IOTA/IOTA-ES occultation update for (74) Galatea / UCAC4 398-135655 event on 2024 Dec 04, 14:44 UT Visible from Summary ------- On 2024 Dec 04 UT, the 116.746 km diameter asteroid (74) Galatea will occult a 11.2 mag star in the constellation Aquarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.26 mag to 13.32 mag (the magnitude of the asteroid) for at most 4.280 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: 100 * date and approx. time of event: 2024 Dec 04, 14:40 - 2024 Dec 04, 14:48 * geocentric midpoint of event [JD]: 2460649.11451063 * magnitude of target star: 11.20 * magnitude drop [mag]: 2.26 * estimated maximum duration [s]: 4.280 * Moon: 12 % sunlit, 37° distance * Sun: 76° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 117 * 1 sigma uncertainty interval [path widths]: +/- 0.01 * 1 sigma uncertainty interval [seconds]: +/- 0.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.010, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.011", 0.001", 72°) * approx speed of asteroid's shadow [km/s]: 27.3077 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 398-135655 by 74 Galatea on 2024 Dec 4 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 - 56 0 0 -14 57 31 14 41 0.1 1 101 75 -15 29 44 -14 25 18 -15 30 36 -14 24 26 .... - 55 0 0 -15 8 22 14 41 0.2 2 100 76 -15 40 33 -14 36 11 -15 41 25 -14 35 19 0.03 - 54 0 0 -15 18 55 14 41 0.3 3 100 77 -15 51 4 -14 46 46 -15 51 57 -14 45 53 0.01 - 53 0 0 -15 29 10 14 41 0.5 4 100 78 -16 1 18 -14 57 2 -16 2 10 -14 56 10 0.00 - 52 0 0 -15 39 7 14 41 0.8 5 100 79 -16 11 13 -15 7 1 -16 12 5 -15 6 9 0.00 - 51 0 0 -15 48 46 14 41 1.2 5 99 80 -16 20 50 -15 16 41 -16 21 42 -15 15 49 0.00 - 50 0 0 -15 58 6 14 41 1.6 6 99 80 -16 30 9 -15 26 3 -16 31 1 -15 25 11 -0.01 - 49 0 0 -16 7 8 14 41 2.1 7 99 81 -16 39 9 -15 35 6 -16 40 1 -15 34 14 -0.01 - 48 0 0 -16 15 51 14 41 2.6 8 99 82 -16 47 51 -15 43 51 -16 48 43 -15 42 59 -0.01 - 47 0 0 -16 24 16 14 41 3.2 9 98 83 -16 56 14 -15 52 17 -16 57 6 -15 51 25 -0.01 - 46 0 0 -16 32 21 14 41 3.9 10 98 83 -17 4 18 -16 0 24 -17 5 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8 41 31 9 47 55 8 40 37 9 48 49 -0.01 92 0 0 9 33 24 14 48 17.2 29 252 -46 9 0 13 10 6 35 8 59 20 10 7 29 -0.01 93 0 0 9 51 53 14 48 19.3 28 252 -47 9 18 44 10 25 2 9 17 51 10 25 56 -0.01 94 0 0 10 10 11 14 48 21.2 27 253 -48 9 37 4 10 43 18 9 36 10 10 44 12 -0.01 95 0 0 10 28 16 14 48 23.1 26 253 -49 9 55 11 11 1 21 9 54 17 11 2 15 -0.01 96 0 0 10 46 8 14 48 24.9 25 253 -51 10 13 5 11 19 12 10 12 11 11 20 6 -0.01 97 0 0 11 3 48 14 48 26.7 24 253 -52 10 30 47 11 36 50 10 29 53 11 37 44 -0.01 98 0 0 11 21 15 14 48 28.4 23 253 -53 10 48 15 11 54 15 10 47 22 11 55 8 -0.01 99 0 0 11 38 28 14 48 30.0 22 254 -54 11 5 30 12 11 26 11 4 37 12 12 19 -0.01 100 0 0 11 55 27 14 48 31.5 21 254 -55 11 22 32 12 28 23 11 21 38 12 29 17 -0.01 101 0 0 12 12 13 14 48 33.0 20 254 -56 11 39 19 12 45 7 11 38 25 12 46 0 -0.01 102 0 0 12 28 44 14 48 34.4 19 254 -57 11 55 52 13 1 36 11 54 58 13 2 29 -0.01 103 0 0 12 45 0 14 48 35.7 18 254 -58 12 12 10 13 17 50 12 11 17 13 