IOTA/IOTA-ES occultation update for (2054) Gawain / TYC 1897-01389-1 event on 2012 Dec 25, 11:58 UT Visible from Mexico, Taiwan Summary ------- On 2012 Dec 25 UT, the 21 km diameter asteroid (2054) Gawain will occult a 10.4 mag star in the constellation Gemini for observers along a path across Mexico, Taiwan. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.2 mag to 15.6 mag (the magnitude of the asteroid) for at most 1.9 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: 21 * date and approx. time of event: 2012 Dec 25, 11:48 - 2012 Dec 25, 12:06 UT * geocentric midpoint of event [JD]: 2456286.99825833 * magnitude of target star: 10.4 * magnitude drop [mag]: 5.2 * estimated maximum duration [s]: 1.9 * Moon: 93 % sunlit, 38° distance * Sun: 173° distance * rough path description: Mexico, Taiwan The occultation path -------------------- * approximate projected width [km]: 21 * 1 sigma uncertainty interval [path widths]: +/- 3.18 * 1 sigma uncertainty interval [seconds]: +/- 7.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .078 +/- .054) * 1 sigma uncertainty ellipse (major, minor, PA): ( .078", .053", 98° ) * approx speed of asteroid's shadow [km/s]: 11.1140 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1897-01389-1 by 2054 Gawain on 2012 Dec 25 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 92 0 0 9 18 50 12 6 52 0 65 -7 9 25 13 9 12 28 10 5 52 .. .. .. 93 0 0 9 46 28 12 6 52 1 65 -8 9 52 51 9 40 5 10 33 31 .. .. .. 94 0 0 10 14 6 12 6 51 2 66 -9 10 20 29 10 7 43 11 1 9 9 27 11 95 0 0 10 41 43 12 6 51 4 66 -10 10 48 6 10 35 20 11 28 46 9 54 47 96 0 0 11 9 18 12 6 50 5 66 -11 11 15 41 11 2 55 11 56 22 10 22 22 97 0 0 11 36 51 12 6 49 6 66 -12 11 43 14 11 30 28 12 23 54 10 49 55 98 0 0 12 4 21 12 6 48 7 66 -13 12 10 44 11 57 58 12 51 24 11 17 25 99 0 0 12 31 47 12 6 46 8 67 -15 12 38 10 12 25 24 13 18 50 11 44 51 100 0 0 12 59 8 12 6 45 9 67 -16 13 5 31 12 52 45 13 46 11 12 12 14 101 0 0 13 26 25 12 6 43 10 67 -17 13 32 48 13 20 2 14 13 27 12 39 31 102 0 0 13 53 36 12 6 41 11 67 -18 13 59 59 13 47 13 14 40 37 13 6 43 103 0 0 14 20 40 12 6 39 12 67 -19 14 27 3 14 14 18 15 7 40 13 33 48 104 0 0 14 47 38 12 6 36 13 68 -20 14 54 0 14 41 15 15 34 36 14 0 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0 22 31 30 11 49 9 27 287 -20 22 37 46 22 25 14 23 17 41 21 45 26 - 99 0 0 22 8 14 11 49 5 26 288 -19 22 14 31 22 1 58 22 54 29 21 22 7 - 98 0 0 21 44 43 11 49 1 25 288 -18 21 51 0 21 38 26 22 31 1 20 58 32 - 97 0 0 21 20 55 11 48 56 24 288 -17 21 27 13 21 14 38 22 7 17 20 34 41 - 96 0 0 20 56 52 11 48 52 23 289 -16 21 3 10 20 50 34 21 43 17 20 10 34 - 95 0 0 20 32 33 11 48 48 22 289 -15 20 38 52 20 26 15 21 19 2 19 46 12 - 94 0 0 20 8 0 11 48 45 21 289 -14 20 14 19 20 1 41 20 54 32 19 21 36 - 93 0 0 19 43 12 11 48 41 20 290 -13 19 49 31 19 36 53 20 29 47 18 56 45 - 92 0 0 19 18 10 11 48 38 19 290 -12 19 24 30 19 11 51 20 4 48 18 31 40 - 91 0 0 18 52 55 11 48 34 18 291 -11 18 59 15 18 46 35 19 39 36 18 6 22 - 90 0 0 18 27 27 11 48 31 17 291 -10 18 33 48 18 21 7 19 14 10 17 40 51 - 89 0 0 18 1 46 11 48 28 16 291 -9 18 8 7 17 55 26 18 48 32 17 15 8 - 88 0 0 17 35 54 11 48 25 15 292 -8 17 42 15 17 29 33 18 22 42 16 49 13 - 87 0 0 17 9 50 11 48 23 14 292 -7 17 16 11 17 3 28 17 56 40 16 23 7 - 86 0 0 16 43 34 11 48 20 13 292 -6 16 49 56 16 37 13 17 30 27 15 56 49 - 85 0 0 16 17 9 11 48 18 12 292 -5 16 23 31 16 10 47 17 4 4 15 30 22 - 84 0 0 15 50 34 11 48 16 11 293 -4 15 56 56 15 44 12 16 37 30 15 3 45 - 83 0 0 15 23 49 11 48 14 10 293 -2 15 30 12 15 17 27 16 10 47 14 36 59 - 82 0 0 14 56 56 11 48 13 8 293 -1 15 3 19 14 50 33 15 43 56 14 10 4 - 81 0 0 14 29 55 11 48 11 7 293 0 14 36 18 14 23 32 15 16 56 13 43 1 Uncertainty in time = +/- 9 secs Prediction of 2012 Dec 17.0 Data for the target star ------------------------ * name: TYC 1897-01389-1 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 47 35.1784 DE: +24 32 21.021 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .019, .019 ) * V mag [mag]: 10.4 * B mag [mag]: 10.7 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2054) Gawain approx. diameter [km]: 21 approx. diameter ["]: .017 distance from Earth [AU]: 1.70200 * orbital information: orbit source: Preston date of fit: 2012 Dec 16 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1079 number of rejected observations: 31 time covered by the observations: 1954 Jul 03 - 2012 Dec 08 1 sigma uncertainty ellipse (major, minor, PA): 0.076, 0.050, 98° remarks: * orbital elements for (2054) Gawain : Mean anomaly = 344.82041089 deg Arg. of pericenter = 183.60209196 deg Long. of node = 293.26834718 deg Inclination = 3.78874834 deg Eccentricity = 0.10055824 Semimajor axis = 2.96576974 AU Perihelion dist = 2.66753715 AU Mag: H = 12.44, G = 0.15 Epoch of elements : MJD 56286.49900000 TDT (2012 Dec 25.499) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 25 2054 Gawain 11h 57.5m UT 10.4 6 47 35.178 24 32 21.02TYC 1897-01389-1 10.7 15.6 21 1.9 1.702 -2.376 -0.66 -171.8790 24.540 0.70 -23.37 11.9582 -0.00502 0.19474 -6.27175 -0.12823 -0.00070 -0.00010 2000 343.56627520121219.00000183.602092293.268347 3.7887480.10055824 2.9657697 2.667537212.0 5.00.15 RATE 1.9297370 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.078 0.053 98 4.18 0.054 0 0 4 1 056278.0020121225_1389-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Dec 16, 19:13 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org