IOTA/IOTA-ES occultation update for (13) Egeria / TYC 0614-00168-1 event on 2008 Feb 04, 23:25 UT Visible from N Brazil Summary ------- On 2008 Feb 04 UT, the 208 km diameter asteroid (13) Egeria will occult a 11.7 mag star in the constellation Pisces for observers along a path across N Brazil. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.9 mag to 11.9 mag (the magnitude of the asteroid) for at most 7.5 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: 99 * date and approx. time of event: 2008 Feb 04, 23:21 - 2008 Feb 04, 23:28 UT * midpoint of event [JD]: 2454501.47577083 * magnitude of target star: 11.7 * magnitude drop [mag]: 0.9 * estimated maximum duration [s]: 7.5 * Moon: 5 % sunlit, 94° distance * Sun: 68° distance * rough path description: N Brazil The occultation path -------------------- * approximate projected width [km]: 237 * 1 sigma uncertainty interval [path widths]: +/- 0.24 * 1 sigma uncertainty interval [seconds]: +/- 1.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .025 +/- .025) * 1 sigma uncertainty ellipse (major, minor, PA): ( .025", .025", 358° ) * approx speed of asteroid's shadow [km/s]: 27.7669 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0614-00168-1 by 13 Egeria on 2008 Feb 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 -176 0 0 -59 53 49 23 21 46 0 70 46 .. .. .. -58 46 25 .. .. .. .. .. .. -175 0 0 -59 42 54 23 21 46 1 70 46 -60 51 19 -58 35 15 -61 24 27 .. .. .. -174 0 0 -59 31 34 23 21 46 1 69 46 -60 40 15 -58 23 41 -61 13 31 .. .. .. -173 0 0 -59 19 51 23 21 46 2 68 47 -60 28 47 -58 11 42 -61 2 10 -57 39 16 -172 0 0 -59 7 42 23 21 46 2 67 47 -60 16 54 -57 59 18 -60 50 25 -57 26 44 -171 0 0 -58 55 8 23 21 46 3 66 47 -60 4 36 -57 46 28 -60 38 16 -57 13 47 -170 0 0 -58 42 8 23 21 46 3 65 47 -59 51 53 -57 33 12 -60 25 41 -57 0 23 -169 0 0 -58 28 42 23 21 47 4 64 48 -59 38 45 -57 19 29 -60 12 41 -56 46 33 -168 0 0 -58 14 50 23 21 47 5 64 48 -59 25 10 -57 5 20 -59 59 15 -56 32 16 -167 0 0 -58 0 30 23 21 47 5 63 48 -59 11 8 -56 50 43 -59 45 22 -56 17 31 -166 0 0 -57 45 44 23 21 47 6 62 48 -58 56 40 -56 35 39 -59 31 3 -56 2 18 -165 0 0 -57 30 29 23 21 47 6 61 49 -58 41 44 -56 20 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.. .. .. .. 4 54 49 .. .. .. .. .. .. Data for the target star ------------------------ * name: TYC 0614-00168-1 * constellation : Pisces * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 01 26 47.8248 DE: +09 36 17.344 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .024, .025 ) * V mag [mag]: 11.7 * B mag [mag]: 12.2 * Apparent position with proper motion RA(deg): 21.8061923202 DE(deg): 9.6478008491 * Equation of equinoxes (radians) : 0.000046024718682 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (13) Egeria approx. diameter [km]: 208 approx. diameter ["]: .106 distance from Earth [AU]: 2.70900 * orbital information: orbit source: Preston date of fit: 2008 Jan 02 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 1087 number of rejected observations: 134 time covered by the observations: 1904 Nov 15 - 2007 Dec 15 1 sigma uncertainty ellipse (major, minor, PA): 0.008, 0.006, 46° remarks: * orbital elements for (13) Egeria : Mean anomaly = 290.38139975 deg Arg. of pericenter = 80.90536461 deg Long. of node = 43.29066378 deg Inclination = 16.54336695 deg Eccentricity = 0.08585831 Semimajor axis = 2.57602390 AU Perihelion dist = 2.35485083 AU Mag: H = 6.73, G = 0.15 Epoch of elements : MJD 54500.97600000 TDT (2008 Feb 04.976) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Feb 04 13 Egeria 23h 25.1m UT 11.7 1 26 47.825 9 36 17.34TYC 0614-00168-1 12.2 11.9 208 7.5 2.709 2.901 27.34 -104.082 9.597 192.21 -16.18 23.4185 .25627 -.40461 13.21673 8.42272 0.00505 0.00203 2000 290.1487362008 2 4.00000 80.905365 43.290664 16.5433670.085858312.576023902.354850836.745 0.15 RATE 2.3838510 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.025 0.025 357.8 1.240 0.025 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jan 04, 04:41 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org