IOTA/IOTA-ES occultation update for (444) Gyptis / TYC 0174-00983-1 event on 2012 Dec 21, 01:37 UT Visible from Africa, Brazil, Peru Summary ------- On 2012 Dec 21 UT, the 193 km diameter asteroid (444) Gyptis will occult a 12.3 mag star in the constellation Monoceros for observers along a path across Africa, Brazil, Peru. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.6 mag to 12.0 mag (the magnitude of the asteroid) for at most 15.5 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: 99 * date and approx. time of event: 2012 Dec 21, 01:29 - 2012 Dec 21, 01:45 UT * geocentric midpoint of event [JD]: 2456282.56760417 * magnitude of target star: 12.3 * magnitude drop [mag]: 0.6 * estimated maximum duration [s]: 15.5 * Moon: 59 % sunlit, 98° distance * Sun: 157° distance * rough path description: Africa, Brazil, Peru The occultation path -------------------- * approximate projected width [km]: 195 * 1 sigma uncertainty interval [path widths]: +/- 0.21 * 1 sigma uncertainty interval [seconds]: +/- 7.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .065 +/- .028) * 1 sigma uncertainty ellipse (major, minor, PA): ( .065", .028", 90° ) * approx speed of asteroid's shadow [km/s]: 12.4275 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0174-00983-1 by 444 Gyptis on 2012 Dec 21 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 - 99 0 0 - 9 16 9 1 45 50 0 83 -12 - 8 22 57 -10 9 27 - 8 0 38 -10 31 52 - 98 0 0 - 9 8 27 1 45 50 1 82 -13 - 8 15 15 -10 1 45 - 7 52 56 -10 24 10 - 97 0 0 - 9 0 43 1 45 49 2 82 -14 - 8 7 31 - 9 54 1 - 7 45 12 -10 16 27 - 96 0 0 - 8 52 57 1 45 49 3 82 -15 - 7 59 45 - 9 46 16 - 7 37 26 -10 8 42 - 95 0 0 - 8 45 10 1 45 48 4 82 -16 - 7 51 58 - 9 38 29 - 7 29 38 -10 0 55 - 94 0 0 - 8 37 21 1 45 47 5 82 -17 - 7 44 9 - 9 30 41 - 7 21 50 - 9 53 6 - 93 0 0 - 8 29 32 1 45 47 6 82 -18 - 7 36 19 - 9 22 51 - 7 14 0 - 9 45 17 - 92 0 0 - 8 21 41 1 45 45 7 82 -19 - 7 28 28 - 9 15 0 - 7 6 9 - 9 37 26 - 91 0 0 - 8 13 49 1 45 44 8 81 -20 - 7 20 36 - 9 7 8 - 6 58 17 - 9 29 34 - 90 0 0 - 8 5 56 1 45 43 9 81 -21 - 7 12 43 - 8 59 16 - 6 50 24 - 9 21 42 - 89 0 0 - 7 58 3 1 45 41 10 81 -22 - 7 4 50 - 8 51 22 - 6 42 30 - 9 13 48 - 88 0 0 - 7 50 9 1 45 40 11 81 -23 - 6 56 56 - 8 43 29 - 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1 47 27 1 30 0 30 279 -12 - 0 54 29 - 2 40 31 - 0 32 16 - 3 2 50 54 0 0 - 1 52 54 1 29 56 29 279 -11 - 0 59 55 - 2 45 59 - 0 37 42 - 3 8 18 55 0 0 - 1 58 27 1 29 51 28 279 -10 - 1 5 28 - 2 51 32 - 0 43 15 - 3 13 52 56 0 0 - 2 4 6 1 29 47 27 279 -9 - 1 11 7 - 2 57 12 - 0 48 53 - 3 19 32 57 0 0 - 2 9 51 1 29 43 26 279 -8 - 1 16 51 - 3 2 57 - 0 54 37 - 3 25 18 58 0 0 - 2 15 42 1 29 39 25 279 -7 - 1 22 41 - 3 8 49 - 1 0 27 - 3 31 9 59 0 0 - 2 21 38 1 29 36 24 279 -7 - 1 28 37 - 3 14 45 - 1 6 23 - 3 37 6 60 0 0 - 2 27 40 1 29 32 23 279 -6 - 1 34 38 - 3 20 48 - 1 12 24 - 3 43 9 61 0 0 - 2 33 47 1 29 29 22 279 -5 - 1 40 45 - 3 26 56 - 1 18 31 - 3 49 17 62 0 0 - 2 40 0 1 29 26 21 279 -4 - 1 46 58 - 3 33 9 - 1 24 43 - 3 55 30 63 0 0 - 2 46 18 1 29 22 20 279 -3 - 1 53 15 - 3 39 27 - 1 31 0 - 4 1 49 64 0 0 - 2 52 41 1 29 19 19 279 -2 - 1 59 38 - 3 45 51 - 1 37 22 - 4 8 13 65 0 0 - 2 59 9 1 29 17 18 279 -1 - 2 6 5 - 3 52 20 - 1 43 50 - 4 14 42 Uncertainty in time = +/- 7 secs Prediction of 2012 Dec 3.0 Data for the target star ------------------------ * name: TYC 0174-00983-1 * constellation : Monoceros * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 07 02 34.3185 DE: +07 15 21.730 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .063, .027 ) * V mag [mag]: 12.3 * B mag [mag]: 14.1 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (444) Gyptis approx. diameter [km]: 193 approx. diameter ["]: .139 distance from Earth [AU]: 1.91700 * orbital information: orbit source: Preston date of fit: 2012 Nov 29 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 1149 number of rejected observations: 133 time covered by the observations: 1900 Jul 25 - 2012 Nov 29 1 sigma uncertainty ellipse (major, minor, PA): 0.016, 0.010, 95° remarks: * orbital elements for (444) Gyptis : Mean anomaly = 89.55518110 deg Arg. of pericenter = 155.39561346 deg Long. of node = 195.76462751 deg Inclination = 10.27542522 deg Eccentricity = 0.17503237 Semimajor axis = 2.77128740 AU Perihelion dist = 2.28622239 AU Mag: H = 7.93, G = 0.22 Epoch of elements : MJD 56282.06700000 TDT (2012 Dec 21.067) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 21 444 Gyptis 1h 37.3m UT 12.3 7 2 34.318 7 15 21.73TYC 0174-00983-1 14.1 12.0 193 15.5 1.917 -2.162 -1.18 -8.7296 7.256 155.19 -23.44 1.6225 0.00407 -0.12593 -7.00967 -0.25799 -0.00150 0.00169 2000 89.11358820121219.00000155.395613195.764628 10.2754250.17503237 2.7712874 2.2862224 7.8 5.00.22 RATE 2.1363960 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.065 0.028 90 1.21 0.028 0 0 5 0 056264.0020121221_0983-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 29, 23:57 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org