IOTA/IOTA-ES occultation update for (33) Polyhymnia / TYC 6179-00884-1 event on 2023 Apr 22, 17:13 UT Visible from New Zealand Summary ------- On 2023 Apr 22 UT, the 51.6 km diameter asteroid (33) Polyhymnia will occult a 11.3 mag star in the constellation Libra for observers along a path across New Zealand. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.06 mag to 13.16 mag (the magnitude of the asteroid) for at most 4.510 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 Apr 22, 17:04 - 2023 Apr 22, 17:21 * geocentric midpoint of event [JD]: 2460057.21729583 * magnitude of target star: 11.28 * magnitude drop [mag]: 2.06 * estimated maximum duration [s]: 4.510 * Moon: 7 % sunlit, 170° distance * Sun: 159° distance * rough path description: New Zealand The occultation path -------------------- * approximate projected width [km]: 56 * 1 sigma uncertainty interval [path widths]: +/- 0.09 * 1 sigma uncertainty interval [seconds]: +/- 3.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.024, +/- 0.007) * 1 sigma uncertainty ellipse (major, minor, PA): (0.025", 0.002", 106°) * approx speed of asteroid's shadow [km/s]: 11.4477 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6179-00884-1 by 33 Polyhymnia on 2023 Apr 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 26 0 0 -10 50 23 17 21 29.2 0 111 -18 .. .. .. -11 6 31 .. .. .. -11 9 18 .... 27 0 0 -11 12 55 17 21 29.1 1 110 -19 -10 56 48 -11 29 4 -10 54 1 -11 31 52 0.33 28 0 0 -11 35 42 17 21 28.8 2 110 -20 -11 19 33 -11 51 52 -11 16 46 -11 54 40 0.36 29 0 0 -11 58 42 17 21 28.2 3 110 -22 -11 42 32 -12 14 54 -11 39 44 -12 17 42 0.38 30 0 0 -12 21 55 17 21 27.5 4 110 -23 -12 5 44 -12 38 8 -12 2 56 -12 40 57 0.38 31 0 0 -12 45 20 17 21 26.6 5 110 -24 -12 29 8 -13 1 35 -12 26 20 -13 4 24 0.38 32 0 0 -13 8 58 17 21 25.5 6 109 -25 -12 52 44 -13 25 14 -12 49 56 -13 28 3 0.39 33 0 0 -13 32 47 17 21 24.2 7 109 -26 -13 16 32 -13 49 4 -13 13 43 -13 51 53 0.39 34 0 0 -13 56 46 17 21 22.6 8 109 -27 -13 40 30 -14 13 4 -13 37 41 -14 15 54 0.39 35 0 0 -14 20 56 17 21 20.9 9 109 -28 -14 4 38 -14 37 15 -14 1 50 -14 40 5 0.39 36 0 0 -14 45 15 17 21 19.0 11 108 -29 -14 28 56 -15 1 35 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59 57 -34 32 31 -33 57 8 -34 35 21 0.44 -140 0 0 -33 55 25 17 4 24.0 7 250 14 -33 39 7 -34 11 44 -33 36 18 -34 14 34 0.45 -139 0 0 -33 34 19 17 4 23.0 6 249 15 -33 18 0 -33 50 40 -33 15 11 -33 53 30 0.46 -138 0 0 -33 12 57 17 4 22.1 5 249 16 -32 56 36 -33 29 19 -32 53 47 -33 32 9 0.47 -137 0 0 -32 51 18 17 4 21.4 4 248 17 -32 34 56 -33 7 42 -32 32 7 -33 10 32 0.48 -136 0 0 -32 29 23 17 4 20.8 3 248 18 -32 13 0 -32 45 48 -32 10 10 -32 48 38 0.51 -135 0 0 -32 7 12 17 4 20.3 2 247 19 -31 50 48 -32 23 38 -31 47 57 -32 26 29 0.56 -134 0 0 -31 44 45 17 4 20.1 1 247 20 -31 28 20 -32 1 12 -31 25 29 -32 4 3 0.70 -133 0 0 -31 22 3 17 4 19.9 0 246 20 -31 5 36 -31 38 31 -31 2 46 -31 41 23 2.37 Uncertainty in time = +/- 3 secs Prediction of 2023 Mar 1.1 Data for the target star ------------------------ * name: TYC 6179-00884-1 * constellation : Libra * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 15 22 03.9502 DE: -20 13 00.831 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 15 22 03.9502 DE: -20 13 00.831 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.3 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (33) Polyhymnia asteroid class: approx. diameter [km]: 52 approx. diameter ["]: 0.034 distance from Earth [AU]: 2.11720 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#63 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): 0.025", 0.002", 106.075° remarks: * orbital elements for (33)Polyhymnia : Mean anomaly = 276.4018528916 deg Arg. of pericenter = 338.5633136489 deg Long. of node = 8.4421678671 deg Inclination = 1.8523371998 deg Eccentricity = 0.3317215561 Semimajor axis = 2.8738073726 AU Perihelion dist = 1.9205035191 AU Mag: H = 8.55, G = 0.33 Epoch of elements : MJD 60056.71743056 TDT (2023 Apr 22.7174) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#632023Feb07,4.51,2023,4,22,17.215100,-0.072732,-0.374845,-6.343154,1.230619,-0.001983,0.000675,0.000001,0.000000 122.1250,-20.3013,-78.59,12.28,False TYC 6179-00884-1,15.36776393,-20.2168973,0.00,11.28,0.00,0.0,0,,15.39026436,-20.3012805,2.06,0.00,0,0,0 33,Polyhymnia,13.16,51.6,2.1172,0,0,-1.873,5.11,,3.4,0 0,276.2567,2023,4,22,338.5633,8.4422,1.8523,0.33172,2.87381,1.92050,8.58,5.0,0.15 1.087,0.0247,0.0019,106,0.0029,Known errors,-1.00,-1,-1,-1 20230422_0884-1,60004.05 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Mar 01, 01:19 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org