IOTA/IOTA-ES occultation update for (220) Stephania / TYC 0822-01218-1 event on 2012 Nov 15, 07:13 UT Visible from Caribbean, Mexico Summary ------- On 2012 Nov 15 UT, the 32 km diameter asteroid (220) Stephania will occult a 9.9 mag star in the constellation Cancer for observers along a path across Caribbean, Mexico. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.3 mag to 16.2 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 Hugh Harris, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 42 * date and approx. time of event: 2012 Nov 15, 07:04 - 2012 Nov 15, 07:15 UT * geocentric midpoint of event [JD]: 2456246.8013875 * magnitude of target star: 9.9 * magnitude drop [mag]: 6.3 * estimated maximum duration [s]: 2.8 * Moon: 3 % sunlit, 115° distance * Sun: 95° distance * rough path description: Caribbean, Mexico The occultation path -------------------- * approximate projected width [km]: 33 * 1 sigma uncertainty interval [path widths]: +/- 1.56 * 1 sigma uncertainty interval [seconds]: +/- 4.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .030 +/- .027) * 1 sigma uncertainty ellipse (major, minor, PA): ( .030", .027", 96° ) * approx speed of asteroid's shadow [km/s]: 11.3936 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0822-01218-1 by 220 Stephania on 2012 Nov 15 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 Latitude Latitude Latitude Latitude - 25 0 0 - 6 14 43 7 15 35 73 1 0 - 6 26 22 - 6 3 6 - 7 2 46 - 5 26 53 - 26 0 0 - 5 24 26 7 15 22 74 5 -1 - 5 36 2 - 5 12 50 - 6 12 20 - 4 36 43 - 27 0 0 - 4 34 27 7 15 9 75 9 -3 - 4 46 2 - 4 22 53 - 5 22 12 - 3 46 54 - 28 0 0 - 3 44 50 7 14 56 76 14 -4 - 3 56 22 - 3 33 18 - 4 32 26 - 2 57 26 - 29 0 0 - 2 55 36 7 14 43 76 19 -5 - 3 7 5 - 2 44 7 - 3 43 1 - 2 8 22 - 30 0 0 - 2 6 47 7 14 30 76 24 -6 - 2 18 14 - 1 55 21 - 2 54 2 - 1 19 44 - 31 0 0 - 1 18 26 7 14 17 77 29 -8 - 1 29 51 - 1 7 3 - 2 5 31 - 0 31 34 - 32 0 0 - 0 30 35 7 14 4 77 35 -9 - 0 41 57 - 0 19 14 - 1 17 28 0 16 6 - 33 0 0 0 16 44 7 13 51 77 41 -10 0 5 26 0 28 2 - 0 29 56 1 3 14 - 34 0 0 1 3 31 7 13 39 77 46 -11 0 52 15 1 14 46 0 17 2 1 49 48 - 35 0 0 1 49 42 7 13 26 76 51 -13 1 38 30 2 0 54 1 3 26 2 35 47 - 36 0 0 2 35 17 7 13 13 76 56 -14 2 24 8 2 46 26 1 49 14 3 21 9 - 37 0 0 3 20 14 7 13 1 75 61 -15 3 9 8 3 31 20 2 34 25 4 5 53 - 38 0 0 4 4 32 7 12 48 75 65 -16 3 53 29 4 15 35 3 18 56 4 49 58 - 39 0 0 4 48 10 7 12 36 74 69 -18 4 37 10 4 59 9 4 2 47 5 33 22 - 40 0 0 5 31 5 7 12 24 73 72 -19 5 20 9 5 42 1 4 45 56 6 16 4 - 41 0 0 6 13 19 7 12 12 73 75 -20 6 2 25 6 24 11 5 28 23 6 58 3 - 42 0 0 6 54 48 7 12 0 72 78 -21 6 43 58 7 5 37 6 10 7 7 39 19 - 43 0 0 7 35 33 7 11 48 71 80 -22 7 24 47 7 46 19 6 51 6 8 19 50 - 44 0 0 8 15 33 7 11 36 70 82 -24 8 4 50 8 26 16 7 31 20 8 59 36 - 45 0 0 8 54 47 7 11 25 69 84 -25 8 44 8 9 5 26 8 10 49 9 38 36 - 46 0 0 9 33 15 7 11 14 68 86 -26 9 22 39 9 43 51 8 49 31 10 16 50 - 47 0 0 10 10 56 7 11 2 67 87 -27 10 0 23 10 21 28 9 27 26 10 54 17 - 48 0 0 10 47 50 7 10 51 66 89 -28 10 37 21 10 58 19 10 4 34 11 30 57 - 49 0 0 11 23 56 7 10 41 65 90 -29 11 13 30 11 34 22 10 40 54 12 6 49 - 50 0 0 11 59 15 7 10 30 64 91 -31 11 48 52 12 9 37 11 16 26 12 41 54 - 51 0 0 12 33 45 7 10 19 63 92 -32 12 23 26 12 44 4 11 51 10 13 16 11 - 52 0 0 13 7 27 7 10 9 62 92 -33 12 57 11 13 17 43 12 25 6 13 49 39 - 53 0 0 13 40 21 7 9 59 61 93 -34 13 30 9 13 50 34 12 58 14 14 22 20 - 54 0 0 14 12 27 7 9 49 60 94 -35 14 2 18 14 22 36 13 30 33 14 54 13 - 55 0 0 14 43 45 7 9 39 59 94 -36 14 33 38 14 53 51 14 2 3 15 25 18 - 56 0 0 15 14 14 7 9 30 58 95 -37 15 4 11 15 24 17 14 32 46 15 55 34 - 57 0 0 15 43 56 7 9 20 57 95 -38 15 33 56 15 53 55 15 2 40 16 25 3 - 58 0 0 16 12 49 7 9 11 56 95 -39 16 2 52 16 22 46 15 31 46 16 53 44 - 59 0 0 16 40 55 7 9 2 55 95 -40 16 31 1 16 50 49 16 0 4 17 21 38 - 60 0 0 17 8 14 7 8 53 54 96 -42 16 58 22 17 18 4 16 27 34 17 48 45 - 61 0 0 17 34 45 7 8 44 52 96 -43 17 24 56 17 44 33 16 54 17 18 15 4 - 62 0 0 18 0 29 7 8 36 51 96 -44 17 50 43 18 10 14 17 20 13 18 40 37 - 63 0 0 18 25 26 7 8 28 50 96 -45 18 15 43 18 35 9 17 45 21 19 5 23 - 64 0 0 18 49 37 7 8 19 49 96 -46 18 39 57 18 59 17 18 9 43 19 29 23 - 65 0 0 19 13 2 7 8 12 48 96 -47 19 3 24 19 22 39 18 33 19 19 52 38 - 66 0 0 19 35 41 7 8 4 47 96 -48 19 26 6 19 45 16 18 56 8 20 15 6 - 67 0 0 19 57 34 7 7 56 46 96 -49 19 48 2 20 7 7 19 18 12 20 36 50 - 68 0 0 20 18 43 7 7 49 45 96 -50 20 9 12 20 28 13 19 39 30 20 57 49 - 69 0 0 20 39 6 7 7 42 44 96 -51 20 29 38 20 48 34 20 0 3 21 18 3 - 70 0 0 20 58 45 7 7 34 43 96 -52 20 49 19 21 8 11 20 19 51 21 37 33 - 71 0 0 21 17 40 7 7 28 42 95 -53 21 8 16 21 27 4 20 38 55 21 56 19 - 72 0 0 21 35 51 7 7 21 41 95 -54 21 26 30 21 45 13 20 57 14 22 14 22 - 73 0 0 21 53 19 7 7 14 40 95 -55 21 43 59 22 2 39 21 14 50 22 31 41 - 74 0 0 22 10 4 7 7 8 39 95 -56 22 0 46 22 19 21 21 31 43 22 48 18 - 75 0 0 22 26 6 7 7 2 39 95 -56 22 16 50 22 35 22 21 47 53 23 4 13 - 76 0 0 22 41 26 7 6 56 38 94 -57 22 32 11 22 50 39 22 3 20 23 19 25 - 77 0 0 22 56 3 7 6 50 37 94 -58 22 46 51 23 5 15 22 18 4 23 33 55 - 78 0 0 23 9 59 7 6 44 36 94 -59 23 0 48 23 19 9 22 32 7 23 47 45 - 79 0 0 23 23 13 7 6 38 35 93 -60 23 14 4 23 32 22 22 45 27 24 0 53 - 80 0 0 23 35 46 7 6 33 34 93 -61 23 26 39 23 44 54 22 58 7 24 13 20 - 81 0 0 23 47 39 7 6 28 33 93 -62 23 38 32 23 56 45 23 10 5 24 25 7 - 82 0 0 23 58 51 7 6 23 32 93 -63 23 49 46 24 7 56 23 21 22 24 36 13 - 83 0 0 24 9 23 7 6 18 31 92 -64 24 0 19 24 18 26 23 31 59 24 46 40 - 84 0 0 24 19 14 7 6 13 30 92 -65 24 10 11 24 28 17 23 41 56 24 56 27 - 85 0 0 24 28 26 7 6 8 29 91 -66 24 19 25 24 37 28 23 51 12 25 5 34 - 86 0 0 24 36 59 7 6 4 28 91 -67 24 27 58 24 45 59 23 59 49 25 14 3 - 87 0 0 24 44 52 7 5 59 27 91 -67 24 35 52 24 53 51 24 7 46 25 21 52 - 88 0 0 24 52 6 7 5 55 26 90 -68 24 43 8 25 1 5 24 15 4 25 29 3 - 89 0 0 24 58 42 7 5 51 25 90 -69 24 49 44 25 7 40 24 21 43 25 35 35 - 90 0 0 25 4 39 7 5 47 24 90 -70 24 55 42 25 13 36 24 27 43 25 41 29 - 91 0 0 25 9 57 7 5 43 23 89 -71 25 1 1 25 18 54 24 33 4 25 46 45 - 92 0 0 25 14 38 7 5 40 23 89 -72 25 5 42 25 23 33 24 37 47 25 51 23 - 93 0 0 25 18 40 7 5 36 22 88 -73 25 9 44 25 27 35 24 41 51 25 55 23 - 94 0 0 25 22 4 7 5 33 21 88 -73 25 13 9 25 30 59 24 45 17 25 58 45 - 95 0 0 25 24 51 7 5 30 20 88 -74 25 15 56 25 33 45 24 48 5 26 1 30 - 96 0 0 25 27 0 7 5 27 19 87 -75 25 18 5 25 35 54 24 50 15 26 3 38 - 97 0 0 25 28 31 7 5 24 18 87 -76 25 19 37 25 37 25 24 51 