IOTA/IOTA-ES occultation update for (179) Klytaemnestra / TYC 6280-00592-1 event on 2009 Aug 06, 12:24 UT Visible from Summary ------- On 2009 Aug 06 UT, the 78 km diameter asteroid (179) Klytaemnestra will occult a 8.8 mag star in the constellation Scutum for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 3.7 mag to 12.5 mag (the magnitude of the asteroid) for at most 11.3 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: 95 * date and approx. time of event: 2009 Aug 06, 12:08 - 2009 Aug 06, 12:36 UT * magnitude of target star: 8.8 * magnitude drop [mag]: 3.7 * estimated maximum duration [s]: 11.3 * Moon: 100 % sunlit, 39° distance * Sun: 145° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 78 * 1 sigma uncertainty interval [path widths]: +/- 0.44 * 1 sigma uncertainty interval [seconds]: +/- 7.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .036 +/- .025) * 1 sigma uncertainty ellipse (major, minor, PA): ( .037", .025", 82° ) * approx speed of asteroid's shadow [km/s]: 6.8746 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6280-00592-1 by 179 Klytaemnestra on 2009 Aug 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 80 0 0 - 8 33 47 12 36 30 35 103 0 - 8 12 10 - 8 55 24 - 7 53 8 - 9 14 26 81 0 0 - 8 46 1 12 36 21 36 103 -1 - 8 24 25 - 9 7 38 - 8 5 24 - 9 26 38 82 0 0 - 8 58 3 12 36 12 36 103 -2 - 8 36 28 - 9 19 39 - 8 17 27 - 9 38 38 83 0 0 - 9 9 53 12 36 2 37 103 -3 - 8 48 19 - 9 31 28 - 8 29 19 - 9 50 27 84 0 0 - 9 21 31 12 35 53 38 103 -4 - 8 59 57 - 9 43 5 - 8 40 58 -10 2 3 85 0 0 - 9 32 57 12 35 43 39 103 -5 - 9 11 24 - 9 54 30 - 8 52 26 -10 13 27 86 0 0 - 9 44 10 12 35 33 40 102 -6 - 9 22 38 -10 5 42 - 9 3 40 -10 24 39 87 0 0 - 9 55 11 12 35 23 41 102 -7 - 9 33 39 -10 16 42 - 9 14 43 -10 35 38 88 0 0 -10 5 59 12 35 12 42 102 -8 - 9 44 28 -10 27 29 - 9 25 32 -10 46 25 89 0 0 -10 16 34 12 35 2 43 102 -9 - 9 55 5 -10 38 4 - 9 36 9 -10 56 59 90 0 0 -10 26 57 12 34 51 44 102 -10 -10 5 28 -10 48 26 - 9 46 33 -11 7 20 91 0 0 -10 37 7 12 34 40 45 102 -11 -10 15 38 -10 58 35 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59 1 - 7 20 43 -163 0 0 - 6 26 2 12 11 17 36 255 -69 - 6 4 17 - 6 47 46 - 5 45 9 - 7 6 53 -162 0 0 - 6 12 1 12 11 8 35 255 -68 - 5 50 16 - 6 33 46 - 5 31 7 - 6 52 54 -161 0 0 - 5 57 51 12 10 58 34 255 -67 - 5 36 5 - 6 19 37 - 5 16 55 - 6 38 45 -160 0 0 - 5 43 32 12 10 50 33 255 -67 - 5 21 45 - 6 5 18 - 5 2 34 - 6 24 27 -159 0 0 - 5 29 3 12 10 41 32 255 -66 - 5 7 15 - 5 50 50 - 4 48 5 - 6 10 0 -158 0 0 - 5 14 26 12 10 33 31 255 -65 - 4 52 37 - 5 36 14 - 4 33 26 - 5 55 24 -157 0 0 - 4 59 40 12 10 24 30 255 -64 - 4 37 51 - 5 21 28 - 4 18 38 - 5 40 40 -156 0 0 - 4 44 45 12 10 16 29 255 -63 - 4 22 56 - 5 6 35 - 4 3 43 - 5 25 47 -155 0 0 - 4 29 43 12 10 9 28 255 -62 - 4 7 52 - 4 51 33 - 3 48 39 - 5 10 45 -154 0 0 - 4 14 32 12 10 1 27 255 -61 - 3 52 41 - 4 36 23 - 3 33 27 - 4 55 36 -153 0 0 - 3 59 14 12 9 54 26 254 -60 - 3 37 22 - 4 21 5 - 3 18 8 - 4 40 19 -152 0 0 - 3 43 48 12 9 47 25 254 -59 - 3 21 56 - 4 5 40 - 3 2 41 - 4 24 55 -151 0 0 - 3 28 16 12 9 40 24 254 -58 - 3 6 23 - 3 50 8 - 2 47 7 - 4 9 23 -150 0 0 - 3 12 36 12 9 34 23 254 -57 - 2 50 42 - 3 34 29 - 2 31 26 - 3 53 44 -149 0 0 - 2 56 50 12 9 27 22 254 -56 - 2 34 55 - 3 18 43 - 2 15 