IOTA/IOTA-ES occultation update for (1677) Tycho / TYC 7381-00894-1 event on 2024 Oct 09, 21:12 UT Visible from Summary ------- On 2024 Oct 09 UT, the 11.762 km diameter asteroid (1677) Tycho will occult a 10.8 mag star in the constellation Scorpius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.72 mag to 16.54 mag (the magnitude of the asteroid) for at most 0.390 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: 98 * date and approx. time of event: 2024 Oct 09, 21:09 - 2024 Oct 09, 21:16 * geocentric midpoint of event [JD]: 2460593.38393963 * magnitude of target star: 10.83 * magnitude drop [mag]: 5.72 * estimated maximum duration [s]: 0.390 * Moon: 40 % sunlit, 9° distance * Sun: 71° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 12 * 1 sigma uncertainty interval [path widths]: +/- 0.35 * 1 sigma uncertainty interval [seconds]: +/- 0.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.013, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.013", 0.002", 85°) * approx speed of asteroid's shadow [km/s]: 30.2274 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7381-00894-1 by 1677 Tycho on 2024 Oct 9 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 -162 0 0 - 4 36 53 21 9 23.0 0 124 69 - 4 40 45 - 4 33 2 - 4 43 26 - 4 30 20 .... -161 0 0 - 5 16 45 21 9 23.1 2 124 70 - 5 20 36 - 5 12 54 - 5 23 17 - 5 10 13 0.03 -160 0 0 - 5 56 14 21 9 23.3 3 124 71 - 6 0 4 - 5 52 23 - 6 2 44 - 5 49 43 -0.03 -159 0 0 - 6 35 18 21 9 23.5 4 123 72 - 6 39 7 - 6 31 28 - 6 41 47 - 6 28 48 -0.06 -158 0 0 - 7 13 56 21 9 23.9 5 123 73 - 7 17 45 - 7 10 7 - 7 20 24 - 7 7 27 -0.07 -157 0 0 - 7 52 7 21 9 24.3 6 123 74 - 7 55 56 - 7 48 19 - 7 58 35 - 7 45 40 -0.08 -156 0 0 - 8 29 51 21 9 24.9 8 123 75 - 8 33 39 - 8 26 4 - 8 36 18 - 8 23 25 -0.09 -155 0 0 - 9 7 7 21 9 25.5 9 123 76 - 9 10 54 - 9 3 20 - 9 13 32 - 9 0 42 -0.09 -154 0 0 - 9 43 53 21 9 26.2 10 123 76 - 9 47 39 - 9 40 7 - 9 50 17 - 9 37 29 -0.09 -153 0 0 -10 20 9 21 9 27.0 11 123 77 -10 23 54 -10 16 23 -10 26 31 -10 13 46 -0.10 -152 0 0 -10 55 53 21 9 27.8 12 122 78 -10 59 38 -10 52 9 -11 2 15 -10 49 32 -0.10 -151 0 0 -11 31 6 21 9 28.8 13 122 79 -11 34 50 -11 27 23 -11 37 26 -11 24 46 -0.10 -150 0 0 -12 5 47 21 9 29.8 15 122 79 -12 9 30 -12 2 4 -12 12 5 -11 59 28 -0.10 -149 0 0 -12 39 55 21 9 30.9 16 122 80 -12 43 37 -12 36 12 -12 46 12 -12 33 37 -0.10 -148 0 0 -13 13 29 21 9 32.1 17 122 80 -13 17 10 -13 9 47 -13 19 44 -13 7 13 -0.11 -147 0 0 -13 46 28 21 9 33.3 18 121 81 -13 50 9 -13 42 48 -13 52 43 -13 40 14 -0.11 -146 0 0 -14 18 54 21 9 34.6 19 121 81 -14 22 34 -14 15 14 -14 25 7 -14 12 41 -0.11 -145 0 0 -14 50 44 21 9 36.0 20 121 81 -14 54 23 -14 47 5 -14 56 56 -14 44 32 -0.11 -144 0 0 -15 21 59 21 9 37.4 21 121 81 -15 25 37 -15 18 21 -15 28 9 -15 15 49 -0.11 -143 0 0 -15 52 38 21 9 39.0 22 120 81 -15 56 16 -15 49 1 -15 58 47 -15 46 29 -0.11 -142 0 0 -16 22 41 21 9 40.5 23 120 80 -16 26 18 -16 19 5 -16 28 49 -16 16 34 -0.11 -141 0 0 -16 52 8 21 9 42.2 24 120 80 -16 55 