IOTA/IOTA-ES occultation update for (788) Hohensteina / TYC 0253-00312-1 event on 2012 Nov 13, 01:43 UT Visible from Africa Summary ------- On 2012 Nov 13 UT, the 118 km diameter asteroid (788) Hohensteina will occult a 9.8 mag star in the constellation Sextans for observers along a path across Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.4 mag to 14.2 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 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: 92 * date and approx. time of event: 2012 Nov 13, 01:39 - 2012 Nov 13, 01:42 UT * geocentric midpoint of event [JD]: 2456244.57175 * magnitude of target star: 9.8 * magnitude drop [mag]: 4.4 * estimated maximum duration [s]: 4.5 * Moon: 1 % sunlit, 58° distance * Sun: 70° distance * rough path description: Africa The occultation path -------------------- * approximate projected width [km]: 124 * 1 sigma uncertainty interval [path widths]: +/- 0.49 * 1 sigma uncertainty interval [seconds]: +/- 2.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .029 +/- .025) * 1 sigma uncertainty ellipse (major, minor, PA): ( .029", .025", 92° ) * approx speed of asteroid's shadow [km/s]: 26.5391 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0253-00312-1 by 788 Hohensteina on 2012 Nov 13 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 - 7 0 0 3 29 34 1 39 31 1 90 -64 2 55 53 4 3 8 2 22 47 4 35 56 - 6 0 0 3 29 10 1 39 31 2 90 -63 2 55 30 4 2 45 2 22 23 4 35 33 - 5 0 0 3 28 23 1 39 31 3 90 -63 2 54 42 4 1 58 2 21 35 4 34 46 - 4 0 0 3 27 11 1 39 32 4 90 -62 2 53 30 4 0 46 2 20 23 4 33 35 - 3 0 0 3 25 36 1 39 32 5 90 -61 2 51 54 3 59 11 2 18 46 4 32 0 - 2 0 0 3 23 36 1 39 32 6 90 -60 2 49 53 3 57 12 2 16 45 4 30 1 - 1 0 0 3 21 12 1 39 33 7 90 -59 2 47 29 3 54 48 2 14 20 4 27 38 0 0 0 3 18 23 1 39 34 8 90 -58 2 44 40 3 52 1 2 11 30 4 24 51 1 0 0 3 15 11 1 39 34 9 90 -57 2 41 26 3 48 49 2 8 16 4 21 41 2 0 0 3 11 34 1 39 35 10 90 -56 2 37 49 3 45 13 2 4 38 4 18 6 3 0 0 3 7 34 1 39 36 11 90 -55 2 33 47 3 41 14 2 0 35 4 14 7 4 0 0 3 3 9 1 39 37 12 91 -55 2 29 22 3 36 50 1 56 8 4 9 44 5 0 0 2 58 20 1 39 37 13 91 -54 2 24 32 3 32 2 1 51 17 4 4 58 6 0 0 2 53 7 1 39 38 14 91 -53 2 19 17 3 26 50 1 46 2 3 59 47 7 0 0 2 47 30 1 39 40 15 91 -52 2 13 39 3 21 15 1 40 22 3 54 13 8 0 0 2 41 29 1 39 41 16 91 -51 2 7 37 3 15 15 1 34 18 3 48 14 9 0 0 2 35 4 1 39 42 17 91 -50 2 1 10 3 8 52 1 27 50 3 41 52 10 0 0 2 28 15 1 39 43 18 91 -49 1 54 20 3 2 4 1 20 58 3 35 7 11 0 0 2 21 2 1 39 45 19 91 -48 1 47 5 2 54 53 1 13 42 3 27 57 12 0 0 2 13 26 1 39 46 20 91 -47 1 