<system>
	<name>TOI-561</name>
	<rightascension>09 52 44</rightascension>
	<declination>+06 12 58</declination>
	<distance errorminus="0.49" errorplus="0.50">85.80</distance>
	<star>
		<name>TOI-561</name>
		<radius errorminus="0.01" errorplus="0.01">0.85</radius>
		<magJ errorminus="0.011" errorplus="0.011">8.879</magJ>
		<magH errorminus="0.053" errorplus="0.053">8.504</magH>
		<magK errorminus="0.017" errorplus="0.017">8.394</magK>
		<mass errorminus="0.02" errorplus="0.02">0.79</mass>
		<temperature errorminus="47.00" errorplus="65.00">5455.00</temperature>
		<metallicity errorminus="0.050" errorplus="0.100">-0.330</metallicity>
		<spectraltype>G9V</spectraltype>
		<planet>
			<name>TOI-561 b</name>
			<semimajoraxis errorminus="0.000080" errorplus="0.000080">0.010550</semimajoraxis>
			<eccentricity>0.000000</eccentricity>
			<periastron>90.0000</periastron>
			<inclination errorminus="2.800" errorplus="2.100">87.000</inclination>
			<period errorminus="0.00001700" errorplus="0.00001700">0.44657800</period>
			<description>TOI-561 belongs to a rare population of stars called the galactic thick disk.  Thick disk stars are chemically distinct, with fewer trace heavy elements (and especially less iron) than typical stars of the Milky Way, suggesting they formed early, approximately 10 billion years ago. This planet was discovered by Lacedelli et al. 2020. The discovery was made with a space based telescope (0.1 m TESS Telescope). The parameters listed here are those reported by Lacedelli et al. 2020 and were imported into the Open Exoplanet Catalogue from the NASA Exoplanet Archive.</description>
			<mass errorminus="0.00113" errorplus="0.00113">0.00500</mass>
			<radius errorminus="0.006" errorplus="0.006">0.127</radius>
			<discoverymethod>transit</discoverymethod>
			<istransiting>1</istransiting>
			<discoveryyear>2020</discoveryyear>
			<list>Confirmed planets</list>
			<lastupdate>21/01/11</lastupdate>
			<transittime errorminus="0.001000" errorplus="0.001000">2458517.498000</transittime>
			<image>TOI561</image>
			<imagedescription>Artist's rendition of TOI-561, one of the oldest, most metal-poor planetary systems discovered yet in the Milky Way galaxy. (Photo credit: W. M. Keck Observatory/Adam Makarenko)</imagedescription>
		</planet>
		<planet>
			<name>TOI-561 c</name>
			<semimajoraxis errorminus="0.000700" errorplus="0.000700">0.088090</semimajoraxis>
			<eccentricity errorminus="0.042000" errorplus="0.067000">0.060000</eccentricity>
			<periastron errorminus="49.0000" errorplus="55.0000">200.0000</periastron>
			<inclination errorminus="0.390" errorplus="0.320">89.530</inclination>
			<period errorminus="0.00400000" errorplus="0.00400000">10.77900000</period>
			<description>TOI-561 belongs to a rare population of stars called the galactic thick disk.  Thick disk stars are chemically distinct, with fewer trace heavy elements (and especially less iron) than typical stars of the Milky Way, suggesting they formed early, approximately 10 billion years ago. This planet was discovered by Lacedelli et al. 2020. The discovery was made with a space based telescope (0.1 m TESS Telescope). The parameters listed here are those reported by Lacedelli et al. 2020 and were imported into the Open Exoplanet Catalogue from the NASA Exoplanet Archive.</description>
			<mass errorminus="0.00308" errorplus="0.00308">0.01699</mass>
			<radius errorminus="0.009" errorplus="0.009">0.257</radius>
			<discoverymethod>transit</discoverymethod>
			<istransiting>1</istransiting>
			<discoveryyear>2020</discoveryyear>
