IOTA/IOTA-ES occultation update for (1331) Solvejg / UCAC2 24863658 event on 2009 Jun 11, 16:26 UT Visible from Summary ------- On 2009 Jun 11 UT, the 32 km diameter asteroid (1331) Solvejg will occult a 11.9 mag star in the constellation Ophiuchus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.1 mag to 13.8 mag (the magnitude of the asteroid) for at most 3.2 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: 35 * date and approx. time of event: 2009 Jun 11, 16:20 - 2009 Jun 11, 16:37 UT * magnitude of target star: 11.9 * magnitude drop [mag]: 2.1 * estimated maximum duration [s]: 3.2 * Moon: 87 % sunlit, 55° distance * Sun: 168° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 40 * 1 sigma uncertainty interval [path widths]: +/- 1.91 * 1 sigma uncertainty interval [seconds]: +/- 7.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .059 +/- .050) * 1 sigma uncertainty ellipse (major, minor, PA): ( .060", .050", 95° ) * approx speed of asteroid's shadow [km/s]: 9.9773 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 24863658 by 1331 Solvejg on 2009 Jun 11 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 37 0 0 33 26 34 16 37 13 12 121 0 33 38 23 33 14 47 34 23 52 32 30 2 38 0 0 33 6 9 16 37 10 13 122 -1 33 17 58 32 54 23 34 3 24 32 9 41 39 0 0 32 45 49 16 37 7 13 122 -2 32 57 37 32 34 3 33 43 0 31 49 24 40 0 0 32 25 34 16 37 4 14 123 -3 32 37 21 32 13 49 33 22 40 31 29 13 41 0 0 32 5 24 16 37 1 15 123 -4 32 17 10 31 53 40 33 2 26 31 9 7 42 0 0 31 45 21 16 36 58 16 124 -5 31 57 6 31 33 37 32 42 19 30 49 8 43 0 0 31 25 23 16 36 54 17 125 -5 31 37 8 31 13 41 32 22 17 30 29 15 44 0 0 31 5 33 16 36 50 18 125 -6 31 17 17 30 53 52 32 2 22 30 9 29 45 0 0 30 45 51 16 36 46 19 126 -7 30 57 33 30 34 10 31 42 35 29 49 51 46 0 0 30 26 16 16 36 42 20 126 -8 30 37 58 30 14 36 31 22 56 29 30 21 47 0 0 30 6 50 16 36 38 20 127 -9 30 18 30 29 55 11 31 3 25 29 11 0 48 0 0 29 47 32 16 36 33 21 128 -10 29 59 12 29 35 55 30 44 2 28 51 47 49 0 0 29 28 25 16 36 29 22 128 -11 29 40 3 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29 5 30 177 0 0 30 21 9 16 20 29 4 246 -10 30 32 52 30 9 28 31 17 56 .. .. .. 178 0 0 30 40 58 16 20 29 3 247 -9 30 52 42 30 29 16 31 37 51 .. .. .. 179 0 0 31 0 56 16 20 28 2 247 -8 31 12 41 30 49 13 31 57 53 .. .. .. 180 0 0 31 21 2 16 20 28 1 248 -7 31 32 48 31 9 18 32 18 4 .. .. .. -179 0 0 31 41 15 16 20 27 0 248 -6 31 53 2 31 29 30 .. .. .. .. .. .. Uncertainty in time = +/- 7 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: UCAC2 24863658 * constellation : Ophiuchus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 16 32 48.2811 DE: -18 13 47.689 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .042, .042 ) * V mag [mag]: 11.9 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1331) Solvejg approx. diameter [km]: 32 approx. diameter ["]: .026 distance from Earth [AU]: 1.69600 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1157 number of rejected observations: 48 time covered by the observations: 1926 Mar 18 - 2008 Feb 12 1 sigma uncertainty ellipse (major, minor, PA): 0.042, 0.026, 100° remarks: * orbital elements for (1331) Solvejg : Mean anomaly = 321.71535169 deg Arg. of pericenter = 186.46528122 deg Long. of node = 121.43100112 deg Inclination = 3.10049547 deg Eccentricity = 0.18750914 Semimajor axis = 3.10174648 AU Perihelion dist = 2.52014067 AU Mag: H = 10.51, G = 0.15 Epoch of elements : MJD 54993.68500000 TDT (2009 Jun 11.685) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jun 11 1331 Solvejg 16h 29.0m UT 11.9 16 32 48.281-18 13 47.69UCAC2 24863658 0.0 13.8 32 3.2 1.696 -2.045 1.70 100.8118 -18.230 -67.31 23.13 16.4829 0.03474 0.59854 -5.62189 0.32873 0.00101 -0.00050 2000 321.0504892009 6 8.00000186.465281121.431001 3.1004950.18750914 3.1017465 2.520140710.1 5.00.15 RATE 1.8042410 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.060 0.050 95 2.91 0.050 0 54545.5020090611_863658 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 09:16 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org