IOTA/IOTA-ES occultation update for (1791) Patsayev / UCAC4 354-079832 event on 2021 Mar 10, 19:37 UT Visible from N Australia Summary ------- On 2021 Mar 10 UT, the 29.5382408934577 km diameter asteroid (1791) Patsayev will occult a 7.3 mag star in the constellation Ophiuchus for observers along a path across N Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 9.35 mag to 16.65 mag (the magnitude of the asteroid) for at most 2.1 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: 50 * date and approx. time of event: 2021 Mar 10, 19:30 - 2021 Mar 10, 19:44 * geocentric midpoint of event [JD]: 2459284.31765833 * magnitude of target star: 7.30 * magnitude drop [mag]: 9.35 * estimated maximum duration [s]: 2.1 * Moon: 7 % sunlit, 66° distance * Sun: 97° distance * rough path description: N Australia The occultation path -------------------- * approximate projected width [km]: 34 * 1 sigma uncertainty interval [path widths]: +/- 1.28 * 1 sigma uncertainty interval [seconds]: +/- 1.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.015, +/- 0.029) * 1 sigma uncertainty ellipse (major, minor, PA): (0.029", 0.015", 176°) * approx speed of asteroid's shadow [km/s]: 16.1143 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 354-079832 by 1791 Patsayev on 2021 Mar 10 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 61 0 0 - 3 35 15 19 30 50.7 1 109 -79 - 3 45 7 - 3 25 23 - 4 10 29 - 3 0 1 .... 62 0 0 - 3 56 19 19 30 50.9 2 109 -79 - 4 6 10 - 3 46 27 - 4 31 32 - 3 21 5 0.07 63 0 0 - 4 17 18 19 30 51.2 3 109 -79 - 4 27 9 - 4 7 26 - 4 52 31 - 3 42 5 0.05 64 0 0 - 4 38 12 19 30 51.7 4 109 -80 - 4 48 3 - 4 28 21 - 5 13 24 - 4 3 0 0.04 65 0 0 - 4 59 1 19 30 52.3 5 109 -80 - 5 8 52 - 4 49 10 - 5 34 12 - 4 23 50 0.03 66 0 0 - 5 19 44 19 30 53.0 6 109 -80 - 5 29 35 - 5 9 53 - 5 54 54 - 4 44 34 0.03 67 0 0 - 5 40 21 19 30 53.9 7 109 -80 - 5 50 11 - 5 30 30 - 6 15 30 - 5 5 12 0.03 68 0 0 - 6 0 51 19 30 54.9 8 109 -80 - 6 10 41 - 5 51 1 - 6 35 59 - 5 25 43 0.03 69 0 0 - 6 21 14 19 30 56.0 9 109 -80 - 6 31 4 - 6 11 24 - 6 56 21 - 5 46 8 0.02 70 0 0 - 6 41 29 19 30 57.3 10 108 -80 - 6 51 19 - 6 31 40 - 7 16 35 - 6 6 24 0.02 71 0 0 - 7 1 36 19 30 58.6 12 108 -79 - 7 11 26 - 6 51 47 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54.6 34 252 48 - 8 30 18 - 8 10 42 - 8 55 30 - 7 45 31 0.01 -154 0 0 - 8 0 49 19 42 58.6 33 252 49 - 8 10 38 - 7 51 1 - 8 35 51 - 7 25 48 0.01 -153 0 0 - 7 40 58 19 43 2.6 32 252 50 - 7 50 47 - 7 31 9 - 8 16 1 - 7 5 55 0.01 -152 0 0 - 7 20 58 19 43 6.4 31 252 51 - 7 30 47 - 7 11 8 - 7 56 2 - 6 45 53 0.02 -151 0 0 - 7 0 48 19 43 10.1 30 252 52 - 7 10 37 - 6 50 58 - 7 35 54 - 6 25 42 0.02 -150 0 0 - 6 40 29 19 43 13.7 29 252 53 - 6 50 19 - 6 30 39 - 7 15 36 - 6 5 22 0.02 -149 0 0 - 6 20 2 19 43 17.1 28 251 54 - 6 29 53 - 6 10 12 - 6 55 11 - 5 44 54 0.02 -148 0 0 - 5 59 27 19 43 20.5 27 251 55 - 6 9 18 - 5 49 37 - 6 34 37 - 5 24 18 0.02 -147 0 0 - 5 38 45 19 43 23.7 25 251 56 - 5 48 36 - 5 28 54 - 6 13 56 - 5 3 34 0.02 -146 0 0 - 5 17 56 19 43 26.8 24 251 57 - 5 27 48 - 5 8 5 - 5 53 8 - 4 42 44 0.02 -145 0 0 - 4 57 1 19 43 29.8 23 251 58 - 5 6 53 - 4 47 9 - 5 32 14 - 4 21 48 0.02 -144 0 0 - 4 35 59 19 43 32.7 22 251 59 - 4 45 51 - 4 26 7 - 5 11 14 - 4 0 45 0.02 -143 0 0 - 4 14 53 19 43 35.4 