			<list>Confirmed planets</list>
			<lastupdate>21/01/11</lastupdate>
			<transittime errorminus="0.004000" errorplus="0.004000">2458527.060000</transittime>
		</planet>
		<planet>
			<name>TOI-561 d</name>
			<semimajoraxis errorminus="0.001200" errorplus="0.001200">0.156900</semimajoraxis>
			<eccentricity errorminus="0.036000" errorplus="0.064000">0.051000</eccentricity>
			<periastron errorminus="124.0000" errorplus="67.0000">246.0000</periastron>
			<inclination errorminus="0.210" errorplus="0.280">89.540</inclination>
			<period errorminus="0.04000000" errorplus="0.04000000">25.62000000</period>
			<description>This planet was discovered by Lacedelli et al. 2020. The discovery was made with a space based telescope (0.1 m TESS Telescope). The parameters listed here are those reported by Lacedelli et al. 2020 and were imported into the Open Exoplanet Catalogue from the NASA Exoplanet Archive.</description>
			<mass errorminus="0.00403" errorplus="0.00403">0.03760</mass>
			<radius errorminus="0.012" errorplus="0.012">0.226</radius>
			<discoverymethod>transit</discoverymethod>
			<istransiting>1</istransiting>
			<discoveryyear>2020</discoveryyear>
			<list>Controversial</list>
			<lastupdate>21/01/11</lastupdate>
			<transittime errorminus="0.004000" errorplus="0.004000">2458521.882000</transittime>
		</planet>
		<planet>
			<name>TOI-561 e</name>
			<semimajoraxis errorminus="0.002700" errorplus="0.002800">0.327400</semimajoraxis>
			<eccentricity errorminus="0.042000" errorplus="0.051000">0.061000</eccentricity>
			<periastron errorminus="83.0000" errorplus="83.0000">155.0000</periastron>
			<inclination errorminus="0.080" errorplus="0.140">89.750</inclination>
			<period errorminus="0.39000000" errorplus="0.39000000">77.23000000</period>
			<description>This planet was discovered by Lacedelli et al. 2020. The discovery was made with a space based telescope (0.1 m TESS Telescope). The parameters listed here are those reported by Lacedelli et al. 2020 and were imported into the Open Exoplanet Catalogue from the NASA Exoplanet Archive.</description>
			<mass errorminus="0.00724" errorplus="0.00724">0.05034</mass>
			<radius errorminus="0.010" errorplus="0.010">0.238</radius>
			<discoverymethod>transit</discoverymethod>
			<istransiting>1</istransiting>
			<discoveryyear>2020</discoveryyear>
			<list>Controversial</list>
			<lastupdate>21/01/11</lastupdate>
			<transittime errorminus="0.004000" errorplus="0.004000">2458538.181000</transittime>
		</planet>
		<planet>
			<name>TOI-561 f</name>
			<semimajoraxis errorminus="0.001500" errorplus="0.001500">0.117400</semimajoraxis>
			<eccentricity>0.000000</eccentricity>
			<period errorminus="0.00500000" errorplus="0.00500000">16.28700000</period>
			<description>This planet was discovered by Weiss et al. 2020. The discovery was made with a space based telescope (0.1 m TESS Telescope). The parameters listed here are those reported by Weiss et al. 2020 and were imported into the Open Exoplanet Catalogue from the NASA Exoplanet Archive.</description>
			<mass errorminus="0.00598" errorplus="0.00755">0.00944</mass>
			<radius errorminus="0.014" errorplus="0.014">0.207</radius>
			<temperature errorminus="60" errorplus="60">750</temperature>
			<discoverymethod>transit</discoverymethod>
			<istransiting>1</istransiting>
			<discoveryyear>2020</discoveryyear>
			<list>Controversial</list>
			<lastupdate>21/01/11</lastupdate>
			<transittime errorminus="0.003500" errorplus="0.003500">2458521.882800</transittime>
		</planet>
	</star>
	<constellation>Sextans</constellation>
</system>
