IOTA/IOTA-ES occultation update for (558) Carmen / UCAC2 37178850 event on 2009 Feb 02, 01:22 UT Visible from Summary ------- On 2009 Feb 02 UT, the 59 km diameter asteroid (558) Carmen will occult a 11.6 mag star in the constellation Cancer for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 1.5 mag to 12.8 mag (the magnitude of the asteroid) for at most 4.7 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: 73 * date and approx. time of event: 2009 Feb 02, 01:16 - 2009 Feb 02, 01:28 UT * magnitude of target star: 11.6 * magnitude drop [mag]: 1.5 * estimated maximum duration [s]: 4.7 * Moon: 40 % sunlit, 99° distance * Sun: 176° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 78 * 1 sigma uncertainty interval [path widths]: +/- 0.78 * 1 sigma uncertainty interval [seconds]: +/- 5.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .054 +/- .030) * 1 sigma uncertainty ellipse (major, minor, PA): ( .054", .030", 92° ) * approx speed of asteroid's shadow [km/s]: 12.5084 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 37178850 by 558 Carmen on 2009 Feb 2 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 -105 0 0 -11 56 28 1 28 48 4 74 0 -11 34 43 -12 18 20 -11 1 3 -12 52 41 -104 0 0 -11 43 48 1 28 47 5 73 -1 -11 22 7 -12 5 36 -10 48 32 -12 39 52 -103 0 0 -11 31 51 1 28 46 6 73 -2 -11 10 14 -11 53 36 -10 36 44 -12 27 46 -102 0 0 -11 20 37 1 28 44 7 73 -3 -10 59 3 -11 42 18 -10 25 38 -12 16 23 -101 0 0 -11 10 5 1 28 43 8 73 -4 -10 48 34 -11 31 43 -10 15 14 -12 5 43 -100 0 0 -11 0 15 1 28 41 9 73 -5 -10 38 47 -11 21 51 -10 5 31 -11 55 46 - 99 0 0 -10 51 8 1 28 39 10 72 -6 -10 29 42 -11 12 41 - 9 56 31 -11 46 32 - 98 0 0 -10 42 43 1 28 37 11 72 -7 -10 21 20 -11 4 13 - 9 48 12 -11 38 0 - 97 0 0 -10 35 0 1 28 35 12 72 -8 -10 13 39 -10 56 28 - 9 40 34 -11 30 11 - 96 0 0 -10 27 59 1 28 32 13 72 -9 -10 6 40 -10 49 24 - 9 33 39 -11 23 4 - 95 0 0 -10 21 39 1 28 29 14 72 -10 -10 0 22 -10 43 3 - 9 27 24 -11 16 40 - 94 0 0 -10 16 2 1 28 26 15 71 -11 - 9 54 47 -10 37 24 - 9 21 51 -11 10 58 - 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Uncertainty in time = +/- 6 secs [Prediction of 2008 Nov 6.0] Data for the target star ------------------------ * name: UCAC2 37178850 * constellation : Cancer * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 08 45 57.3225 DE: +15 00 06.113 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .046, .026 ) * V mag [mag]: 11.6 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (558) Carmen approx. diameter [km]: 59 approx. diameter ["]: .045 distance from Earth [AU]: 1.81500 * orbital information: orbit source: Preston date of fit: 2008 Nov 05 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 956 number of rejected observations: 109 time covered by the observations: 1905 Feb 09 - 2008 Feb 29 1 sigma uncertainty ellipse (major, minor, PA): 0.028, 0.014, 97° remarks: * orbital elements for (558) Carmen : Mean anomaly = 28.03739706 deg Arg. of pericenter = 316.54734753 deg Long. of node = 143.86420347 deg Inclination = 8.36573675 deg Eccentricity = 0.04330046 Semimajor axis = 2.90821160 AU Perihelion dist = 2.78228470 AU Mag: H = 8.91, G = 0.15 Epoch of elements : MJD 54864.05700000 TDT (2009 Feb 02.057) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Feb 2 558 Carmen 1h 22.4m UT 11.6 8 45 57.323 15 0 6.11UCAC2 37178850 0.0 12.8 59 4.7 1.815 -2.095 15.78 -21.4903 14.997 162.82 -16.82 1.3735 -0.30185 -0.58044 -6.26413 3.25660 0.00045 0.00018 2000 27.2311462009 129.00000316.547348143.864203 8.3657370.04330046 2.9082116 2.7822847 9.1 5.00.15 RATE 1.9873080 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.054 0.030 92 1.78 0.035 0 54776.5020090202_178850 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 06, 04:44 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org