IOTA/IOTA-ES occultation update for (1327) Namaqua / TYC 6903-00879-1 event on 2008 Jul 11, 01:55 UT Visible from Africa, Uruguay, Argentina, Chile Summary ------- On 2008 Jul 11 UT, the 25 km diameter asteroid (1327) Namaqua will occult a 10.8 mag star in the constellation Sagittarius for observers along a path across Africa, Uruguay, Argentina, Chile. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.3 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: 34 * date and approx. time of event: 2008 Jul 11, 01:43 - 2008 Jul 11, 02:08 UT * magnitude of target star: 10.8 * magnitude drop [mag]: 4.3 * estimated maximum duration [s]: 2.9 * Moon: 59 % sunlit, 85° distance * Sun: 170° distance * rough path description: Africa, Uruguay, Argentina, Chile The occultation path -------------------- * approximate projected width [km]: 25 * 1 sigma uncertainty interval [path widths]: +/- 1.96 * 1 sigma uncertainty interval [seconds]: +/- 7.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .070 +/- .048) * 1 sigma uncertainty ellipse (major, minor, PA): ( .071", .048", 83° ) * approx speed of asteroid's shadow [km/s]: 8.7002 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6903-00879-1 by 1327 Namaqua on 2008 Jul 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 -122 0 0 -18 3 32 2 8 7 1 121 -5 -17 55 39 -18 11 24 -17 24 47 -18 42 15 -121 0 0 -18 36 59 2 8 7 2 120 -7 -18 29 9 -18 44 50 -17 58 23 -19 15 33 -120 0 0 -19 9 50 2 8 6 3 120 -8 -19 2 1 -19 17 39 -18 31 23 -19 48 15 -119 0 0 -19 42 4 2 8 5 4 120 -9 -19 34 18 -19 49 51 -19 3 47 -20 20 21 -118 0 0 -20 13 42 2 8 4 5 119 -10 -20 5 57 -20 21 27 -19 35 33 -20 51 49 -117 0 0 -20 44 42 2 8 3 6 119 -11 -20 36 59 -20 52 26 -20 6 42 -21 22 41 -116 0 0 -21 15 6 2 8 1 7 119 -12 -21 7 24 -21 22 47 -20 37 15 -21 52 55 -115 0 0 -21 44 52 2 7 59 8 118 -13 -21 37 12 -21 52 32 -21 7 10 -22 22 33 -114 0 0 -22 14 1 2 7 57 9 118 -14 -22 6 23 -22 21 39 -21 36 27 -22 51 33 -113 0 0 -22 42 33 2 7 55 10 117 -15 -22 34 57 -22 50 9 -22 5 8 -23 19 56 -112 0 0 -23 10 28 2 7 53 11 117 -16 -23 2 53 -23 18 2 -22 33 11 -23 47 42 -111 0 0 -23 37 45 2 7 50 12 117 -17 -23 30 12 -23 45 18 -23 0 37 -24 14 51 -110 0 0 -24 4 26 2 7 47 13 116 -18 -23 56 55 -24 11 57 -23 27 26 -24 41 24 -109 0 0 -24 30 29 2 7 44 14 116 -19 -24 23 0 -24 37 59 -23 53 38 -25 7 19 -108 0 0 -24 55 56 2 7 41 15 115 -20 -24 48 29 -25 3 24 -24 19 14 -25 32 37 -107 0 0 -25 20 46 2 7 37 16 115 -21 -25 13 20 -25 28 12 -24 44 12 -25 57 20 -106 0 0 -25 45 0 2 7 33 17 115 -22 -25 37 36 -25 52 24 -25 8 34 -26 21 25 -105 0 0 -26 8 37 2 7 30 18 114 -23 -26 1 15 -26 16 0 -25 32 19 -26 44 55 -104 0 0 -26 31 39 2 7 26 19 114 -24 -26 24 18 -26 39 0 -25 55 28 -27 7 48 -103 0 0 -26 54 4 2 7 21 20 113 -25 -26 46 44 -27 1 23 -26 18 1 -27 30 6 -102 0 0 -27 15 53 2 7 17 21 113 -26 -27 8 35 -27 23 11 -26 39 58 -27 51 48 -101 0 0 -27 37 7 2 7 13 22 112 -27 -27 29 51 -27 44 24 -27 1 19 -28 12 55 -100 0 0 -27 57 46 2 7 8 23 112 -27 -27 50 31 -28 5 1 -27 22 5 -28 33 26 - 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0 38 3 1 46 8 37 233 -32 - 0 29 47 - 0 46 18 0 2 37 - 1 18 41 31 0 0 0 3 51 1 45 59 36 233 -31 0 12 7 - 0 4 25 0 44 33 - 0 36 49 32 0 0 0 45 50 1 45 51 34 233 -30 0 54 6 0 37 33 1 26 33 0 5 8 33 0 0 1 27 53 1 45 42 33 233 -29 1 36 10 1 19 36 2 8 38 0 47 10 