Date Published

H0 km·s−1·Mpc−1

Observer

Remarks/Methodology

2020-09

67.6 4.2 + 4.3

S. Mukherjee, et al.

Gravitational waves, assuming that the transient ZTF19abanrh found by the Zwicky Transient Facility is the optical counterpart to GW190521. Independent of distance ladders and the cosmic microwave background.

2020-02

73.9 3.0 + 3.0

Megamaser Cosmology

Project

Geometric distance measurements to Megamaser-hosting galaxies. Independent of distance ladders and the cosmic microwave background.

2019-10

74.2 3.0 + 2.7

STRIDES

Modelling the mass distribution & time delay of the lensed quasar DES J0408-5354.

2019-09

76.8 2.6 + 2.6

SHARP

H0LiCOW

Modelling three galactically lensed objects and their lenses using ground-based adaptive optics and the Hubble Space Telescope

2019-08

70.3 1.35 + 1.36

K. Dutta, et al.

This is obtained analyzing low-redshift cosmological data within ΛCDM model. The datasets used are Type-Ia Supernova, Baryon Acoustic Oscillations, Time-Delay measurements using Strong-Lensing, measurements using Cosmic Chronometers and growth measurements from large scale structure observations.

2019-08

73.5 1.4 + 1.4

M. J. Reid,

D. W. Pesce,

A. G. Riess

Measuring the distance to Messier 106 using its supermassive black hole, combined with measurements of eclipsing binaries in the Large Magellanic Cloud.

2019-07

69.8 1.9 + 1.9

Hubble Space Telescope

Distances to red giant stars are calculated using the tip of the red-giant branch (TRGB) distance indicator.

2019-07

73.3 1.7 + 1.7

H0LiCOW

collaboration

Updated observations of multiply imaged quasars, now using six quasars, independent of the cosmic distance ladder and independent of the cosmic microwave background measurements.

2019-07

70.3 5.0 + 5.3

LIGO and Virgo

detectors

Uses radio counterpart of GW170817, combined with earlier gravitational wave and electromagnetic data.

2019-03

68.0 4.1 + 4.2

Fermi-LAT

Gamma ray attenuation due to extragalactic light. Independent of the cosmic distance ladder and the cosmic microwave background.

2019-03

74.03 1.42 + 1.42

Hubble Space Telescope

Precision HST photometry of Cepheids in the Large Magellanic Cloud (LMC) reduce the uncertainty in the distance to the LMC from 2.5% to 1.3%. The revision increases the tension with CMB measurements to the 4.4σ level (P = 99.999% for Gaussian errors), raising the discrepancy beyond a plausible level of chance. Continuation of a collaboration known as Supernovae, for the Equation of State of Dark Energy (SHoES).

2019-02

67.78 0.87 + 0.91

Joseph Ryan, et al.

Quasar angular size and baryon acoustic oscillations, assuming a flat LambdaCDM model. Alternative models result in different (generally lower) values for the Hubble constant.