IOTA/IOTA-ES occultation update for (261) Prymno / UCAC4 344-182166 event on 2024 Mar 30, 05:26 UT Visible from Summary ------- On 2024 Mar 30 UT, the 49.656 km diameter asteroid (261) Prymno will occult a 11.7 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 2.69 mag to 14.28 mag (the magnitude of the asteroid) for at most 2.290 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 Mar 30, 05:22 - 2024 Mar 30, 05:29 * geocentric midpoint of event [JD]: 2460399.72656109 * magnitude of target star: 11.69 * magnitude drop [mag]: 2.69 * estimated maximum duration [s]: 2.290 * Moon: 79 % sunlit, 44° distance * Sun: 81° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 71 * 1 sigma uncertainty interval [path widths]: +/- 0.05 * 1 sigma uncertainty interval [seconds]: +/- 1.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.014, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.014", 0.002", 86°) * approx speed of asteroid's shadow [km/s]: 21.6804 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 344-182166 by 261 Prymno on 2024 Mar 30 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 - 93 0 0 -47 16 23 5 22 51.1 0 122 -45 -47 39 31 -46 53 26 -47 42 1 -46 50 58 .... - 92 0 0 -47 42 7 5 22 51.2 1 121 -45 -48 5 17 -47 19 9 -48 7 48 -47 16 41 0.89 - 91 0 0 -48 7 45 5 22 51.4 2 120 -45 -48 30 57 -47 44 45 -48 33 27 -47 42 18 0.96 - 90 0 0 -48 33 16 5 22 51.6 3 120 -45 -48 56 28 -48 10 15 -48 58 59 -48 7 47 0.98 - 89 0 0 -48 58 38 5 22 52.0 4 119 -44 -49 21 52 -48 35 36 -49 24 22 -48 33 8 1.00 - 88 0 0 -49 23 51 5 22 52.4 4 118 -44 -49 47 6 -49 0 49 -49 49 37 -48 58 20 1.01 - 87 0 0 -49 48 55 5 22 52.8 5 117 -44 -50 12 10 -49 25 52 -50 14 41 -49 23 23 1.02 - 86 0 0 -50 13 49 5 22 53.4 6 116 -43 -50 37 4 -49 50 45 -50 39 35 -49 48 16 1.02 - 85 0 0 -50 38 31 5 22 54.0 7 116 -43 -51 1 47 -50 15 27 -51 4 18 -50 12 58 1.03 - 84 0 0 -51 3 2 5 22 54.7 7 115 -43 -51 26 18 -50 39 57 -51 28 48 -50 37 29 1.03 - 83 0 0 -51 27 20 5 22 55.5 8 114 -43 -51 50 36 -51 4 16 -51 53 7 -51 1 47 1.03 - 82 0 0 -51 51 25 5 22 56.3 9 113 -42 -52 14 41 -51 28 21 -52 17 12 -51 25 53 1.03 - 81 0 0 -52 15 17 5 22 57.1 10 113 -42 -52 38 32 -51 52 14 -52 41 3 -51 49 45 1.03 - 80 0 0 -52 38 55 5 22 58.1 10 112 -41 -53 2 10 -52 15 52 -53 4 40 -52 13 24 1.04 - 79 0 0 -53 2 18 5 22 59.1 11 111 -41 -53 25 32 -52 39 16 -53 28 3 -52 36 48 1.04 - 78 0 0 -53 25 27 5 23 0.1 12 110 -41 -53 48 39 -53 2 25 -53 51 10 -52 59 57 1.04 - 77 0 0 -53 48 19 5 23 1.2 12 109 -40 -54 11 31 -53 25 19 -54 14 1 -53 22 51 1.04 - 76 0 0 -54 10 56 5 23 2.4 13 108 -40 -54 34 6 -53 47 57 -54 36 