IOTA/IOTA-ES occultation update for (2826) Ahti / TYC 7421-01126-1 event on 2007 Nov 01, 12:04 UT Visible from SE Asia Summary ------- On 2007 Nov 01 UT, the 37 km diameter asteroid (2826) Ahti will occult a 9.5 mag star in the constellation Corona Australis for observers along a path across SE Asia. In the case of an occultation, the combined light of the asteroid and the star will drop by 7.5 mag to 17.0 mag (the magnitude of the asteroid) for at most 1.2 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: 2007 Nov 01, 12:01 - 2007 Nov 01, 12:07 UT * magnitude of target star: 9.5 * magnitude drop [mag]: 7.5 * estimated maximum duration [s]: 1.2 * Moon: 54 % sunlit, 155° distance * Sun: 65° distance * rough path description: SE Asia Additional comments ------------------- 50" double star. The occultation path -------------------- * approximate projected width [km]: 39 * 1 sigma uncertainty interval [path widths]: +/- 3.60 * 1 sigma uncertainty interval [seconds]: +/- 5.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .078 +/- .049) * 1 sigma uncertainty ellipse (major, minor, PA): ( .078", .049", 89° ) * approx speed of asteroid's shadow [km/s]: 29.7505 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7421-01126-1 by 2826 Ahti on 2007 Nov 01 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 - 23 0 0 2 12 48 12 1 0 0 127 65 1 59 36 2 26 2 .. .. .. .. .. .. - 22 0 0 1 27 57 12 1 0 2 127 66 1 14 49 1 41 7 .. .. .. 3 16 34 - 21 0 0 0 43 44 12 1 0 3 127 68 0 30 39 0 56 50 .. .. .. 2 31 47 - 20 0 0 0 0 8 12 1 1 4 127 69 - 0 12 52 0 13 10 .. .. .. 1 47 38 - 19 0 0 - 0 42 47 12 1 1 5 127 70 - 0 55 44 - 0 29 49 - 2 28 22 1 4 9 - 18 0 0 - 1 25 2 12 1 2 7 127 71 - 1 37 55 - 1 12 8 - 3 10 4 0 21 20 - 17 0 0 - 2 6 36 12 1 2 8 127 72 - 2 19 24 - 1 53 46 - 3 51 5 - 0 20 48 - 16 0 0 - 2 47 27 12 1 3 9 127 74 - 3 0 11 - 2 34 41 - 4 31 24 - 1 2 13 - 15 0 0 - 3 27 35 12 1 4 10 127 75 - 3 40 15 - 3 14 53 - 5 10 59 - 1 42 55 - 14 0 0 - 4 6 59 12 1 5 11 127 76 - 4 19 36 - 3 54 22 - 5 49 50 - 2 22 53 - 13 0 0 - 4 45 39 12 1 6 13 127 77 - 4 58 11 - 4 33 6 - 6 27 58 - 3 2 7 - 12 0 0 - 5 23 34 12 1 7 14 127 78 - 5 36 2 - 5 11 5 - 7 5 20 - 3 40 35 - 11 0 0 - 6 0 43 12 1 8 15 127 79 - 6 13 8 - 5 48 18 - 7 41 57 - 4 18 18 - 10 0 0 - 6 37 7 12 1 9 16 127 80 - 6 49 28 - 6 24 46 - 8 17 49 - 4 55 15 - 9 0 0 - 7 12 45 12 1 10 17 126 81 - 7 25 1 - 7 0 27 - 8 52 55 - 5 31 25 - 8 0 0 - 7 47 36 12 1 12 18 126 82 - 7 59 48 - 7 35 22 - 9 27 14 - 6 6 48 - 7 0 0 - 8 21 40 12 1 13 19 126 83 - 8 33 49 - 8 9 30 -10 0 48 - 6 41 25 - 6 0 0 - 8 54 57 12 1 15 21 126 84 - 9 7 2 - 8 42 51 -10 33 34 - 7 15 14 - 5 0 0 - 9 27 27 12 1 16 22 126 85 - 9 39 29 - 9 15 25 -11 5 34 - 7 48 15 - 4 0 0 - 9 59 11 12 1 18 23 126 85 -10 11 8 - 9 47 12 -11 36 48 - 8 20 29 - 3 0 0 -10 30 6 12 1 20 24 126 86 -10 42 0 -10 18 11 -12 7 14 - 8 51 55 - 2 0 0 -11 0 15 12 1 22 25 126 86 -11 12 5 -10 48 24 -12 36 54 - 9 22 33 - 1 0 0 -11 29 36 12 1 24 26 126 85 -11 41 23 -11 17 48 -13 5 47 - 9 52 24 0 0 0 -11 58 10 12 1 25 27 126 85 -12 9 54 -11 46 26 -13 33 53 -10 