IOTA/IOTA-ES occultation update for (33) Polyhymnia / UCAC4 357-069923 event on 2023 May 21, 06:42 UT Visible from South America Summary ------- On 2023 May 21 UT, the 51.6 km diameter asteroid (33) Polyhymnia will occult a 12.1 mag star in the constellation Libra for observers along a path across South America. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.16 mag to 12.83 mag (the magnitude of the asteroid) for at most 3.870 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 May 21, 06:34 - 2023 May 21, 06:49 * geocentric midpoint of event [JD]: 2460085.77920850 * magnitude of target star: 12.13 * magnitude drop [mag]: 1.16 * estimated maximum duration [s]: 3.870 * Moon: 3 % sunlit, 147° distance * Sun: 167° distance * rough path description: South America The occultation path -------------------- * approximate projected width [km]: 55 * 1 sigma uncertainty interval [path widths]: +/- 0.06 * 1 sigma uncertainty interval [seconds]: +/- 2.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.024, +/- 0.008) * 1 sigma uncertainty ellipse (major, minor, PA): (0.025", 0.002", 108°) * approx speed of asteroid's shadow [km/s]: 13.3227 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 357-069923 by 33 Polyhymnia on 2023 May 21 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 166 0 0 32 11 36 6 49 36.2 0 113 11 32 27 40 31 55 35 32 29 45 31 53 30 .... 167 0 0 31 50 18 6 49 36.2 1 113 10 32 6 23 31 34 15 32 8 28 31 32 11 -0.06 168 0 0 31 28 43 6 49 36.0 2 114 9 31 44 49 31 12 38 31 46 54 31 10 33 -0.20 169 0 0 31 6 50 6 49 35.6 3 114 8 31 22 58 30 50 44 31 25 3 30 48 39 -0.25 170 0 0 30 44 40 6 49 35.2 4 115 7 31 0 50 30 28 33 31 2 55 30 26 28 -0.27 171 0 0 30 22 14 6 49 34.5 5 115 6 30 38 25 30 6 5 30 40 30 30 4 0 -0.29 172 0 0 29 59 32 6 49 33.8 6 116 6 30 15 44 29 43 22 30 17 50 29 41 16 -0.30 173 0 0 29 36 34 6 49 32.9 7 116 5 29 52 47 29 20 22 29 54 53 29 18 17 -0.31 174 0 0 29 13 20 6 49 31.9 8 117 4 29 29 35 28 57 8 29 31 41 28 55 2 -0.31 175 0 0 28 49 52 6 49 30.7 9 117 3 29 6 7 28 33 38 29 8 14 28 31 32 -0.32 176 0 0 28 26 9 6 49 29.4 10 118 2 28 42 26 28 9 54 28 44 32 28 7 48 -0.32 177 0 0 28 2 12 6 49 27.9 10 118 1 28 18 30 27 45 56 28 20 36 27 43 50 -0.32 178 0 0 27 38 2 6 49 26.3 11 119 0 27 54 20 27 21 45 27 56 27 27 19 39 -0.33 179 0 0 27 13 38 6 49 24.5 12 119 -1 27 29 58 26 57 20 27 32 4 26 55 14 -0.33 -180 0 0 26 49 2 6 49 22.6 13 119 -2 27 5 22 26 32 