Theta Cancri

θ Cancri
Observation data Epoch J2000.0 Equinox J2000.0
Constellation	Cancer
Right ascension	08^h31^m35.7^s
Declination	+18°05′40″
Apparent magnitude (V)	+5.33
Distance	494 ± 69 ly (152 ± 21 pc)
Spectral type	K5III
Other designations
31 Cancri, HR 3357, HD 72094, BD+18°1963, FK5 2667, HIP 41822, SAO 97881, GC 11659, BDS 4655, CCDM 08316+1806

Theta Cancri (θ Cnc, θ Cancri) is a binary star in the constellation Cancer, 494 light years from Earth.

θ Cancri is classified as an orange K-type giant with an apparent magnitude of +5.33. Since it is near the ecliptic, it can be occulted by the Moon and, very rarely, by planets. From studying its light curve during occultation, θ Cancri is shown to be a close binary, consisting of two stars each with an apparent magnitude of +6.4.

Cancer constellation

Stars (list)

Bayer	α (Acubens) β (Tarf) γ (Asellus Borealis) δ (Asellus Australis) ε ζ (Tegmine) η θ ι κ λ μ¹ μ² ν ξ ο¹ ο² π¹ π² ρ¹ (Copernicus) ρ² σ¹ σ² σ³ τ υ¹ υ² φ¹ φ² χ ψ¹ ψ² ω¹

Flamsteed	1 3 4 (ω²) 5 7 8 11 12 15 20 21 24 25 27 28 29 34 35 36 37 38 39 40 42 44 45 46 49 50 52 53 54 55 (ρ¹) 57 60 61 66 67 68 70 71 75 78 79 80 83 1 LMi 2 LMi 3 LMi 4 LMi

Variable	R S T U V X RS RU RX RZ SS SY TT TU TW TX UU VZ WY YZ AC AD AH AK AR AT AZ BN BQ BR BS BU BW BX CC CU CY DW DX EG EP ES EV EW EX FZ GY HU HV

HR	3104 3115 3125 3127 3158 3164 3198 3201 3222 3228 3231 3252 3264 3306 3376 3380 3394 3395 3424 3428 3504 3558 3567 3599 3606 3617 3620 3635 3657 3689 3707

HD	67542 69629 72115 73534 74721 76908 79498

Other	ADS 7284 G 9-38 HAT-P-31 LHS 2090 PSR B0823+26 RX J0806.3+1527 YBP 1194

Star clusters

Open	Beehive Cluster Messier 67 NGC 2664 NGC 2678

Nebulae

Planetary	Abell 30

Galaxies

NGC	2503 2507 2512 2513 2514 2522 2526 2530 2535 2536 2540 2545 2553 2554 2556 2557 2558 2560 2562 2563 2565 2569 2570 2572 2575 2576 2577 2581 2582 2592 2593 2594 2595 2596 2598 2599 2604 2604B 2607 2608 2611 2619 2620 2621 2622 2623 2624 2625 2628 2647 2648 2651 2657 2661 2667 2672 2673 2677 2679 2680 2711 2720 2725 2728 2730 2731 2734 2735 2735A 2737 2738 2741 2743 2744 2744A 2745 2747 2749 2750 2751 2752 2753 2761 2764 2766 2773 2774 2775 2777 2783 2783B 2786 2789 2790 2791 2794 2795 2796 2797 2801 2802 2803 2804 2807 2807A 2809 2812 2813 2819 2824 2843

Other	B2 0827+243 3C 190 3C 191 3C 192 3C 207 3C 212 3C 215 4C +29.30 Mrk 704 OI 090.4 OJ 287 QSO B0820+225 QSO B0839+187

Galaxy
clusters

Other

GRB 021211
SN 1999aa
SN 2002lt

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