IOTA/IOTA-ES occultation update for (670) Ottegebe / TYC 0738-00750-1 event on 2012 Nov 20, 22:10 UT Visible from Russia, Europe Summary ------- On 2012 Nov 20 UT, the 34 km diameter asteroid (670) Ottegebe will occult a 10.5 mag star in the constellation Orion for observers along a path across Russia, Europe. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.2 mag to 13.7 mag (the magnitude of the asteroid) for at most 4.5 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 62 * date and approx. time of event: 2012 Nov 20, 21:59 - 2012 Nov 20, 22:22 UT * geocentric midpoint of event [JD]: 2456252.42418333 * magnitude of target star: 10.5 * magnitude drop [mag]: 3.2 * estimated maximum duration [s]: 4.5 * Moon: 54 % sunlit, 120° distance * Sun: 144° distance * rough path description: Russia, Europe The occultation path -------------------- * approximate projected width [km]: 42 * 1 sigma uncertainty interval [path widths]: +/- 0.98 * 1 sigma uncertainty interval [seconds]: +/- 4.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .031 +/- .027) * 1 sigma uncertainty ellipse (major, minor, PA): ( .031", .027", 90° ) * approx speed of asteroid's shadow [km/s]: 7.4758 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0738-00750-1 by 670 Ottegebe on 2012 Nov 20 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 - 37 0 0 18 35 26 22 22 12 0 77 -36 18 47 11 18 23 44 19 10 16 .. .. .. - 36 0 0 18 48 28 22 22 12 1 78 -37 19 0 13 18 36 44 19 23 20 .. .. .. - 35 0 0 19 1 52 22 22 11 2 78 -37 19 13 38 18 50 8 19 36 48 .. .. .. - 34 0 0 19 15 40 22 22 11 3 78 -38 19 27 27 19 3 55 19 50 38 .. .. .. - 33 0 0 19 29 51 22 22 9 4 79 -39 19 41 39 19 18 5 20 4 52 18 55 6 - 32 0 0 19 44 24 22 22 8 5 79 -40 19 56 13 19 32 37 20 19 29 19 9 36 - 31 0 0 19 59 20 22 22 6 6 79 -41 20 11 10 19 47 32 20 34 28 19 24 29 - 30 0 0 20 14 37 22 22 4 7 80 -42 20 26 29 20 2 48 20 49 48 19 39 43 - 29 0 0 20 30 16 22 22 2 8 80 -43 20 42 9 20 18 26 21 5 30 19 55 18 - 28 0 0 20 46 16 22 21 59 9 80 -44 20 58 10 20 34 24 21 21 34 20 11 15 - 27 0 0 21 2 37 22 21 57 10 81 -45 21 14 31 20 50 44 21 37 58 20 27 32 - 26 0 0 21 19 18 22 21 53 11 81 -46 21 31 13 21 7 24 21 54 42 20 44 10 - 25 0 0 21 36 18 22 21 50 12 82 -47 21 48 15 21 24 23 22 11 46 21 1 7 - 24 0 0 21 53 38 22 21 46 13 82 -48 22 5 37 21 41 42 22 29 10 21 18 24 - 23 0 0 22 11 18 22 21 42 14 82 -49 22 23 17 21 59 20 22 46 53 21 35 59 - 22 0 0 22 29 15 22 21 38 14 83 -50 22 41 16 22 17 17 23 4 54 21 53 53 - 21 0 0 22 47 31 22 21 33 15 83 -51 22 59 33 22 35 31 23 23 14 22 12 6 - 20 0 0 23 6 5 22 21 28 16 84 -52 23 18 8 22 54 4 23 41 51 22 30 36 - 19 0 0 23 24 56 22 21 23 17 84 -53 23 37 0 23 12 53 24 0 46 22 49 23 - 18 0 0 23 44 3 22 21 18 18 85 -54 23 56 9 23 32 0 24 19 57 23 8 27 - 17 0 0 24 3 27 22 21 12 19 85 -54 24 15 34 23 51 22 24 39 25 23 27 47 - 16 0 0 24 23 7 22 21 6 20 86 -55 24 35 15 24 11 1 24 59 8 23 47 23 - 15 0 0 24 43 2 22 21 0 21 86 -56 24 55 12 24 30 54 25 19 7 24 7 14 - 14 0 0 25 3 12 22 20 54 22 87 -57 25 15 23 24 51 3 25 39 21 24 27 21 - 13 0 0 25 23 36 22 20 47 23 87 -58 25 35 48 25 11 26 25 