21 26 1 0 0 -12 25 57 12 1 27 28 125 84 -12 37 37 -12 14 16 -14 1 13 -10 49 41 2 0 0 -12 52 57 12 1 30 29 125 83 -13 4 34 -12 41 19 -14 27 46 -11 17 9 3 0 0 -13 19 10 12 1 32 30 125 83 -13 30 44 -13 7 36 -14 53 33 -11 43 48 4 0 0 -13 44 36 12 1 34 31 125 82 -13 56 7 -13 33 5 -15 18 34 -12 9 41 5 0 0 -14 9 16 12 1 36 32 125 81 -14 20 43 -13 57 48 -15 42 49 -12 34 46 6 0 0 -14 33 9 12 1 38 33 125 80 -14 44 33 -14 21 44 -16 6 18 -12 59 4 7 0 0 -14 56 16 12 1 41 34 125 79 -15 7 37 -14 44 53 -16 29 1 -13 22 35 8 0 0 -15 18 36 12 1 43 36 125 78 -15 29 55 -15 7 17 -16 50 59 -13 45 19 9 0 0 -15 40 11 12 1 45 37 125 77 -15 51 27 -15 28 54 -17 12 12 -14 7 16 10 0 0 -16 1 1 12 1 48 38 125 76 -16 12 14 -15 49 46 -17 32 39 -14 28 28 11 0 0 -16 21 4 12 1 50 38 125 75 -16 32 15 -16 9 53 -17 52 22 -14 48 53 12 0 0 -16 40 23 12 1 53 39 124 74 -16 51 31 -16 29 14 -18 11 21 -15 8 32 13 0 0 -16 58 57 12 1 56 40 124 73 -17 10 3 -16 47 50 -18 29 35 -15 27 26 14 0 0 -17 16 46 12 1 58 41 124 72 -17 27 50 -17 5 42 -18 47 6 -15 45 34 15 0 0 -17 33 50 12 2 1 42 124 71 -17 44 52 -17 22 48 -19 3 52 -16 2 57 16 0 0 -17 50 11 12 2 4 43 124 70 -18 1 10 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39 37 128 0 0 25 31 6 12 7 45 3 226 -46 25 16 45 25 45 29 .. .. .. 27 29 51 129 0 0 26 20 59 12 7 45 2 227 -46 26 6 38 26 35 21 .. .. .. 28 19 41 130 0 0 27 10 27 12 7 45 0 227 -47 26 56 7 27 24 49 .. .. .. .. .. .. Data for the target star ------------------------ * name: TYC 7421-01126-1 * constellation : Corona Australis * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 19 01 40.8276 DE: -36 52 34.041 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .021 ) * V mag [mag]: 9.5 * B mag [mag]: 10.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2826) Ahti approx. diameter [km]: 37 approx. diameter ["]: .014 distance from Earth [AU]: 3.56600 * orbital information: orbit source: Preston date of fit: 2007 Oct 23 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 623 number of rejected observations: 10 time covered by the observations: 1939 Oct 18 - 2007 Jun 22 1 sigma uncertainty ellipse (major, minor, PA): 0.075, 0.044, 89° remarks: * orbital elements for (2826) Ahti : Mean anomaly = 107.07977900 deg Arg. of pericenter = 153.65454745 deg Long. of node = 33.74182378 deg Inclination = 15.46160341 deg Eccentricity = 0.04465466 Semimajor axis = 3.22354468 AU Perihelion dist = 3.07959837 AU Mag: H = 10.91, G = 0.15 Epoch of elements : MJD 54405.50300000 TDT (2007 Nov 01.503) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Nov 01 2826 Ahti 12h 4.4m UT 9.5 19 1 40.828-36 52 34.04TYC 7421-01126-1 10.0 17.0 37 1.2 3.566 3.318 11.42 63.925 -36.879 -5.19 -14.40 12.0730 -.09022 .31315 16.14129 4.62923 0.00540 -0.00004 2000 106.14264220071027.00000153.654547 33.741824 15.4616030.044654663.223544683.0795983710.85 0.15 RATE 1.7029560 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.078 0.049 89.1 4.600 0.051 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Oct 23, 22:01 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org