Update Hipparcos catalog: 118,218 stars

README.md

@@ -53,84 +53,16 @@ The scientific legacy of Hipparcos extends far beyond simple distance measuremen
 
 | Column | Type | Description | Sample | Null % |
 |--------|------|-------------|--------|--------|
-| `recno` | int64 |  | 1 | 0.0% |
 | `hip_id` | Int64 | Hipparcos Input Catalog identifier; integer in range 1–120404; the standard cross-reference identifier for stars brighter than ~12 mag observed by the Hipparcos satellite (1989–1993); still widely used to cross-match with Gaia and Tycho-2 | 1 | 0.0% |
-| `Proxy` | object |  |   | 0.0% |
-| `RAhms` | object |  | 00 00 00.22 | 0.0% |
-| `DEdms` | object |  | +01 05 20.4 | 0.0% |
 | `v_magnitude` | float64 | Johnson V-band apparent magnitude; higher values are fainter; catalog covers roughly V = 2–12.4 mag; null for stars with only Hp-band photometry | 9.1 | 0.0% |
-| `VarFlag` | float64 |  | 3.0 | 90.2% |
-| `r_Vmag` | object |  | H | 0.0% |
 | `ra_deg` | float64 | Right ascension in degrees, ICRS at reference epoch J1991.25 (the astrometric midpoint of the Hipparcos mission, not J2000.0); range 0–360; differs from J2000.0 by a small proper-motion correction that grows with stellar velocity | 0.00091185 | 0.2% |
 | `dec_deg` | float64 | Declination in degrees, ICRS at reference epoch J1991.25; range −90 to +90; positive north of the celestial equator | 1.08901332 | 0.2% |
-| `AstroRef` | object |  |   | 0.0% |
 | `parallax_mas` | float64 | Trigonometric parallax in milliarcseconds; convert to distance via distance_pc = 1000 / parallax_mas; Hipparcos precision ~1 mas (cf. Gaia ~0.02 mas); negative values are physically meaningful measurement noise for distant stars where the true parallax is near zero | 3.54 | 0.2% |
 | `proper_motion_ra_mas_yr` | float64 | Proper motion in right ascension in milliarcseconds per year, with the cos(dec) factor already applied so this is the true angular rate on the sky (not the coordinate rate); positive = eastward motion | -5.2 | 0.2% |
 | `proper_motion_dec_mas_yr` | float64 | Proper motion in declination in milliarcseconds per year; positive = northward motion; combined with proper_motion_ra_mas_yr gives the full tangential velocity vector on the sky | -1.88 | 0.2% |
-| `e_RAICRS` | float64 |  | 1.32 | 0.2% |
-| `e_DEICRS` | float64 |  | 0.74 | 0.2% |
 | `parallax_error_mas` | float64 | 1-sigma formal uncertainty on the parallax in milliarcseconds; stars where parallax_error_mas > 0.5 × parallax_mas have uncertain distances (signal-to-noise < 2); use with caution for distance-dependent analyses | 1.39 | 0.2% |
-| `e_pmRA` | float64 |  | 1.36 | 0.2% |
-| `e_pmDE` | float64 |  | 0.81 | 0.2% |
-| `DE:RA` | float64 |  | 0.32 | 0.2% |
-| `Plx:RA` | float64 |  | -0.07 | 0.2% |
-| `Plx:DE` | float64 |  | -0.11 | 0.2% |
-| `pmRA:RA` | float64 |  | -0.24 | 0.2% |
-| `pmRA:DE` | float64 |  | 0.09 | 0.2% |
-| `pmRA:Plx` | float64 |  | -0.01 | 0.2% |