44 -16 48 32 -16 58 14 -16 46 2 -0.11 -140 0 0 -17 20 58 21 9 43.8 26 120 79 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51 -18 9 28 -17 57 21 -0.12 - 44 0 0 -17 35 18 21 14 31.0 61 231 -5 -17 38 53 -17 31 43 -17 41 23 -17 29 13 -0.12 - 43 0 0 -17 6 34 21 14 34.5 60 231 -6 -17 10 9 -17 2 58 -17 12 40 -17 0 28 -0.12 - 42 0 0 -16 37 12 21 14 38.0 59 231 -7 -16 40 48 -16 33 35 -16 43 19 -16 31 4 -0.12 - 41 0 0 -16 7 13 21 14 41.4 58 231 -9 -16 10 50 -16 3 35 -16 13 22 -16 1 4 -0.12 - 40 0 0 -15 36 36 21 14 44.9 57 231 -10 -15 40 14 -15 32 58 -15 42 47 -15 30 26 -0.12 - 39 0 0 -15 5 23 21 14 48.3 56 231 -11 -15 9 2 -15 1 44 -15 11 35 -14 59 11 -0.12 - 38 0 0 -14 33 34 21 14 51.7 55 231 -12 -14 37 13 -14 29 54 -14 39 47 -14 27 20 -0.12 - 37 0 0 -14 1 8 21 14 55.0 53 231 -13 -14 4 49 -13 57 27 -14 7 22 -13 54 53 -0.12 - 36 0 0 -13 28 6 21 14 58.4 52 231 -14 -13 31 48 -13 24 25 -13 34 22 -13 21 50 -0.12 - 35 0 0 -12 54 30 21 15 1.7 51 231 -15 -12 58 12 -12 50 47 -13 0 47 -12 48 12 -0.12 - 34 0 0 -12 20 18 21 15 5.0 50 231 -16 -12 24 2 -12 16 35 -12 26 37 -12 13 59 -0.12 - 33 0 0 -11 45 33 21 15 8.2 49 231 -17 -11 49 17 -11 41 49 -11 51 53 -11 39 12 -0.12 - 32 0 0 -11 10 13 21 15 11.4 48 231 -18 -11 13 58 -11 6 29 -11 16 35 -11 3 52 -0.12 - 31 0 0 -10 34 21 21 15 14.6 47 231 -19 -10 38 7 -10 30 36 -10 40 44 -10 27 58 -0.12 - 30 0 0 - 9 57 57 21 15 17.7 46 231 -20 -10 1 43 - 9 54 10 -10 4 21 - 9 51 32 -0.12 - 29 0 0 - 9 21 1 21 15 20.8 44 231 -21 - 9 24 48 - 9 17 14 - 9 27 27 - 9 14 35 -0.12 - 28 0 0 - 8 43 34 21 15 23.8 43 231 -23 - 8 47 22 - 8 39 46 - 8 50 1 - 8 37 7 -0.12 - 27 0 0 - 8 5 38 21 15 26.8 42 231 -24 - 8 9 27 - 8 1 49 - 8 12 6 - 7 59 10 -0.12 - 26 0 0 - 7 27 13 21 15 29.7 41 231 -25 - 7 31 2 - 7 23 23 - 7 33 42 - 7 20 43 -0.12 - 25 0 0 - 6 48 20 21 15 32.6 40 231 -26 - 6 52 10 - 6 44 29 - 6 54 50 - 6 41 49 -0.12 - 24 0 0 - 6 9 0 21 15 35.4 39 231 -27 - 6 12 50 - 6 5 9 - 6 15 31 - 6 2 28 -0.12 - 23 0 0 - 5 29 14 21 15 38.1 37 231 -28 - 5 33 5 - 5 25 22 - 5 35 47 - 5 22 41 -0.12 - 22 0 0 - 4 49 3 21 15 40.8 36 231 -29 - 4 52 56 - 4 45 11 - 4 55 37 - 4 42 29 -0.12 - 21 0 0 - 4 8 30 21 15 43.4 35 231 -30 - 4 12 22 - 4 4 37 - 4 15 5 - 4 1 55 -0.12 - 20 0 0 - 3 27 34 21 15 45.9 34 231 -31 - 3 31 27 - 3 23 40 - 3 34 10 - 3 20 58 -0.12 - 19 0 0 - 2 46 17 21 15 48.4 32 231 -33 - 2 50 11 - 2 42 23 - 2 52 54 - 2 39 40 -0.11 - 18 0 0 - 2 4 41 21 15 50.8 31 231 -34 - 2 8 35 - 2 0 46 - 2 11 18 - 1 58 3 -0.11 - 17 0 0 - 1 22 46 21 15 53.1 30 231 -35 - 1 26 41 - 1 18 51 - 1 29 25 - 1 16 7 -0.11 - 16 0 0 - 0 40 35 21 15 55.4 29 231 -36 - 0 44 30 - 0 36 40 - 0 47 14 - 0 33 55 -0.11 - 15 0 0 0 1 51 21 15 57.5 28 231 -37 - 0 2 4 0 5 47 - 0 4 49 0 8 32 -0.11 - 14 0 0 0 44 31 21 15 59.6 26 231 -38 0 40 35 0 48 28 0 37 51 0 51 13 -0.11 - 13 0 0 1 27 24 21 16 1.6 25 231 -39 1 23 27 1 31 20 1 20 42 1 34 5 -0.11 - 12 0 0 2 10 27 21 16 3.5 24 231 -40 2 6 30 2 14 23 2 3 44 2 17 9 -0.11 - 11 0 0 2 53 38 21 16 5.3 23 232 -41 2 49 41 2 57 36 2 46 