R Aquarii
catalogues and names
catalogues and names | R Aqr, HR 8992, HD 222800, SAO 165849, BD -16 6352 |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
position (J2000) | RA: 23h 43min 49.5sec | DEC: -15° 17' 4'' | ||
position (2000.72) | RA: 23h 43min 52sec | DEC: -15° 16' 50'' | ||
position (B1900) | RA: 23h 38min 38.8sec | DEC: -15° 50' 19'' | ||
proper motion (J2000) | RA: 0.032 arcsec/a | DEC: -0.025 arcsec/a | ||
radial velocity | -22 km/s note: variable radial velocity |
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galactic coordinates | longitude: 66.52° | latitude: -70.32° |
magnitude
visual magnitude | 6.36 (V on UBV Johnson system) |
spectral / color information
spectral class | M7IIIpe |
B-V-magnitude | 1.58 |
U-B-magnitude | 0.32 |
IR-note | object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978) |
note (category: spectra): | Strong emission of He 10830 and FeXIII 10747. Spectrum varies M5e-M8.5e + pec. |
variability information
variable star identification | R Aqr |
note (category: variability): | M 5.8 - 12.4v, 386.96d. Secular period change, and oscillations in 24y period, also in RV. Variable radio emission and SiO maser. May be a symbiotic star embedded in expanding gaseous nebula. Dust cloud associated with red component. Companion B2ep may be an accretion white dwarf. Merrill in 1935 and Payne-Gaposhkin in 1946 analyzed the composite light curve of R Aqr and its companion, concluding that the companion varies from about 8 to 12p, perhaps by even 5m. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
position (J2000) | RA: 23h 43min 49.456sec | DEC: -15° 17' 4.24'' | ±0.19 arcsec | source: 16 |
position (2000.72) | RA: 23h 43min 51sec | DEC: -15° 16' 50'' | JD: 2451806.35 | |
proper motion (J2000) | RA: 0.0017 arcsec/a | DEC: -0.031 arcsec/a | source: 25 | |
radial velocity | -22 km/s | source: 25 | ||
galactic coord. (B1950) | longitude: 66.54° | latitude: -70.32° |
magnitude:
visual | 6.36 (observed) | source: 25 |
photovisual | 6.2 | source: 16 |
spectral information:
spectral class | M0 | source: 96 | |
Morgan-Keenan | M7IIIpe | source: 25 | |
B-magnitude | 7.94 ±0.05 | B-V-magnitude | 1.58 |
U-magnitude | 8.26 ±0.05 | U-B-magnitude | 0.32 |
variability information:
variability type | 180 |
var. amplitude | 6.6 |
var. period | 386.96 |
var. epoch | 2442398 16. December 1974, 12:00:00 UT |
next max light | 2452072 11. June 2001, 12:00:00 UT |
sources:
16 | PPM North and PPM South Catalogs and PPM Supplement |
Roser, S., and U. Bastian, "Catalogue of Positions and Proper Motions," A&AS, Vol. 74, p. 449, 1988, and Bastian, U., et al., "Catalogue of Positions and Proper Motions - South," 1993 | |
25 | Bright Star Catalogue, 5th edition |
Hoffleit, D. and Warren, W.H. Jr., The Bright Star Catalogue, 5th Revised Edition, Version 2, 1994 | |
30 | GCVS, 4th edition |
Kholopov, P.N., et al., General Catalogue of Variable Stars, fourth edition, Moscow: Nauka Publishing House, 1985-88 | |
96 | SAO or HD/HDE Catalog |
Reference from Value 1 or Reference from Value 2 |
data from Smithsonian Astrophysical Observatory Star Catalog (SAO Staff 1966; USNO, ADC 1990)
position and proper motion:
position (B1950) | RA: 23h 41min 14.186sec | DEC: -15° 33' 41.79'' | ±0.028 arcsec |
position (2000.72) | RA: 23h 43min 51sec | DEC: -15° 16' 49'' | JD: 2451806.35 |
position (J2000) | RA: 23h 43min 49.47sec | DEC: -15° 17' 3.56'' | |
proper motion B1950 (FK4) | RA: 0.002 arcsec/a | DEC: -0.021 arcsec/a | ±0.005 arcsec/a in RA ±0.005 arcsec/a in DEC |
proper motion J2000 (FK5) | RA: 0.0022 arcsec/a | DEC: -0.025 arcsec/a | |
source of proper motion data | Determined by source catalog |
magnitude:
visual | 5.8 (accuracy: 1 decimal) |
source of visual magnitude data | Source cited in source catalog introduction. |
spectral information:
spectral class | M6p |
source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
remarks for duplicity and variability
Variable star in visual magnitude in source catalog |
catalogues
source catalogue | GC, catalogue number: 32948 |
Durchmusterung | BD-16 6352 |
Boss General Catalogue | 32948 |
Henry Draper Catalogue | 222800 |
data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)
position:
position (equinox 1950.0) | RA: 23h 41min 14.2sec | DEC: -15° 33' 42'' |
variability informations:
variability type | M | pulsating variable star |
magnitute at max. brightness | 5.8 | |
magnitute at min. brightness | 12.4 | |
photometric system | visual, photovisual or Johnson's V | |
epoch for maximum light [JD] | 2442398 16. December 1974, 12:00:00 UT |
|
period [d] | 386.96 | |
next maximum light [JD] | 2452072 11. June 2001, 12:00:00 UT |
|
rising time | 42 % of period |
spectral information
spectral class | M5e-M8.5e+pec |
references
to a study | the main characteristics of the star was determined by the authors themselves |
to a chart/photograph | Vol. I GCVS (see Kholopov et al. 1985-1988) |
miscanellous
ID in the GCVS catalogue | 4/1 |
constellation | Aquarius |
notes on existence | The star is equivalent to '0040002 S'. |
There are notes in published catalog. |
variability type description
variability type | description |
M | Mira (Omicron) Ceti-type variables. These are long-period variable giants with characteristic late-type emission spectra (Me, Ce, Se) and light amplitudes from 2.5 to 11 mag in V. Their periodicity is well pronounced, and the periods lie in the range between 80 and 1000 days. Infrared amplitudes are usually less than in the visible and may be <2.5 mag. For example, in the K band they usually do not exceed 0.9 mag. If the amplitudes exceed 1 - 1.5 mag , but it is not certain that the true light amplitude exceeds 2.5 mag, the symbol "M" is followed by a colon, or the star is attributed to the semiregular class with a colon following the symbol for that type (SR). |