43 27 7 29 26 30 37 -0.33 -179 0 0 26 24 14 6 49 20.6 14 120 -3 26 40 35 26 7 54 26 42 42 26 5 48 -0.33 -178 0 0 25 59 14 6 49 18.3 15 120 -4 26 15 36 25 42 54 26 17 43 25 40 47 -0.33 -177 0 0 25 34 3 6 49 16.0 16 121 -5 25 50 25 25 17 42 25 52 33 25 15 36 -0.33 -176 0 0 25 8 42 6 49 13.5 17 121 -6 25 25 5 24 52 20 25 27 12 24 50 14 -0.34 -175 0 0 24 43 11 6 49 10.8 18 122 -7 24 59 34 24 26 49 25 1 42 24 24 42 -0.34 -174 0 0 24 17 30 6 49 8.0 19 122 -8 24 33 54 24 1 8 24 36 2 23 59 1 -0.34 -173 0 0 23 51 41 6 49 5.0 20 123 -9 24 8 6 23 35 18 24 10 13 23 33 11 -0.34 -172 0 0 23 25 44 6 49 1.9 21 123 -10 23 42 9 23 9 21 23 44 16 23 7 14 -0.34 -171 0 0 22 59 39 6 48 58.6 22 124 -11 23 16 4 22 43 16 23 18 12 22 41 9 -0.34 -170 0 0 22 33 27 6 48 55.2 23 124 -12 22 49 53 22 17 4 22 52 0 22 14 57 -0.34 -169 0 0 22 7 10 6 48 51.6 24 124 -13 22 23 35 21 50 46 22 25 43 21 48 39 -0.34 -168 0 0 21 40 46 6 48 47.8 25 125 -14 21 57 12 21 24 23 21 59 19 21 22 16 -0.34 -167 0 0 21 14 18 6 48 43.9 26 125 -15 21 30 43 20 57 54 21 32 51 20 55 47 -0.34 -166 0 0 20 47 46 6 48 39.9 27 126 -16 21 4 11 20 31 22 21 6 18 20 29 15 -0.34 -165 0 0 20 21 9 6 48 35.7 28 126 -17 20 37 35 20 4 46 20 39 42 20 2 39 -0.34 -164 0 0 19 54 30 6 48 31.4 29 127 -18 20 10 55 19 38 7 20 13 3 19 36 0 -0.34 -163 0 0 19 27 49 6 48 26.9 30 127 -19 19 44 13 19 11 26 19 46 21 19 9 19 -0.34 -162 0 0 19 1 6 6 48 22.3 31 127 -20 19 17 30 18 44 43 19 19 37 18 42 36 -0.34 -161 0 0 18 34 22 6 48 17.5 32 128 -21 18 50 46 18 18 0 18 52 53 18 15 53 -0.34 -160 0 0 18 7 37 6 48 12.6 33 128 -22 18 24 1 17 51 16 18 26 8 17 49 9 -0.34 -159 0 0 17 40 54 6 48 7.5 34 129 -23 17 57 16 17 24 33 17 59 24 17 22 26 -0.34 -158 0 0 17 14 11 6 48 2.3 35 129 -24 17 30 33 16 57 50 17 32 40 16 55 44 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-57 - 5 2 26 - 5 32 2 - 5 0 31 - 5 33 56 -0.34 - 69 0 0 - 5 15 36 6 37 0.2 45 248 -56 - 5 0 48 - 5 30 24 - 4 58 53 - 5 32 18 -0.34 - 68 0 0 - 5 13 32 6 36 54.3 44 249 -55 - 4 58 43 - 5 28 19 - 4 56 48 - 5 30 14 -0.34 - 67 0 0 - 5 11 2 6 36 48.4 43 249 -55 - 4 56 13 - 5 25 50 - 4 54 18 - 5 27 44 -0.34 - 66 0 0 - 5 8 6 6 36 42.6 42 249 -54 - 4 53 16 - 5 22 54 - 4 51 21 - 5 24 49 -0.35 - 65 0 0 - 5 4 44 6 36 36.9 41 249 -53 - 4 49 54 - 5 19 32 - 4 47 59 - 5 21 27 -0.35 - 64 0 0 - 5 0 56 6 36 31.3 40 249 -52 - 4 46 5 - 5 15 45 - 4 44 10 - 5 17 40 -0.35 - 63 0 0 - 4 56 42 6 36 25.8 39 250 -51 - 4 41 51 - 5 11 31 - 