IOTA/IOTA-ES occultation update for (172) Baucis / TYC 7330-02592-1 event on 2021 Feb 20, 19:09 UT Visible from Australia Summary ------- On 2021 Feb 20 UT, the 66.2 km diameter asteroid (172) Baucis will occult a 10.8 mag star in the constellation Lupus for observers along a path across Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.87 mag to 13.56 mag (the magnitude of the asteroid) for at most 3.2 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Hugh Harris, astrometry for the asteroid kindly provided by Bill Owen, 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: 2021 Feb 20, 19:04 - 2021 Feb 20, 19:14 * geocentric midpoint of event [JD]: 2459266.29803750 * magnitude of target star: 10.77 * magnitude drop [mag]: 2.87 * estimated maximum duration [s]: 3.2 * Moon: 60 % sunlit, 167° distance * Sun: 87° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 69 * 1 sigma uncertainty interval [path widths]: +/- 0.21 * 1 sigma uncertainty interval [seconds]: +/- 1.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.014, +/- 0.008) * 1 sigma uncertainty ellipse (major, minor, PA): (0.014", 0.008", 100°) * approx speed of asteroid's shadow [km/s]: 20.4409 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7330-02592-1 by 172 Baucis on 2021 Feb 20 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 80 0 0 8 47 56 19 4 9.1 0 121 -87 8 26 1 9 9 48 8 16 36 9 19 10 .... 81 0 0 8 10 53 19 4 9.2 1 122 -86 7 48 51 8 32 52 7 39 23 8 42 17 0.28 82 0 0 7 33 5 19 4 9.5 3 122 -84 7 10 56 7 55 11 7 1 25 8 4 39 0.28 83 0 0 6 54 33 19 4 9.9 4 122 -83 6 32 17 7 16 46 6 22 43 7 26 17 0.28 84 0 0 6 15 17 19 4 10.4 5 122 -82 5 52 54 6 37 37 5 43 17 6 47 11 0.28 85 0 0 5 35 17 19 4 11.0 6 122 -81 5 12 47 5 57 44 5 3 7 6 7 21 0.28 86 0 0 4 54 35 19 4 11.8 7 122 -80 4 31 58 5 17 9 4 22 15 5 26 49 0.28 87 0 0 4 13 10 19 4 12.8 9 122 -78 3 50 26 4 35 51 3 40 40 4 45 34 0.28 88 0 0 3 31 4 19 4 13.9 10 122 -77 3 8 13 3 53 52 2 58 24 4 3 38 0.28 89 0 0 2 48 17 19 4 15.1 11 122 -76 2 25 19 3 11 12 2 15 27 3 21 1 0.28 90 0 0 2 4 51 19 4 16.6 12 122 -75 1 41 46 2 27 53 1 31 50 2 37 44 0.28 91 0 0 1 20 45 19 4 18.1 14 122 -74 0 57 33 1 43 54 0 47 35 1 53 49 0.28 92 0 0 0 36 2 19 4 19.9 15 122 -72 0 12 43 0 59 17 0 2 42 1 9 15 0.28 93 0 0 - 0 9 18 19 4 21.7 16 122 -71 - 0 32 44 0 14 4 - 0 42 48 0 24 4 0.28 94 0 0 - 0 55 13 19 4 23.8 17 122 -70 - 1 18 46 - 0 31 45 - 1 28 52 - 0 21 42 0.28 95 0 0 - 1 41 43 19 4 26.0 19 122 -69 - 2 5 22 - 