![]() Other noteworthy improvements include a 33% reduction in the systematic uncertainty in the maser distance to NGC 4258, a larger sample of Cepheids in the Large Magellanic Cloud (LMC), a more robust distance to the LMC based on late-type detached eclipsing binaries (DEBs), HST observations of Cepheids in M31, and new HST-based trigonometric parallaxes for Milky Way (MW) Cepheids. All 19 hosts as well as the megamaser system NGC 4258 have been observed with WFC3 in the optical and NIR, thus nullifying cross-instrument zeropoint errors in the relative distance estimates from Cepheids. ![]() The bulk of this improvement comes from new near-infrared (NIR) observations of Cepheid variables in 11 host galaxies of recent type Ia supernovae (SNe Ia), more than doubling the sample of reliable SNe Ia having a Cepheid-calibrated distance to a total of 19 these in turn leverage the magnitude-redshift relation based on ∼300 SNe Ia at z < 0.15. ![]() We use the Wide Field Camera 3 (WFC3) on the Hubble Space Telescope (HST) to reduce the uncertainty in the local value of the Hubble constant from 3.3% to 2.4%. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, USAĭepartment of Astronomy, University of Texas, Austin, TX, USAĪstrophysical Institute, Department of Physics and Astronomy, Ohio University, Athens, OH, USAĭepartment of Physics, University of Illinois at Urbana-Champaign, Urbana, IL, USAĭepartment of Astronomy, University of Illinois at Urbana-Champaign, Urbana, IL, USA The Research School of Astronomy and Astrophysics, Australian National University, Mount Stromlo Observatory, Weston Creek, ACT, Australia Kavli Institute for Cosmological Physics, University of Chicago, Chicago, IL, USAĭepartment of Astronomy, University of California, Berkeley, CA, USA and Cynthia Woods Mitchell Institute for Fundamental Physics and Astronomy, Department of Physics & Astronomy, Texas A&M University, College Station, TX, USA Even if it didn't last and I knew how long it would, I'd be more likely to use it than not knowing exactly whats going on.Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD, USA Telescope Science Institute, Baltimore, MD, USA Wish the site had hard facts on the product like this. 6.0 goes to 6.5 then down to 6.0 again? If not, is the maintenance rate of 5 lbs/k needed to maintain?Īlso, anyone that can confirm a benefit to applying 12 lbs soul-cal and 38 lbs calcitic lime if soil test calls for 50 lbs calcium carbonate/1000 to raise quickly and sustain pH longer? ![]() I have read that it can work as fast as 2 weeks, although I am assuming sandy soils and aeration.Ĭan anyone confirm through practice that pH change does not last? Soil tests done 5 months after application and 12 months after? If I use Solu-cal at 12 lbs/1000 amendment rate, do I need to do this every year to maintain the pH change? ex. If I use Solu-Cal to raise pH, from what I've read (on this site, don't see info on solu-cal site) the pH will correct sooner and diminish again in under a year. I have done a search and while people remark on Solu-cal's short-lived pH adjustment I haven't seen any clear explanation.
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