C/2025 K4 (Siverd)
메타데이터
| 항목 |
값 |
| Designation |
C/2025 K4 (Siverd) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2025-07-28T06:25:56.997120Z |
| Orbit solution date (soln_date, UTC) |
2025-12-12T11:12:30Z |
| Obs used |
29 |
| NEO |
- |
| M1 |
13.800 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2025-05-30T22:52:21.100800Z |
| Discovery magnitude (MPC) |
19.15 o |
| Discovery observatory (MPC) |
M22 · ATLAS South Africa, Sutherland |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2025-06-16.0000000 |
| e |
0.94157044 |
| q (au) |
2.532201 |
| a (au) |
43.337668 |
| i (deg) |
38.543416 |
| Ω (om, deg) |
297.083175 |
| ω (w, deg) |
326.935879 |
| M (ma, deg) |
359.853978 |
밝기
산란 + 전체 선형
$$
M_a = (10.661 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
10.661 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.502 |
| k |
1.000 |
| 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
찾아보기
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
20:55:23.70 |
-06:38:54.4 |
HIP 103154 |
25.65 |
| 2026-02-03 12:00 |
20:56:03.48 |
-06:32:50.8 |
HIP 103406 |
15.31 |
| 2026-02-04 00:00 |
20:56:43.18 |
-06:26:46.8 |
HIP 103406 |
4.96 |
| 2026-02-04 12:00 |
20:57:22.80 |
-06:20:42.6 |
HIP 103406 |
9.09 |
| 2026-02-05 00:00 |
20:58:02.33 |
-06:14:38.0 |
HIP 103495 |
4.21 |
| 2026-02-05 12:00 |
20:58:41.79 |
-06:08:33.0 |
HIP 103495 |
9.20 |
| 2026-02-06 00:00 |
20:59:21.15 |
-06:02:27.8 |
HIP 103495 |
20.43 |
| 2026-02-06 12:00 |
21:00:00.44 |
-05:56:22.2 |
HIP 103681 |
28.87 |
| 2026-02-07 00:00 |
21:00:39.64 |
-05:50:16.3 |
HIP 103681 |
21.70 |
| 2026-02-07 12:00 |
21:01:18.76 |
-05:44:10.1 |
HIP 103681 |
19.31 |
| 2026-02-08 00:00 |
21:01:57.80 |
-05:38:03.6 |
HIP 103681 |
23.19 |
| 2026-02-08 12:00 |
21:02:36.74 |
-05:31:56.8 |
HIP 103928 |
15.39 |
| 2026-02-09 00:00 |
21:03:15.61 |
-05:25:49.6 |
HIP 103928 |
4.16 |
| 2026-02-09 12:00 |
21:03:54.39 |
-05:19:42.1 |
HIP 103928 |
7.70 |
| 2026-02-10 00:00 |
21:04:33.08 |
-05:13:34.3 |
HIP 103928 |
19.03 |
| 2026-02-10 12:00 |
21:05:11.69 |
-05:07:26.2 |
HIP 104045 |
19.00 |
| 2026-02-11 00:00 |
21:05:50.21 |
-05:01:17.8 |
HIP 104045 |
20.11 |
| 2026-02-11 12:00 |
21:06:28.65 |
-04:55:09.0 |
HIP 104045 |
26.57 |
| 2026-02-12 00:00 |
21:07:07.00 |
-04:49:00.0 |
HIP 104433 |
33.70 |
| 2026-02-12 12:00 |
21:07:45.26 |
-04:42:50.6 |
HIP 104383 |
22.86 |
| 2026-02-13 00:00 |
21:08:23.43 |
-04:36:41.0 |
HIP 104383 |
12.36 |
| 2026-02-13 12:00 |
21:09:01.52 |
-04:30:31.0 |
HIP 104383 |
6.32 |
| 2026-02-14 00:00 |
21:09:39.51 |
-04:24:20.7 |
HIP 104383 |
13.52 |
| 2026-02-14 12:00 |
21:10:17.42 |
-04:18:10.1 |
HIP 104595 |
17.63 |
| 2026-02-15 00:00 |
21:10:55.24 |
-04:11:59.2 |
HIP 104595 |
6.36 |
| 2026-02-15 12:00 |
21:11:32.97 |
-04:05:48.0 |
HIP 104595 |
4.90 |
| 2026-02-16 00:00 |
21:12:10.61 |
-03:59:36.6 |
HIP 104595 |
16.14 |
| 2026-02-16 12:00 |
21:12:48.16 |
-03:53:24.8 |
HIP 104743 |
23.47 |
| 2026-02-17 00:00 |
21:13:25.61 |
-03:47:12.7 |
HIP 104743 |
28.95 |
| 2026-02-17 12:00 |
21:14:02.98 |
-03:41:00.3 |
HIP 104743 |
37.09 |
| 2026-02-18 00:00 |
21:14:40.25 |
-03:34:47.7 |
HIP 104743 |
46.52 |
| 2026-02-18 12:00 |
21:15:17.43 |
-03:28:34.7 |
HIP 104813 |
47.05 |
| 2026-02-19 00:00 |
21:15:54.52 |
-03:22:21.5 |
HIP 105183 |
42.30 |
| 2026-02-19 12:00 |
21:16:31.52 |
-03:16:08.0 |
HIP 105203 |
32.45 |
| 2026-02-20 00:00 |
21:17:08.42 |
-03:09:54.2 |
HIP 105203 |
22.28 |
| 2026-02-20 12:00 |
21:17:45.22 |
-03:03:40.2 |
HIP 105203 |
13.69 |
| 2026-02-21 00:00 |
21:18:21.93 |
-02:57:25.8 |
HIP 105203 |
11.19 |
| 2026-02-21 12:00 |
21:18:58.55 |
-02:51:11.2 |
HIP 105302 |
11.02 |
| 2026-02-22 00:00 |
21:19:35.07 |
-02:44:56.4 |
HIP 105302 |
7.97 |
| 2026-02-22 12:00 |
21:20:11.50 |
-02:38:41.2 |
HIP 105302 |
15.81 |
| 2026-02-23 00:00 |
21:20:47.82 |
-02:32:25.8 |
HIP 105302 |
26.06 |
| 2026-02-23 12:00 |
21:21:24.06 |
-02:26:10.2 |
HIP 105359 |
26.78 |
| 2026-02-24 00:00 |
21:22:00.19 |
-02:19:54.3 |
HIP 105359 |
28.60 |