Sentences with phrase «distance estimates»

Stars A and B, however, have a wide separation of some 1,200 AUs — 165» at a HIPPARCOS distance estimate of 23.5 ly (Golimowski et al, 2000, in ps; Heintz and Cantor, 1994; Phillip A. Ianna, 1992; Martin and Ianna, 1975; and Sarah Lee Lippincott, 1973).

He noticed that the novae within M31 were about 10 magnitudes fainter than those observed elsewhere in the sky and came up with a new distance estimate for the object: 500,000 light years.

According to the new Sixth Catalog of Visual Orbits of Binary Stars, Stars A and B are separated on average by less than 0.11 AU (a = 0.0098» at a HIPPARCOS distance estimate of 35.4 ly).

As with kinematic distance estimates, there are a number of problems with this photometric approach.

We combine this dataset with distance estimates... ▽ More Our long term aim is to derive model - independent stellar masses and distances for long period massive binaries by combining apparent astrometric orbit with double - lined radial velocity amplitudes (SB2).

With our significantly improved distance estimates we can finally provide more meaningful values for many key parameters of scientific interest.»

«Follow - up spectroscopic observations are now needed to verify that the object is far more distant than the lensing galaxy, as well as to derive better distance estimates to confirm that multiple images really belong to the same object,» says Ratnatunga.

The two main techniques were kinematic and photometric distance estimates.

[1] Fich and Blitz give a compatible distance estimate of 3510 ± 980 pc.

Infrared star clusters will be added to a future version of the galaxy map where distance estimates are available.

Currently the most accurate distance estimate of WISE 1828 +2650 is a trigonometric parallax, measured using Spitzer Space Telescope and published in 2013 by Trent Dupuy and Adam Kraus: 0.070 ± 0.014 arcsec, corresponding to a distance 14.3 +3.6 − 2.4 pc, or 46.6 +11.6 − 7.8 ly.

Eventually, the company said they've identified a bug in the software on Charge 2 that causes inaccurate distance estimates when using Connected GPS to track the Walk and Hike activities.

«Rate and distance estimates for FRBs suggest that, whatever they are, they are a relatively common phenomenon, occurring somewhere in the universe more than 2,000 times a day.»

You can read more about kinematic distance estimates and view images illustrating two of the major velocity data sets available in the chapter on Velocity.

In addition, thanks to VERA, we have a good distance estimate to Source I.

On the whole, recent VLBI parallax measurements have shown that photometric distance estimates, when available, tend to be considerably more accurate than kinematic estimates.

Zeta1 has a brighter but distant stellar companion, Zeta2 Reticuli, currently located around 3,750 AUs away (based on an observed separation of 310» and HIPPARCOS distance estimates of 39.40 to 39.53 ly), with common proper motion and equal radial velocities (Da Silva and Foy, 1987).

But plasma within an FRB's host galaxy should contribute to the dispersion, too, muddying the distance estimates for any given FRB.

That threw off distance estimates to some stars that Hubble used to estimate the expansion rate.

In fact, taking future infrared observations of new instruments like the James Webb Space Telescope into account, distance estimates may even become much more precise.

But new observations by NASA's Spitzer Space Telescope now indicate that these distance estimates may be influenced by unexpected properties of cepheids.

Because this angle dictates how much gravitational - wave energy is emitted in Earth's direction, combining polarization with other data allowed researchers to derive a more precise estimate of total energy released by the event and so reduce the error in their distance estimate.

Members of Zitrin's team not only performed the color - analysis technique, but they also took advantage of the multiple images produced by the gravitational lens to independently confirm their distance estimate.

«It also matches the distance estimate we calculated, based on the color - analysis technique.

In the past, distance estimates for the Virgo cluster have ranged from about 40 to 70 million light years.

The distance estimates in these molecular cloud catalogs are only rough estimates and often many clouds are assigned the same distance.

For much of the second half of the twentieth century (and especially in the 1950s and 1960s) it was believed that kinematic distance estimates could map the Milky Way.

However, no distance estimates are available and according to SIMBAD, no references in the scientific literature have ever been made to this nebula beyond the RCW catalog itself.

A very clear description of the process used to make kinematic distance estimates (including the formulas used) can be found in this recent paper.

Of course astronomers have always known that the assumptions behind kinematic distance estimates were not always true.

Many astronomers believe that the Milky Way has four major spiral arms and this is certainly what appears in the atomic hydrogen data as I describe in the chapter on kinematic distance estimates.

It is now known from other distance estimates (especially those now available from VLBI parallax) that the main assumptions behind many kinematic distance estimates were incorrect.

An annual parallax shift of 39.48 [1] mas provides a distance estimate of 83 light years.

Star A has an average separation of about 80.5 AUs from its binary companion «B» — a semi-major axis of 16.2» at a HIPPARCOS distance estimate of 31.1 ly (Poveda et al, 1994, pp. 68 - 69).

According to new measurements (Staffan Soderhjelm, 1999) found in the new Sixth Catalog of Visual Orbits of Binary Stars, Stars A and B are separated by an «average distance» of about 48.5 AUs (semi-major axis of 3.8» with a HIPPARCOS distance estimate of 41.6 ly), or more than the average of orbital distance of Pluto in the Solar System.

It is only in recent years that distance estimates have become good enough to show that these two galaxies are definite members of the M101 group.

HD 147513 A is a so - called young «Barium dwarf» (s - process element rich but comparatively carbon deficient) star that was probably enriched by an asymptotic branch giant (AGB) star (see Gacrux) but is now a very dim, white dwarf companion, which has an observed separation of around 4,400 AUs — 5.7» at a HIPPARCOS distance estimate of 42.0 ly (Porto de Mello and da Silva, 1997; and Poveda et al, 1993, pp. 74 - 75).

It also has around 150 times Sol's luminosity (based on a Johnson Vmag of 0.87 at a HIPPARCOS distance estimate of 65.12 ly), but this may increase to around 170 times Sol's.

Note that the distance estimate is an upper limit and does not take into account the direction or extent of horizontal drilling underground, which would decrease the estimated distances to some extraction activities.

When she came off the stage she sometimes put her hand on the stage and jumped off it, a distance estimated by him to be about four feet.