IOTA/IOTA-ES occultation update for (261) Prymno / UCAC4 566-043456 event on 2023 Feb 22, 14:51 UT Visible from N Australia Summary ------- On 2023 Feb 22 UT, the 49.6 km diameter asteroid (261) Prymno will occult a 11.8 mag star in the constellation Cancer for observers along a path across N Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.06 mag to 12.37 mag (the magnitude of the asteroid) for at most 7.990 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: 2023 Feb 22, 14:36 - 2023 Feb 22, 15:07 * geocentric midpoint of event [JD]: 2459998.11926766 * magnitude of target star: 11.83 * magnitude drop [mag]: 1.06 * estimated maximum duration [s]: 7.990 * Moon: 8 % sunlit, 120° distance * Sun: 151° distance * rough path description: N Australia The occultation path -------------------- * approximate projected width [km]: 56 * 1 sigma uncertainty interval [path widths]: +/- 0.05 * 1 sigma uncertainty interval [seconds]: +/- 2.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.016, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.016", 0.002", 101°) * approx speed of asteroid's shadow [km/s]: 6.2102 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 566-043456 by 261 Prymno on 2023 Feb 22 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 24 0 0 .. .. .... .. .. .. .. .. .. - 9 45 46 .. .. .. - 9 44 13 .. .. .. .... 25 0 0 - 9 37 10 15 6 47.3 1 66 23 - 9 20 19 - 9 54 4 - 9 18 46 - 9 55 38 .... 26 0 0 - 9 12 11 15 6 46.7 2 66 22 - 8 55 24 - 9 29 1 - 8 53 51 - 9 30 34 0.36 27 0 0 - 8 47 43 15 6 45.7 3 66 21 - 8 30 59 - 9 4 29 - 8 29 27 - 9 6 2 0.43 28 0 0 - 8 23 47 15 6 44.3 4 66 20 - 8 7 7 - 8 40 30 - 8 5 34 - 8 42 2 0.47 29 0 0 - 8 0 22 15 6 42.5 5 66 19 - 7 43 46 - 8 17 2 - 7 42 14 - 8 18 34 0.49 30 0 0 - 7 37 30 15 6 40.3 6 66 18 - 7 20 57 - 7 54 6 - 7 19 25 - 7 55 38 0.50 31 0 0 - 7 15 10 15 6 37.8 7 66 17 - 6 58 40 - 7 31 43 - 6 57 9 - 7 33 15 0.51 32 0 0 - 6 53 23 15 6 34.8 8 65 16 - 6 36 56 - 7 9 52 - 6 35 25 - 7 11 24 0.52 33 0 0 - 6 32 8 15 6 31.5 9 65 15 - 6 15 44 - 6 48 34 - 6 14 13 - 6 50 5 0.53 34 0 0 - 6 11 25 15 6 27.9 11 65 14 - 5 55 5 - 6 27 48 - 5 53 34 - 6 29 19 0.53 35 0 0 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14 -34 26 38 -35 6 57 0.59 172 0 0 -35 18 24 14 37 9.2 12 310 -38 -34 59 59 -35 36 53 -34 58 17 -35 38 35 0.59 173 0 0 -35 49 50 14 37 5.3 11 309 -37 -35 31 25 -36 8 19 -35 29 43 -36 10 1 0.59 174 0 0 -36 21 2 14 37 1.8 10 308 -36 -36 2 38 -36 39 31 -36 0 56 -36 41 13 0.59 175 0 0 -36 52 0 14 36 58.6 9 308 -35 -36 33 37 -37 10 28 -36 31 55 -37 12 10 0.59 176 0 0 -37 22 43 14 36 55.7 8 307 -34 -37 4 20 -37 41 10 -37 2 38 -37 42 52 0.59 177 0 0 -37 53 9 14 36 53.1 7 307 -33 -37 34 47 -38 11 35 -37 33 5 -38 13 18 0.59 178 0 0 -38 23 18 14 36 50.9 6 306 -32 -38 4 57 -38 41 43 -38 3 16 -38 43 26 0.59 179 0 0 -38 53 10 14 36 49.0 5 305 -31 -38 34 50 -39 11 34 -38 33 9 -39 13 16 0.59 180 0 0 -39 22 43 14 36 47.4 5 305 -30 -39 4 24 -39 41 5 -39 2 43 -39 42 47 0.59 -179 0 0 -39 51 57 14 36 46.1 4 304 -30 -39 33 40 -40 10 18 -39 31 59 -40 12 0 0.60 -178 0 0 -40 20 51 14 36 45.1 3 304 -29 -40 2 35 -40 39 10 -40 0 54 -40 40 52 0.60 -177 0 0 -40 49 24 14 36 44.4 2 303 -28 -40 31 11 -41 7 42 -40 29 30 -41 9 23 0.61 -176 0 0 -41 17 37 14 36 44.0 1 302 -27 -40 59 25 -41 35 52 -40 57 44 -41 37 34 0.65 -175 0 0 -41 45 27 14 36 43.9 0 302 -26 -41 27 18 .. .. .. -41 25 37 .. .. .. 1.48 Uncertainty in time = +/- 2 secs Prediction of 2023 Feb 15.9 Data for the target star ------------------------ * name: UCAC4 566-043456 * constellation : Cancer * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 08 33 22.2916 DE: +23 06 46.037 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 08 33 22.2915 DE: +23 06 46.037 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (261) Prymno asteroid class: approx. diameter [km]: 50 approx. diameter ["]: 0.056 distance from Earth [AU]: 1.21860 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#128 date of fit: 2023 Feb 07 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): 0.016", 0.002", 100.87° remarks: * orbital elements for (261)Prymno : Mean anomaly = 338.5127943127 deg Arg. of pericenter = 66.8230586810 deg Long. of node = 96.5840343914 deg Inclination = 3.6337181360 deg Eccentricity = 0.0898804776 Semimajor axis = 2.3313803737 AU Perihelion dist = 2.1218347923 AU Mag: H = 9.51, G = 0.19 Epoch of elements : MJD 59997.61930556 TDT (2023 Feb 22.6193) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1282023Feb07,7.99,2023,2,22,14.862424,-0.144584,-0.454517,-3.340309,1.062398,0.002505,-0.001014,0.000001,0.000000 113.4962,23.0338,-39.57,-10.15,False UCAC4 566-043456,8.55619211,23.1127880,0.00,11.83,0.00,0.0,0,K,8.57904677,23.0337899,1.05,0.00,0,0,0 261,Prymno,12.37,49.6,1.2186,0,0,-1.745,7.66,,2.4,0 0,338.3413,2023,2,22,66.8231,96.5840,3.6337,0.08988,2.33138,2.12183,9.53,5.0,0.15 1.046,0.0160,0.0018,101,0.0026,Known errors,-1.00,-1,-1,-1 20230222_043456,59990.86 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Feb 15, 20:39 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org