48 26 5 8 - 98 0 0 25 29 25 7 5 21 17 86 -77 25 20 31 25 38 19 24 52 42 26 6 2 - 99 0 0 25 29 41 7 5 18 16 86 -78 25 20 47 25 38 35 24 52 59 26 6 18 -100 0 0 25 29 20 7 5 16 15 86 -78 25 20 26 25 38 14 24 52 38 26 5 57 -101 0 0 25 28 22 7 5 14 14 85 -79 25 19 28 25 37 16 24 51 40 26 4 59 -102 0 0 25 26 47 7 5 11 13 85 -80 25 17 53 25 35 41 24 50 4 26 3 24 -103 0 0 25 24 35 7 5 9 13 84 -80 25 15 40 25 33 29 24 47 51 26 1 13 -104 0 0 25 21 45 7 5 7 12 84 -81 25 12 50 25 30 39 24 45 0 25 58 24 -105 0 0 25 18 18 7 5 6 11 84 -82 25 9 23 25 27 13 24 41 32 25 54 59 -106 0 0 25 14 14 7 5 4 10 83 -82 25 5 19 25 23 9 24 37 26 25 50 57 -107 0 0 25 9 33 7 5 2 9 83 -83 25 0 37 25 18 29 24 32 43 25 46 18 -108 0 0 25 4 15 7 5 1 8 82 -83 24 55 19 25 13 11 24 27 23 25 41 2 -109 0 0 24 58 20 7 5 0 7 82 -83 24 49 23 25 7 16 24 21 25 25 35 9 -110 0 0 24 51 47 7 4 59 6 81 -84 24 42 49 25 0 44 24 14 50 25 28 39 -111 0 0 24 44 37 7 4 58 5 81 -84 24 35 39 24 53 35 24 7 37 25 21 32 -112 0 0 24 36 50 7 4 57 4 81 -84 24 27 51 24 45 49 23 59 46 25 13 48 -113 0 0 24 28 25 7 4 57 3 80 -83 24 19 25 24 37 25 23 51 18 25 5 27 -114 0 0 24 19 23 7 4 56 2 80 -83 24 10 22 24 28 23 23 42 11 24 56 28 -115 0 0 24 9 43 7 4 56 2 79 -83 24 0 41 24 18 44 23 32 27 24 46 52 -116 0 0 23 59 25 7 4 56 1 79 -82 23 50 22 24 8 28 23 22 5 24 36 39 Uncertainty in time = +/- 5 secs Prediction of 2012 Sep 25.0 Data for the target star ------------------------ * name: TYC 0822-01218-1 * constellation : Cancer * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 09 15 09.0005 DE: +10 22 56.549 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .026, .026 ) * V mag [mag]: 9.9 * B mag [mag]: 11.5 * Apparent position with proper motion RA(deg): 138.9650601620 DE(deg): 10.3266579250 * Equation of equinoxes (radians) : 0.000057713755638 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (220) Stephania approx. diameter [km]: 32 approx. diameter ["]: .018 distance from Earth [AU]: 2.46600 * orbital information: orbit source: Preston date of fit: 2012 Jul 10 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1024 number of rejected observations: 63 time covered by the observations: 1931 Mar 21 - 2012 Feb 18 1 sigma uncertainty ellipse (major, minor, PA): 0.016, 0.010, 111° remarks: * orbital elements for (220) Stephania : Mean anomaly = 118.51218364 deg Arg. of pericenter = 78.57238287 deg Long. of node = 257.99257804 deg Inclination = 7.59010229 deg Eccentricity = 0.25850293 Semimajor axis = 2.34787694 AU Perihelion dist = 1.74094387 AU Mag: H = 11.06, G = 0.15 Epoch of elements : MJD 56246.30100000 TDT (2012 Nov 15.301) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 15 220 Stephania 7h 14.0m UT 9.9 9 15 9.001 10 22 56.55TYC 0822-01218-1 11.5 16.2 32 2.8 2.466 1.234 -13.93 -24.4945 10.386 67.67 -18.60 7.2333 -0.13938 -0.18176 5.10881 -3.90595 -0.00559 0.00181 2000 116.785946201211 9.00000 78.572383257.992578 7.5901020.25850293 2.3478769 1.740943911.0 5.00.15 RATE 2.7396250 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.030 0.027 96 2.56 0.028 0 0-5-1 056195.0020121115_1218-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Sep 25, 20:27 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org