V1668 Cygni was a nova that appeared in the northern constellation of Cygnus, situated a couple of degrees to the southeast of the star Rho Cygni. It was discovered by Canadian variable star observer Warren Morrison on September 10, 1978, and reached a peak brightness of around 6.22 apparent magnitude on September 12. The luminosity of the source at this time was about 100,000 times the brightness of the Sun, and likely remained at that level for several months. The expansion velocity of the nova shell was deduced through spectroscopy to be 1,300 km/s.
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| - V1668 Cygni (de)
- V1668 Cygni (es)
- V1668 Cygni (fr)
- V1668 Cygni (en)
- V1668 Cygni (sv)
- 天鹅座V1668 (zh)
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| - V1668 Cygni war eine Nova, die 1978 im Sternbild Schwan aufleuchtete und eine Helligkeit von 6 mag erreichte. (de)
- V1668 Cygni es el nombre que los astrónomos le dieron a la nova aparecida en la constelación de Cygnus en el año 1978. La nova alcanzó un brillo máximo de magnitud 6. (es)
- V1668 Cygni (ou Nova Cygni 1978) était une nova qui survint en 1978 dans la constellation du Cygne. Elle atteignit une magnitude minimale (correspondant à une luminosité maximale) de 6. (fr)
- V1668 Cygni var en nova som uppträdde i stjärnbilden Svanen i september 1978. Den maximala magnituden blev +6. (sv)
- 天鹅座V1668（V1668 Cygni）是一颗位于天鹅座的新星，1978年爆发。爆发时最亮视星等为6等。 (zh)
- V1668 Cygni was a nova that appeared in the northern constellation of Cygnus, situated a couple of degrees to the southeast of the star Rho Cygni. It was discovered by Canadian variable star observer Warren Morrison on September 10, 1978, and reached a peak brightness of around 6.22 apparent magnitude on September 12. The luminosity of the source at this time was about 100,000 times the brightness of the Sun, and likely remained at that level for several months. The expansion velocity of the nova shell was deduced through spectroscopy to be 1,300 km/s. (en)
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| - V1668 Cygni war eine Nova, die 1978 im Sternbild Schwan aufleuchtete und eine Helligkeit von 6 mag erreichte. (de)
- V1668 Cygni es el nombre que los astrónomos le dieron a la nova aparecida en la constelación de Cygnus en el año 1978. La nova alcanzó un brillo máximo de magnitud 6. (es)
- V1668 Cygni (ou Nova Cygni 1978) était une nova qui survint en 1978 dans la constellation du Cygne. Elle atteignit une magnitude minimale (correspondant à une luminosité maximale) de 6. (fr)
- V1668 Cygni was a nova that appeared in the northern constellation of Cygnus, situated a couple of degrees to the southeast of the star Rho Cygni. It was discovered by Canadian variable star observer Warren Morrison on September 10, 1978, and reached a peak brightness of around 6.22 apparent magnitude on September 12. The luminosity of the source at this time was about 100,000 times the brightness of the Sun, and likely remained at that level for several months. The expansion velocity of the nova shell was deduced through spectroscopy to be 1,300 km/s. After peak brightness, the lightcurve showed a smooth power-law decline with no major fluctuations. The decline in brightness was rapid, dropping by three magnitudes in 24 days. An optically thin shell of dust was created by the outburst that reached peak opacity after 50–60 days. The lack of a silicate feature in the infrared spectrum of this shell suggests the dust grains consisted of graphite, possibly condensed on atoms of cohenite. A 1994 analysis of the light curve showed the mass of the white dwarf source is about equal to the Sun. Warren Morrison was awarded the 1979 Ken Chilton prize of the RASC primarily for this discovery. (en)
- V1668 Cygni var en nova som uppträdde i stjärnbilden Svanen i september 1978. Den maximala magnituden blev +6. (sv)
- 天鹅座V1668（V1668 Cygni）是一颗位于天鹅座的新星，1978年爆发。爆发时最亮视星等为6等。 (zh)
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