IOTA/IOTA-ES occultation update for (306) Unitas / TYC 5613-01182-1 event on 2022 May 12, 16:32 UT Visible from Australia Summary ------- On 2022 May 12 UT, the 47.7 km diameter asteroid (306) Unitas will occult a 11.2 mag star in the constellation Ophiuchus 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 0.94 mag to 11.52 mag (the magnitude of the asteroid) for at most 5.830 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: 91 * date and approx. time of event: 2022 May 12, 16:19 - 2022 May 12, 16:45 * geocentric midpoint of event [JD]: 2459712.18926904 * magnitude of target star: 11.18 * magnitude drop [mag]: 0.94 * estimated maximum duration [s]: 5.830 * Moon: 85 % sunlit, 57° distance * Sun: 163° distance * rough path description: Australia Additional comments ------------------- RUWE high The occultation path -------------------- * approximate projected width [km]: 48 * 1 sigma uncertainty interval [path widths]: +/- 0.51 * 1 sigma uncertainty interval [seconds]: +/- 4.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.045, +/- 0.028) * 1 sigma uncertainty ellipse (major, minor, PA): (0.046", 0.027", 101°) * approx speed of asteroid's shadow [km/s]: 8.1754 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5613-01182-1 by 306 Unitas on 2022 May 12 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 34 0 0 6 58 4 16 45 20.0 1 98 -13 7 11 20 6 44 47 7 24 43 6 31 22 .... 35 0 0 6 49 15 16 45 19.6 2 98 -14 7 2 31 6 35 58 7 15 56 6 22 32 0.16 36 0 0 6 40 8 16 45 19.1 3 98 -15 6 53 24 6 26 50 7 6 49 6 13 24 0.16 37 0 0 6 30 41 16 45 18.2 4 98 -16 6 43 59 6 17 23 6 57 24 6 3 56 0.17 38 0 0 6 20 56 16 45 17.2 5 99 -17 6 34 15 6 7 38 6 47 41 5 54 10 0.17 39 0 0 6 10 53 16 45 15.9 6 99 -18 6 24 12 5 57 34 6 37 39 5 44 6 0.17 40 0 0 6 0 32 16 45 14.3 7 99 -19 6 13 51 5 47 12 6 27 19 5 33 43 0.17 41 0 0 5 49 53 16 45 12.5 8 99 -20 6 3 13 5 36 32 6 16 41 5 23 3 0.17 42 0 0 5 38 56 16 45 10.5 9 99 -21 5 52 16 5 25 34 6 5 45 5 12 4 0.17 43 0 0 5 27 41 16 45 8.3 10 99 -22 5 41 3 5 14 19 5 54 32 5 0 48 0.17 44 0 0 5 16 9 16 45 5.7 11 99 -23 5 29 31 5 2 46 5 43 1 4 49 15 0.17 45 0 0 5 4 20 16 45 3.0 12 99 -24 5 17 43 4 50 57 5 31 13 4 37 24 0.17 46 0 0 4 52 14 16 45 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20 16 20 11.5 15 269 -7 -29 3 11 -29 29 29 -28 49 54 -29 42 47 0.19 -153 0 0 -29 12 49 16 20 8.6 14 269 -6 -28 59 40 -29 25 59 -28 46 24 -29 39 17 0.19 -152 0 0 -29 9 1 16 20 5.8 13 268 -5 -28 55 52 -29 22 11 -28 42 35 -29 35 30 0.19 -151 0 0 -29 4 55 16 20 3.2 12 268 -5 -28 51 46 -29 18 5 -28 38 28 -29 31 24 0.19 -150 0 0 -29 0 31 16 20 0.8 11 267 -4 -28 47 21 -29 13 42 -28 34 4 -29 27 1 0.19 -149 0 0 -28 55 49 16 19 58.5 10 267 -3 -28 42 39 -29 9 0 -28 29 21 -29 22 20 0.19 -148 0 0 -28 50 49 16 19 56.4 9 266 -2 -28 37 39 -29 4 0 -28 24 20 -29 17 20 0.19 -147 0 0 -28 45 31 16 19 54.5 9 266 -1 -28 32 20 -28 58 43 -28 19 1 -29 12 3 0.19 -146 0 0 -28 39 55 16 19 52.8 8 265 0 -28 26 43 -28 53 7 -28 13 24 -29 6 28 0.19 -145 0 0 -28 34 1 16 19 51.3 7 265 0 -28 20 49 -28 47 13 -28 7 29 -29 0 35 0.19 -144 0 0 -28 27 48 16 19 49.9 6 264 1 -28 14 36 -28 41 1 -28 1 16 -28 54 23 0.20 -143 0 0 -28 21 18 16 19 48.7 5 264 2 -28 8 5 -28 34 31 -27 54 44 -28 47 54 0.20 -142 0 0 -28 14 29 16 19 47.7 4 263 3 -28 1 16 -28 27 43 -27 47 55 -28 41 6 0.21 -141 0 0 -28 7 23 16 19 46.9 3 263 4 -27 54 9 -28 20 37 -27 40 47 -28 34 1 0.21 -140 0 0 -27 59 58 16 19 46.3 2 262 5 -27 46 43 -28 13 13 -27 33 21 -28 26 37 0.23 -139 0 0 -27 52 15 16 19 45.9 2 262 6 -27 39 0 -28 5 31 -27 25 37 -28 18 55 0.26 -138 0 0 -27 44 14 16 19 45.7 1 261 6 -27 30 58 -27 57 30 -27 17 34 -28 10 55 0.39 Uncertainty in time = +/- 5 secs Prediction of 2022 Apr 15.8 Data for the target star ------------------------ * name: TYC 5613-01182-1 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 16 14 24.5676 DE: -07 50 12.507 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 16 14 24.5676 DE: -07 50 12.506 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.400,0.300) * V mag [mag]: 11.2 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (306) Unitas asteroid class: approx. diameter [km]: 48 approx. diameter ["]: 0.054 distance from Earth [AU]: 1.21790 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#53 date of fit: 2022 Apr 11 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): 0.046", 0.027", 101.296° remarks: * orbital elements for (306)Unitas : Mean anomaly = 303.6743292841 deg Arg. of pericenter = 168.0893460755 deg Long. of node = 141.8562692335 deg Inclination = 7.2779750948 deg Eccentricity = 0.1507335262 Semimajor axis = 2.3578952051 AU Perihelion dist = 2.0024813465 AU Mag: H = 8.89, G = 0.15 Epoch of elements : MJD 59711.68923611 TDT (2022 May 12.6892) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#532022Apr11,5.83,2022,5,12,16.542457,-0.053990,-0.170835,-4.402360,1.382854,-0.001229,-0.000984,0.000001,0.000000 125.3433,-7.8938,-69.04,18.25,False TYC 5613-01182-1,16.24015768,-7.8368073,0.00,11.18,0.00,0.0,0,,16.26037657,-7.8937908,0.94,0.00,0,0,0 306,Unitas,11.52,47.7,1.2179,0,0,-2.140,9.98,,2.4 0,303.4867,2022,5,12,168.0893,141.8563,7.2780,0.15073,2.35790,2.00248,8.82,5.0,0.15 1.505,0.0457,0.0270,101,0.0273,Known errors,-1.00,-1,-1,-1 20220512_1182-1,59684.83 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Apr 15, 19:52 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org