IOTA/IOTA-ES occultation update for (491) Carina / UCAC4 486-027040 event on 2024 Apr 06, 13:40 UT Visible from Summary ------- On 2024 Apr 06 UT, the 99.546 km diameter asteroid (491) Carina will occult a 11.8 mag star in the constellation Monoceros for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 3.18 mag to 14.90 mag (the magnitude of the asteroid) for at most 4.560 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 Apr 06, 13:36 - 2024 Apr 06, 13:44 * geocentric midpoint of event [JD]: 2460407.07010466 * magnitude of target star: 11.78 * magnitude drop [mag]: 3.18 * estimated maximum duration [s]: 4.560 * Moon: 7 % sunlit, 113° distance * Sun: 84° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 126 * 1 sigma uncertainty interval [path widths]: +/- 0.15 * 1 sigma uncertainty interval [seconds]: +/- 1.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.018, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.018", 0.003", 88°) * approx speed of asteroid's shadow [km/s]: 21.8492 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 486-027040 by 491 Carina on 2024 Apr 6 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 - 17 0 1 -59 22 59 13 37 6.8 0 76 24 -59 58 7 -58 48 8 -60 8 58 -58 37 29 .... - 16 0 1 -59 15 9 13 37 6.8 1 75 24 -59 50 21 -58 40 14 -60 1 14 -58 29 34 0.37 - 15 0 1 -59 7 3 13 37 6.9 1 74 24 -59 42 19 -58 32 3 -59 53 12 -58 21 22 0.53 - 14 0 1 -58 58 38 13 37 7.0 2 73 24 -59 33 59 -58 23 35 -59 44 54 -58 12 52 0.60 - 13 0 1 -58 49 57 13 37 7.1 2 72 24 -59 25 22 -58 14 49 -59 36 18 -58 4 5 0.64 - 12 0 1 -58 40 57 13 37 7.3 3 72 24 -59 16 27 -58 5 45 -59 27 25 -57 54 59 0.66 - 11 0 1 -58 31 40 13 37 7.5 3 71 24 -59 7 14 -57 56 23 -59 18 14 -57 45 36 0.68 - 10 0 1 -58 22 4 13 37 7.7 4 70 24 -58 57 44 -57 46 43 -59 8 45 -57 35 54 0.69 - 9 0 1 -58 12 11 13 37 7.9 5 69 24 -58 47 55 -57 36 44 -58 58 58 -57 25 55 0.70 - 8 0 1 -58 1 59 13 37 8.2 5 68 24 -58 37 49 -57 26 28 -58 48 52 -57 15 37 0.71 - 7 0 1 -57 51 29 13 37 8.6 6 67 24 -58 27 24 -57 15 52 -58 38 29 -57 5 0 0.71 - 6 0 1 -57 40 40 13 37 8.9 6 66 24 -58 16 40 -57 4 59 -58 27 47 -56 54 5 0.72 - 5 0 1 -57 29 33 13 37 9.4 7 66 24 -58 5 38 -56 53 46 -58 16 47 -56 42 50 0.72 - 4 0 1 -57 18 7 13 37 9.8 7 65 24 -57 54 17 -56 42 15 -58 5 27 -56 31 17 0.72 - 3 0 1 -57 6 21 13 37 10.3 8 64 24 -57 42 37 -56 30 24 -57 53 49 -56 19 25 0.73 - 2 0 1 -56 54 17 13 37 10.8 8 63 24 -57 30 38 -56 18 14 -57 41 52 -56 7 14 0.73 - 1 0 1 -56 41 54 13 37 11.4 9 62 24 -57 18 20 -56 5 46 -57 29 36 -55 54 44 0.73 - 0 0 1 -56 29 11 13 37 12.0 10 61 24 -57 5 43 -55 52 57 -57 17 0 -55 41 54 0.73 0 59 59 -56 16 8 13 37 12.7 10 61 24 -56 52 46 -55 39 49 -57 4 5 -55 28 44 0.74 1 59 59 -56 2 46 13 37 13.4 11 60 24 -56 39 30 -55 26 22 -56 50 51 -55 15 15 0.74 2 59 59 -55 49 5 13 37 14.2 11 59 24 -56 25 54 -55 12 35 -56 37 17 -55 1 26 0.74 3 59 59 -55 35 3 13 37 15.0 12 58 24 -56 11 58 -54 58 28 -56 23 23 -54 47 17 0.74 4 59 59 -55 20 42 13 37 15.8 13 57 24 -55 57 43 -54 44 1 -56 9 9 -54 32 49 0.74 5 59 59 -55 6 0 13 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129 0 0 -14 32 56 13 44 31.4 17 282 -64 -15 7 14 -13 58 54 -15 