IOTA/IOTA-ES occultation update for (757) Portlandia / TYC 5551-00367-1 event on 2009 Jul 08, 09:20 UT Visible from Summary ------- On 2009 Jul 08 UT, the 32 km diameter asteroid (757) Portlandia will occult a 11.2 mag star in the constellation Virgo for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 3.9 mag to 15.1 mag (the magnitude of the asteroid) for at most 2.9 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: 52 * date and approx. time of event: 2009 Jul 08, 09:19 - 2009 Jul 08, 09:29 UT * magnitude of target star: 11.2 * magnitude drop [mag]: 3.9 * estimated maximum duration [s]: 2.9 * Moon: 99 % sunlit, 91° distance * Sun: 100° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 34 * 1 sigma uncertainty interval [path widths]: +/- 1.21 * 1 sigma uncertainty interval [seconds]: +/- 4.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .030 +/- .024) * 1 sigma uncertainty ellipse (major, minor, PA): ( .030", .024", 100° ) * approx speed of asteroid's shadow [km/s]: 11.1168 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5551-00367-1 by 757 Portlandia on 2009 Jul 8 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 119 0 0 -28 8 47 9 19 3 68 53 0 -28 19 30 -27 58 5 -28 45 30 -27 32 14 120 0 0 -28 40 4 9 19 13 69 50 -1 -28 50 46 -28 29 23 -29 16 44 -28 3 34 121 0 0 -29 11 2 9 19 23 69 47 -2 -29 21 44 -29 0 22 -29 47 39 -28 34 35 122 0 0 -29 41 41 9 19 34 69 44 -3 -29 52 21 -29 31 2 -30 18 14 -29 5 17 123 0 0 -30 11 59 9 19 44 70 41 -4 -30 22 39 -30 1 21 -30 48 29 -29 35 40 124 0 0 -30 41 57 9 19 54 70 38 -5 -30 52 35 -30 31 20 -31 18 22 -30 5 41 125 0 0 -31 11 33 9 20 5 70 34 -6 -31 22 10 -31 0 57 -31 47 54 -30 35 21 126 0 0 -31 40 47 9 20 15 70 31 -7 -31 51 22 -31 30 12 -32 17 3 -31 4 39 127 0 0 -32 9 38 9 20 25 70 28 -8 -32 20 12 -31 59 4 -32 45 50 -31 33 35 128 0 0 -32 38 6 9 20 35 70 24 -9 -32 48 38 -32 27 34 -33 14 13 -32 2 7 129 0 0 -33 6 9 9 20 45 70 21 -10 -33 16 41 -32 55 39 -33 42 12 -32 30 16 130 0 0 -33 33 49 9 20 55 70 18 -11 -33 44 19 -33 23 20 -34 9 46 -32 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42 1 -123 0 0 -43 0 8 9 29 21 0 251 -65 -43 9 55 -42 50 22 -43 33 37 -42 26 47 Uncertainty in time = +/- 4 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 5551-00367-1 * constellation : Virgo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 13 30 54.6710 DE: -14 03 28.036 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .025, .022 ) * V mag [mag]: 11.2 * B mag [mag]: 12.1 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (757) Portlandia approx. diameter [km]: 32 approx. diameter ["]: .020 distance from Earth [AU]: 2.24200 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 828 number of rejected observations: 68 time covered by the observations: 1917 Feb 14 - 2008 Feb 12 1 sigma uncertainty ellipse (major, minor, PA): 0.017, 0.011, 122° remarks: * orbital elements for (757) Portlandia : Mean anomaly = 158.07845747 deg Arg. of pericenter = 44.18072946 deg Long. of node = 22.56461209 deg Inclination = 8.16751428 deg Eccentricity = 0.10976736 Semimajor axis = 2.37234029 AU Perihelion dist = 2.11193475 AU Mag: H = 10.00, G = 0.15 Epoch of elements : MJD 55020.38900000 TDT (2009 Jul 08.389) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jul 8 757 Portlandia 9h 20.4m UT 11.2 13 30 54.671-14 3 28.04TYC 5551-00367-1 12.1 15.1 32 2.9 2.242 1.539 -10.23 136.1717 -14.055 41.19 22.44 9.3394 -0.14170 -0.30717 5.70711 -2.60766 0.00502 -0.00191 2000 157.9735302009 7 8.00000 44.180729 22.564612 8.1675140.10976736 2.3723403 2.111934810.2 5.00.15 RATE 2.6973580 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.030 0.024 100 2.21 0.024 0 54545.5020090708_0367-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 10:31 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org