IOTA/IOTA-ES occultation update for (1585) Union / TYC 4879-00506-1 event on 2024 Jan 12, 15:31 UT Visible from Summary ------- On 2024 Jan 12 UT, the 51.6177507589369 km diameter asteroid (1585) Union will occult a 9.0 mag star in the constellation Hydra for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.96 mag to 13.98 mag (the magnitude of the asteroid) for at most 4.540 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: 84 * date and approx. time of event: 2024 Jan 12, 15:22 - 2024 Jan 12, 15:40 * geocentric midpoint of event [JD]: 2460322.14673130 * magnitude of target star: 9.03 * magnitude drop [mag]: 4.96 * estimated maximum duration [s]: 4.540 * Moon: 2 % sunlit, 155° distance * Sun: 147° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 55 * 1 sigma uncertainty interval [path widths]: +/- 0.62 * 1 sigma uncertainty interval [seconds]: +/- 1.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.032, +/- 0.009) * 1 sigma uncertainty ellipse (major, minor, PA): (0.033", 0.007", 78°) * approx speed of asteroid's shadow [km/s]: 11.4540 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 4879-00506-1 by 1585 Union on 2024 Jan 12 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 63 0 0 29 5 0 15 40 4.6 1 91 -32 29 19 49 28 50 10 29 38 3 28 31 51 .... 64 0 0 29 3 23 15 40 4.4 2 92 -33 29 18 12 28 48 32 29 36 26 28 30 13 0.26 65 0 0 29 1 2 15 40 4.0 3 92 -34 29 15 52 28 46 11 29 34 7 28 27 52 0.29 66 0 0 28 57 59 15 40 3.5 3 93 -35 29 12 50 28 43 7 29 31 5 28 24 47 0.30 67 0 0 28 54 13 15 40 2.9 4 93 -36 29 9 4 28 39 20 29 27 20 28 20 59 0.31 68 0 0 28 49 43 15 40 2.2 5 93 -37 29 4 36 28 34 50 29 22 53 28 16 28 0.31 69 0 0 28 44 31 15 40 1.3 6 94 -37 28 59 24 28 29 37 29 17 43 28 11 13 0.32 70 0 0 28 38 35 15 40 0.3 7 94 -38 28 53 30 28 23 40 29 11 50 28 5 15 0.32 71 0 0 28 31 56 15 39 59.1 8 95 -39 28 46 52 28 16 59 29 5 14 27 58 33 0.32 72 0 0 28 24 34 15 39 57.8 9 95 -40 28 39 31 28 9 35 28 57 55 27 51 7 0.32 73 0 0 28 16 28 15 39 56.3 10 96 -41 28 31 27 28 1 27 28 49 52 27 42 57 0.32 74 0 0 28 7 38 15 39 54.7 11 96 -42 28 22 38 27 52 35 28 41 6 27 34 2 0.32 75 0 0 27 58 3 15 39 53.0 11 97 -43 28 13 6 27 42 59 28 31 36 27 24 24 0.32 76 0 0 27 47 45 15 39 51.1 12 97 -43 28 2 50 27 32 38 28 21 23 27 14 0 0.32 77 0 0 27 36 41 15 39 49.1 13 98 -44 27 51 49 27 21 33 28 10 25 27 2 51 0.32 78 0 0 27 24 53 15 39 46.9 14 98 -45 27 40 3 27 9 42 27 58 42 26 50 57 0.32 79 0 0 27 12 20 15 39 44.6 15 98 -46 27 27 32 26 57 6 27 46 14 26 38 18 0.32 80 0 0 26 59 1 15 39 42.1 16 99 -47 27 14 16 26 43 44 27 33 2 26 24 53 0.32 81 0 0 26 44 56 15 39 39.5 17 99 -48 27 0 14 26 29 36 27 19 3 26 10 41 0.32 82 0 0 26 30 4 15 39 36.7 18 100 -49 26 45 26 26 14 41 27 4 19 25 55 42 0.32 83 0 0 26 14 26 15 39 33.7 19 100 -50 26 29 51 25 59 0 26 48 49 25 39 57 0.32 84 0 0 25 58 1 15 39 30.6 20 101 -50 26 13 30 25 42 31 26 32 31 25 23 24 0.32 85 0 0 25 40 49 15 39 27.3 20 101 -51 25 56 21 25 25 15 26 15 27 25 6 3 0.32 86 0 0 25 22 48 15 39 23.9 21 101 -52 25 38 24 25 7 11 25 57 35 24 47 54 0.32 87 0 0 25 3 59 15 39 20.3 22 102 -53 25 19 39 24 48 18 25 38 54 24 28 56 0.32 88 0 0 24 44 21 15 39 16.5 23 102 -54 25 0 5 24 28 35 25 19 26 24 9 9 0.32 89 0 0 24 23 54 15 39 12.6 24 102 -55 24 39 42 24 8 4 24 59 8 23 48 32 0.32 90 0 0 24 2 36 15 39 8.4 25 103 -56 24 18 29 23 46 42 24 38 1 23 27 4 0.32 91 0 0 23 40 29 15 39 4.1 26 103 -56 23 56 26 23 24 30 24 16 3 23 4 46 0.32 92 0 0 23 17 30 15 38 59.6 27 103 -57 23 33 32 23 1 26 23 53 15 22 