39 27 2 47 18 1 6 2 3 20 24 13 0 0 2 5 25 1 39 48 21 91 -46 1 31 25 2 39 20 0 57 58 3 12 27 14 0 0 1 57 1 1 39 49 22 91 -45 1 22 59 2 30 57 0 49 30 3 4 6 15 0 0 1 48 14 1 39 51 23 91 -44 1 14 9 2 22 12 0 40 39 2 55 23 16 0 0 1 39 2 1 39 53 24 91 -43 1 4 56 2 13 2 0 31 23 2 46 15 17 0 0 1 29 28 1 39 55 25 91 -42 0 55 19 2 3 30 0 21 44 2 36 45 18 0 0 1 19 29 1 39 57 26 90 -41 0 45 19 1 53 34 0 11 42 2 26 51 19 0 0 1 9 8 1 39 59 27 90 -40 0 34 55 1 43 15 0 1 16 2 16 34 20 0 0 0 58 23 1 40 1 28 90 -39 0 24 8 1 32 32 - 0 9 33 2 5 54 21 0 0 0 47 16 1 40 3 29 90 -38 0 12 58 1 21 27 - 0 20 46 1 54 51 22 0 0 0 35 45 1 40 5 30 90 -37 0 1 25 1 9 59 - 0 32 21 1 43 25 23 0 0 0 23 52 1 40 7 31 90 -36 - 0 10 31 0 58 8 - 0 44 19 1 31 37 24 0 0 0 11 36 1 40 10 32 90 -35 - 0 22 49 0 45 55 - 0 56 40 1 19 26 25 0 0 - 0 1 3 1 40 12 33 90 -34 - 0 35 31 0 33 19 - 1 9 24 1 6 52 26 0 0 - 0 14 3 1 40 15 34 90 -33 - 0 48 34 0 20 20 - 1 22 30 0 53 57 27 0 0 - 0 27 26 1 40 17 35 90 -32 - 1 2 0 0 7 0 - 1 35 59 0 40 39 28 0 0 - 0 41 12 1 40 20 36 89 -31 - 1 15 48 - 0 6 42 - 1 49 49 0 26 59 29 0 0 - 0 55 18 1 40 23 37 89 -30 - 1 29 57 - 0 20 46 - 2 4 2 0 12 58 30 0 0 - 1 9 47 1 40 25 38 89 -29 - 1 44 29 - 0 35 12 - 2 18 36 - 0 1 25 31 0 0 - 1 24 37 1 40 28 39 89 -28 - 1 59 22 - 0 49 59 - 2 33 32 - 0 16 10 32 0 0 - 1 39 48 1 40 31 40 88 -27 - 2 14 36 - 1 5 8 - 2 48 49 - 0 31 15 33 0 0 - 1 55 20 1 40 34 41 88 -26 - 2 30 11 - 1 20 37 - 3 4 27 - 0 46 41 34 0 0 - 2 11 13 1 40 37 42 88 -25 - 2 46 7 - 1 36 27 - 3 20 26 - 1 2 29 35 0 0 - 2 27 27 1 40 40 43 88 -24 - 3 2 23 - 1 52 37 - 3 36 45 - 1 18 36 36 0 0 - 2 44 0 1 40 44 44 87 -23 - 3 19 0 - 2 9 8 - 3 53 25 - 1 35 4 37 0 0 - 3 0 54 1 40 47 45 87 -22 - 3 35 56 - 2 25 58 - 4 10 24 - 1 51 51 38 0 0 - 3 18 7 1 40 50 46 86 -21 - 3 53 13 - 2 43 8 - 4 27 43 - 2 8 59 39 0 0 - 3 35 39 1 40 54 47 86 -20 - 4 10 48 - 3 0 38 - 4 45 22 - 2 26 25 40 0 0 - 3 53 31 1 40 57 48 86 -18 - 4 28 43 - 3 18 26 - 5 3 20 - 2 44 11 41 0 0 - 4 11 41 1 41 0 49 85 -17 - 4 46 56 - 3 36 34 - 5 21 36 - 3 2 15 42 0 0 - 4 30 10 1 41 4 50 84 -16 - 5 5 28 - 3 54 59 - 5 40 11 - 3 20 38 43 0 0 - 4 48 57 1 41 8 51 84 -15 - 5 24 18 - 4 13 43 - 5 59 4 - 3 39 19 44 0 0 - 5 8 1 1 41 11 52 83 -14 - 5 43 25 - 4 32 45 - 6 18 14 - 3 58 17 45 0 0 - 5 27 23 1 41 15 53 83 -13 - 6 2 50 - 4 52 3 - 6 37 42 - 4 17 33 46 0 0 - 5 47 1 1 41 19 54 82 -12 - 6 22 32 - 5 11 39 - 6 57 27 - 4 37 6 47 0 0 - 6 6 57 1 41 22 55 81 -11 - 6 42 30 - 5 31 31 - 7 17 28 - 4 56 55 48 0 0 - 6 27 8 1 41 26 56 80 -10 - 7 2 44 - 5 51 39 - 7 37 45 - 5 17 0 49 0 0 - 6 47 35 1 41 30 57 79 -9 - 7 23 14 - 6 12 3 - 7 58 17 - 5 37 21 50 0 0 - 7 8 17 1 41 34 58 78 -8 - 7 43 58 - 6 32 42 - 8 19 5 - 5 57 58 51 0 0 - 7 29 13 1 41 38 58 77 -7 - 8 4 58 - 6 53 36 - 8 40 7 - 6 18 49 52 0 0 - 7 50 25 1 41 42 59 76 -6 - 8 26 12 - 7 14 45 - 9 1 24 - 6 39 55 53 0 0 - 8 11 49 1 41 46 60 75 -5 - 8 47 40 - 7 36 7 - 9 22 55 - 7 1 14 54 0 0 - 8 33 28 1 41 50 61 74 -4 - 9 9 21 - 7 57 43 - 9 44 38 - 7 22 47 55 0 0 - 8 55 19 1 41 54 62 73 -3 - 9 31 14 - 8 19 31 -10 6 34 - 7 44 33 56 0 0 - 9 17 22 1 41 59 63 71 -1 - 9 53 20 - 8 41 32 -10 28 43 - 8 6 32 57 0 0 - 9 39 37 1 42 3 64 70 0 -10 15 38 - 9 3 44 -10 51 3 - 8 28 42 Uncertainty in time = +/- 3 secs Prediction of 2012 Jul 10.0 Data for the target star ------------------------ * name: TYC 0253-00312-1 * constellation : Sextans * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 10 38 00.1165 DE: +00 11 36.123 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .025, .023 ) * V mag [mag]: 9.8 * B mag [mag]: 10.7 * Apparent position with proper motion RA(deg): 159.6671834934 DE(deg): 0.1258095699 * Equation of equinoxes (radians) : 0.000056874251050 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (788) Hohensteina approx. diameter [km]: 118 approx. diameter ["]: .051 distance from Earth [AU]: 3.22100 * orbital information: orbit source: Preston date of fit: 2012 Jul 10 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1089 number of rejected observations: 93 time covered by the observations: 1914 Apr 28 - 2012 Mar 22 1 sigma uncertainty ellipse (major, minor, PA): 0.014, 0.008, 98° remarks: * orbital elements for (788) Hohensteina : Mean anomaly = 290.59555101 deg Arg. of pericenter = 48.48090355 deg Long. of node = 177.85638860 deg Inclination = 14.33692277 deg Eccentricity = 0.13191317 Semimajor axis = 3.12445357 AU Perihelion dist = 2.71229700 AU Mag: H = 8.61, G = 0.15 Epoch of elements : MJD 56244.07200000 TDT (2012 Nov 13.072) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 13 788 Hohensteina 1h 43.3m UT 9.8 10 38 0.117 0 11 36.12TYC 0253-00312-1 10.7 14.2 118 4.5 3.221 2.540 -14.85 81.0864 0.197 150.25 -18.03 1.7220 -0.11405 -0.28398 13.95723 -5.43861 -0.00530 0.00185 2000 289.868858201211 9.00000 48.480904177.856389 14.3369230.13191317 3.1244536 2.7122970 8.3 5.00.15 RATE 1.7846090 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.029 0.025 92 1.49 0.025 0 0-5 3 056118.0020121113_0312-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Sep 25, 20:00 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org