IOTA/IOTA-ES occultation update for (1677) Tycho / UCAC4 299-080152 event on 2024 Jan 21, 00:15 UT Visible from Summary ------- On 2024 Jan 21 UT, the 11.791 km diameter asteroid (1677) Tycho will occult a 11.9 mag star in the constellation Lupus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.04 mag to 16.89 mag (the magnitude of the asteroid) for at most 0.360 seconds. This update is based on, astrometry for the asteroid kindly provided by the IAU Minor Planet Center. This work has made use of data from the European Space Agency (ESA) mission Gaia (http://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, http://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. The event at a glimpse ---------------------- * Rank: 96 * date and approx. time of event: 2024 Jan 21, 00:12 - 2024 Jan 21, 00:17 * geocentric midpoint of event [JD]: 2460330.51044513 * magnitude of target star: 11.86 * magnitude drop [mag]: 5.04 * estimated maximum duration [s]: 0.360 * Moon: 78 % sunlit, 169° distance * Sun: 64° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 14 * 1 sigma uncertainty interval [path widths]: +/- 0.41 * 1 sigma uncertainty interval [seconds]: +/- 0.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.011, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.012", 0.002", 109°) * approx speed of asteroid's shadow [km/s]: 32.7778 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 299-080152 by 1677 Tycho on 2024 Jan 21 Centre Star Star Sun Path Limits Error Limits Alt E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 Crn o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Latitude Latitude Latitude Latitude 17 0 0 - 3 45 12 0 12 14.1 1 120 -61 - 3 49 31 - 3 40 53 - 3 53 2 - 3 37 23 .... 18 0 0 - 4 21 33 0 12 14.2 2 120 -60 - 4 25 54 - 4 17 12 - 4 29 26 - 4 13 41 0.50 19 0 0 - 4 58 45 0 12 14.4 3 120 -59 - 5 3 8 - 4 54 23 - 5 6 42 - 4 50 50 0.53 20 0 0 - 5 36 49 0 12 14.7 4 120 -58 - 5 41 14 - 5 32 25 - 5 44 49 - 5 28 50 0.55 21 0 0 - 6 15 44 0 12 15.1 5 120 -56 - 6 20 10 - 6 11 17 - 6 23 46 - 6 7 42 0.56 22 0 0 - 6 55 29 0 12 15.5 6 120 -55 - 6 59 57 - 6 51 0 - 7 3 35 - 6 47 23 0.56 23 0 0 - 7 36 4 0 12 16.1 8 120 -54 - 7 40 34 - 7 31 34 - 7 44 13 - 7 27 55 0.57 24 0 0 - 8 17 28 0 12 16.8 9 120 -53 - 8 22 0 - 8 12 56 - 8 25 41 - 8 9 16 0.57 25 0 0 - 8 59 41 0 12 17.6 10 119 -52 - 9 4 15 - 8 55 8 - 9 7 58 - 8 51 26 0.57 26 0 0 - 9 42 43 0 12 18.5 11 119 -51 - 9 47 19 - 9 38 7 - 9 51 3 - 9 34 24 0.58 27 0 0 -10 26 32 0 12 19.5 13 119 -49 -10 31 10 -10 21 54 -10 34 55 -10 18 9 0.58 28 0 0 -11 11 7 0 12 20.6 14 119 -48 -11 15 47 -11 6 28 -11 19 35 -11 2 41 0.58 29 0 0 -11 56 29 0 12 21.8 15 119 -47 -12 1 11 -11 51 47 -12 4 59 -11 47 59 0.58 30 0 0 -12 42 34 0 12 23.1 16 118 -46 -12 47 18 -12 37 51 -12 51 9 -12 34 1 0.58 31 0 0 -13 29 23 0 12 24.5 17 118 -44 -13 34 9 -13 24 38 -13 38 2 -13 20 46 0.58 32 0 0 -14 16 55 0 12 26.1 19 118 -43 -14 21 43 -14 12 7 -14 25 36 -14 8 14 0.58 33 0 0 -15 5 6 0 12 27.7 20 117 -42 -15 9 56 -15 0 17 -15 13 52 -14 56 22 0.58 34 0 0 -15 53 57 0 12 29.5 21 117 -41 -15 58 49 -15 49 5 -16 2 46 -15 45 9 0.58 35 0 0 -16 43 26 0 12 31.3 22 117 -39 -16 48 20 -16 38 32 -16 52 19 -16 34 34 0.58 36 0 0 -17 33 30 0 12 33.3 24 116 -38 -17 38 26 -17 28 34 -17 42 27 -17 24 34 0.58 37 0 0 -18 24 8 0 12 35.3 25 116 -37 -18 29 6 -18 19 10 -18 33 8 -18 15 9 0.58 38 0 0 -19 15 18 0 12 37.5 26 115 -36 -19 20 19 -19 10 18 -19 24 22 -19 6 16 0.58 39 0 0 -20 6 58 0 12 39.8 27 115 -34 -20 12 0 -20 1 56 -20 16 6 -19 57 52 0.59 40 0 0 -20 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39.1 18 241 44 -58 45 10 -58 35 29 -58 49 6 -58 31 34 0.61 -146 0 0 -58 13 24 0 17 39.9 17 240 44 -58 18 16 -58 8 32 -58 22 14 -58 4 35 0.61 -145 0 0 -57 45 42 0 17 40.7 17 239 44 -57 50 36 -57 40 47 -57 54 35 -57 36 49 0.61 -144 0 0 -57 17 12 0 17 41.5 16 238 44 -57 22 8 -57 12 16 -57 26 9 -57 8 16 0.61 -143 0 0 -56 47 54 0 17 42.3 15 237 43 -56 52 52 -56 42 56 -56 56 54 -56 38 54 0.62 -142 0 0 -56 17 47 0 17 43.0 14 236 43 -56 22 47 -56 12 47 -56 26 51 -56 8 44 0.62 -141 0 0 -55 46 50 0 17 43.8 14 236 43 -55 51 52 -55 41 48 -55 55 58 -55 37 44 0.62 -140 0 0 -55 15 3 0 17 44.5 13 235 43 -55 20 8 -55 10 0 -55 24 14 -55 5 54 0.62 -139 0 0 -54 42 26 0 17 45.2 12 234 43 -54 47 32 -54 37 21 -54 51 40 -54 33 13 0.62 -138 0 0 -54 8 58 0 17 45.8 11 233 42 -54 14 5 -54 3 50 -54 18 15 -53 59 42 0.63 -137 0 0 -53 34 38 0 17 46.4 10 232 42 -53 39 47 -53 29 29 -53 43 58 -53 25 19 0.63 -136 0 0 -52 59 26 0 17 47.0 10 231 42 -53 4 38 -52 54 16 -53 8 50 -52 50 4 0.64 -135 0 0 -52 23 23 0 17 47.5 9 231 42 -52 28 36 -52 18 11 -52 32 49 -52 13 58 0.64 -134 0 0 -51 46 27 0 17 48.1 8 230 41 -51 51 42 -51 41 13 -51 55 57 -51 36 59 0.65 -133 0 0 -51 8 40 0 17 48.5 7 229 41 -51 13 56 -51 3 24 -51 18 12 -50 59 9 0.66 -132 0 0 -50 30 0 0 17 48.9 6 228 41 -50 35 17 -50 24 43 -50 39 35 -50 20 27 0.67 -131 0 0 -49 50 29 0 17 49.3 5 227 40 -49 55 48 -49 45 11 -50 0 6 -49 40 53 0.68 -130 0 0 -49 10 7 0 17 49.6 4 227 40 -49 15 26 -49 4 47 -49 19 46 -49 0 29 0.71 -129 0 0 -48 28 53 0 17 49.9 3 226 39 -48 34 14 -48 23 33 -48 38 35 -48 19 13 0.74 -128 0 0 -47 46 50 0 17 50.1 2 225 39 -47 52 12 -47 41 28 -47 56 33 -47 37 8 0.81 -127 0 0 -47 3 57 0 17 50.2 1 224 38 -47 9 20 -46 58 35 -47 13 42 -46 54 14 0.97 -126 0 0 -46 20 16 0 17 50.3 0 224 38 -46 25 40 -46 14 53 -46 30 3 -46 10 31 2.11 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 12.0 Data for the target star ------------------------ * name: UCAC4 299-080152 * constellation : Lupus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 15 24 12.8797 DE: -30 19 09.415 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 15 24 12.8797 DE: -30 19 09.415 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.9 * B mag [mag]: 12.6 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1677) Tycho asteroid class: approx. diameter [km]: 12 approx. diameter ["]: 0.006 distance from Earth [AU]: 2.71900 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#50 date of fit: 2023 Apr 24 source of used astrometry: MPC, JPL number of used observations: 0 number of rejected observations: 0 time covered by the observations: 1800 Jan 01 - 1800 Jan 01 1 sigma uncertainty ellipse (major, minor, PA): 0.012", 0.002", 109.28° remarks: * orbital elements for (1677)Tycho : Mean anomaly = 292.0615503953 deg Arg. of pericenter = 317.6597121186 deg Long. of node = 337.8746818891 deg Inclination = 14.8580283998 deg Eccentricity = 0.1070825493 Semimajor axis = 2.5323875933 AU Perihelion dist = 2.2612130741 AU Mag: H = 11.74, G = 0.15 Epoch of elements : MJD 60330.01044513 TDT (2024 Jan 21.0104) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#502023Apr24,0.36,2024,1,21,0.250683,-0.220982,-0.450780,16.604230,-8.159396,-0.005171,0.000835,-0.000001,0.000000 107.7832,-30.4030,179.00,-20.06,False UCAC4 299-080152,15.40357764,-30.3192818,12.61,11.86,11.46,0.0,0,,15.42787745,-30.4029514,5.04,5.00,0,0,0 1677,Tycho,16.89,11.791,2.7190,0,0,4.152,-26.39,,1.2,0 0,291.8144,2024,1,20,317.6597,337.8747,14.8580,0.10708,2.53239,2.26121,11.73,5.0,0.15 1.405,0.0120,0.0020,109,0.0024,Known errors,1.01,0,-1,-1 20240121_080152,60137.02 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 12, 00:34 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org