IOTA/IOTA-ES occultation update for (889) Erynia / TYC 4694-00197-1 event on 2012 Nov 02, 00:03 UT Visible from SW Asia, Africa, Venezuela, Colombia Summary ------- On 2012 Nov 02 UT, the 18 km diameter asteroid (889) Erynia will occult a 10.5 mag star in the constellation Cetus for observers along a path across SW Asia, Africa, Venezuela, Colombia. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.7 mag to 13.1 mag (the magnitude of the asteroid) for at most 2.8 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: 46 * date and approx. time of event: 2012 Nov 01, 23:49 - 2012 Nov 02, 00:19 UT * geocentric midpoint of event [JD]: 2456233.50311667 * magnitude of target star: 10.5 * magnitude drop [mag]: 2.7 * estimated maximum duration [s]: 2.8 * Moon: 91 % sunlit, 44° distance * Sun: 162° distance * rough path description: SW Asia, Africa, Venezuela, Colombia The occultation path -------------------- * approximate projected width [km]: 20 * 1 sigma uncertainty interval [path widths]: +/- 1.41 * 1 sigma uncertainty interval [seconds]: +/- 5.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .051 +/- .036) * 1 sigma uncertainty ellipse (major, minor, PA): ( .052", .035", 78° ) * approx speed of asteroid's shadow [km/s]: 6.5297 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 4694-00197-1 by 889 Erynia on 2012 Nov 1 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 -100 0 0 8 55 56 24 19 5 0 93 -1 9 1 24 8 50 28 9 16 50 .. .. .. - 99 0 0 8 53 15 24 19 5 1 93 -2 8 58 42 8 47 47 9 14 8 .. .. .. - 98 0 0 8 50 55 24 19 4 2 93 -3 8 56 22 8 45 27 9 11 47 .. .. .. - 97 0 0 8 48 55 24 19 3 3 93 -4 8 54 23 8 43 28 9 9 48 8 28 7 - 96 0 0 8 47 17 24 19 2 4 93 -5 8 52 45 8 41 50 9 8 9 8 26 29 - 95 0 0 8 46 0 24 19 1 5 94 -6 8 51 27 8 40 33 9 6 52 8 25 12 - 94 0 0 8 45 4 24 18 59 6 94 -7 8 50 31 8 39 37 9 5 55 8 24 16 - 93 0 0 8 44 28 24 18 57 7 94 -8 8 49 55 8 39 1 9 5 19 8 23 41 - 92 0 0 8 44 14 24 18 54 8 94 -9 8 49 41 8 38 47 9 5 4 8 23 27 - 91 0 0 8 44 19 24 18 52 9 94 -10 8 49 46 8 38 53 9 5 10 8 23 33 - 90 0 0 8 44 46 24 18 49 10 94 -11 8 50 13 8 39 19 9 5 36 8 23 59 - 89 0 0 8 45 33 24 18 45 11 95 -12 8 51 0 8 40 6 9 6 23 8 24 46 - 88 0 0 8 46 40 24 18 41 12 95 -13 8 52 7 8 41 13 9 7 30 8 25 54 - 87 0 0 8 48 8 24 18 38 13 95 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54 50 9 43 55 10 10 17 9 28 32 - 71 0 0 9 55 59 24 16 55 28 99 -29 10 1 27 9 50 31 10 16 54 9 35 8 - 70 0 0 10 2 54 24 16 47 29 99 -30 10 8 22 9 57 26 10 23 49 9 42 2 - 69 0 0 10 10 6 24 16 38 30 99 -31 10 15 35 10 4 38 10 31 3 9 49 14 - 68 0 0 10 17 37 24 16 29 31 99 -32 10 23 6 10 12 9 10 38 34 9 56 44 - 67 0 0 10 25 25 24 16 19 32 100 -33 10 30 54 10 19 57 10 46 23 10 4 31 - 66 0 0 10 33 31 24 16 10 33 100 -34 10 39 0 10 28 2 10 54 29 10 12 36 - 65 0 0 10 41 54 24 16 0 33 101 -34 10 47 23 10 36 25 11 2 53 10 20 59 - 64 0 0 10 50 34 24 15 50 34 101 -35 10 56 4 10 45 5 11 11 34 10 29 38 - 63 0 0 10 59 31 24 15 39 35 101 -36 11 5 1 10 54 2 11 20 32 10 38 34 - 62 0 0 11 8 45 24 15 29 36 102 -37 11 14 15 11 3 15 11 29 47 10 47 47 - 61 0 0 11 18 16 