36 -53 45 29 1.04 - 75 0 0 -54 33 16 5 23 3.6 14 107 -39 -54 56 24 -54 10 18 -54 58 54 -54 7 51 1.04 - 74 0 0 -54 55 19 5 23 4.8 14 107 -39 -55 18 26 -54 32 23 -55 20 56 -54 29 56 1.04 - 73 0 0 -55 17 5 5 23 6.1 15 106 -38 -55 40 10 -54 54 11 -55 42 39 -54 51 44 1.04 - 72 0 0 -55 38 33 5 23 7.5 16 105 -38 -56 1 36 -55 15 41 -56 4 5 -55 13 14 1.04 - 71 0 0 -55 59 43 5 23 8.8 16 104 -38 -56 22 44 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29 273 32 -53 51 25 -53 5 9 -53 53 55 -53 2 41 1.06 90 0 0 -53 4 56 5 28 41.9 29 272 33 -53 28 11 -52 41 53 -53 30 42 -52 39 25 1.06 91 0 0 -52 41 26 5 28 44.4 28 271 33 -53 4 41 -52 18 22 -53 7 12 -52 15 53 1.06 92 0 0 -52 17 40 5 28 47.0 27 270 34 -52 40 56 -51 54 35 -52 43 27 -51 52 7 1.07 93 0 0 -51 53 40 5 28 49.5 27 269 34 -52 16 57 -51 30 35 -52 19 28 -51 28 6 1.07 94 0 0 -51 29 26 5 28 51.9 26 268 34 -51 52 43 -51 6 20 -51 55 14 -51 3 52 1.07 95 0 0 -51 4 58 5 28 54.4 25 267 35 -51 28 16 -50 41 52 -51 30 47 -50 39 24 1.07 96 0 0 -50 40 18 5 28 56.8 25 266 35 -51 3 35 -50 17 12 -51 6 6 -50 14 44 1.07 97 0 0 -50 15 26 5 28 59.1 24 265 36 -50 38 43 -49 52 20 -50 41 14 -49 49 52 1.07 98 0 0 -49 50 22 5 29 1.5 23 264 36 -50 13 39 -49 27 17 -50 16 10 -49 24 48 1.07 99 0 0 -49 25 8 5 29 3.7 23 263 37 -49 48 24 -49 2 3 -49 50 55 -48 59 35 1.07 100 0 0 -48 59 43 5 29 6.0 22 262 37 -49 22 59 -48 36 39 -49 25 30 -48 34 11 1.07 101 0 0 -48 34 10 5 29 8.1 21 262 38 -48 57 24 -48 11 7 -48 59 55 -48 8 39 1.08 102 0 0 -48 8 28 5 29 10.2 21 261 38 -48 31 41 -47 45 26 -48 34 12 -47 42 58 1.08 103 0 0 -47 42 38 5 29 12.3 20 260 38 -48 5 50 -47 19 37 -48 8 21 -47 17 9 1.08 104 0 0 -47 16 41 5 29 14.3 19 259 39 -47 39 52 -46 53 42 -47 42 22 -46 51 14 1.08 105 0 0 -46 50 38 5 29 16.3 18 258 39 -47 13 47 -46 27 41 -47 16 18 -46 25 13 1.08 106 0 0 -46 24 30 5 29 18.1 18 257 39 -46 47 37 -46 1 34 -46 50 7 -45 59 7 1.08 107 0 0 -45 58 18 5 29 20.0 17 257 40 -46 21 23 -45 35 23 -46 23 53 -45 32 56 1.09 108 0 0 -45 32 1 5 29 21.7 16 256 40 -45 55 4 -45 9 9 -45 57 34 -45 6 42 1.09 109 0 0 -45 5 42 5 29 23.4 15 255 40 -45 28 43 -44 42 53 -45 31 12 -44 40 26 1.09 110 0 0 -44 39 21 5 29 25.0 14 254 40 -45 2 20 -44 16 34 -45 4 49 -44 14 7 1.09 111 0 0 -44 12 59 5 29 26.5 14 253 41 -44 35 55 -43 50 14 -44 38 24 -43 47 48 1.10 112 0 0 -43 46 37 5 29 27.9 13 253 41 -44 9 30 -43 23 55 -44 11 59 -43 21 29 1.10 113 0 0 -43 20 16 5 29 29.3 12 252 41 -43 43 6 -42 57 36 -43 45 34 -42 55 11 1.10 114 0 0 -42 53 56 5 29 30.6 11 251 41 -43 16 43 -42 31 19 -43 19 11 -42 28 54 1.11 115 0 0 -42 27 38 5 29 31.8 10 251 41 -42 50 23 -42 5 5 -42 