41 37 0.32 93 0 0 22 53 40 15 38 55.0 28 104 -58 23 9 47 22 37 31 23 29 36 22 17 36 0.32 94 0 0 22 28 58 15 38 50.1 29 104 -59 22 45 10 22 12 44 23 5 5 21 52 42 0.32 95 0 0 22 3 23 15 38 45.0 30 104 -60 22 19 41 21 47 4 22 39 43 21 26 55 0.32 96 0 0 21 36 56 15 38 39.8 31 104 -61 21 53 19 21 20 31 22 13 27 21 0 16 0.32 97 0 0 21 9 34 15 38 34.3 32 105 -62 21 26 3 20 53 4 21 46 18 20 32 42 0.32 98 0 0 20 41 19 15 38 28.7 33 105 -63 20 57 53 20 24 43 21 18 16 20 4 13 0.32 99 0 0 20 12 9 15 38 22.8 34 105 -63 20 28 49 19 55 27 20 49 19 19 34 50 0.32 100 0 0 19 42 3 15 38 16.8 35 105 -64 19 58 50 19 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1 59 11 25 19 12 24 29 11 2 40 0.32 114 0 0 10 59 58 15 36 28.5 50 104 -73 11 18 24 10 41 28 11 41 4 10 18 39 0.32 115 0 0 10 15 15 15 36 19.0 51 104 -73 10 33 50 9 56 38 10 56 40 9 33 38 0.32 116 0 0 9 29 33 15 36 9.3 52 103 -73 9 48 16 9 10 47 10 11 16 8 47 37 0.32 117 0 0 8 42 51 15 35 59.3 53 103 -73 9 1 42 8 23 57 9 24 52 8 0 36 0.32 118 0 0 7 55 9 15 35 49.1 54 102 -73 8 14 9 7 36 7 8 37 29 7 12 36 0.32 119 0 0 7 6 28 15 35 38.7 55 101 -73 7 25 37 6 47 17 7 49 7 6 23 36 0.32 120 0 0 6 16 49 15 35 28.0 56 100 -73 6 36 6 5 57 29 6 59 47 5 33 37 0.32 121 0 0 5 26 11 15 35 17.1 58 100 -72 5 45 37 5 6 43 6 9 29 4 42 40 0.33 122 0 0 4 34 36 15 35 6.0 59 99 -72 4 54 10 4 14 59 5 18 13 3 50 45 0.33 123 0 0 3 42 4 15 34 54.6 60 97 -71 4 1 47 3 22 18 4 26 0 2 57 54 0.33 124 0 0 2 48 37 15 34 43.1 61 96 -71 3 8 28 2 28 42 3 32 52 2 4 6 0.33 125 0 0 1 54 14 15 34 31.3 62 95 -70 2 14 15 1 34 11 2 38 49 1 9 24 0.33 126 0 0 0 58 58 15 34 19.3 63 93 -69 1 19 7 0 38 46 1 43 52 0 13 48 0.33 127 0 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Uncertainty in time = +/- 3 secs Prediction of 2023 Jul 12.0 Data for the target star ------------------------ * name: TYC 4879-00506-1 * constellation : Hydra * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 09 12 15.8067 DE: -00 26 08.179 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 09 12 15.8067 DE: -00 26 08.179 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 9.0 * B mag [mag]: 10.2 * Diameter [mas]: 0.30 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1585) Union asteroid class: approx. diameter [km]: 52 approx. diameter ["]: 0.046 distance from Earth [AU]: 1.54080 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#66 date of fit: 2023 Apr 27 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): 0.033", 0.007", 78.11° remarks: * orbital elements for (1585)Union : Mean anomaly = 41.5931215272 deg Arg. of pericenter = 264.1380449531 deg Long. of node = 150.0770194144 deg Inclination = 26.1779610737 deg Eccentricity = 0.3088080338 Semimajor axis = 2.9285623068 AU Perihelion dist = 2.0241987389 AU Mag: H = 10.37, G = 0.15 Epoch of elements : MJD 60321.64673133 TDT (2024 Jan 12.6467) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#662023Apr27,4.54,2024,1,12,15.521551,-0.236477,-0.215773,-4.357474,4.775817,-0.002262,0.002206,0.000001,0.000000 153.9226,-0.5343,-50.78,-21.66,False TYC 4879-00506-1,9.20439075,-0.4356051,10.15,9.03,8.43,0.3,0,,9.22512326,-0.5343138,4.97,5.12,0,0,0 1585,Union,13.98,51.953,1.5408,0,0,-1.658,27.27,,2.8,0 0,41.4659,2024,1,12,264.1380,150.0770,26.1780,0.30881,2.92856,2.02420,10.37,5.0,0.15 1.616,0.0330,0.0067,78,0.0286,Known errors,0.94,0,-1,-1 20240112_0506-1,60137.01 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 12, 00:17 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org