1 18 8 - 2 15 31 - 1 8 2 0.28 96 0 0 - 2 28 45 19 4 28.4 20 122 -67 - 2 52 30 - 2 5 3 - 3 2 42 - 1 54 55 0.28 97 0 0 - 3 16 18 19 4 30.9 21 122 -66 - 3 40 9 - 2 52 30 - 3 50 24 - 2 42 19 0.28 98 0 0 - 4 4 21 19 4 33.6 22 122 -65 - 4 28 18 - 3 40 27 - 4 38 36 - 3 30 13 0.28 99 0 0 - 4 52 51 19 4 36.4 24 122 -63 - 5 16 54 - 4 28 52 - 5 27 14 - 4 18 35 0.28 100 0 0 - 5 41 48 19 4 39.4 25 122 -62 - 6 5 56 - 5 17 42 - 6 16 19 - 5 7 24 0.28 101 0 0 - 6 31 8 19 4 42.6 26 121 -61 - 6 55 22 - 6 6 57 - 7 5 47 - 5 56 36 0.28 102 0 0 - 7 20 50 19 4 45.9 28 121 -60 - 7 45 10 - 6 56 35 - 7 55 37 - 6 46 12 0.28 103 0 0 - 8 10 53 19 4 49.4 29 121 -58 - 8 35 17 - 7 46 32 - 8 45 47 - 7 36 7 0.28 104 0 0 - 9 1 14 19 4 53.0 30 121 -57 - 9 25 43 - 8 36 48 - 9 36 14 - 8 26 21 0.28 105 0 0 - 9 51 50 19 4 56.8 31 120 -56 -10 16 23 - 9 27 20 -10 26 56 - 9 16 51 0.28 106 0 0 -10 42 39 19 5 0.7 33 120 -54 -11 7 17 -10 18 6 -11 17 52 -10 7 35 0.28 107 0 0 -11 33 40 19 5 4.8 34 120 -53 -11 58 21 -11 9 2 -12 8 58 -10 58 30 0.28 108 0 0 -12 24 49 19 5 9.0 35 119 -52 -12 49 34 -12 0 8 -13 0 12 -11 49 34 0.28 109 0 0 -13 16 5 19 5 13.3 37 119 -50 -13 40 53 -12 51 21 -13 51 32 -12 40 46 0.28 110 0 0 -14 7 24 19 5 17.8 38 119 -49 -14 32 15 -13 42 38 -14 42 56 -13 32 1 0.28 111 0 0 -14 58 45 19 5 22.3 39 118 -48 -15 23 38 -14 33 56 -15 34 20 -14 23 19 0.28 112 0 0 -15 50 5 19 5 27.0 40 118 -46 -16 15 0 -15 25 14 -16 25 43 -15 14 36 0.28 113 0 0 -16 41 21 19 5 31.8 42 117 -45 -17 6 18 -16 16 28 -17 17 1 -16 5 49 0.28 114 0 0 -17 32 31 19 5 36.7 43 116 -44 -17 57 29 -17 7 37 -18 8 13 -16 56 57 0.28 115 0 0 -18 23 33 19 5 41.7 44 116 -43 -18 48 31 -17 58 38 -18 59 16 -17 47 58 0.28 116 0 0 -19 14 23 19 5 46.8 45 115 -41 -19 39 22 -18 49 27 -19 50 6 -18 38 47 0.28 117 0 0 -20 5 0 19 5 52.0 47 114 -40 -20 29 59 -19 40 4 -20 40 43 -19 29 24 0.28 118 0 0 -20 55 20 19 5 57.3 48 114 -39 -21 20 20 -20 30 25 -21 31 4 -20 19 45 0.28 119 0 0 -21 45 23 19 6 2.6 49 113 -38 -22 10 22 -21 20 29 -22 21 5 -21 9 49 0.28 120 0 0 -22 35 5 19 6 8.0 50 112 -36 -23 0 3 -22 10 12 -23 10 46 -21 59 33 0.28 121 0 0 -23 24 25 19 6 13.5 51 111 -35 -23 49 21 -22 59 33 -24 0 3 -22 48 54 0.28 122 0 0 -24 13 20 19 6 19.0 52 110 -34 -24 38 14 -23 48 30 -24 48 55 -23 37 52 0.28 123 0 0 -25 1 47 19 6 24.6 54 109 -33 -25 26 39 -24 37 0 -25 37 20 -24 26 23 0.28 124 0 0 -25 49 47 19 6 30.1 55 108 -31 -26 14 36 -25 25 1 -26 25 15 -25 14 25 0.28 125 0 0 -26 37 15 19 6 35.8 56 107 -30 -27 2 1 -26 