IOTA/IOTA-ES occultation update for (6891) Triconia / TYC 6333-00074-1 event on 2024 Oct 28, 12:53 UT Visible from Summary ------- On 2024 Oct 28 UT, the 8.359 km diameter asteroid (6891) Triconia will occult a 11.6 mag star in the constellation Capricornus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 6.76 mag to 18.36 mag (the magnitude of the asteroid) for at most 0.450 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: 94 * date and approx. time of event: 2024 Oct 28, 12:49 - 2024 Oct 28, 12:58 * geocentric midpoint of event [JD]: 2460612.03746208 * magnitude of target star: 11.60 * magnitude drop [mag]: 6.76 * estimated maximum duration [s]: 0.450 * Moon: 14 % sunlit, 133° distance * Sun: 89° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 10 * 1 sigma uncertainty interval [path widths]: +/- 0.46 * 1 sigma uncertainty interval [seconds]: +/- 1.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.013, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.013", 0.002", 82°) * approx speed of asteroid's shadow [km/s]: 18.4355 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6333-00074-1 by 6891 Triconia on 2024 Oct 28 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 - 28 0 0 -40 37 6 12 49 20.1 1 113 61 -40 40 12 -40 34 1 -40 43 4 -40 31 9 .... - 27 0 0 -40 56 52 12 49 20.3 2 112 61 -40 59 58 -40 53 47 -41 2 49 -40 50 55 0.66 - 26 0 0 -41 16 31 12 49 20.5 2 111 61 -41 19 36 -41 13 25 -41 22 28 -41 10 34 0.70 - 25 0 0 -41 36 1 12 49 20.8 3 111 61 -41 39 7 -41 32 56 -41 41 58 -41 30 5 0.71 - 24 0 0 -41 55 24 12 49 21.2 4 110 61 -41 58 29 -41 52 18 -42 1 21 -41 49 27 0.72 - 23 0 0 -42 14 37 12 49 21.7 5 109 61 -42 17 43 -42 11 32 -42 20 34 -42 8 41 0.73 - 22 0 0 -42 33 42 12 49 22.3 6 109 60 -42 36 47 -42 30 37 -42 39 38 -42 27 46 0.73 - 21 0 0 -42 52 37 12 49 22.9 6 108 60 -42 55 42 -42 49 32 -42 58 33 -42 46 41 0.74 - 20 0 0 -43 11 22 12 49 23.6 7 107 60 -43 14 27 -43 8 17 -43 17 18 -43 5 27 0.74 - 19 0 0 -43 29 57 12 49 24.4 8 107 60 -43 33 2 -43 26 52 -43 35 53 -43 24 2 0.74 - 18 0 0 -43 48 22 12 49 25.3 9 106 60 -43 51 27 -43 45 17 -43 54 17 -43 42 27 0.74 - 17 0 0 -44 6 35 12 49 26.3 10 105 59 -44 9 40 -44 3 31 -44 12 31 -44 0 41 0.74 - 16 0 0 -44 24 38 12 49 27.3 10 105 59 -44 27 43 -44 21 34 -44 30 33 -44 18 44 0.74 - 15 0 0 -44 42 29 12 49 28.4 11 104 59 -44 45 34 -44 39 25 -44 48 24 -44 36 35 0.75 - 14 0 0 -45 0 9 12 49 29.6 12 103 58 -45 3 13 -44 57 5 -45 6 3 -44 54 15 0.75 - 13 0 0 -45 17 36 12 49 30.8 13 102 58 -45 20 40 -45 14 32 -45 23 30 -45 11 43 0.75 - 12 0 0 -45 34 51 12 49 32.1 13 102 58 -45 37 55 -45 31 47 -45 40 45 -45 28 58 0.75 - 11 0 0 -45 51 54 12 49 33.5 14 101 57 -45 54 57 -45 48 50 -45 57 47 -45 46 1 0.75 - 10 0 0 -46 8 43 12 49 34.9 15 100 57 -46 11 47 -46 5 40 -46 14 36 -46 2 51 0.75 - 9 0 0 -46 25 20 12 49 36.4 16 99 56 -46 28 23 -46 22 17 -46 31 13 -46 19 29 0.75 - 8 0 0 -46 41 44 12 49 38.0 16 99 56 -46 44 47 -46 38 41 -46 47 36 -46 35 53 0.75 - 7 0 0 -46 57 54 12 49 39.6 17 98 56 -47 0 57 -46 54 52 -47 3 45 -46 52 3 0.75 - 6 0 0 -47 13 51 12 49 41.3 18 97 55 -47 16 53 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25 39 -32 34 37 -32 22 49 0.82 167 0 0 -32 8 8 12 58 30.3 7 254 -44 -32 11 12 -32 5 4 -32 14 2 -32 2 15 0.83 168 0 0 -31 47 39 12 58 31.1 6 253 -44 -31 50 43 -31 44 36 -31 53 33 -31 41 46 0.84 169 0 0 -31 27 17 12 58 31.8 5 253 -45 -31 30 20 -31 24 13 -31 33 9 -31 21 24 0.85 170 0 0 -31 7 0 12 58 32.4 4 252 -45 -31 10 4 -31 3 57 -31 12 53 -31 1 8 0.87 171 0 0 -30 46 51 12 58 32.9 3 251 -45 -30 49 54 -30 43 48 -30 52 43 -30 41 0 0.91 172 0 0 -30 26 50 12 58 33.2 3 251 -45 -30 29 53 -30 23 47 -30 32 42 -30 20 59 0.96 173 0 0 -30 6 57 12 58 33.5 2 250 -45 -30 9 59 -30 3 54 -30 12 48 -30 1 6 1.08 174 0 0 -29 47 12 12 58 33.6 1 250 -45 -29 50 15 -29 44 10 -29 53 3 -29 41 22 1.52 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: TYC 6333-00074-1 * constellation : Capricornus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 20 24 06.6681 DE: -17 45 29.842 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 20 24 06.6680 DE: -17 45 29.842 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.6 * B mag [mag]: 12.1 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (6891) Triconia asteroid class: approx. diameter [km]: 8 approx. diameter ["]: 0.005 distance from Earth [AU]: 2.37650 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#49 date of fit: 2023 Apr 25 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", 82.196° remarks: * orbital elements for (6891)Triconia : Mean anomaly = 323.1209108502 deg Arg. of pericenter = 207.6998584644 deg Long. of node = 160.5557218416 deg Inclination = 5.9783792585 deg Eccentricity = 0.0614832762 Semimajor axis = 2.6850915715 AU Perihelion dist = 2.5200033448 AU Mag: H = 13.35, G = 0.15 Epoch of elements : MJD 60611.53746171 TDT (2024 Oct 28.5375) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#492023Apr25,0.45,2024,10,28,12.899090,0.060039,-0.595138,10.352733,1.046507,0.005604,0.001363,0.000000,0.000000 75.5330,-17.6788,-17.55,-13.39,False TYC 6333-00074-1,20.40185227,-17.7582894,12.10,11.60,11.33,0.0,0,,20.42539667,-17.6788331,6.76,6.58,0,0,0 6891,Triconia,18.36,8.359,2.3765,0,0,2.681,3.88,,0.8,0 0,323.0005,2024,10,28,207.6999,160.5557,5.9784,0.06148,2.68509,2.52000,13.35,5.0,0.15 1.461,0.0133,0.0022,82,0.0023,Known errors,1.18,0,-1,-1 20241028_0074-1,60140.66 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:56 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org