IOTA/IOTA-ES occultation update for (1394) Algoa / TYC 0014-00517-1 event on 2009 Sep 09, 10:38 UT Visible from Summary ------- On 2009 Sep 09 UT, the 11 km diameter asteroid (1394) Algoa will occult a 10.5 mag star in the constellation Pisces for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.3 mag to 15.8 mag (the magnitude of the asteroid) for at most 1.3 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: 19 * date and approx. time of event: 2009 Sep 09, 10:26 - 2009 Sep 09, 10:51 UT * magnitude of target star: 10.5 * magnitude drop [mag]: 5.3 * estimated maximum duration [s]: 1.3 * Moon: 77 % sunlit, 33° distance * Sun: 155° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 11 * 1 sigma uncertainty interval [path widths]: +/- 3.57 * 1 sigma uncertainty interval [seconds]: +/- 7.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .057 +/- .040) * 1 sigma uncertainty ellipse (major, minor, PA): ( .059", .038", 73° ) * approx speed of asteroid's shadow [km/s]: 8.0433 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0014-00517-1 by 1394 Algoa on 2009 Sep 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 131 0 0 -15 41 26 10 51 21 1 85 -25 -15 38 21 -15 44 31 -15 16 20 .. .. .. 132 0 0 -15 36 13 10 51 21 2 85 -26 -15 33 8 -15 39 18 -15 11 7 .. .. .. 133 0 0 -15 30 30 10 51 20 3 85 -27 -15 27 25 -15 33 35 -15 5 22 -15 55 35 134 0 0 -15 24 15 10 51 19 4 84 -28 -15 21 10 -15 27 20 -14 59 6 -15 49 22 135 0 0 -15 17 30 10 51 18 5 84 -29 -15 14 24 -15 20 35 -14 52 19 -15 42 38 136 0 0 -15 10 13 10 51 17 5 84 -30 -15 7 8 -15 13 19 -14 45 1 -15 35 23 137 0 0 -15 2 26 10 51 16 6 84 -31 -14 59 21 -15 5 32 -14 37 13 -15 27 37 138 0 0 -14 54 9 10 51 14 7 83 -32 -14 51 3 -14 57 15 -14 28 53 -15 19 21 139 0 0 -14 45 20 10 51 12 8 83 -33 -14 42 14 -14 48 27 -14 20 3 -15 10 35 140 0 0 -14 36 2 10 51 10 9 83 -34 -14 32 55 -14 39 8 -14 10 43 -15 1 18 141 0 0 -14 26 13 10 51 8 10 83 -35 -14 23 6 -14 29 19 -14 0 51 -14 51 31 142 0 0 -14 15 53 10 51 5 11 83 -36 -14 12 46 -14 19 0 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44 39 239 -16 38 55 37 38 49 7 39 18 51 38 25 55 - 92 0 0 39 8 14 10 28 37 38 240 -15 39 11 28 39 4 59 39 34 39 38 41 51 - 91 0 0 39 23 41 10 28 30 37 241 -14 39 26 55 39 20 27 39 50 3 38 57 22 - 90 0 0 39 38 44 10 28 23 36 241 -13 39 41 57 39 35 30 40 5 2 39 12 29 - 89 0 0 39 53 22 10 28 16 35 242 -13 39 56 35 39 50 8 40 19 36 39 27 10 - 88 0 0 40 7 35 10 28 10 35 243 -12 40 10 48 40 4 22 40 33 46 39 41 27 - 87 0 0 40 21 24 10 28 4 34 243 -11 40 24 37 40 18 12 40 47 32 39 55 20 - 86 0 0 40 34 49 10 27 58 33 244 -10 40 38 1 40 31 37 41 0 53 40 8 48 - 85 0 0 40 47 49 10 27 52 32 245 -10 40 51 1 40 44 38 41 13 50 40 21 52 - 84 0 0 41 0 25 10 27 46 32 246 -9 41 3 36 40 57 14 41 26 22 40 34 31 - 83 0 0 41 12 37 10 27 40 31 246 -8 41 15 48 41 9 26 41 38 31 40 46 46 - 82 0 0 41 24 24 10 27 35 30 247 -7 41 27 35 41 21 14 41 50 15 40 58 37 - 81 0 0 41 35 48 10 27 29 29 248 -7 41 38 58 41 32 38 42 1 36 41 10 3 - 80 0 0 41 46 47 10 27 24 29 248 -6 41 49 57 41 43 38 42 12 32 41 21 6 - 79 0 0 41 57 23 10 27 19 28 249 -5 42 0 32 41 54 14 42 23 5 41 31 44 - 78 0 0 42 7 35 10 27 14 27 250 -4 42 10 43 42 4 26 42 33 13 41 41 59 - 77 0 0 42 17 22 10 27 9 26 250 -4 42 20 31 42 14 14 42 42 58 41 51 49 - 76 0 0 42 26 47 10 27 5 26 251 -3 42 29 55 42 23 38 42 52 20 42 1 16 - 75 0 0 42 35 47 10 27 0 25 252 -2 42 38 55 42 32 39 43 1 18 42 10 19 - 74 0 0 42 44 24 10 26 56 24 253 -1 42 47 32 42 41 17 43 9 52 42 18 59 - 73 0 0 42 52 38 10 26 52 23 253 -1 42 55 45 42 49 30 43 18 3 42 27 15 Uncertainty in time = +/- 7 secs [Prediction of 2008 Apr 25.0] Data for the target star ------------------------ * name: TYC 0014-00517-1 * constellation : Pisces * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 00 41 41.5548 DE: +04 18 10.355 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .021 ) * V mag [mag]: 10.5 * B mag [mag]: 11.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1394) Algoa approx. diameter [km]: 11 approx. diameter ["]: .011 distance from Earth [AU]: 1.40400 * orbital information: orbit source: Preston date of fit: 2008 Apr 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 823 number of rejected observations: 53 time covered by the observations: 1936 Jun 12 - 2008 Feb 11 1 sigma uncertainty ellipse (major, minor, PA): 0.055, 0.032, 70° remarks: * orbital elements for (1394) Algoa : Mean anomaly = 60.67837277 deg Arg. of pericenter = 113.32891431 deg Long. of node = 178.92350331 deg Inclination = 2.67058121 deg Eccentricity = 0.07778289 Semimajor axis = 2.43868904 AU Perihelion dist = 2.24900077 AU Mag: H = 11.50, G = 0.15 Epoch of elements : MJD 55083.44400000 TDT (2009 Sep 09.444) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Sep 9 1394 Algoa 10h 38.5m UT 10.5 0 41 41.555 4 18 10.36TYC 0014-00517-1 11.0 15.8 11 1.3 1.404 -1.652 -14.11 -137.8233 4.307 19.70 5.18 10.6421 -0.11983 0.21084 -3.94226 -2.25139 -0.00211 -0.00089 2000 59.7870552009 9 6.00000113.328914178.923503 2.6705810.07778289 2.4386890 2.249000812.5 5.00.15 RATE 2.5880310 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.059 0.038 73 4.57 0.039 0 54581.5020090909_0517-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 25, 08:27 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org