59 49 24 47 41 - 12 0 0 25 44 14 22 20 40 24 88 -59 25 56 28 25 32 3 26 20 31 25 8 15 - 11 0 0 26 5 6 22 20 33 24 88 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57 37 9 133 0 0 58 7 56 22 0 36 20 260 -8 58 19 28 57 56 26 58 42 9 57 33 58 134 0 0 58 4 31 22 0 33 20 261 -8 58 16 4 57 53 1 58 38 46 57 30 32 135 0 0 58 0 52 22 0 29 19 262 -7 58 12 25 57 49 21 58 35 8 57 26 51 136 0 0 57 56 57 22 0 26 19 263 -7 58 8 31 57 45 26 58 31 15 57 22 55 137 0 0 57 52 47 22 0 23 18 263 -6 58 4 21 57 41 15 58 27 7 57 18 44 138 0 0 57 48 22 22 0 20 18 264 -6 57 59 57 57 36 50 58 22 44 57 14 17 139 0 0 57 43 42 22 0 17 17 265 -5 57 55 17 57 32 9 58 18 5 57 9 34 140 0 0 57 38 46 22 0 14 17 266 -5 57 50 22 57 27 12 58 13 12 57 4 37 141 0 0 57 33 35 22 0 11 16 267 -4 57 45 12 57 22 0 58 8 3 56 59 23 142 0 0 57 28 8 22 0 9 16 268 -4 57 39 46 57 16 33 58 2 38 56 53 54 143 0 0 57 22 26 22 0 6 15 269 -3 57 34 4 57 10 49 57 56 58 56 48 9 144 0 0 57 16 28 22 0 3 15 269 -3 57 28 7 57 4 50 57 51 2 56 42 9 145 0 0 57 10 14 22 0 1 14 270 -2 57 21 53 56 58 35 57 44 51 56 35 52 146 0 0 57 3 44 21 59 58 13 271 -2 57 15 24 56 52 4 57 38 24 56 29 19 147 0 0 56 56 58 21 59 56 13 272 -1 57 8 39 56 45 18 57 31 40 56 22 31 148 0 0 56 49 55 21 59 54 12 273 -1 57 1 38 56 38 14 57 24 41 56 15 26 149 0 0 56 42 37 21 59 51 12 274 0 56 54 21 56 30 55 57 17 26 56 8 5 Uncertainty in time = +/- 5 secs Prediction of 2012 Nov 16.0 Data for the target star ------------------------ * name: TYC 0738-00750-1 * constellation : Orion * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 10 36.6940 DE: +11 55 38.193 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .024, .025 ) * V mag [mag]: 10.5 * B mag [mag]: 10.8 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (670) Ottegebe approx. diameter [km]: 34 approx. diameter ["]: .028 distance from Earth [AU]: 1.65800 * orbital information: orbit source: Preston date of fit: 2012 Nov 16 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 1322 number of rejected observations: 66 time covered by the observations: 1907 May 05 - 2012 Nov 08 1 sigma uncertainty ellipse (major, minor, PA): 0.019, 0.010, 89° remarks: * orbital elements for (670) Ottegebe : Mean anomaly = 49.83273499 deg Arg. of pericenter = 195.77225899 deg Long. of node = 174.75452568 deg Inclination = 7.53084902 deg Eccentricity = 0.19359680 Semimajor axis = 2.80490515 AU Perihelion dist = 2.26188448 AU Mag: H = 9.42, G = 0.15 Epoch of elements : MJD 56251.92400000 TDT (2012 Nov 20.924) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 20 670 Ottegebe 22h 10.8m UT 10.5 6 10 36.694 11 55 38.19TYC 0738-00750-1 10.8 13.7 34 4.5 1.658 -1.452 -6.89 59.6230 11.930 -156.24 -19.93 22.1804 -0.18460 0.56975 -4.01459 -1.29913 -0.00318 0.00102 2000 49.42906020121119.00000195.772259174.754526 7.5308490.19359680 2.8049052 2.2618845 9.8 5.00.15 RATE 2.0981030 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.031 0.027 90 1.98 0.028 0 0 0 3 056247.0020121120_0750-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 16, 08:27 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org