IOTA/IOTA-ES occultation update for (1677) Tycho / UCAC4 291-181398 event on 2024 Oct 27, 12:42 UT Visible from Summary ------- On 2024 Oct 27 UT, the 11.619177457586 km diameter asteroid (1677) Tycho will occult a 11.6 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.01 mag to 16.63 mag (the magnitude of the asteroid) for at most 0.340 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: 99 * date and approx. time of event: 2024 Oct 27, 12:39 - 2024 Oct 27, 12:45 * geocentric midpoint of event [JD]: 2460611.02967779 * magnitude of target star: 11.63 * magnitude drop [mag]: 5.01 * estimated maximum duration [s]: 0.340 * Moon: 21 % sunlit, 115° distance * Sun: 61° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 12 * 1 sigma uncertainty interval [path widths]: +/- 0.28 * 1 sigma uncertainty interval [seconds]: +/- 0.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.012, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.012", 0.002", 79°) * approx speed of asteroid's shadow [km/s]: 35.0237 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 291-181398 by 1677 Tycho on 2024 Oct 27 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 - 43 0 0 - 4 46 35 12 39 43.9 0 122 60 - 4 50 23 - 4 42 46 - 4 52 32 - 4 40 37 .... - 42 0 0 - 5 23 54 12 39 44.0 2 122 61 - 5 27 42 - 5 20 6 - 5 29 51 - 5 17 57 0.02 - 41 0 0 - 6 0 49 12 39 44.2 3 122 62 - 6 4 36 - 5 57 2 - 6 6 45 - 5 54 53 -0.05 - 40 0 0 - 6 37 19 12 39 44.4 4 122 64 - 6 41 6 - 6 33 32 - 6 43 14 - 6 31 24 -0.07 - 39 0 0 - 7 13 23 12 39 44.7 5 122 65 - 7 17 9 - 7 9 37 - 7 19 17 - 7 7 29 -0.09 - 38 0 0 - 7 49 0 12 39 45.1 6 121 66 - 7 52 45 - 7 45 15 - 7 54 53 - 7 43 7 -0.10 - 37 0 0 - 8 24 9 12 39 45.5 7 121 67 - 8 27 54 - 8 20 25 - 8 30 1 - 8 18 18 -0.10 - 36 0 0 - 8 58 50 12 39 46.0 9 121 68 - 9 2 34 - 8 55 6 - 9 4 41 - 8 53 0 -0.11 - 35 0 0 - 9 33 2 12 39 46.6 10 121 69 - 9 36 45 - 9 29 19 - 9 38 51 - 9 27 12 -0.11 - 34 0 0 -10 6 44 12 39 47.3 11 121 70 -10 10 26 -10 3 1 -10 12 32 -10 0 55 -0.11 - 33 0 0 -10 39 55 12 39 48.0 12 121 71 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18 9 15 0.38 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 291-181398 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 21 09.3121 DE: -31 56 06.151 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 21 09.3120 DE: -31 56 06.151 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.6 * B mag [mag]: 12.4 * Diameter [mas]: 0.10 * 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]: 2.57590 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", 79.215° remarks: * orbital elements for (1677)Tycho : Mean anomaly = 0.6781564361 deg Arg. of pericenter = 317.6529991406 deg Long. of node = 337.8654298232 deg Inclination = 14.8582387896 deg Eccentricity = 0.1069333648 Semimajor axis = 2.5320935555 AU Perihelion dist = 2.2613282715 AU Mag: H = 11.74, G = 0.15 Epoch of elements : MJD 60610.52967750 TDT (2024 Oct 27.5297) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#502023Apr24,0.34,2024,10,27,12.712267,-0.032800,0.136298,19.234368,4.563724,0.004890,-0.000218,-0.000001,0.000000 48.6362,-31.9253,-14.73,-13.05,False UCAC4 291-181398,18.35258675,-31.9350420,12.44,11.63,11.19,0.1,0,,18.37923073,-31.9252863,5.02,5.00,0,0,0 1677,Tycho,16.63,11.806,2.5759,0,0,5.158,15.59,,1.2,0 0,0.5486,2024,10,27,317.6530,337.8654,14.8582,0.10693,2.53209,2.26133,11.73,5.0,0.15 1.283,0.0120,0.0017,79,0.0018,Known errors,0.77,0,-1,-1 20241027_181398,60140.66 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:53 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org