12 33 -27 12 39 -26 1 58 0.28 126 0 0 -27 24 11 19 6 41.4 57 106 -29 -27 48 54 -26 59 32 -27 59 31 -26 48 59 0.28 127 0 0 -28 10 33 19 6 47.1 58 104 -28 -28 35 12 -27 45 58 -28 45 47 -27 35 26 0.28 128 0 0 -28 56 19 19 6 52.8 59 103 -27 -29 20 54 -28 31 48 -29 31 28 -28 21 18 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46 10 -44 39 19 -43 36 48 0.28 154 0 0 -44 34 47 19 9 10.3 75 31 -1 -44 56 34 -44 13 2 -45 5 55 -44 3 44 0.28 155 0 0 -45 0 50 19 9 14.9 74 27 0 -45 22 30 -44 39 13 -45 31 48 -44 29 57 0.28 156 0 0 -45 26 11 19 9 19.5 74 24 1 -45 47 44 -45 4 41 -45 56 59 -44 55 28 0.28 157 0 0 -45 50 50 19 9 24.0 74 20 1 -46 12 16 -45 29 27 -46 21 29 -45 20 17 0.28 158 0 0 -46 14 49 19 9 28.4 74 16 2 -46 36 8 -45 53 32 -46 45 17 -45 44 25 0.28 159 0 0 -46 38 6 19 9 32.7 74 13 3 -46 59 19 -46 16 56 -47 8 25 -46 7 52 0.28 160 0 0 -47 0 44 19 9 37.0 74 9 4 -47 21 50 -46 39 41 -47 30 53 -46 30 40 0.28 161 0 0 -47 22 43 19 9 41.3 73 6 4 -47 43 42 -47 1 46 -47 52 42 -46 52 47 0.28 162 0 0 -47 44 2 19 9 45.5 73 3 5 -48 4 55 -47 23 12 -48 13 53 -47 14 16 0.28 163 0 0 -48 4 43 19 9 49.6 73 360 6 -48 25 30 -47 43 59 -48 34 25 -47 35 6 0.28 164 0 0 -48 24 47 19 9 53.7 72 357 7 -48 45 27 -48 4 9 -48 54 20 -47 55 18 0.28 165 0 0 -48 44 13 19 9 57.7 72 354 7 -49 4 47 -48 23 41 -49 13 37 -48 14 53 0.28 166 0 0 -49 3 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41 -53 29 18 -52 51 10 -53 37 30 -52 43 1 0.28 -133 0 0 -53 1 9 19 12 57.9 39 268 42 -53 20 17 -52 42 2 -53 28 30 -52 33 51 0.28 -132 0 0 -52 51 36 19 13 0.2 38 267 42 -53 10 47 -52 32 26 -53 19 2 -52 24 13 0.28 -131 0 0 -52 41 35 19 13 2.4 38 267 43 -53 0 50 -52 22 21 -53 9 6 -52 14 7 0.28 -130 0 0 -52 31 5 19 13 4.6 37 266 43 -52 50 24 -52 11 48 -52 58 42 -52 3 32 0.28 -129 0 0 -52 20 7 19 13 6.8 36 265 44 -52 39 30 -52 0 46 -52 47 49 -51 52 29 0.28 -128 0 0 -52 8 40 19 13 8.9 36 264 44 -52 28 6 -51 49 15 -52 36 27 -51 40 55 0.28 -127 0 0 -51 56 43 19 13 11.1 35 263 45 -52 16 13 -51 37 13 -52 24 36 -51 28 52 0.28 -126 0 0 -51 44 16 19 13 13.2 35 262 45 -52 3 51 -51 24 42 -52 12 16 -51 16 19 0.28 -125 0 0 -51 31 18 19 13 15.3 34 261 46 -51 50 58 -51 11 40 -51 59 25 -51 3 16 0.28 -124 0 0 -51 17 50 19 13 17.4 33 260 46 -51 37 35 -50 58 8 -51 46 3 -50 49 41 0.28 -123 0 0 -51 3 51 19 13 19.5 33 260 47 -51 23 40 -50 44 4 -51 32 11 -50 35 35 0.28 -122 0 0 -50 49 20 19 13 21.6 32 259 47 -51 9 14 -50 29 28 -51 17 47 -50 20 57 0.28 -121 0 0 -50 34 17 19 13 23.6 31 258 48 -50 54 16 -50 14 20 -51 2 51 -50 5 47 0.28 -120 0 0 -50 18 42 19 13 25.6 31 257 48 -50 38 46 -49 58 39 -50 47 23 -49 50 4 0.28 -119 0 0 -50 2 33 19 13 27.6 30 256 49 -50 22 43 -49 42 26 -50 31 22 -49 33 49 0.28 -118 0 0 -49 45 51 19 13 29.6 29 255 49 -50 6 6 -49 25 39 -50 14 48 -49 16 59 0.28 -117 0 0 -49 28 36 19 13 31.5 28 255 50 -49 48 56 -49 8 17 -49 57 40 -48 59 35 0.28 -116 0 0 -49 10 45 19 13 33.5 28 254 50 -49 31 12 -48 50 22 -49 39 58 -48 41 37 0.28 -115 0 0 -48 52 20 19 13 35.4 27 253 51 -49 12 52 -48 31 51 -49 21 41 -48 23 4 0.28 -114 0 0 -48 33 20 19 13 37.3 26 252 51 -48 53 58 -48 12 45 -49 2 49 -48 3 55 0.28 -113 0 0 -48 13 44 19 13 39.1 26 251 52 -48 34 27 -47 53 2 -48 43 21 -47 44 10 0.29 -112 0 0 -47 53 31 19 13 40.9 25 250 52 -48 14 21 -47 32 44 -48 23 17 -47 23 49 0.29 -111 0 0 -47 32 41 19 13 42.7 24 250 53 -47 53 37 -47 11 48 -48 2 37 -47 2 51 0.29 -110 0 0 -47 11 15 19 13 44.5 23 249 53 -47 32 17 -46 50 15 -47 41 19 -46 41 15 0.29 -109 0 0 -46 49 10 19 13 46.2 23 248 54 -47 10 18 -46 28 4 -47 19 23 -46 19 1 0.29 -108 0 0 -46 26 27 19 13 47.9 22 247 54 -46 47 42 -46 5 14 -46 56 49 -45 56 9 0.29 -107 0 0 -46 3 5 19 13 49.5 21 247 55 -46 24 26 -45 41 46 -46 33 36 -45 32 38 0.29 -106 0 0 -45 39 3 19 13 51.1 20 246 55 -46 0 31 -45 17 38 -46 9 45 -45 8 27 0.29 -105 0 0 -45 14 22 19 13 52.7 19 245 55 -45 35 57 -44 52 50 -45 45 13 -44 43 37 0.29 -104 0 0 -44 49 1 19 13 54.2 19 244 56 -45 10 42 -44 27 22 -45 20 1 -44 18 6 0.29 -103 0 0 -44 22 59 19 13 55.7 18 244 56 -44 44 47 -44 1 13 -44 54 9 -43 51 54 0.29 -102 0 0 -43 56 16 19 13 57.2 17 243 57 -44 18 11 -43 34 24 -44 27 36 -43 25 2 0.30 -101 0 0 -43 28 52 19 13 58.5 16 242 57 -43 50 53 -43 6 53 -44 0 21 -42 57 28 0.30 -100 0 0 -43 0 45 19 13 59.9 15 242 57 -43 22 54 -42 38 40 -43 32 24 -42 29 12 0.30 - 99 0 0 -42 31 57 19 14 1.1 14 241 58 -42 54 12 -42 9 45 -43 3 46 -42 0 14 0.30 - 98 0 0 -42 2 26 19 14 2.3 13 240 58 -42 24 48 -41 40 7 -42 34 25 -41 30 33 0.30 - 97 0 0 -41 32 13 19 14 3.5 12 239 58 -41 54 42 -41 9 47 -42 4 21 -41 0 10 0.30 - 96 0 0 -41 1 16 19 14 4.6 12 239 59 -41 23 52 -40 38 44 -41 33 34 -40 29 4 0.31 - 95 0 0 -40 29 37 19 14 5.6 11 238 59 -40 52 19 -40 6 58 -41 2 5 -39 57 15 0.31 - 94 0 0 -39 57 14 19 14 6.5 10 237 59 -40 20 3 -39 34 28 -40 29 51 -39 24 43 0.31 - 93 0 0 -39 24 8 19 14 7.4 9 237 59 -39 47 4 -39 1 16 -39 56 55 -38 51 28 0.32 - 92 0 0 -38 50 19 19 14 8.2 8 236 59 -39 13 21 -38 27 20 -39 23 15 -38 17 29 0.32 - 91 0 0 -38 15 46 19 14 8.9 7 236 60 -38 38 55 -37 52 41 -38 48 51 -37 42 48 0.33 - 90 0 0 -37 40 30 19 14 9.5 6 235 60 -38 3 45 -37 17 19 -38 13 44 -37 7 23 0.34 - 89 0 0 -37 4 31 19 14 10.1 5 234 60 -37 27 52 -36 41 14 -37 37 54 -36 31 15 0.35 - 88 0 0 -36 27 49 19 14 10.5 4 234 60 -36 51 16 -36 4 26 -37 1 21 -35 54 25 0.37 - 87 0 0 -35 50 25 19 14 10.8 3 233 60 -36 13 58 -35 26 55 -36 24 5 -35 16 52 0.40 - 86 0 0 -35 12 19 19 14 11.1 2 233 60 -35 35 57 -34 48 43 -35 46 7 -34 38 37 0.47 - 85 0 0 -34 33 30 19 14 11.2 1 232 60 -34 57 15 -34 9 49 -35 7 26 -33 59 41 0.75 Uncertainty in time = +/- 1 secs Prediction of 2020 Dec 31.0 Data for the target star ------------------------ * name: TYC 7330-02592-1 * constellation : Lupus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 16 03 49.6938 DE: -30 58 16.628 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 16 03 49.6939 DE: -30 58 16.628 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 10.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (172) Baucis asteroid class: Barbarian approx. diameter [km]: 66 approx. diameter ["]: 0.040 distance from Earth [AU]: 2.28780 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: Preston date of fit: 2020 Dec 31 source of used astrometry: MPC, FASTT, TMO number of used observations: 2357 number of rejected observations: 8 time covered by the observations: 1961 Jan 12 - 2020 Jun 30 1 sigma uncertainty ellipse (major, minor, PA): 0.014", 0.008", 100.2° remarks: * orbital elements for (172)Baucis : Mean anomaly = 262.09149334 deg Arg. of pericenter = 359.77456846 deg Long. of node = 331.91862224 deg Inclination = 10.02088888 deg Eccentricity = 0.11452520 Semimajor axis = 2.37919944 AU Perihelion dist = 2.10672114 AU Mag: H = 8.70, G = 0.15 Epoch of elements : MJD 59265.79800000 TDT (2021 Feb 20.7980) ------ occelmnt file for Occult BEGIN ----------------------------------- Preston2020Dec31,3.2,2021,2,20,19.1529,-0.11213,-0.23537,10.41140,-4.97137,-0.00564,0.00107,0.00000,0.00000 163.0574,-31.0269,-103.88,-10.63,False TYC 7330-02592-1,16.06380383,-30.9712855,0.00,10.77,0.00,0.0,0,,16.08563663,-31.0268551 172,Baucis,13.56,66.2,2.2878,0,0,3.114,-19.11,,3.8 0,261.8772,2021,2,20,359.7746,331.9186,10.0209,0.11453,2.37920,2.10672,8.70,5.0,0.15 1.214,0.0140,0.0080,100,0.0086,Known errors 20210220_2592-1,59214.00 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2020 Dec 31, 01:35 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org