39 - 3 37 59 -148 0 0 - 2 40 57 12 9 21 21 254 -55 - 2 19 2 - 3 2 51 - 1 59 45 - 3 22 7 -147 0 0 - 2 24 58 12 9 16 20 254 -54 - 2 3 3 - 2 46 53 - 1 43 45 - 3 6 10 -146 0 0 - 2 8 53 12 9 10 19 254 -53 - 1 46 57 - 2 30 49 - 1 27 39 - 2 50 6 -145 0 0 - 1 52 43 12 9 5 18 254 -52 - 1 30 47 - 2 14 39 - 1 11 28 - 2 33 56 -144 0 0 - 1 36 27 12 9 0 17 254 -51 - 1 14 31 - 1 58 24 - 0 55 12 - 2 17 42 -143 0 0 - 1 20 7 12 8 55 16 254 -50 - 0 58 10 - 1 42 4 - 0 38 50 - 2 1 22 -142 0 0 - 1 3 42 12 8 51 15 254 -49 - 0 41 44 - 1 25 39 - 0 22 25 - 1 44 58 -141 0 0 - 0 47 12 12 8 47 14 254 -48 - 0 25 15 - 1 9 10 - 0 5 54 - 1 28 29 -140 0 0 - 0 30 39 12 8 43 13 254 -47 - 0 8 41 - 0 52 37 0 10 40 - 1 11 56 -139 0 0 - 0 14 2 12 8 39 12 254 -46 0 7 57 - 0 36 0 0 27 18 - 0 55 20 -138 0 0 0 2 39 12 8 36 11 254 -45 0 24 38 - 0 19 20 0 43 59 - 0 38 40 -137 0 0 0 19 22 12 8 33 10 254 -44 0 41 22 - 0 2 36 1 0 43 - 0 21 57 -136 0 0 0 36 9 12 8 30 9 254 -43 0 58 8 0 14 10 1 17 30 - 0 5 11 -135 0 0 0 52 58 12 8 28 8 254 -42 1 14 57 0 30 58 1 34 19 0 11 37 -134 0 0 1 9 48 12 8 26 7 254 -41 1 31 48 0 47 49 1 51 10 0 28 28 -133 0 0 1 26 41 12 8 24 6 254 -40 1 48 41 1 4 41 2 8 3 0 45 20 -132 0 0 1 43 35 12 8 22 5 254 -39 2 5 35 1 21 35 2 24 57 1 2 14 -131 0 0 2 0 30 12 8 21 4 254 -38 2 22 30 1 38 30 2 41 52 1 19 9 -130 0 0 2 17 26 12 8 20 3 254 -37 2 39 26 1 55 26 2 58 48 1 36 4 -129 0 0 2 34 22 12 8 19 2 254 -36 2 56 22 2 12 22 3 15 44 1 53 0 -128 0 0 2 51 18 12 8 19 1 254 -35 3 13 18 2 29 18 3 32 40 2 9 56 Uncertainty in time = +/- 7 secs [Prediction of 2008 Apr 25.0] Data for the target star ------------------------ * name: TYC 6280-00592-1 * constellation : Scutum * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 42 09.9294 DE: -15 39 41.989 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .020 ) * V mag [mag]: 8.8 * B mag [mag]: 10.6 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (179) Klytaemnestra approx. diameter [km]: 78 approx. diameter ["]: .057 distance from Earth [AU]: 1.89700 * orbital information: orbit source: Preston date of fit: 2008 Apr 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 708 number of rejected observations: 109 time covered by the observations: 1908 Dec 02 - 2008 Feb 01 1 sigma uncertainty ellipse (major, minor, PA): 0.030, 0.015, 78° remarks: * orbital elements for (179) Klytaemnestra : Mean anomaly = 306.87048123 deg Arg. of pericenter = 104.80694488 deg Long. of node = 252.10812151 deg Inclination = 7.81392677 deg Eccentricity = 0.11619693 Semimajor axis = 2.97161272 AU Perihelion dist = 2.62632046 AU Mag: H = 8.06, G = 0.15 Epoch of elements : MJD 55049.51700000 TDT (2009 Aug 06.517) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Aug 6 179 Klytaemnestra 12h 23.8m UT 8.8 18 42 9.929-15 39 41.99TYC 6280-00592-1 10.6 12.5 78 11.3 1.897 -1.243 -0.49 139.4210 -15.661 -4.47 16.57 12.3964 -0.00150 0.02749 -3.87882 -0.10463 0.00312 -0.00037 2000 305.0393652009 728.00000104.806945252.108122 7.8139270.11619693 2.9716127 2.6263204 8.2 5.00.15 RATE 1.9240470 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.037 0.025 82 1.44 0.025 0 54581.5020090806_0592-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 25, 07:51 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org