17 49 -13 48 30 0.79 130 0 0 -14 31 37 13 44 33.2 16 282 -65 -15 5 55 -13 57 36 -15 16 30 -13 47 12 0.80 131 0 0 -14 30 49 13 44 34.9 15 282 -66 -15 5 6 -13 56 48 -15 15 41 -13 46 24 0.80 132 0 0 -14 30 33 13 44 36.5 14 281 -67 -15 4 49 -13 56 32 -15 15 24 -13 46 8 0.80 133 0 0 -14 30 47 13 44 38.0 13 281 -68 -15 5 3 -13 56 46 -15 15 38 -13 46 22 0.80 134 0 0 -14 31 32 13 44 39.4 12 281 -69 -15 5 48 -13 57 31 -15 16 23 -13 47 7 0.80 135 0 0 -14 32 48 13 44 40.7 11 280 -69 -15 7 4 -13 58 47 -15 17 39 -13 48 23 0.80 136 0 0 -14 34 35 13 44 41.8 10 280 -70 -15 8 51 -14 0 33 -15 19 26 -13 50 9 0.81 137 0 0 -14 36 52 13 44 42.9 9 280 -71 -15 11 10 -14 2 50 -15 21 45 -13 52 26 0.81 138 0 0 -14 39 40 13 44 43.9 8 280 -72 -15 13 58 -14 5 38 -15 24 34 -13 55 14 0.81 139 0 0 -14 42 59 13 44 44.8 8 279 -73 -15 17 18 -14 8 56 -15 27 54 -13 58 32 0.82 140 0 0 -14 46 49 13 44 45.5 7 279 -74 -15 21 9 -14 12 45 -15 31 44 -14 2 20 0.82 141 0 0 -14 51 9 13 44 46.2 6 279 -75 -15 25 30 -14 17 3 -15 36 6 -14 6 38 0.83 142 0 0 -14 55 59 13 44 46.8 5 279 -75 -15 30 21 -14 21 52 -15 40 58 -14 11 27 0.84 143 0 0 -15 1 19 13 44 47.2 4 278 -76 -15 35 43 -14 27 12 -15 46 20 -14 16 46 0.86 144 0 0 -15 7 10 13 44 47.6 3 278 -77 -15 41 35 -14 33 1 -15 52 13 -14 22 35 0.89 145 0 0 -15 13 31 13 44 47.8 2 278 -78 -15 47 58 -14 39 20 -15 58 36 -14 28 53 0.96 146 0 0 -15 20 22 13 44 47.9 1 278 -78 -15 54 50 -14 46 9 -16 5 29 -14 35 42 1.21 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 14.3 Data for the target star ------------------------ * name: UCAC4 486-027040 * constellation : Monoceros * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 06 39 38.1956 DE: +07 03 52.764 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 06 39 38.1954 DE: +07 03 52.764 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.8 * B mag [mag]: 12.0 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (491) Carina asteroid class: approx. diameter [km]: 100 approx. diameter ["]: 0.045 distance from Earth [AU]: 3.03960 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#79 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): 0.018", 0.003", 87.6° remarks: * orbital elements for (491)Carina : Mean anomaly = 63.8105956902 deg Arg. of pericenter = 230.1887715195 deg Long. of node = 175.3201869414 deg Inclination = 18.8697295793 deg Eccentricity = 0.0835740961 Semimajor axis = 3.1908695738 AU Perihelion dist = 2.9241955335 AU Mag: H = 9.07, G = 0.15 Epoch of elements : MJD 60406.57010450 TDT (2024 Apr 06.5701) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#792023Apr27,4.56,2024,4,6,13.682512,0.231361,-0.565582,11.415980,4.664807,0.005777,-0.000607,0.000000,0.000000 59.6614,7.0422,-24.67,6.77,False UCAC4 486-027040,6.66060990,7.0646567,12.04,11.78,11.64,0.0,0,,6.68229938,7.0421714,3.18,2.88,0,0,1 491,Carina,14.90,99.546,3.0396,0,0,2.219,13.50,,5.2,0 0,63.7120,2024,4,6,230.1888,175.3202,18.8697,0.08357,3.19087,2.92420,9.07,5.0,0.15 1.154,0.0183,0.0033,88,0.0069,Known errors,0.87,0,-1,-1 20240406_027040,60139.28 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 14, 06:38 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org