IOTA/IOTA-ES occultation update for (2995) Taratuta / TYC 4683-01378-1 event on 2012 Oct 26, 01:29 UT Visible from Africa, Brazil, Boliva, Peru Summary ------- On 2012 Oct 26 UT, the 18 km diameter asteroid (2995) Taratuta will occult a 10.0 mag star in the constellation Cetus for observers along a path across Africa, Brazil, Boliva, Peru. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.4 mag to 16.4 mag (the magnitude of the asteroid) for at most 1.5 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: UCAC. The event at a glimpse ---------------------- * Rank: 25 * date and approx. time of event: 2012 Oct 26, 01:21 - 2012 Oct 26, 01:38 UT * geocentric midpoint of event [JD]: 2456226.56241667 * magnitude of target star: 10.0 * magnitude drop [mag]: 6.4 * estimated maximum duration [s]: 1.5 * Moon: 87 % sunlit, 29° distance * Sun: 158° distance * rough path description: Africa, Brazil, Boliva, Peru The occultation path -------------------- * approximate projected width [km]: 18 * 1 sigma uncertainty interval [path widths]: +/- 2.64 * 1 sigma uncertainty interval [seconds]: +/- 5.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .048 +/- .034) * 1 sigma uncertainty ellipse (major, minor, PA): ( .048", .033", 83° ) * approx speed of asteroid's shadow [km/s]: 11.8674 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 4683-01378-1 by 2995 Taratuta on 2012 Oct 26 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 ' " Longitude Longitude Longitude Longitude 43 1 1 39 0 0 1 21 0 4 260 -25 42 24 43 43 38 35 39 29 31 47 25 0 36 44 32 38 0 0 1 21 6 9 256 -30 36 17 32 37 12 1 34 2 0 39 46 29 Latitude Latitude Latitude Latitude 35 0 0 37 39 59 1 21 8 10 255 -32 37 45 1 37 34 56 38 11 40 37 8 19 34 0 0 37 27 49 1 21 9 11 254 -33 37 32 53 37 22 46 37 59 35 36 56 5 33 0 0 37 15 10 1 21 11 12 254 -33 37 20 14 37 10 6 37 47 1 36 43 21 32 0 0 37 2 1 1 21 12 13 253 -34 37 7 6 36 56 57 37 33 57 36 30 8 31 0 0 36 48 23 1 21 14 14 252 -35 36 53 29 36 43 17 37 20 24 36 16 24 30 0 0 36 34 15 1 21 16 15 252 -36 36 39 21 36 29 8 37 6 20 36 2 11 29 0 0 36 19 37 1 21 18 15 251 -37 36 24 44 36 14 29 36 51 47 35 47 28 28 0 0 36 4 28 1 21 20 16 251 -38 36 9 36 35 59 20 36 36 44 35 32 14 27 0 0 35 48 50 1 21 23 17 250 -38 35 53 59 35 43 41 36 21 11 35 16 30 26 0 0 35 32 41 1 21 25 18 250 -39 35 37 51 35 27 31 36 5 7 35 0 16 25 0 0 35 16 1 1 21 28 19 249 -40 35 21 12 35 10 50 35 48 33 34 43 31 24 0 0 34 58 51 1 21 30 20 248 -41 35 4 2 34 53 39 35 31 29 34 26 15 23 0 0 34 41 10 1 21 33 20 248 -42 34 46 22 34 35 57 35 13 54 34 8 28 22 0 0 34 22 58 1 21 36 21 247 -43 34 28 11 34 17 44 34 55 48 33 50 10 21 0 0 34 4 15 1 21 39 22 247 -44 34 9 29 33 59 0 34 37 11 33 31 21 20 0 0 33 45 1 1 21 42 23 246 -44 33 50 16 33 39 45 34 18 3 33 12 1 19 0 0 33 25 15 1 21 45 24 246 -45 33 30 32 33 19 59 33 58 23 32 52 10 18 0 0 33 4 59 1 21 49 25 245 -46 33 10 16 32 59 41 33 38 13 32 31 47 17 0 0 32 44 11 1 21 53 26 244 -47 32 49 29 32 38 52 33 17 31 32 10 53 16 0 0 32 22 51 1 21 56 27 244 -48 32 28 11 32 17 32 32 56 18 31 49 27 15 0 0 32 1 1 1 22 0 28 243 -49 32 6 21 31 55 40 32 34 34 31 27 30 14 0 0 31 38 38 1 22 4 28 243 -50 31 44 0 31 33 17 32 12 18 31 5 1 13 0 0 31 15 44 1 22 8 29 242 -51 31 21 7 31 10 22 31 49 30 30 42 1 12 0 0 30 52 19 1 22 13 30 242 -52 30 57 42 30 46 55 31 26 11 30 18 29 11 0 0 30 28 22 1 22 17 31 241 -53 30 33 46 30 22 58 31 2 21 29 54 25 10 0 0 30 3 54 1 22 22 32 241 -54 30 9 19 29 58 28 30 37 59 29 29 51 9 0 0 29 38 54 1 22 27 33 240 -54 29 44 20 29 33 27 30 13 6 29 4 44 8 0 0 29 13 23 1 22 32 34 240 -55 29 18 50 29 7 55 29 47 41 28 39 7 7 0 0 28 47 20 1 22 37 35 239 -56 28 52 49 28 41 52 29 21 45 28 12 58 6 0 0 28 20 47 1 22 42 36 239 -57 28 26 17 28 15 17 28 55 19 27 46 18 5 0 0 27 53 43 1 22 48 37 238 -58 27 59 13 27 48 12 28 28 21 27 19 7 4 0 0 27 26 8 1 22 53 38 238 -59 27 31 39 27 20 36 28 0 52 26 51 26 3 0 0 26 58 2 1 22 59 39 237 -60 27 3 35 26 52 29 27 32 53 26 23 14 2 0 0 26 29 26 1 23 5 40 237 -61 26 35 0 26 23 52 27 4 23 25 54 32 1 0 0 26 0 20 1 23 11 41 236 -62 26 5 55 25 54 45 26 35 23 25 25 19 0 0 0 25 30 44 1 23 17 42 236 -63 25 36 20 25 25 8 26 5 53 24 55 37 - 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2012 Sep 26 1 sigma uncertainty ellipse (major, minor, PA): 0.043, 0.025, 81° remarks: * orbital elements for (2995) Taratuta : Mean anomaly = 256.74610329 deg Arg. of pericenter = 329.53535160 deg Long. of node = 169.85260818 deg Inclination = 14.83541100 deg Eccentricity = 0.13639761 Semimajor axis = 2.61546559 AU Perihelion dist = 2.25872235 AU Mag: H = 11.92, G = 0.15 Epoch of elements : MJD 56226.06200000 TDT (2012 Oct 26.062) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Oct 26 2995 Taratuta 1h 29.9m UT 10.0 1 9 52.566- 5 27 1.98TYC 4683-01378-1 10.5 16.4 18 1.5 1.794 -1.822 -18.33 -39.8347 -5.445 153.53 -12.53 1.4980 -0.05431 0.08162 -5.55508 -3.74277 0.00131 0.00177 2000 255.33357720121020.00000329.535352169.852608 14.8354110.13639761 2.6154656 2.258722312.4 5.00.15 RATE 2.3301320 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.048 0.033 83 3.64 0.037 0 0 4 1 056208.0020121026_1378-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 07, 19:23 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org