56 3 0 21 -0.11 - 10 0 0 3 36 57 21 16 7.0 21 232 -42 3 33 0 3 40 55 3 30 14 3 43 41 -0.11 - 9 0 0 4 20 22 21 16 8.6 20 232 -43 4 16 25 4 24 20 4 13 39 4 27 6 -0.11 - 8 0 0 5 3 51 21 16 10.2 19 232 -45 4 59 53 5 7 49 4 57 8 5 10 35 -0.11 - 7 0 0 5 47 23 21 16 11.6 18 232 -46 5 43 25 5 51 21 5 40 39 5 54 7 -0.11 - 6 0 0 6 30 55 21 16 13.0 17 232 -47 6 26 57 6 34 53 6 24 11 6 37 39 -0.11 - 5 0 0 7 14 26 21 16 14.2 15 232 -48 7 10 28 7 18 24 7 7 42 7 21 11 -0.11 - 4 0 0 7 57 55 21 16 15.4 14 232 -49 7 53 57 8 1 53 7 51 11 8 4 39 -0.11 - 3 0 0 8 41 19 21 16 16.4 13 232 -50 8 37 21 8 45 18 8 34 35 8 48 4 -0.11 - 2 0 0 9 24 38 21 16 17.4 12 233 -51 9 20 40 9 28 36 9 17 54 9 31 22 -0.11 - 1 0 0 10 7 49 21 16 18.2 10 233 -52 10 3 51 10 11 47 10 1 5 10 14 33 -0.11 0 0 0 10 50 51 21 16 19.0 9 233 -53 10 46 53 10 54 49 10 44 7 10 57 35 -0.10 1 0 0 11 33 43 21 16 19.7 8 233 -53 11 29 45 11 37 41 11 26 59 11 40 27 -0.10 2 0 0 12 16 22 21 16 20.2 7 233 -54 12 12 25 12 20 20 12 9 39 12 23 6 -0.10 3 0 0 12 58 48 21 16 20.7 6 234 -55 12 54 51 13 2 45 12 52 5 13 5 31 -0.10 4 0 0 13 40 59 21 16 21.1 4 234 -56 13 37 2 13 44 56 13 34 16 13 47 41 -0.09 5 0 0 14 22 53 21 16 21.4 3 234 -57 14 18 56 14 26 50 14 16 11 14 29 35 -0.08 6 0 0 15 4 29 21 16 21.6 2 234 -58 15 0 33 15 8 26 14 57 48 15 11 10 -0.06 7 0 0 15 45 46 21 16 21.7 1 235 -59 15 41 50 15 49 42 15 39 6 15 52 27 0.03 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: TYC 7381-00894-1 * constellation : Scorpius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 45 30.8494 DE: -33 36 26.234 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 45 30.8492 DE: -33 36 26.234 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 10.8 * B mag [mag]: 11.2 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1677) Tycho asteroid class: approx. diameter [km]: 12 approx. diameter ["]: 0.007 distance from Earth [AU]: 2.38950 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): 0.013", 0.002", 85.03° remarks: * orbital elements for (1677)Tycho : Mean anomaly = 356.3614529340 deg Arg. of pericenter = 317.6531025605 deg Long. of node = 337.8658115367 deg Inclination = 14.8581379628 deg Eccentricity = 0.1069483671 Semimajor axis = 2.5321360134 AU Perihelion dist = 2.2613282015 AU Mag: H = 11.74, G = 0.15 Epoch of elements : MJD 60592.88393950 TDT (2024 Oct 09.8839) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#502023Apr24,0.39,2024,10,9,21.214551,-0.026395,0.121408,16.668439,3.639649,0.005181,-0.000452,-0.000001,0.000000 -70.4100,-33.6190,-141.46,-6.71,False TYC 7381-00894-1,17.75856933,-33.6072874,11.15,10.83,10.66,0.0,0,,17.78560207,-33.6189992,5.71,5.44,0,0,0 1677,Tycho,16.54,11.762,2.3895,0,0,4.912,13.40,,1.2,0 0,356.1452,2024,10,9,317.6531,337.8658,14.8581,0.10695,2.53214,2.26133,11.73,5.0,0.15 1.349,0.0127,0.0018,85,0.0024,Known errors,0.69,0,-1,-1 20241009_0894-1,60140.62 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 14:56 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org