-| `pmDE:RA` | float64 |  | 0.1 | 0.2% |
-| `pmDE:DE` | float64 |  | -0.01 | 0.2% |
-| `pmDE:Plx` | float64 |  | 0.01 | 0.2% |
-| `pmDE:pmRA` | float64 |  | 0.34 | 0.2% |
-| `F1` | float64 |  | 0.0 | 0.2% |
-| `F2` | float64 |  | 0.74 | 1.5% |
-| `BTmag` | float64 |  | 9.643 | 2.9% |
-| `e_BTmag` | float64 |  | 0.02 | 2.9% |
-| `VTmag` | float64 |  | 9.13 | 2.8% |
-| `e_VTmag` | float64 |  | 0.019 | 2.8% |
-| `m_BTmag` | object |  |   | 0.0% |
 | `color_bv` | float64 | Johnson B−V color index in magnitudes; more positive values indicate redder, cooler stars (e.g. B−V ≈ −0.3 for hot O/B stars, +1.5 for cool M giants); null for stars lacking B-band photometry | 0.482 | 1.1% |
-| `e_B-V` | float64 |  | 0.025 | 1.1% |
-| `r_B-V` | object |  | T | 0.0% |
-| `V-I` | float64 |  | 0.55 | 1.1% |
-| `e_V-I` | float64 |  | 0.03 | 1.1% |
-| `r_V-I` | object |  | L | 0.0% |
-| `CombMag` | object |  |   | 0.0% |
-| `Hpmag` | float64 |  | 9.2043 | 0.0% |
-| `e_Hpmag` | float64 |  | 0.002 | 0.0% |
-| `Hpscat` | float64 |  | 0.017 | 0.8% |
-| `o_Hpmag` | float64 |  | 87.0 | 0.8% |
-| `m_Hpmag` | object |  |   | 0.0% |
-| `Hpmax` | float64 |  | 9.17 | 0.8% |
-| `HPmin` | float64 |  | 9.24 | 0.8% |
-| `HvarType` | object |  |   | 0.0% |
-| `moreVar` | object |  |   | 0.0% |
-| `morePhoto` | object |  |   | 0.0% |
-| `CCDM` | object |  |            | 0.0% |
-| `n_CCDM` | object |  |   | 0.0% |
-| `Nsys` | float64 |  | 1.0 | 83.6% |
-| `Ncomp` | float64 |  | 1.0 | 0.2% |
-| `MultFlag` | object |  |   | 0.0% |
-| `Source` | object |  |   | 0.0% |
-| `Qual` | object |  |   | 0.0% |
-| `m_HIP` | object |  |    | 0.0% |
-| `theta` | float64 |  | 316.0 | 90.6% |
-| `rho` | float64 |  | 0.463 | 90.6% |
-| `e_rho` | float64 |  | 0.002 | 90.6% |
-| `dHp` | float64 |  | 0.66 | 90.6% |
-| `e_dHp` | float64 |  | 0.01 | 90.6% |
-| `Survey` | object |  | S | 0.0% |
-| `Chart` | object |  |   | 0.0% |
-| `Notes` | object |  |   | 0.0% |
-| `HD` | float64 |  | 224700.0 | 16.4% |
-| `BD` | object |  | B+00 5077  | 0.0% |
-| `CoD` | object |  |            | 0.0% |
-| `CPD` | object |  |            | 0.0% |
-| `(V-I)red` | float64 |  | 0.66 | 0.0% |
 | `spectral_type` | object | MK (Morgan–Keenan) spectral classification from catalog cross-references, e.g. 'G2V' (Sun-like), 'K0III' (red giant); encodes temperature class (O B A F G K M), luminosity class (I–V), and sometimes peculiarity flags; null for ~30% of stars, especially fainter objects | F5 | 2.6% |
-| `r_SpType` | object |  | S | 0.0% |
-| `_RA_icrs` | float64 |  | 0.00089921 | 0.2% |
-| `_DE_icrs` | float64 |  | 1.08900875 | 0.2% |
 | `distance_pc` | float64 | Heliocentric distance in parsecs, derived as 1000 / parallax_mas; null when parallax_mas ≤ 0 (unphysical noise-dominated measurements); treat values with large parallax_error_mas as highly uncertain | 282.4858757062147 | 3.8% |
 
 ## Quick stats

data/hipparcos.parquet

@@ -1,3 +1,3 @@
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