34 0 0 2 9 59 1 45 34 32 233 -28 2 18 16 2 1 42 2 50 45 1 29 15 35 0 0 2 52 6 1 45 26 31 233 -26 3 0 23 2 43 49 3 32 53 2 11 21 36 0 0 3 34 14 1 45 18 30 233 -25 3 42 31 3 25 56 4 15 1 2 53 28 37 0 0 4 16 20 1 45 11 28 233 -24 4 24 37 4 8 2 4 57 7 3 35 34 38 0 0 4 58 23 1 45 4 27 233 -23 5 6 40 4 50 5 5 39 9 4 17 38 39 0 0 5 40 21 1 44 57 26 234 -22 5 48 38 5 32 4 6 21 7 4 59 37 40 0 0 6 22 14 1 44 50 25 234 -21 6 30 31 6 13 58 7 2 59 5 41 31 41 0 0 7 4 0 1 44 44 24 234 -19 7 12 17 6 55 44 7 44 44 6 23 18 42 0 0 7 45 38 1 44 38 23 234 -18 7 53 54 7 37 21 8 26 19 7 4 58 43 0 0 8 27 5 1 44 32 21 234 -17 8 35 21 8 18 49 9 7 45 7 46 27 44 0 0 9 8 21 1 44 27 20 234 -16 9 16 36 9 0 6 9 48 58 8 27 45 45 0 0 9 49 24 1 44 22 19 234 -15 9 57 39 9 41 9 10 29 59 9 8 51 46 0 0 10 30 13 1 44 17 18 235 -13 10 38 27 10 21 59 11 10 45 9 49 44 47 0 0 11 10 47 1 44 13 17 235 -12 11 19 0 11 2 34 11 51 15 10 30 21 48 0 0 11 51 4 1 44 9 15 235 -11 11 59 17 11 42 52 12 31 29 11 10 42 49 0 0 12 31 3 1 44 5 14 235 -10 12 39 15 12 22 52 13 11 24 11 50 45 50 0 0 13 10 44 1 44 1 13 235 -9 13 18 54 13 2 33 13 50 59 12 30 29 51 0 0 13 50 3 1 43 58 12 236 -8 13 58 13 13 41 53 14 30 14 13 9 54 52 0 0 14 29 1 1 43 55 11 236 -7 14 37 10 14 20 52 15 9 8 13 48 57 53 0 0 15 7 37 1 43 53 10 236 -5 15 15 45 14 59 29 15 47 38 14 27 38 54 0 0 15 45 49 1 43 50 9 236 -4 15 53 55 15 37 42 16 25 44 15 5 55 55 0 0 16 23 36 1 43 48 7 237 -3 16 31 41 16 15 30 17 3 25 15 43 48 56 0 0 17 0 57 1 43 47 6 237 -2 17 9 2 16 52 53 17 40 41 16 21 15 57 0 0 17 37 52 1 43 45 5 237 -1 17 45 55 17 29 49 18 17 29 16 58 16 Uncertainty in time = +/- 8 secs [Prediction of 2008 Jul 2.0] Data for the target star ------------------------ * name: TYC 6903-00879-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 19 54 24.6867 DE: -29 12 56.987 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .023 ) * V mag [mag]: 10.8 * B mag [mag]: 12.4 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1327) Namaqua approx. diameter [km]: 25 approx. diameter ["]: .025 distance from Earth [AU]: 1.37500 * orbital information: orbit source: Preston date of fit: 2008 Jul 02 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 692 number of rejected observations: 15 time covered by the observations: 1934 Aug 04 - 2008 Jun 23 1 sigma uncertainty ellipse (major, minor, PA): 0.067, 0.042, 82° remarks: * orbital elements for (1327) Namaqua : Mean anomaly = 335.68548121 deg Arg. of pericenter = 268.24280518 deg Long. of node = 58.07864888 deg Inclination = 5.81800363 deg Eccentricity = 0.16372515 Semimajor axis = 2.78090321 AU Perihelion dist = 2.32559942 AU Mag: H = 12.01, G = 0.15 Epoch of elements : MJD 54658.08000000 TDT (2008 Jul 11.080) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jul 11 1327 Namaqua 1h 55.9m UT 10.8 19 54 24.687-29 12 56.99TYC 6903-00879-1 12.4 15.1 25 2.9 1.375 -2.230 -11.63 -19.7317 -29.213 152.40 22.07 1.9319 -0.01027 0.02579 -4.56140 -1.81883 -0.00066 0.00065 2000 333.9682192008 7 3.00000268.242805 58.078649 5.8180040.16372515 2.7809032 2.325599412.1 5.00.15 RATE 2.1253240 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.071 0.048 83 2.96 0.049 0 54649.5020080711_0879-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jul 02, 19:22 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org