IOTA/IOTA-ES occultation update for (7596) Yumi / TYC 6182-01155-1 event on 2009 May 06, 17:32 UT Visible from Summary ------- On 2009 May 06 UT, the 17 km diameter asteroid (7596) Yumi will occult a 10.4 mag star in the constellation Libra for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.1 mag to 15.5 mag (the magnitude of the asteroid) for at most 1.3 seconds. This update is based on historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 8 * date and approx. time of event: 2009 May 06, 17:23 - 2009 May 06, 17:41 UT * magnitude of target star: 10.4 * magnitude drop [mag]: 5.1 * estimated maximum duration [s]: 1.3 * Moon: 94 % sunlit, 36° distance * Sun: 172° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 17 * 1 sigma uncertainty interval [path widths]: +/- 7.91 * 1 sigma uncertainty interval [seconds]: +/- 14.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .144 +/- .093) * 1 sigma uncertainty ellipse (major, minor, PA): ( .156", .071", 115° ) * approx speed of asteroid's shadow [km/s]: 12.3654 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6182-01155-1 by 7596 Yumi on 2009 May 6 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 10 0 0 - 0 3 20 17 41 4 0 112 -6 0 1 39 - 0 8 19 .. .. .. - 1 27 9 11 0 0 - 0 27 56 17 41 4 1 112 -7 - 0 22 57 - 0 32 55 0 55 57 - 1 51 43 12 0 0 - 0 52 27 17 41 3 2 112 -8 - 0 47 28 - 0 57 26 0 31 23 - 2 16 12 13 0 0 - 1 16 54 17 41 3 3 112 -9 - 1 11 55 - 1 21 53 0 6 54 - 2 40 37 14 0 0 - 1 41 16 17 41 2 4 112 -10 - 1 36 17 - 1 46 14 - 0 17 30 - 3 4 56 15 0 0 - 2 5 32 17 41 1 6 112 -11 - 2 0 33 - 2 10 30 - 0 41 49 - 3 29 9 16 0 0 - 2 29 41 17 41 0 7 112 -12 - 2 24 43 - 2 34 39 - 1 6 1 - 3 53 15 17 0 0 - 2 53 44 17 40 59 8 112 -13 - 2 48 46 - 2 58 42 - 1 30 7 - 4 17 15 18 0 0 - 3 17 39 17 40 58 9 112 -14 - 3 12 41 - 3 22 37 - 1 54 6 - 4 41 6 19 0 0 - 3 41 26 17 40 56 10 112 -15 - 3 36 28 - 3 46 24 - 2 17 56 - 5 4 50 20 0 0 - 4 5 5 17 40 54 11 112 -17 - 4 0 7 - 4 10 2 - 2 41 39 - 5 28 25 21 0 0 - 4 28 34 17 40 52 12 112 -18 - 4 23 37 - 4 33 32 - 3 5 13 - 5 51 50 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- 0 50 34 - 3 37 45 -179 0 0 - 1 50 7 17 24 5 13 248 -7 - 1 45 9 - 1 55 5 - 0 26 26 - 3 13 42 -178 0 0 - 1 25 55 17 24 3 12 248 -6 - 1 20 57 - 1 30 54 - 0 2 12 - 2 49 33 -177 0 0 - 1 1 39 17 24 1 11 248 -5 - 0 56 40 - 1 6 37 0 22 7 - 2 25 19 -176 0 0 - 0 37 17 17 24 0 10 248 -4 - 0 32 18 - 0 42 16 0 46 31 - 2 0 59 -175 0 0 - 0 12 51 17 23 58 9 248 -3 - 0 7 52 - 0 17 50 1 10 59 - 1 36 35 -174 0 0 0 11 38 17 23 57 7 248 -2 0 16 37 0 6 39 1 35 30 - 1 12 8 -173 0 0 0 36 11 17 23 56 6 248 -1 0 41 10 0 31 12 2 0 4 - 0 47 36 Uncertainty in time = +/- 18 secs [Prediction of 2008 Apr 25.0] Data for the target star ------------------------ * name: TYC 6182-01155-1 * constellation : Libra * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 15 18 47.7018 DE: -22 08 50.184 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .031 ) * V mag [mag]: 10.4 * B mag [mag]: 11.1 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (7596) Yumi approx. diameter [km]: 17 approx. diameter ["]: .012 distance from Earth [AU]: 1.91600 * orbital information: orbit source: Preston date of fit: 2008 Apr 24 source of used astrometry: MPC (via Astdys) number of used observations: 701 number of rejected observations: 13 time covered by the observations: 1948 Nov 03 - 2008 Mar 14 1 sigma uncertainty ellipse (major, minor, PA): 0.154, 0.065, 116° remarks: * orbital elements for (7596) Yumi : Mean anomaly = 297.46533923 deg Arg. of pericenter = 263.63987313 deg Long. of node = 38.05745901 deg Inclination = 11.00749553 deg Eccentricity = 0.07744769 Semimajor axis = 3.01121219 AU Perihelion dist = 2.77800077 AU Mag: H = 11.66, G = 0.15 Epoch of elements : MJD 54957.73100000 TDT (2009 May 06.731) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 May 6 7596 Yumi 17h 32.5m UT 10.4 15 18 47.702-22 8 50.18TYC 6182-01155-1 11.1 15.5 17 1.3 1.916 -2.305 -0.91 101.8771 -22.147 -83.96 16.72 17.5411 -0.00068 0.02845 -6.97655 -0.19884 -0.00055 0.00053 2000 296.0071032009 429.00000263.639873 38.057459 11.0074960.07744769 3.0112122 2.778000811.5 5.00.15 RATE 1.8862190 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.156 0.071 115 8.91 0.097 0 54581.5020090506_1155-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 25, 06:44 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org