IOTA/IOTA-ES occultation update for (3995) Sakaino / HIP 6537 event on 2009 Oct 10, 09:48 UT Visible from Summary ------- On 2009 Oct 10 UT, the 11 km diameter asteroid (3995) Sakaino will occult a 3.6 mag star in the constellation Cetus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 11.9 mag to 15.5 mag (the magnitude of the asteroid) for at most 1.1 seconds. This update is based on historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: . The event at a glimpse ---------------------- * Rank: 11 * date and approx. time of event: 2009 Oct 10, 09:37 - 2009 Oct 10, 09:59 UT * magnitude of target star: 3.6 * magnitude drop [mag]: 11.9 * estimated maximum duration [s]: 1.1 * Moon: 61 % sunlit, 79° distance * Sun: 164° distance * rough path description: Additional comments ------------------- Wide double star The occultation path -------------------- * approximate projected width [km]: 11 * 1 sigma uncertainty interval [path widths]: +/- 6.32 * 1 sigma uncertainty interval [seconds]: +/- 16.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .143 +/- .090) * 1 sigma uncertainty ellipse (major, minor, PA): ( .154", .068", 65° ) * approx speed of asteroid's shadow [km/s]: 9.6796 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 6537 by 3995 Sakaino on 2009 Oct 10 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 121 0 0 -25 42 3 9 59 2 2 98 -1 -25 39 2 -25 45 5 -25 0 48 -26 23 21 122 0 0 -25 49 39 9 59 1 3 97 -2 -25 46 37 -25 52 40 -25 8 25 -26 30 55 123 0 0 -25 56 54 9 59 1 4 97 -2 -25 53 53 -25 59 55 -25 15 43 -26 38 8 124 0 0 -26 3 50 9 59 0 5 97 -3 -26 0 49 -26 6 51 -25 22 40 -26 45 2 125 0 0 -26 10 25 9 58 59 6 96 -4 -26 7 24 -26 13 26 -25 29 18 -26 51 36 126 0 0 -26 16 41 9 58 58 7 96 -5 -26 13 40 -26 19 42 -25 35 35 -26 57 50 127 0 0 -26 22 37 9 58 56 8 95 -6 -26 19 36 -26 25 38 -25 41 32 -27 3 44 128 0 0 -26 28 13 9 58 55 9 95 -7 -26 25 12 -26 31 13 -25 47 10 -27 9 19 129 0 0 -26 33 29 9 58 53 10 94 -8 -26 30 28 -26 36 29 -25 52 27 -27 14 33 130 0 0 -26 38 25 9 58 51 10 94 -8 -26 35 24 -26 41 25 -25 57 25 -27 19 28 131 0 0 -26 43 1 9 58 49 11 93 -9 -26 40 1 -26 46 2 -26 2 2 -27 24 3 132 0 0 -26 47 18 9 58 47 12 93 -10 -26 44 18 -26 50 18 -26 6 20 -27 28 19 133 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47 9 38 5 23 258 -20 8 9 53 8 3 41 8 49 3 7 24 28 - 76 0 0 8 22 23 9 38 0 22 258 -19 8 25 29 8 19 18 9 4 37 7 40 7 - 75 0 0 8 37 43 9 37 56 21 258 -18 8 40 49 8 34 38 9 19 54 7 55 30 - 74 0 0 8 52 47 9 37 52 20 258 -17 8 55 52 8 49 41 9 34 54 8 10 36 - 73 0 0 9 7 33 9 37 48 19 258 -16 9 10 38 9 4 28 9 49 38 8 25 25 - 72 0 0 9 22 2 9 37 45 18 258 -15 9 25 7 9 18 57 10 4 4 8 39 56 - 71 0 0 9 36 13 9 37 41 17 258 -14 9 39 18 9 33 9 10 18 13 8 54 11 - 70 0 0 9 50 7 9 37 38 16 259 -13 9 53 12 9 47 3 10 32 4 9 8 7 - 69 0 0 10 3 43 9 37 35 15 259 -12 10 6 47 10 0 39 10 45 37 9 21 46 - 68 0 0 10 17 1 9 37 32 14 259 -11 10 20 5 10 13 57 10 58 52 9 35 6 - 67 0 0 10 30 0 9 37 29 13 259 -10 10 33 4 10 26 56 11 11 49 9 48 8 - 66 0 0 10 42 41 9 37 27 12 259 -9 10 45 45 10 39 37 11 24 27 10 0 52 - 65 0 0 10 55 3 9 37 25 11 259 -9 10 58 7 10 52 0 11 36 47 10 13 16 - 64 0 0 11 7 6 9 37 23 10 260 -8 11 10 10 11 4 3 11 48 48 10 25 22 - 63 0 0 11 18 51 9 37 21 9 260 -7 11 21 54 11 15 47 12 0 29 10 37 9 - 62 0 0 11 30 15 9 37 19 8 260 -6 11 33 18 11 27 12 12 11 52 10 48 36 - 61 0 0 11 41 21 9 37 18 7 260 -5 11 44 24 11 38 18 12 22 55 10 59 44 - 60 0 0 11 52 6 9 37 16 6 260 -4 11 55 9 11 49 4 12 33 38 11 10 32 - 59 0 0 12 2 32 9 37 15 5 261 -3 12 5 35 11 59 30 12 44 2 11 21 0 - 58 0 0 12 12 38 9 37 15 4 261 -2 12 15 41 12 9 36 12 54 5 11 31 8 - 57 0 0 12 22 24 9 37 14 3 261 -1 12 25 27 12 19 22 13 3 49 11 40 57 Uncertainty in time = +/- 16 secs [Prediction of 2008 Nov 16.0] Data for the target star ------------------------ * name: HIP 6537 * constellation : Cetus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 01 24 01.3542 DE: -08 11 01.747 * position source: mpos:HIP2 pm:HIP2 plx:HIP2 * standard error: RA,DE ["]: ( .003, .002 ) * V mag [mag]: 3.6 * B mag [mag]: 4.7 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (3995) Sakaino approx. diameter [km]: 11 approx. diameter ["]: .011 distance from Earth [AU]: 1.41200 * orbital information: orbit source: Preston date of fit: 2008 Apr 25 source of used astrometry: MPC (via Astdys) number of used observations: 604 number of rejected observations: 18 time covered by the observations: 1978 May 06 - 2008 Feb 09 1 sigma uncertainty ellipse (major, minor, PA): 0.154, 0.068, 65° remarks: * orbital elements for (3995) Sakaino : Mean anomaly = 1.00043079 deg Arg. of pericenter = 275.34347541 deg Long. of node = 99.95294021 deg Inclination = 9.30672261 deg Eccentricity = 0.09352290 Semimajor axis = 2.63481577 AU Perihelion dist = 2.38840015 AU Mag: H = 11.94, G = 0.15 Epoch of elements : MJD 55114.40900000 TDT (2009 Oct 10.409) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Oct 10 3995 Sakaino 9h 48.1m UT 3.6 1 24 1.354- 8 11 1.75HIP 6537 4.7 15.5 11 1.1 1.412 -2.165 -11.16 -145.1631 -8.181 29.72 -6.77 9.8022 0.03608 -0.10376 -5.16077 -1.79320 -0.00054 0.00142 2000 359.984372200910 6.00000275.343475 99.952940 9.3067230.09352290 2.6348158 2.388400212.4 5.00.15 RATE 2.3045110 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.154 0.068 65 7.32 0.068 0 54786.5020091010___6537 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 16, 16:57 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org