52 50 -42 2 40 1.11 116 0 0 -42 1 24 5 29 32.9 9 250 42 -42 24 5 -41 38 54 -42 26 32 -41 36 29 1.12 117 0 0 -41 35 14 5 29 33.9 9 249 42 -41 57 52 -41 12 47 -42 0 19 -41 10 23 1.13 118 0 0 -41 9 9 5 29 34.8 8 248 42 -41 31 44 -40 46 46 -41 34 10 -40 44 22 1.14 119 0 0 -40 43 11 5 29 35.6 7 248 42 -41 5 41 -40 20 50 -41 8 7 -40 18 27 1.15 120 0 0 -40 17 18 5 29 36.4 6 247 42 -40 39 46 -39 55 2 -40 42 11 -39 52 38 1.16 121 0 0 -39 51 34 5 29 37.0 5 246 42 -40 13 58 -39 29 21 -40 16 23 -39 26 58 1.18 122 0 0 -39 25 58 5 29 37.5 4 246 42 -39 48 18 -39 3 48 -39 50 43 -39 1 26 1.21 123 0 0 -39 0 31 5 29 38.0 3 245 42 -39 22 47 -38 38 25 -39 25 12 -38 36 3 1.26 124 0 0 -38 35 15 5 29 38.3 2 245 42 -38 57 27 -38 13 13 -38 59 51 -38 10 51 1.33 125 0 0 -38 10 9 5 29 38.6 2 244 41 -38 32 17 -37 48 11 -38 34 41 -37 45 49 1.49 126 0 0 -37 45 15 5 29 38.7 1 243 41 -38 7 19 -37 23 21 -38 9 43 -37 21 0 2.09 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 14.3 Data for the target star ------------------------ * name: UCAC4 344-182166 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 18 31.2469 DE: -21 20 55.951 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 18 31.2470 DE: -21 20 55.951 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.7 * B mag [mag]: 12.2 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (261) Prymno asteroid class: approx. diameter [km]: 50 approx. diameter ["]: 0.030 distance from Earth [AU]: 2.28060 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#129 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): 0.014", 0.002", 86° remarks: * orbital elements for (261)Prymno : Mean anomaly = 89.7492343556 deg Arg. of pericenter = 66.7556988675 deg Long. of node = 96.5774216281 deg Inclination = 3.6338250713 deg Eccentricity = 0.0900856050 Semimajor axis = 2.3316225248 AU Perihelion dist = 2.1215768990 AU Mag: H = 9.49, G = 0.19 Epoch of elements : MJD 60399.22656091 TDT (2024 Mar 30.2266) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1292023Apr24,2.29,2024,3,30,5.437466,0.069337,-0.715670,12.180444,1.175461,-0.005443,-0.000731,0.000000,0.000000 20.3290,-21.3060,99.54,3.96,False UCAC4 344-182166,19.30867967,-21.3488753,12.21,11.69,11.41,0.0,0,,19.33254515,-21.3059528,2.69,2.54,0,0,0 261,Prymno,14.28,49.656,2.2806,0,0,3.361,4.54,,2.4,0 0,89.6865,2024,3,30,66.7557,96.5774,3.6338,0.09009,2.33162,2.12158,9.49,5.0,0.15 1.054,0.0137,0.0016,86,0.0016,Known errors,0.80,0,-1,-1 20240330_182166,60139.26 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 14, 06:19 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org