IOTA/IOTA-ES occultation update for (269) Justitia / TYC 4992-00231-1 event on 2009 May 09, 22:18 UT Visible from Summary ------- On 2009 May 09 UT, the 54 km diameter asteroid (269) Justitia will occult a 11.7 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 1.0 mag to 12.2 mag (the magnitude of the asteroid) for at most 6.5 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: . The event at a glimpse ---------------------- * Rank: 38 * date and approx. time of event: 2009 May 09, 22:08 - 2009 May 09, 22:28 UT * magnitude of target star: 11.7 * magnitude drop [mag]: 1.0 * estimated maximum duration [s]: 6.5 * Moon: 99 % sunlit, 23° distance * Sun: 166° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 68 * 1 sigma uncertainty interval [path widths]: +/- 1.75 * 1 sigma uncertainty interval [seconds]: +/- 10.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .093 +/- .108) * 1 sigma uncertainty ellipse (major, minor, PA): ( .108", .093", 1° ) * approx speed of asteroid's shadow [km/s]: 8.2011 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 4992-00231-1 by 269 Justitia on 2009 May 9 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 - 41 0 0 54 51 2 22 28 16 14 123 0 55 10 55 54 31 14 56 21 17 53 22 40 - 40 0 0 54 37 32 22 28 13 15 123 -1 54 57 28 54 17 41 56 8 0 53 8 58 - 39 0 0 54 23 44 22 28 10 16 124 -1 54 43 43 54 3 51 55 54 25 52 54 58 - 38 0 0 54 9 38 22 28 7 16 125 -2 54 29 39 53 49 42 55 40 32 52 40 40 - 37 0 0 53 55 14 22 28 4 17 126 -3 54 15 18 53 35 16 55 26 21 52 26 5 - 36 0 0 53 40 32 22 28 1 17 127 -3 54 0 39 53 20 31 55 11 51 52 11 11 - 35 0 0 53 25 32 22 27 58 18 128 -4 53 45 42 53 5 29 54 57 4 51 56 0 - 34 0 0 53 10 15 22 27 54 19 128 -5 53 30 27 52 50 8 54 41 59 51 40 30 - 33 0 0 52 54 39 22 27 50 19 129 -5 53 14 54 52 34 30 54 26 35 51 24 43 - 32 0 0 52 38 45 22 27 47 20 130 -6 52 59 3 52 18 34 54 10 54 51 8 38 - 31 0 0 52 22 34 22 27 43 21 131 -6 52 42 54 52 2 20 53 54 54 50 52 16 - 30 0 0 52 6 5 22 27 39 21 132 -7 52 26 27 51 45 48 53 38 37 50 35 36 - 29 0 0 51 49 18 22 27 35 22 133 -8 52 9 43 51 28 59 53 22 1 50 18 38 - 28 0 0 51 32 13 22 27 30 23 134 -8 51 52 41 51 11 52 53 5 8 50 1 23 - 27 0 0 51 14 51 22 27 26 23 134 -9 51 35 21 50 54 28 52 47 57 49 43 51 - 26 0 0 50 57 12 22 27 21 24 135 -10 51 17 44 50 36 46 52 30 29 49 26 2 - 25 0 0 50 39 15 22 27 16 24 136 -10 50 59 50 50 18 47 52 12 42 49 7 56 - 24 0 0 50 21 2 22 27 11 25 137 -11 50 41 38 50 0 31 51 54 39 48 49 32 - 23 0 0 50 2 31 22 27 6 26 138 -12 50 23 10 49 41 58 51 36 18 48 30 53 - 22 0 0 49 43 44 22 27 1 26 139 -12 50 4 24 49 23 9 51 17 40 48 11 56 - 21 0 0 49 24 39 22 26 55 27 140 -13 49 45 22 49 4 3 50 58 45 47 52 44 - 20 0 0 49 5 19 22 26 50 28 141 -14 49 26 4 48 44 41 50 39 33 47 33 15 - 19 0 0 48 45 42 22 26 44 28 141 -14 49 6 29 48 25 2 50 20 5 47 13 31 - 18 0 0 48 25 50 22 26 38 29 142 -15 48 46 38 48 5 8 50 0 20 46 53 31 - 17 0 0 48 5 41 22 26 32 30 143 -16 48 26 31 47 44 58 49 40 20 46 33 15 - 16 0 0 47 45 17 22 26 26 30 144 -16 48 6 9 47 24 33 49 20 3 46 12 45 - 15 0 0 47 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23 8 262 -12 15 25 25 14 48 27 16 30 52 13 44 27 100 0 0 15 9 1 22 8 21 7 262 -11 15 27 33 14 50 33 16 33 2 13 46 32 101 0 0 15 11 37 22 8 19 6 262 -10 15 30 10 14 53 9 16 35 42 .. .. .. 102 0 0 15 14 42 22 8 18 5 263 -9 15 33 16 14 56 13 16 38 51 .. .. .. 103 0 0 15 18 16 22 8 16 4 263 -8 15 36 51 14 59 46 16 42 29 .. .. .. 104 0 0 15 22 20 22 8 15 3 263 -7 15 40 55 15 3 49 16 46 37 .. .. .. 105 0 0 15 26 52 22 8 14 2 263 -6 15 45 29 15 8 20 16 51 14 .. .. .. 106 0 0 15 31 54 22 8 14 1 264 -6 15 50 32 15 13 21 16 56 21 .. .. .. 107 0 0 15 37 25 22 8 14 0 264 -5 15 56 4 15 18 51 17 1 58 .. .. .. Uncertainty in time = +/- 12 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 4992-00231-1 * constellation : Virgo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 14 35 12.8054 DE: -05 36 28.546 * position source: mpos:TYC pm:TYC * standard error: RA,DE ["]: ( .085, .106 ) * V mag [mag]: 11.7 * B mag [mag]: 11.8 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (269) Justitia approx. diameter [km]: 54 approx. diameter ["]: .061 distance from Earth [AU]: 1.22700 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 898 number of rejected observations: 122 time covered by the observations: 1916 May 12 - 2008 Feb 10 1 sigma uncertainty ellipse (major, minor, PA): 0.038, 0.025, 104° remarks: * orbital elements for (269) Justitia : Mean anomaly = 324.13004419 deg Arg. of pericenter = 120.22451006 deg Long. of node = 156.79012520 deg Inclination = 5.47960621 deg Eccentricity = 0.21215527 Semimajor axis = 2.61671068 AU Perihelion dist = 2.06156173 AU Mag: H = 9.52, G = 0.15 Epoch of elements : MJD 54960.93000000 TDT (2009 May 09.930) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 May 9 269 Justitia 22h 18.5m UT 11.7 14 35 12.805- 5 36 28.55TYC 4992-00231-1 11.8 12.2 54 6.5 1.227 -2.063 12.29 16.3140 -5.610 -155.52 17.58 22.3087 0.22493 0.56417 -4.29904 1.71618 0.00070 -0.00110 2000 323.9134962009 5 9.00000120.224510156.790125 5.4796060.21215527 2.6167107 2.0615617 9.5 5.00.15 RATE 2.3284700 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.108 0.093 1 2.75 0.106 0 54545.5020090509_0231-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 08:06 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org