18 44 -0.01 104 0 0 13 1 2 14 48 36.9 17 255 -59 12 28 14 13 33 50 12 27 21 13 34 43 -0.01 105 0 0 13 16 49 14 48 38.1 16 255 -60 12 44 3 13 49 35 12 43 10 13 50 28 -0.01 106 0 0 13 32 20 14 48 39.2 15 255 -61 12 59 36 14 5 4 12 58 43 14 5 57 -0.01 107 0 0 13 47 36 14 48 40.2 14 255 -62 13 14 54 14 20 18 13 14 1 14 21 11 -0.01 108 0 0 14 2 36 14 48 41.2 13 256 -63 13 29 56 14 35 16 13 29 3 14 36 9 -0.01 109 0 0 14 17 20 14 48 42.0 12 256 -64 13 44 43 14 49 58 13 43 50 14 50 51 -0.01 110 0 0 14 31 48 14 48 42.8 11 256 -65 13 59 13 15 4 24 13 58 20 15 5 17 -0.01 111 0 0 14 46 0 14 48 43.6 10 256 -66 14 13 27 15 18 34 14 12 34 15 19 27 -0.01 112 0 0 14 59 56 14 48 44.2 9 257 -67 14 27 24 15 32 27 14 26 31 15 33 20 -0.01 113 0 0 15 13 34 14 48 44.8 8 257 -68 14 41 5 15 46 4 14 40 12 15 46 57 0.00 114 0 0 15 26 56 14 48 45.3 7 257 -69 14 54 28 15 59 24 14 53 36 16 0 17 0.00 115 0 0 15 40 1 14 48 45.8 6 257 -70 15 7 35 16 12 27 15 6 43 16 13 20 0.00 116 0 0 15 52 49 14 48 46.2 5 258 -70 15 20 25 16 25 13 15 19 32 16 26 5 0.00 117 0 0 16 5 19 14 48 46.5 4 258 -71 15 32 57 16 37 41 15 32 5 16 38 34 0.00 118 0 0 16 17 32 14 48 46.7 3 258 -72 15 45 12 16 49 53 15 44 20 16 50 45 0.01 119 0 0 16 29 28 14 48 46.9 2 258 -73 15 57 10 17 1 46 15 56 18 17 2 39 0.02 120 0 0 16 41 6 14 48 47.0 1 259 -74 16 8 50 17 13 22 16 7 57 17 14 15 0.05 121 0 0 16 52 26 14 48 47.0 0 259 -75 16 20 12 .. .. .. 16 19 19 .. .. .. 1.20 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 398-135655 * constellation : Aquarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 22 00 05.3024 DE: -10 35 34.359 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 22 00 05.3021 DE: -10 35 34.361 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 11.2 * B mag [mag]: 11.5 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (74) Galatea asteroid class: approx. diameter [km]: 117 approx. diameter ["]: 0.075 distance from Earth [AU]: 2.15830 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#122 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): 0.011", 0.001", 71.917° remarks: * orbital elements for (74)Galatea : Mean anomaly = 349.6655547915 deg Arg. of pericenter = 174.8651183132 deg Long. of node = 197.1144772205 deg Inclination = 4.0720803286 deg Eccentricity = 0.2361961608 Semimajor axis = 2.7800134003 AU Perihelion dist = 2.1233849081 AU Mag: H = 8.81, G = 0.15 Epoch of elements : MJD 60648.61451046 TDT (2024 Dec 04.6145) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1222023Apr24,4.28,2024,12,4,14.748255,-0.004411,0.017428,14.813167,4.258796,0.005097,0.001921,-0.000001,0.000000 35.2222,-10.4742,-43.61,-22.35,False UCAC4 398-135655,22.00147293,-10.5928774,11.50,11.20,11.04,0.0,0,,22.02351996,-10.4741706,2.27,2.02,0,0,0 74,Galatea,13.32,116.746,2.1583,0,0,4.093,17.36,,7.4,0 0,349.5349,2024,12,4,174.8651,197.1145,4.0721,0.23620,2.78001,2.12338,8.80,5.0,0.15 1.014,0.0107,0.0009,72,0.0010,Known errors,1.12,0,-1,-1 20241204_135655,60140.73 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 17:25 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org