24 15 18 37 102 -38 11 23 46 11 12 46 11 39 18 10 57 17 - 60 0 0 11 28 3 24 15 7 38 103 -39 11 33 33 11 22 32 11 49 6 11 7 3 - 59 0 0 11 38 6 24 14 56 39 103 -40 11 43 36 11 32 35 11 59 10 11 17 5 - 58 0 0 11 48 25 24 14 44 40 104 -41 11 53 56 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42 18 57 70 0 0 42 46 31 23 50 13 10 257 -23 42 52 2 42 41 1 43 7 35 42 25 31 71 0 0 42 52 49 23 50 10 10 257 -23 42 58 19 42 47 19 43 13 52 42 31 49 72 0 0 42 58 52 23 50 8 9 258 -22 43 4 22 42 53 22 43 19 54 42 37 53 73 0 0 43 4 40 23 50 6 8 259 -21 43 10 10 42 59 10 43 25 41 42 43 43 74 0 0 43 10 13 23 50 4 7 259 -20 43 15 43 43 4 44 43 31 13 42 49 17 75 0 0 43 15 32 23 50 3 7 260 -20 43 21 1 43 10 3 43 36 31 42 54 36 76 0 0 43 20 35 23 50 1 6 261 -19 43 26 4 43 15 6 43 41 33 42 59 41 77 0 0 43 25 24 23 50 0 5 261 -18 43 30 53 43 19 55 43 46 21 43 4 30 78 0 0 43 29 57 23 49 59 4 262 -18 43 35 26 43 24 29 43 50 54 43 9 5 79 0 0 43 34 16 23 49 58 4 263 -17 43 39 44 43 28 48 43 55 12 43 13 25 80 0 0 43 38 20 23 49 57 3 263 -16 43 43 48 43 32 52 43 59 14 43 17 29 81 0 0 43 42 8 23 49 56 2 264 -15 43 47 36 43 36 41 44 3 2 43 21 18 82 0 0 43 45 42 23 49 56 2 265 -15 43 51 10 43 40 15 44 6 35 43 24 53 83 0 0 43 49 0 23 49 55 1 265 -14 43 54 28 43 43 33 44 9 53 43 28 12 84 0 0 43 52 3 23 49 55 0 266 -13 43 57 31 43 46 36 44 12 55 43 31 16 Uncertainty in time = +/- 6 secs Prediction of 2012 Oct 8.0 Data for the target star ------------------------ * name: TYC 4694-00197-1 * constellation : Cetus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 02 22 49.6832 DE: -02 49 19.662 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .027, .024 ) * V mag [mag]: 10.5 * B mag [mag]: 11.1 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (889) Erynia approx. diameter [km]: 18 approx. diameter ["]: .025 distance from Earth [AU]: 0.98900 * orbital information: orbit source: Preston date of fit: 2012 Oct 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1092 number of rejected observations: 40 time covered by the observations: 1918 Mar 05 - 2012 Oct 01 1 sigma uncertainty ellipse (major, minor, PA): 0.044, 0.026, 74° remarks: * orbital elements for (889) Erynia : Mean anomaly = 350.65316646 deg Arg. of pericenter = 277.92050257 deg Long. of node = 132.73217157 deg Inclination = 8.09732980 deg Eccentricity = 0.20412171 Semimajor axis = 2.44673180 AU Perihelion dist = 1.94730072 AU Mag: H = 10.97, G = 0.15 Epoch of elements : MJD 56233.00300000 TDT (2012 Nov 02.003) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 2 889 Erynia 0h 4.5m UT 10.5 2 22 49.683- 2 49 19.66TYC 4694-00197-1 11.1 13.1 18 2.8 0.989 -2.087 -9.79 -7.0895 -2.818 174.77 -14.81 0.0748 -0.13251 0.42259 -3.51682 -1.10243 0.00013 0.00159 2000 349.87980920121030.00000277.920503132.732172 8.0973300.20412171 2.4467318 1.947300711.1 5.00.15 RATE 2.5752810 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.052 0.035 78 2.41 0.035 0 0 2-2 056208.0020121102_0197-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 07, 19:48 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org