IOTA/IOTA-ES occultation update for (503) Evelyn / UCAC4-344-084997 event on 2021 Mar 05, 16:54 UT Visible from New Zealand, Australia Summary ------- On 2021 Mar 05 UT, the 87.8 km diameter asteroid (503) Evelyn will occult a 12.4 mag star in the constellation Ophiuchus for observers along a path across New Zealand, Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.62 mag to 14.88 mag (the magnitude of the asteroid) for at most 5.8 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: 93 * date and approx. time of event: 2021 Mar 05, 16:47 - 2021 Mar 05, 17:01 * geocentric midpoint of event [JD]: 2459279.20455000 * magnitude of target star: 12.36 * magnitude drop [mag]: 2.62 * estimated maximum duration [s]: 5.8 * Moon: 54 % sunlit, 5° distance * Sun: 90° distance * rough path description: New Zealand, Australia The occultation path -------------------- * approximate projected width [km]: 94 * 1 sigma uncertainty interval [path widths]: +/- 0.47 * 1 sigma uncertainty interval [seconds]: +/- 2.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.014, +/- 0.021) * 1 sigma uncertainty ellipse (major, minor, PA): (0.021", 0.014", 168°) * approx speed of asteroid's shadow [km/s]: 15.0890 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4-344-084997 by 503 Evelyn on 2021 Mar 5 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 105 0 0 -11 11 41 16 48 1.0 1 112 -72 -11 39 24 -10 44 4 -12 5 23 -10 18 20 .... 106 0 0 -11 35 42 16 48 1.2 2 111 -72 -12 3 28 -11 8 3 -12 29 30 -10 42 16 0.36 107 0 0 -11 59 58 16 48 1.5 3 111 -72 -12 27 46 -11 32 16 -12 53 51 -11 6 26 0.38 108 0 0 -12 24 27 16 48 2.0 4 111 -72 -12 52 17 -11 56 42 -13 18 24 -11 30 50 0.38 109 0 0 -12 49 8 16 48 2.6 5 111 -71 -13 17 1 -12 21 21 -13 43 11 -11 55 27 0.39 110 0 0 -13 14 2 16 48 3.4 6 111 -71 -13 41 58 -12 46 13 -14 8 10 -12 20 16 0.39 111 0 0 -13 39 8 16 48 4.4 7 110 -71 -14 7 6 -13 11 16 -14 33 21 -12 45 18 0.39 112 0 0 -14 4 25 16 48 5.5 8 110 -70 -14 32 25 -13 36 31 -14 58 42 -13 10 30 0.39 113 0 0 -14 29 52 16 48 6.8 9 110 -70 -14 57 55 -14 1 56 -15 24 14 -13 35 53 0.39 114 0 0 -14 55 30 16 48 8.2 10 110 -69 -15 23 34 -14 27 31 -15 49 55 -14 1 26 0.39 115 0 0 -15 21 16 16 48 9.7 11 109 -69 -15 49 23 -14 53 15 -16 15 46 -14 27 8 0.39 116 0 0 -15 47 11 16 48 11.5 12 109 -68 -16 15 20 -15 19 8 -16 41 44 -14 52 59 0.40 117 0 0 -16 13 13 16 48 13.3 13 109 -67 -16 41 24 -15 45 8 -17 7 51 -15 18 58 0.40 118 0 0 -16 39 23 16 48 15.4 14 108 -67 -17 7 36 -16 11 16 -17 34 4 -15 45 4 0.40 119 0 0 -17 5 39 16 48 17.5 15 108 -66 -17 33 53 -16 37 30 -18 0 23 -16 11 17 0.40 120 0 0 -17 32 1 16 48 19.9 17 108 -65 -18 0 17 -17 3 51 -18 26 48 -16 37 36 0.40 121 0 0 -17 58 28 16 48 22.3 18 107 -64 -18 26 45 -17 30 16 -18 53 18 -17 3 59 0.40 122 0 0 -18 24 59 16 48 24.9 19 107 -63 -18 53 18 -17 56 46 -19 19 52 -17 30 28 0.40 123 0 0 -18 51 33 16 48 27.7 20 107 -63 -19 19 53 -18 23 19 -19 46 29 -17 57 0 0.40 124 0 0 -19 18 10 16 48 30.6 21 106 -62 -19 46 32 -18 49 55 -20 13 9 -18 23 35 0.40 125 0 0 -19 44 50 16 48 33.6 22 106 -61 -20 13 12 -19 16 33 -20 39 50 -18 50 12 0.40 126 0 0 -20 11 30 16 48 36.7 23 106 -60 -20 39 54 -19 43 13 -21 6 32 -19 16 51 0.40 127 0 0 -20 38 12 16 48 40.0 24 105 -59 -21 6 36 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44 7 17 1 8.9 1 246 65 -29 12 19 -28 16 1 -29 38 46 -27 49 50 1.01 Uncertainty in time = +/- 3 secs Prediction of 2021 Feb 28.0 Data for the target star ------------------------ * name: UCAC4-344-084997 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 16 56 04.5905 DE: -21 22 11.823 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 16 56 04.5905 DE: -21 22 11.823 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (503) Evelyn asteroid class: approx. diameter [km]: 88 approx. diameter ["]: 0.044 distance from Earth [AU]: 2.76060 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#57 date of fit: 2021 Feb 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): 0.021", 0.014", -12.022° remarks: * orbital elements for (503)Evelyn : Mean anomaly = 106.86129122 deg Arg. of pericenter = 41.70033100 deg Long. of node = 68.89248827 deg Inclination = 5.01033822 deg Eccentricity = 0.17608170 Semimajor axis = 2.72205951 AU Perihelion dist = 2.24275466 AU Mag: H = 9.35, G = 0.15 Epoch of elements : MJD 59278.70458333 TDT (2021 Mar 05.7046) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#572021Feb24,5.8,2021,3,5,16.9092,-0.06402,-0.35527,8.40043,-1.40227,-0.00585,0.00063,0.00000,0.00000 -162.9629,-21.4025,-70.79,-5.78,False UCAC4-344-084997,16.93460846,-21.3699509,0.00,12.36,0.00,0.0,4,,16.95532800,-21.4024840 503,Evelyn,14.88,87.8,2.7606,0,0,1.917,-4.47,,5.0 0,106.7067,2021,3,5,41.7003,68.8925,5.0103,0.17608,2.72206,2.24275,9.35,5.0,0.15 1.468,0.0213,0.0140,168,0.0205,Known errors,-1.00,-1,-1,-1 20210305_084997,59273.00 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2021 Feb 28, 21:40 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org