21 251 60 - 4 24 45 - 4 5 0 - 4 50 8 - 3 39 38 0.02 -142 0 0 - 3 53 41 19 43 38.0 20 251 61 - 4 3 33 - 3 43 48 - 4 28 57 - 3 18 25 0.02 -141 0 0 - 3 32 25 19 43 40.5 19 251 62 - 3 42 17 - 3 22 32 - 4 7 41 - 2 57 8 0.02 -140 0 0 - 3 11 4 19 43 42.8 18 251 63 - 3 20 57 - 3 1 11 - 3 46 21 - 2 35 47 0.02 -139 0 0 - 2 49 41 19 43 45.0 17 251 64 - 2 59 34 - 2 39 48 - 3 24 58 - 2 14 23 0.02 -138 0 0 - 2 28 14 19 43 47.1 16 251 65 - 2 38 7 - 2 18 21 - 3 3 32 - 1 52 56 0.02 -137 0 0 - 2 6 45 19 43 49.1 15 251 66 - 2 16 38 - 1 56 52 - 2 42 3 - 1 31 27 0.02 -136 0 0 - 1 45 14 19 43 50.9 14 251 67 - 1 55 7 - 1 35 21 - 2 20 33 - 1 9 55 0.02 -135 0 0 - 1 23 41 19 43 52.6 13 251 68 - 1 33 35 - 1 13 48 - 1 59 0 - 0 48 23 0.02 -134 0 0 - 1 2 8 19 43 54.1 12 251 69 - 1 12 1 - 0 52 15 - 1 37 27 - 0 26 49 0.02 -133 0 0 - 0 40 34 19 43 55.6 11 250 70 - 0 50 27 - 0 30 41 - 1 15 53 - 0 5 15 0.03 -132 0 0 - 0 19 0 19 43 56.8 9 250 71 - 0 28 54 - 0 9 7 - 0 54 19 0 16 18 0.03 -131 0 0 0 2 33 19 43 58.0 8 250 72 - 0 7 20 0 12 26 - 0 32 46 0 37 51 0.03 -130 0 0 0 24 5 19 43 59.0 7 250 73 0 14 12 0 33 58 - 0 11 14 0 59 23 0.03 -129 0 0 0 45 36 19 43 59.9 6 250 74 0 35 42 0 55 29 0 10 17 1 20 54 0.03 -128 0 0 1 7 4 19 44 0.6 5 251 75 0 57 11 1 16 57 0 31 46 1 42 22 0.04 -127 0 0 1 28 30 19 44 1.2 4 251 75 1 18 37 1 38 23 0 53 13 2 3 47 0.04 -126 0 0 1 49 53 19 44 1.7 3 251 76 1 40 0 1 59 46 1 14 36 2 25 9 0.05 -125 0 0 2 11 12 19 44 2.0 2 251 77 2 1 20 2 21 5 1 35 56 2 46 28 0.08 -124 0 0 2 32 28 19 44 2.2 1 251 78 2 22 35 2 42 20 1 57 12 3 7 43 0.15 Uncertainty in time = +/- 3 secs Prediction of 2021 Feb 28.0 Data for the target star ------------------------ * name: UCAC4 354-079832 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 16 49 15.2170 DE: -19 15 26.794 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 16 49 15.2172 DE: -19 15 26.795 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 7.3 * B mag [mag]: 9.3 * Diameter [mas]: 3.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1791) Patsayev asteroid class: approx. diameter [km]: 30 approx. diameter ["]: 0.019 distance from Earth [AU]: 2.11790 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#42 date of fit: 2021 Feb 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): 0.029", 0.015", -3.537° remarks: * orbital elements for (1791)Patsayev : Mean anomaly = 326.34325331 deg Arg. of pericenter = 74.83394252 deg Long. of node = 198.86699710 deg Inclination = 5.36943950 deg Eccentricity = 0.14134178 Semimajor axis = 2.74679388 AU Perihelion dist = 2.35855714 AU Mag: H = 11.96, G = 0.15 Epoch of elements : MJD 59283.81760417 TDT (2021 Mar 10.8176) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#422021Feb24,2.1,2021,3,10,19.6238,-0.00180,-0.00380,9.08097,0.51169,-0.00565,0.00064,0.00000,0.00000 149.5687,-19.2936,-111.82,-3.78,False UCAC4 354-079832,16.82089363,-19.2574429,9.30,7.30,6.22,3.1,0,,16.84134342,-19.2936272 1791,Patsayev,16.65,34.3,2.1179,0,0,2.664,2.12,,1.8 0,326.1662,2021,3,10,74.8339,198.8670,5.3694,0.14134,2.74679,2.35856,11.96,5.0,0.15 2.286,0.0287,0.0147,176,0.0287,Known errors,-1.00,-1,-1,-1 20210310_079832,59273.00 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2021 Feb 28, 21:45 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org