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V1494 Aquilae eller Nova Aquilae 1999b var … V1494 Aquilae eller Nova Aquilae 1999b var en nova i stjärnbilden Örnen. Novan upptäcktes av nova- och kometjägaren Alfredo Pereira (Portugal) den 1 december 1999. Novan var då magnitud +6,0 och på väg att bli ljusstarkare. Vid maximum nådde den +4,0 och var alltså väl synlig för blotta ögat.och var alltså väl synlig för blotta ögat.
, V1494 Aquilae (ou Nova Aquilae 1999) était … V1494 Aquilae (ou Nova Aquilae 1999) était une nova qui fut détectée pour la première fois le 1er décembre 1999 par Alfredo Pereira (Cabo da Roca, Portugal) dans la constellation de l'Aigle, à une distance d'environ 5 degrés de l'étoile delta Aquilae. Elle atteignit une magnitude minimale (correspondant à une luminosité maximale) de 3,6 mag, soit une augmentation de luminosité de 70 000 fois.augmentation de luminosité de 70 000 fois.
, V1494 Aquilae es el nombre que los astrónomos le dieron a la nova aparecida en la constelación de Aquila en 1999. La nova alcanzó un brillo de magnitud 8,8.
, V1494 Aquilae war eine Nova, die 1999 im S … V1494 Aquilae war eine Nova, die 1999 im Sternbild Adler aufleuchtete und eine Helligkeit von 5,03 mag erreichte. Sie wurde am 1. Dezember 1999 von dem Amateurastronomen Alfredo Pereira aus (Portugal) entdeckt. Der Namensteil „V1494“ folgt den Regeln zur Benennung veränderlicher Sterne und besagt, dass V1494 Aquilae der 1494te veränderliche Stern ist, der im Sternbild Adler (lateinisch Aquila) entdeckt wurde. Adler (lateinisch Aquila) entdeckt wurde.
, V1494 Aquilae or Nova Aquilae 1999 b was a … V1494 Aquilae or Nova Aquilae 1999 b was a nova which occurred during 1999 in the constellation Aquila and reached a brightness of magnitude 3.9 on 2 December 1999. making it easily visible to the naked eye. The nova was discovered with 14×100 binoculars by Alfredo Pereira of Cabo da Roca, Portugal at 18:50 UT on 1 December 1999, when it had a visual magnitude of 6.0. V1494 Aquilae is classified as a fast nova, meaning it faded from peak brightness by more than 3 magnitudes in less than 100 days. During its decline, V1494 Aql produced unusual variations in its x-ray radiation, including a bright burst lasting several minutes. During 2000, the x-ray spectrum developed from a hard (high energy) emission-line spectrum to a spectrum typical of a super soft X-ray source. The x-ray intensity varied with a period of about 40 minutes, probably due to pulsations induced in the white dwarf by its re-kindled hydrogen fusion. All novae are binary systems with two stars orbiting so close to each other that one star, the "donor" star transfers matter to the other star which is a white dwarf. In the case of V1494 the white dwarf has a mass of 1.20M☉, and it is accreting mass from the donor star at a rate of 2.1 × 10−10 M☉ yr−1. The stars' orbital period is 3.23 hours, and the system is an eclipsing binary with two brightness minima each orbit, one 0.5 and one 0.1 magnitudes deep. This apparently is a measurement of two stars of approximately equal brightness, the nova and a companion 1.4″ to the south east. Measuring only the brightness of the nova, the eclipses are about two magnitudes deep. The white dwarf is probably an oxygen-neon-magnesium type. Unlike some novae, the material ejected from V1494 Aquilae has not formed a visible nebula around the star. However, a shell approximately 6.5″ across has been detected spectroscopically in H-alpha emission. The distance to V1494 Aquilae has been estimated by different methods. Early estimates were based on assumptions about the luminosity of the nova and gave distances around 1.2 kpc. Later models assumed distances of up to 2.2 kpc. Comparison of the measured shell size with the observed expansion velocity give a distance of 1.2±0.2 kpc. Gaia DR2 published a parallax of 0.8394±0.1415 mas, corresponding to a distance of 1,239+422−127 kpc. Gaia EDR3 published a parallax of 0.5615±0.1281 mas, corresponding to a distance around 1,800 kpc.responding to a distance around 1,800 kpc.
, 天鹰座V1494（V1494 Aquilae）也被称为1999年天鹰座新星b（NOVA Aquilae 1999 b）是一颗位于天鹰座的新星，1999年爆发。爆发时最亮视星等为4.0。
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V1494 Aquilae or Nova Aquilae 1999 b was a … V1494 Aquilae or Nova Aquilae 1999 b was a nova which occurred during 1999 in the constellation Aquila and reached a brightness of magnitude 3.9 on 2 December 1999. making it easily visible to the naked eye. The nova was discovered with 14×100 binoculars by Alfredo Pereira of Cabo da Roca, Portugal at 18:50 UT on 1 December 1999, when it had a visual magnitude of 6.0. Unlike some novae, the material ejected from V1494 Aquilae has not formed a visible nebula around the star. However, a shell approximately 6.5″ across has been detected spectroscopically in H-alpha emission.ted spectroscopically in H-alpha emission.
, V1494 Aquilae es el nombre que los astrónomos le dieron a la nova aparecida en la constelación de Aquila en 1999. La nova alcanzó un brillo de magnitud 8,8.
, 天鹰座V1494（V1494 Aquilae）也被称为1999年天鹰座新星b（NOVA Aquilae 1999 b）是一颗位于天鹰座的新星，1999年爆发。爆发时最亮视星等为4.0。
, V1494 Aquilae eller Nova Aquilae 1999b var … V1494 Aquilae eller Nova Aquilae 1999b var en nova i stjärnbilden Örnen. Novan upptäcktes av nova- och kometjägaren Alfredo Pereira (Portugal) den 1 december 1999. Novan var då magnitud +6,0 och på väg att bli ljusstarkare. Vid maximum nådde den +4,0 och var alltså väl synlig för blotta ögat.och var alltså väl synlig för blotta ögat.
, V1494 Aquilae (ou Nova Aquilae 1999) était … V1494 Aquilae (ou Nova Aquilae 1999) était une nova qui fut détectée pour la première fois le 1er décembre 1999 par Alfredo Pereira (Cabo da Roca, Portugal) dans la constellation de l'Aigle, à une distance d'environ 5 degrés de l'étoile delta Aquilae. Elle atteignit une magnitude minimale (correspondant à une luminosité maximale) de 3,6 mag, soit une augmentation de luminosité de 70 000 fois.augmentation de luminosité de 70 000 fois.
, V1494 Aquilae war eine Nova, die 1999 im S … V1494 Aquilae war eine Nova, die 1999 im Sternbild Adler aufleuchtete und eine Helligkeit von 5,03 mag erreichte. Sie wurde am 1. Dezember 1999 von dem Amateurastronomen Alfredo Pereira aus (Portugal) entdeckt. Der Namensteil „V1494“ folgt den Regeln zur Benennung veränderlicher Sterne und besagt, dass V1494 Aquilae der 1494te veränderliche Stern ist, der im Sternbild Adler (lateinisch Aquila) entdeckt wurde. Adler (lateinisch Aquila) entdeckt wurde.
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V1494 Aquilae
, 天鹰座V1494
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