IOTA/IOTA-ES occultation update for (76) Freia / UCAC4-341-099197 event on 2023 Feb 26, 16:44 UT Visible from New Zealand, Australia Summary ------- On 2023 Feb 26 UT, the 166.8 km diameter asteroid (76) Freia will occult a 12.3 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 2.70 mag to 14.87 mag (the magnitude of the asteroid) for at most 7.610 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: 99 * date and approx. time of event: 2023 Feb 26, 16:39 - 2023 Feb 26, 16:49 * geocentric midpoint of event [JD]: 2460002.19776625 * magnitude of target star: 12.26 * magnitude drop [mag]: 2.70 * estimated maximum duration [s]: 7.610 * Moon: 44 % sunlit, 157° distance * Sun: 74° distance * rough path description: New Zealand, Australia The occultation path -------------------- * approximate projected width [km]: 174 * 1 sigma uncertainty interval [path widths]: +/- 0.12 * 1 sigma uncertainty interval [seconds]: +/- 1.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.010, +/- 0.007) * 1 sigma uncertainty ellipse (major, minor, PA): (0.011", 0.006", 110°) * approx speed of asteroid's shadow [km/s]: 21.9219 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4-341-099197 by 76 Freia on 2023 Feb 26 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 121 0 0 -15 50 43 16 40 8.5 0 113 -64 -16 42 14 -14 59 27 -16 54 57 .. .. .. .... 122 0 0 -16 15 6 16 40 8.6 1 112 -64 -17 6 38 -15 23 49 -17 19 21 -15 11 15 0.30 123 0 0 -16 39 29 16 40 8.8 2 112 -63 -17 31 2 -15 48 11 -17 43 45 -15 35 37 0.30 124 0 0 -17 3 52 16 40 9.0 3 112 -62 -17 55 25 -16 12 33 -18 8 8 -15 59 58 0.31 125 0 0 -17 28 13 16 40 9.4 5 111 -61 -18 19 47 -16 36 55 -18 32 31 -16 24 20 0.31 126 0 0 -17 52 33 16 40 9.9 6 111 -61 -18 44 8 -17 1 14 -18 56 51 -16 48 39 0.31 127 0 0 -18 16 51 16 40 10.5 7 111 -60 -19 8 26 -17 25 32 -19 21 10 -17 12 57 0.31 128 0 0 -18 41 6 16 40 11.2 8 111 -59 -19 32 41 -17 49 47 -19 45 25 -17 37 12 0.31 129 0 0 -19 5 18 16 40 12.0 9 110 -58 -19 56 53 -18 13 59 -20 9 36 -18 1 24 0.31 130 0 0 -19 29 26 16 40 12.8 10 110 -57 -20 21 0 -18 38 7 -20 33 43 -18 25 32 0.31 131 0 0 -19 53 29 16 40 13.8 11 110 -57 -20 45 3 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75 -21 4 12 -19 21 21 -21 16 55 -19 8 47 0.34 - 59 0 0 -19 48 40 16 49 20.1 11 250 75 -20 40 13 -18 57 22 -20 52 57 -18 44 47 0.34 - 58 0 0 -19 24 36 16 49 21.0 10 250 75 -20 16 10 -18 33 17 -20 28 53 -18 20 42 0.34 - 57 0 0 -19 0 27 16 49 21.9 9 250 74 -19 52 2 -18 9 8 -20 4 45 -17 56 33 0.35 - 56 0 0 -18 36 15 16 49 22.7 7 249 74 -19 27 49 -17 44 55 -19 40 33 -17 32 20 0.35 - 55 0 0 -18 11 59 16 49 23.3 6 249 73 -19 3 33 -17 20 40 -19 16 17 -17 8 5 0.36 - 54 0 0 -17 47 40 16 49 23.9 5 249 73 -18 39 15 -16 56 22 -18 51 58 -16 43 46 0.37 - 53 0 0 -17 23 20 16 49 24.4 4 248 72 -18 14 54 -16 32 1 -18 27 37 -16 19 26 0.38 - 52 0 0 -16 58 58 16 49 24.8 3 248 71 -17 50 31 -16 7 40 -18 3 15 -15 55 5 0.40 - 51 0 0 -16 34 35 16 49 25.0 2 248 71 -17 26 8 -15 43 18 -17 38 51 -15 30 43 0.44 - 50 0 0 -16 10 12 16 49 25.2 1 248 70 -17 1 44 -15 18 56 -17 14 27 -15 6 21 0.56 - 49 0 0 -15 45 49 16 49 25.3 0 247 69 -16 37 20 .. .. .. -16 50 3 .. .. .. 1.77 Uncertainty in time = +/- 1 secs Prediction of 2023 Feb 15.9 Data for the target star ------------------------ * name: UCAC4-341-099197 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 32 16.5385 DE: -21 50 12.925 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 32 16.5385 DE: -21 50 12.925 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 12.3 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (76) Freia asteroid class: approx. diameter [km]: 167 approx. diameter ["]: 0.057 distance from Earth [AU]: 4.05360 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#72 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): 0.011", 0.006", 109.89° remarks: * orbital elements for (76)Freia : Mean anomaly = 143.4754859781 deg Arg. of pericenter = 252.0088959792 deg Long. of node = 204.2827816493 deg Inclination = 2.1227384351 deg Eccentricity = 0.1667251290 Semimajor axis = 3.4125851372 AU Perihelion dist = 2.8436214399 AU Mag: H = 8.06, G = 0.15 Epoch of elements : MJD 60001.69770833 TDT (2023 Feb 26.6977) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#722023Feb07,7.61,2023,2,26,16.746390,0.000541,-0.289617,12.373321,0.003572,-0.005814,0.000306,0.000000,0.000000 -144.0566,-21.8542,-67.98,-8.64,False UCAC4-341-099197,17.53792733,-21.8369236,0.00,12.26,0.00,0.0,4,,17.56081458,-21.8541538,2.70,0.00,0,0,0 76,Freia,14.87,166.8,4.0536,0,0,1.929,0.01,,8.4,0 0,143.3664,2023,2,26,252.0089,204.2828,2.1227,0.16673,3.41259,2.84362,8.07,5.0,0.15 1.123,0.0107,0.0063,110,0.0070,Known errors,-1.00,-1,-1,-1 20230226_099197,59990.86 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Feb 15, 20:41 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org