4 39 56 - 5 13 26 -0.35 - 62 0 0 - 4 52 2 6 36 20.4 38 250 -50 - 4 37 11 - 5 6 52 - 4 35 15 - 5 8 47 -0.35 - 61 0 0 - 4 46 56 6 36 15.2 37 250 -49 - 4 32 4 - 5 1 47 - 4 30 9 - 5 3 42 -0.35 - 60 0 0 - 4 41 24 6 36 10.0 36 250 -48 - 4 26 32 - 4 56 16 - 4 24 36 - 4 58 11 -0.35 - 59 0 0 - 4 35 27 6 36 4.9 35 250 -47 - 4 20 33 - 4 50 19 - 4 18 38 - 4 52 14 -0.35 - 58 0 0 - 4 29 3 6 36 0.0 34 250 -46 - 4 14 9 - 4 43 56 - 4 12 13 - 4 45 51 -0.35 - 57 0 0 - 4 22 13 6 35 55.1 33 250 -45 - 4 7 18 - 4 37 7 - 4 5 23 - 4 39 2 -0.35 - 56 0 0 - 4 14 58 6 35 50.4 32 250 -45 - 4 0 2 - 4 29 52 - 3 58 6 - 4 31 48 -0.35 - 55 0 0 - 4 7 16 6 35 45.8 31 250 -44 - 3 52 19 - 4 22 11 - 3 50 23 - 4 24 7 -0.35 - 54 0 0 - 3 59 9 6 35 41.3 31 250 -43 - 3 44 11 - 4 14 5 - 3 42 15 - 4 16 1 -0.35 - 53 0 0 - 3 50 35 6 35 36.9 30 250 -42 - 3 35 37 - 4 5 32 - 3 33 40 - 4 7 28 -0.35 - 52 0 0 - 3 41 36 6 35 32.7 29 250 -41 - 3 26 36 - 3 56 34 - 3 24 40 - 3 58 30 -0.35 - 51 0 0 - 3 32 11 6 35 28.5 28 250 -40 - 3 17 10 - 3 47 10 - 3 15 13 - 3 49 6 -0.35 - 50 0 0 - 3 22 20 6 35 24.5 27 251 -39 - 3 7 18 - 3 37 20 - 3 5 21 - 3 39 16 -0.35 - 49 0 0 - 3 12 3 6 35 20.7 26 251 -38 - 2 57 0 - 3 27 4 - 2 55 3 - 3 29 1 -0.35 - 48 0 0 - 3 1 20 6 35 16.9 25 251 -37 - 2 46 16 - 3 16 23 - 2 44 19 - 3 18 19 -0.35 - 47 0 0 - 2 50 12 6 35 13.3 24 251 -36 - 2 35 6 - 3 5 16 - 2 33 9 - 3 7 12 -0.35 - 46 0 0 - 2 38 38 6 35 9.8 23 251 -35 - 2 23 31 - 2 53 43 - 2 21 34 - 2 55 40 -0.35 - 45 0 0 - 2 26 38 6 35 6.5 22 251 -34 - 2 11 30 - 2 41 45 - 2 9 33 - 2 43 42 -0.35 - 44 0 0 - 2 14 13 6 35 3.2 21 251 -33 - 1 59 4 - 2 29 21 - 1 57 6 - 2 31 18 -0.35 - 43 0 0 - 2 1 22 6 35 0.2 20 251 -32 - 1 46 12 - 2 16 32 - 1 44 14 - 2 18 29 -0.35 - 42 0 0 - 1 48 6 6 34 57.2 19 251 -31 - 1 32 54 - 2 3 17 - 1 30 56 - 2 5 15 -0.35 - 41 0 0 - 1 34 25 6 34 54.4 18 251 -30 - 1 19 11 - 1 49 37 - 1 17 13 - 1 51 35 -0.35 - 40 0 0 - 1 20 19 6 34 51.8 17 251 -29 - 1 5 3 - 1 35 32 - 1 3 5 - 1 37 30 -0.35 - 39 0 0 - 1 5 47 6 34 49.3 16 251 -28 - 0 50 30 - 1 21 2 - 0 48 32 - 1 23 0 -0.35 - 38 0 0 - 0 50 50 6 34 46.9 15 251 -27 - 0 35 32 - 1 6 7 - 0 33 33 - 1 8 6 -0.36 - 37 0 0 - 0 35 29 6 34 44.7 14 251 -26 - 0 20 9 - 0 50 47 - 0 18 10 - 0 52 46 -0.36 - 36 0 0 - 0 19 43 6 34 42.7 13 251 -25 - 0 4 22 - 0 35 3 - 0 2 22 - 0 37 2 -0.36 - 35 0 0 - 0 3 32 6 34 40.8 12 251 -24 0 11 51 - 0 18 54 0 13 50 - 0 20 53 -0.36 - 34 0 0 0 13 3 6 34 39.0 11 251 -23 0 28 27 - 0 2 21 0 30 27 - 0 4 20 -0.36 - 33 0 0 0 30 2 6 34 37.5 10 251 -22 0 45 28 0 14 37 0 47 28 0 12 38 -0.36 - 32 0 0 0 47 25 6 34 36.0 8 251 -21 1 2 53 0 31 59 1 4 53 0 29 59 -0.36 - 31 0 0 1 5 12 6 34 34.8 7 251 -20 1 20 42 0 49 44 1 22 42 0 47 44 -0.36 - 30 0 0 1 23 23 6 34 33.7 6 251 -19 1 38 55 1 7 53 1 40 55 1 5 53 -0.36 - 29 0 0 1 41 57 6 34 32.7 5 251 -18 1 57 31 1 26 25 1 59 31 1 24 25 -0.37 - 28 0 0 2 0 55 6 34 31.9 4 251 -17 2 16 30 1 45 21 2 18 31 1 43 20 -0.37 - 27 0 0 2 20 15 6 34 31.3 3 251 -16 2 35 52 2 4 40 2 37 53 2 2 39 -0.37 - 26 0 0 2 39 58 6 34 30.9 2 251 -15 2 55 37 2 24 21 2 57 38 2 22 20 -0.38 - 25 0 0 3 0 3 6 34 30.6 1 251 -13 3 15 44 2 44 24 3 17 46 2 42 23 -0.41 - 24 0 0 3 20 31 6 34 30.5 0 251 -12 3 36 13 3 4 50 3 38 15 3 2 48 -0.95 Uncertainty in time = +/- 3 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: UCAC4 357-069923 * constellation : Libra * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 14 56 47.8847 DE: -18 47 49.608 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 14 56 47.8847 DE: -18 47 49.608 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.1 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (33) Polyhymnia asteroid class: approx. diameter [km]: 52 approx. diameter ["]: 0.036 distance from Earth [AU]: 1.98910 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#64 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): 0.025", 0.002", 108.286° remarks: * orbital elements for (33)Polyhymnia : Mean anomaly = 282.1760617141 deg Arg. of pericenter = 338.5670951436 deg Long. of node = 8.4414969811 deg Inclination = 1.8523117924 deg Eccentricity = 0.3317169607 Semimajor axis = 2.8737508584 AU Perihelion dist = 1.9204789579 AU Mag: H = 8.54, G = 0.33 Epoch of elements : MJD 60085.27930555 TDT (2023 May 21.2793) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#642023Apr24,3.87,2023,5,21,6.701004,0.085104,0.311403,-7.253628,1.982588,0.001235,-0.000176,0.000001,0.000000 -114.6372,-18.8924,78.64,20.15,False UCAC4 357-069923,14.94663464,-18.7971134,0.00,12.13,0.00,0.0,0,,14.96882573,-18.8923952,1.16,0.00,0,0,0 33,Polyhymnia,12.83,51.6,1.9891,0,0,-2.259,8.76,,3.4,0 0,282.1196,2023,5,21,338.5671,8.4415,1.8523,0.33172,2.87375,1.92048,8.58,5.0,0.15 1.065,0.0250,0.0019,108,0.0023,Known errors,-1.00,-1,-1,-1 20230521_069923,60063.19 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:29 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org