2023RNAAS...7..121S

Query : 2023RNAAS...7..121S

2023RNAAS...7..121S - Research Notes of the AAS, 7, 121 (2023/June-0)

Improving MCMC Convergence for Joint Astrometry and Radial Velocity Orbit-fits Through Reparameterization.

SURTI T., HIRSCH L., MADAYEN T., ALI Z., NIELSEN E., BLUNT S., WANG J., FERRER-CHAVEZ R. and MACINTOSH B.

Abstract (from CDS):

The exoplanet orbit-fitting software package orbitize! was initially designed to fit the orbits of directly imaged planets with relative astrometric measurements using a Markov Chain Monte Carlo (MCMC) algorithm. Since the publication of orbitize! v1.0, the ability to jointly fit radial velocities and astrometry has been incorporated. We first implemented a Basis class into orbitize! that enables users to add and fit in various orbit parameterizations. We then introduced a radial velocity-focused parameterization of the Keplerian orbital elements for the joint radial velocity and astrometry fits. We compared MCMC convergence speeds of the new radial velocity-focused basis to the original orbitize! standard basis for the system HD 190771, which has full orbital coverage in radial velocity data. We found a 16% faster convergence in time with the radial velocity-focused basis. We encourage users to consider using this basis when doing joint radial velocity and astrometry fits.

Abstract Copyright: © 2023. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Orbits - Spectroscopic binary stars - Visual binary stars - Exoplanet dynamics

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 HD 190771 PM* 20 05 09.7757965056 +38 28 42.555790200   6.82   5.8   G2V 197 0

Query : 2023RNAAS...7..121S

Basic data :
HD 190771 -- High Proper Motion Star
Other object types: otypes_help 		* (2013A&A,AG,...), ** (**,ADS,...), PM* (2016ApJ,LTT,...), X (2E,1RXS), NIR (2MASS), MIR (WISEA), IR (IRAS)
ICRS coord. (ep=J2000) : 		20 05 09.7757965056 +38 28 42.555790200 (Optical) [ 0.0228 0.0241 90 ] A 2020yCat.1350....0G
FK4 coord. (ep=B1950 eq=1950) : 		20 03 20.2629033498 +38 20 00.056605832 [ 0.0228 0.0241 90 ]
Gal coord. (ep=J2000) : 		074.8428566383305 +03.6374611254572 [ 0.0228 0.0241 90 ]
Proper motions mas/yr : 		258.587 109.215 [0.031 0.033 90] A 2020yCat.1350....0G
Radial velocity / Redshift / cz : 		V(km/s) -25.133 [0.0025] / z(spectroscopic) -0.000084 [0.000000] / cz -25.13 [0.00]
   (Opt) A 2018A&A...616A...7S
Parallaxes (mas): 		52.5334 [0.0295] A 2020yCat.1350....0G
Spectral type: 		G2V C 2003AJ....126.2048G
Fluxes (6) :
B 6.82 [~] E ~
R 5.8 [~] E 2003AJ....125..984M
G 6.013729 [0.002805] C 2020yCat.1350....0G
J 4.92 [0.04] E 2003yCat.2246....0C
H 4.743 [0.036] C 2003yCat.2246....0C
K 4.621 [0.018] C 2003yCat.2246....0C
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Identifiers (49) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

LTT 15881 GCRV 12455 LF 3b +38 260 UBV 17235
** BU 1481A GEN# +1.00190771 LSPM J2005+3828 UBV M 24487
** WAL 126A GJ 1249 2MASS J20050978+3828424 USNO-B1.0 1284-00398228
ADS 13348 A GJ 9685 NLTT 48704 uvby98 100190771
AG+38 1956 GSC 03150-03061 PLX 4767.3 WDS J20052+3829A
ASCC 520860 HD 190771 PLX 4767.30 WEB 17559
BD+38 3896 HIC 98921 PPM 84163 WISEA J200509.99+382843.7
CCDM J20052+3829A HIP 98921 1RXS J200509.7+382838 Gaia DR3 2061876742143320064
CNS5 4976 HR 7683 SAO 69377 Gaia DR1 2061876737816679808
CSI+38 3896 1 IDS 20015+3811 A SKY# 37735 Gaia DR2 2061876742143320064
2E 4317 IRAS 20033+3820 SPOCS 873
2E 2003.3+3819 KIC 3393677 TIC 274764311
GC 27876 LAL 38451 TYC 3150-3061-1

References (197 between 1850 and 2026) (Total 197)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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Collections of Measurements Description of Measurements

Velocities : 8    Distance : 2    Rot : 8    Fe/H : 22    Plx : 6    PM : 8    SpT : 4   

   

External archives :

Archive data at HEASARC - High-Energy Astrophysics Science Archive Research Center

Data at NED - NASA/IPAC Extragalactic Database : HD 190771

Link by name to the catalogue in VizieR :

AG+38 1956 BD+38 3896 CCDM J20052+3829A 2E 4317 GJ 1249
GJ 9685 GSC 03150-03061 HD 190771 HIC 98921 HIP 98921
HR 7683 IRAS 20033+3820 KIC 3393677 LF 3b +38 260 LSPM J2005+3828
2MASS J20050978+3828424 NLTT 48704 PPM 84163 1RXS J200509.7+382838 SAO 69377
TYC 3150-3061-1 USNO-B1.0 1284-00398228 uvby98 100190771 WDS J20052+3829A WISEA J200509.99+382843.7
Gaia DR3 2061876742143320064 Gaia DR1 2061876737816679808 Gaia DR2 2061876742143320064

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