메타데이터
| 항목 |
값 |
| Designation |
C/2025 K2 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2025-10-25T07:48:17.305920Z |
| Orbit solution date (soln_date, UTC) |
2025-08-12T09:42:16Z |
| Obs used |
26 |
| NEO |
- |
| M1 |
7.400 |
| K1 |
21.250 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2025-05-29T12:48:33.840000Z |
| Discovery magnitude (MPC) |
20.47 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2025-06-09.0000000 |
| e |
0.88709889 |
| q (au) |
2.863643 |
| a (au) |
25.364173 |
| i (deg) |
113.978010 |
| Ω (om, deg) |
113.828014 |
| ω (w, deg) |
232.466816 |
| M (ma, deg) |
358.932730 |
밝기
산란 + 전체 선형
$$
M_a = (16.125 + 4.640\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
16.125 |
| n |
4.640 |
| gf |
1.000 |
| gb |
-0.976 |
| k |
0.800 |
| δ90 |
10.000 |
| 파라미터 |
기호 |
범위 |
설명 |
| 태양·지구거리 1 AU에서의 절대등급 |
H0 |
-5 to 20 |
혜성의 고유 밝기 |
| 광도 기울기 파라미터 |
n |
2 to 6 |
태양거리 변화에 따른 밝기 변화율 |
| 전방 산란 비대칭 계수 |
gf |
0.8 to 1 |
전방 산란의 강도 |
| 후방 산란 비대칭 계수 |
gb |
-1 to -0.5 |
후방 산란의 강도 |
| 분할 계수 |
k |
0.8 to 1 |
전·후방 산란 기여도 비율 |
| 먼지/가스 밝기 비 |
δ90 |
1 to 10 |
코마에서 먼지 산란 대비 가스 방출의 상대 기여 |
참고: EPSC-DPS2025-160
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
07:02:32.75 |
-72:48:34.3 |
HIP 33788 |
16.53 |
| 2026-03-26 12:00 |
07:02:34.14 |
-72:31:30.2 |
HIP 33788 |
7.57 |
| 2026-03-27 00:00 |
07:02:36.57 |
-72:14:25.6 |
HIP 34035 |
15.22 |
| 2026-03-27 12:00 |
07:02:39.99 |
-71:57:20.6 |
HIP 34035 |
5.21 |
| 2026-03-28 00:00 |
07:02:44.35 |
-71:40:15.3 |
HIP 33766 |
18.97 |
| 2026-03-28 12:00 |
07:02:49.62 |
-71:23:09.7 |
HIP 33766 |
9.92 |
| 2026-03-29 00:00 |
07:02:55.74 |
-71:06:04.0 |
HIP 34212 |
16.60 |
| 2026-03-29 12:00 |
07:03:02.69 |
-70:48:58.3 |
HIP 33860 |
16.27 |
| 2026-03-30 00:00 |
07:03:10.43 |
-70:31:52.5 |
HIP 33990 |
0.62 |
| 2026-03-30 12:00 |
07:03:18.92 |
-70:14:47.0 |
HIP 33990 |
17.73 |
| 2026-03-31 00:00 |
07:03:28.13 |
-69:57:41.6 |
HIP 33680 |
20.90 |
| 2026-03-31 12:00 |
07:03:38.04 |
-69:40:36.5 |
HIP 33680 |
21.34 |
| 2026-04-01 00:00 |
07:03:48.61 |
-69:23:31.8 |
HIP 33680 |
32.59 |
| 2026-04-01 12:00 |
07:03:59.82 |
-69:06:27.5 |
HIP 34270 |
20.20 |
| 2026-04-02 00:00 |
07:04:11.64 |
-68:49:23.8 |
HIP 34270 |
11.11 |
| 2026-04-02 12:00 |
07:04:24.05 |
-68:32:20.8 |
HIP 34126 |
17.46 |
| 2026-04-03 00:00 |
07:04:37.03 |
-68:15:18.5 |
HIP 34126 |
0.43 |
| 2026-04-03 12:00 |
07:04:50.55 |
-67:58:16.9 |
HIP 34386 |
16.68 |
| 2026-04-04 00:00 |
07:05:04.59 |
-67:41:16.3 |
HIP 34386 |
21.41 |
| 2026-04-04 12:00 |
07:05:19.14 |
-67:24:16.6 |
HIP 34308 |
24.82 |
| 2026-04-05 00:00 |
07:05:34.17 |
-67:07:17.9 |
HIP 34308 |
9.54 |
| 2026-04-05 12:00 |
07:05:49.68 |
-66:50:20.4 |
HIP 34308 |
12.04 |
| 2026-04-06 00:00 |
07:06:05.63 |
-66:33:24.1 |
HIP 33993 |
26.34 |
| 2026-04-06 12:00 |
07:06:22.01 |
-66:16:29.1 |
HIP 34679 |
27.56 |
| 2026-04-07 00:00 |
07:06:38.82 |
-65:59:35.4 |
HIP 34679 |
32.61 |
| 2026-04-07 12:00 |
07:06:56.03 |
-65:42:43.2 |
HIP 33895 |
31.08 |
| 2026-04-08 00:00 |
07:07:13.63 |
-65:25:52.5 |
HIP 33895 |
32.65 |
| 2026-04-08 12:00 |
07:07:31.61 |
-65:09:03.4 |
HIP 34901 |
39.98 |
| 2026-04-09 00:00 |
07:07:49.95 |
-64:52:16.0 |
HIP 34827 |
32.24 |
| 2026-04-09 12:00 |
07:08:08.65 |
-64:35:30.3 |
HIP 34092 |
26.50 |
| 2026-04-10 00:00 |
07:08:27.68 |
-64:18:46.5 |
HIP 34256 |
20.94 |
| 2026-04-10 12:00 |
07:08:47.05 |
-64:02:04.6 |
HIP 34365 |
10.04 |
| 2026-04-11 00:00 |
07:09:06.73 |
-63:45:24.7 |
HIP 34509 |
0.60 |
| 2026-04-11 12:00 |
07:09:26.72 |
-63:28:46.8 |
HIP 34509 |
17.12 |
| 2026-04-12 00:00 |
07:09:47.01 |
-63:12:11.1 |
HIP 34780 |
15.24 |
| 2026-04-12 12:00 |
07:10:07.59 |
-62:55:37.6 |
HIP 34808 |
17.74 |
| 2026-04-13 00:00 |
07:10:28.45 |
-62:39:06.3 |
HIP 34571 |
21.61 |
| 2026-04-13 12:00 |
07:10:49.58 |
-62:22:37.5 |
HIP 34571 |
9.41 |
| 2026-04-14 00:00 |
07:11:10.97 |
-62:06:11.0 |
HIP 34571 |
16.30 |
| 2026-04-14 12:00 |
07:11:32.61 |
-61:49:47.1 |
HIP 34717 |
1.44 |
| 2026-04-15 00:00 |
07:11:54.51 |
-61:33:25.7 |
HIP 34877 |
8.25 |
| 2026-04-15 12:00 |
07:12:16.64 |
-61:17:07.0 |
HIP 34826 |
5.97 |
| 2026-04-16 00:00 |
07:12:39.00 |
-61:00:50.9 |
HIP 34850 |
2.90 |