude of target star: 11.5 * magnitude drop [mag]: 1.3 * estimated maximum duration [s]: 3.7 * Moon: 86 % sunlit, 36° distance * Sun: 172° distance * rough path description: N Australia The occultation path -------------------- * approximate projected width [km]: 45 * 1 sigma uncertainty interval [path widths]: +/- 0.60 * 1 sigma uncertainty interval [seconds]: +/- 3.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .031 +/- .025) * 1 sigma uncertainty ellipse (major, minor, PA): ( .032", .024", 109° ) * approx speed of asteroid's shadow [km/s]: 11.9226 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 4953-00029-1 by 161 Athor on 2008 Mar 25 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 49 0 0 - 2 17 23 15 24 57 1 93 -9 - 2 5 9 - 2 29 37 - 1 50 29 - 2 44 19 50 0 0 - 2 20 48 15 24 57 2 93 -10 - 2 8 34 - 2 33 2 - 1 53 54 - 2 47 44 51 0 0 - 2 24 24 15 24 57 3 93 -11 - 2 12 10 - 2 36 39 - 1 57 30 - 2 51 21 52 0 0 - 2 28 11 15 24 56 4 93 -12 - 2 15 57 - 2 40 26 - 2 1 17 - 2 55 9 53 0 0 - 2 32 10 15 24 55 5 93 -13 - 2 19 55 - 2 44 25 - 2 5 15 - 2 59 7 54 0 0 - 2 36 19 15 24 55 6 93 -14 - 2 24 5 - 2 48 34 - 2 9 24 - 3 3 17 55 0 0 - 2 40 39 15 24 53 7 93 -15 - 2 28 24 - 2 52 54 - 2 13 44 - 3 7 37 56 0 0 - 2 45 10 15 24 52 8 93 -16 - 2 32 55 - 2 57 25 - 2 18 14 - 3 12 8 57 0 0 - 2 49 51 15 24 51 9 93 -17 - 2 37 36 - 3 2 7 - 2 22 55 - 3 16 50 58 0 0 - 2 54 43 15 24 49 10 93 -18 - 2 42 28 - 3 6 59 - 2 27 47 - 3 21 42 59 0 0 - 2 59 45 15 24 48 11 92 -19 - 2 47 30 - 3 12 1 - 2 32 49 - 3 26 45 60 0 0 - 3 4 58 15 24 46 12 92 -20 - 2 52 42 - 3 17 14 - 2 38 1 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0 -23 3 39 15 7 46 13 272 -5 -22 51 26 -23 15 51 -22 36 48 -23 30 32 -139 0 0 -23 2 53 15 7 44 12 272 -4 -22 50 40 -23 15 6 -22 36 2 -23 29 46 -138 0 0 -23 1 56 15 7 42 11 271 -3 -22 49 44 -23 14 9 -22 35 6 -23 28 49 -137 0 0 -23 0 49 15 7 41 10 271 -2 -22 48 36 -23 13 2 -22 33 58 -23 27 42 -136 0 0 -22 59 30 15 7 39 9 271 -1 -22 47 18 -23 11 43 -22 32 40 -23 26 24 -135 0 0 -22 58 1 15 7 38 8 270 0 -22 45 49 -23 10 14 -22 31 11 -23 24 55 Uncertainty in time = +/- 3 secs [Prediction of 2008 Feb 14.0] Data for the target star ------------------------ * name: TYC 4953-00029-1 * constellation : Virgo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 12 50 56.2675 DE: -02 55 52.333 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .019 ) * V mag [mag]: 11.5 * B mag [mag]: 12.1 * Apparent position with proper motion RA(deg): 192.8478426286 DE(deg): -2.9795970013 * Equation of equinoxes (radians) : 0.000040654268347 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (161) Athor approx. diameter [km]: 44 approx. diameter ["]: .040 distance from Earth [AU]: 1.53400 * orbital information: orbit source: Preston date of fit: 2008 Feb 13 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 695 number of rejected observations: 115 time covered by the observations: 1917 Aug 08 - 2008 Feb 09 1 sigma uncertainty ellipse (major, minor, PA): 0.025, 0.015, 122° remarks: * orbital elements for (161) Athor : Mean anomaly = 250.48067534 deg Arg. of pericenter = 294.43645092 deg Long. of node = 18.76950049 deg Inclination = 9.05403919 deg Eccentricity = 0.13787769 Semimajor axis = 2.37878361 AU Perihelion dist = 2.05080242 AU Mag: H = 9.02, G = 0.13 Epoch of elements : MJD 54550.63700000 TDT (2008 Mar 25.637) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Mar 25 161 Athor 15h 16.2m UT 11.5 12 50 56.268- 2 55 52.33TYC 4953-00029-1 12.1 12.4 44 3.7 1.534 -2.536 6.80 140.2191 -2.933 -47.60 2.13 15.2708 -0.03756 -0.21089 -6.62428 1.18518 -0.00080 0.00009 2000 250.3095512008 325.00000294.436451 18.769500 9.0540390.13787769 2.3787836 2.0508024 9.2 5.00.13 RATE 2.6864060 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.032 0.024 109 1.60 0.024 0 54510.5020080325_0029-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Feb 14, 19:37 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org