Image: Composite wide-field view showing the locations of V462 Lupi (left) and V572 Velorum (right). Credit: Sky & Telescope / José Francisco Salgado

In June 2025, two classical novae erupted almost simultaneously in the Southern Hemisphere, reaching naked-eye visibility within weeks of each other. V462 Lupi lit up the constellation Lupus on June 12, and V572 Velorum followed suit in Vela on June 25. Such a dual display hasn’t been recorded since 1936, offering skywatchers a once-in-a-lifetime celestial spectacle.

How They Were Discovered

Astronomers first spotted V462 Lupi on June 12 using all-sky surveys including the ASAS-SN network. Over the next two weeks, amateur observers and professional telescopes confirmed its peak brightness around magnitude +5.5. Shortly thereafter, on June 25, V572 Velorum was detected by the All-Sky Automated Survey for SuperNovae in Chile and quickly verified by follow-up spectroscopy. Both novae are thermonuclear explosions on the surfaces of white dwarfs in binary systems, triggered by material accretion from a companion star.

Brightness, Location & Where to Look

At peak, each nova shone at roughly magnitude +5.5—just on the threshold of naked-eye visibility under dark skies. V462 Lupi sat low in Lupus, about 10° above the southern horizon at local midnight for southern-hemisphere observers. V572 Velorum appeared higher in Vela, easily seen through binoculars from mid-latitudes. Both novae have since faded to around magnitude +7–8 but remain visible with small telescopes.

Image: Star chart marking the positions of V462 Lupi (red circle) and V572 Velorum (blue circle) in the southern sky. Credit: Sky & Telescope

Why It’s So Rare

Classical novae occur roughly 30–60 times per year in the Milky Way, but two reaching naked-eye brightness within weeks is extraordinary. The last similar event took place in 1936, when CP Pup and QZ Aur were both visible without aid. This dual nova event provides a unique opportunity to compare eruption physics under nearly identical conditions, offering fresh insights into white-dwarf binary evolution.

Looking Ahead

Both novae will continue fading over the coming months. Amateur astronomers can track their light curves using binoculars and small telescopes, contributing valuable data to citizen-science surveys. Meanwhile, professional observatories will analyze their spectra to study ejected material composition—shedding light on how these stellar explosions enrich the galaxy with heavy elements.

Sources

• Sky & Telescope: “Twin Naked-Eye Novae Light Up Southern Skies”
• Space.com: “Nova V462 Lupi Erupts to Naked-Eye Brightness”
• Sky & Telescope: “Where and How to See the 2025 Novae”