C/1998 M4 (LINEAR)
메타데이터
| 항목 |
값 |
| Designation |
C/1998 M4 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1997-12-10T02:48:12.064320Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:53Z |
| Obs used |
116 |
| NEO |
- |
| M1 |
9.500 |
| K1 |
10.000 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
1998-07-03.0000000 |
| e |
0.99738677 |
| q (au) |
2.600017 |
| a (au) |
994.943592 |
| i (deg) |
154.571097 |
| Ω (om, deg) |
92.922669 |
| ω (w, deg) |
106.286301 |
| M (ma, deg) |
0.006434 |
밝기
산란 + 전체 선형
$$
M_a = (11.003 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
11.003 |
| n |
2.000 |
| gf |
0.812 |
| gb |
-0.935 |
| k |
1.000 |
| δ90 |
2.331 |
| 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) |
| 2026-02-03 00:00 |
12:12:07.40 |
-29:01:22.9 |
HIP 59460 |
22.91 |
| 2026-02-03 12:00 |
12:12:05.61 |
-29:01:26.9 |
HIP 59460 |
22.77 |
| 2026-02-04 00:00 |
12:12:03.80 |
-29:01:30.8 |
HIP 59460 |
22.64 |
| 2026-02-04 12:00 |
12:12:01.97 |
-29:01:34.4 |
HIP 59460 |
22.52 |
| 2026-02-05 00:00 |
12:12:00.12 |
-29:01:37.9 |
HIP 59460 |
22.40 |
| 2026-02-05 12:00 |
12:11:58.26 |
-29:01:41.2 |
HIP 59460 |
22.30 |
| 2026-02-06 00:00 |
12:11:56.38 |
-29:01:44.3 |
HIP 59460 |
22.21 |
| 2026-02-06 12:00 |
12:11:54.49 |
-29:01:47.2 |
HIP 59460 |
22.12 |
| 2026-02-07 00:00 |
12:11:52.58 |
-29:01:49.9 |
HIP 59460 |
22.05 |
| 2026-02-07 12:00 |
12:11:50.65 |
-29:01:52.5 |
HIP 59460 |
21.99 |
| 2026-02-08 00:00 |
12:11:48.71 |
-29:01:54.8 |
HIP 59460 |
21.93 |
| 2026-02-08 12:00 |
12:11:46.75 |
-29:01:57.0 |
HIP 59460 |
21.89 |
| 2026-02-09 00:00 |
12:11:44.77 |
-29:01:59.0 |
HIP 59460 |
21.86 |
| 2026-02-09 12:00 |
12:11:42.78 |
-29:02:00.8 |
HIP 59460 |
21.85 |
| 2026-02-10 00:00 |
12:11:40.77 |
-29:02:02.4 |
HIP 59460 |
21.84 |
| 2026-02-10 12:00 |
12:11:38.74 |
-29:02:03.8 |
HIP 59460 |
21.85 |
| 2026-02-11 00:00 |
12:11:36.70 |
-29:02:05.0 |
HIP 59460 |
21.87 |
| 2026-02-11 12:00 |
12:11:34.65 |
-29:02:06.1 |
HIP 59460 |
21.90 |
| 2026-02-12 00:00 |
12:11:32.58 |
-29:02:06.9 |
HIP 59460 |
21.94 |
| 2026-02-12 12:00 |
12:11:30.50 |
-29:02:07.6 |
HIP 59460 |
22.00 |
| 2026-02-13 00:00 |
12:11:28.40 |
-29:02:08.0 |
HIP 59460 |
22.07 |
| 2026-02-13 12:00 |
12:11:26.28 |
-29:02:08.3 |
HIP 59460 |
22.15 |
| 2026-02-14 00:00 |
12:11:24.15 |
-29:02:08.4 |
HIP 59460 |
22.25 |
| 2026-02-14 12:00 |
12:11:22.01 |
-29:02:08.3 |
HIP 59460 |
22.36 |
| 2026-02-15 00:00 |
12:11:19.85 |
-29:02:08.0 |
HIP 59460 |
22.48 |
| 2026-02-15 12:00 |
12:11:17.68 |
-29:02:07.5 |
HIP 59460 |
22.62 |
| 2026-02-16 00:00 |
12:11:15.49 |
-29:02:06.9 |
HIP 59460 |
22.77 |
| 2026-02-16 12:00 |
12:11:13.29 |
-29:02:06.0 |
HIP 59460 |
22.93 |
| 2026-02-17 00:00 |
12:11:11.08 |
-29:02:05.0 |
HIP 59460 |
23.10 |
| 2026-02-17 12:00 |
12:11:08.86 |
-29:02:03.7 |
HIP 59460 |
23.29 |
| 2026-02-18 00:00 |
12:11:06.62 |
-29:02:02.3 |
HIP 59460 |
23.49 |
| 2026-02-18 12:00 |
12:11:04.36 |
-29:02:00.7 |
HIP 59460 |
23.70 |
| 2026-02-19 00:00 |
12:11:02.10 |
-29:01:58.8 |
HIP 59460 |
23.93 |
| 2026-02-19 12:00 |
12:10:59.82 |
-29:01:56.8 |
HIP 59460 |
24.16 |
| 2026-02-20 00:00 |
12:10:57.53 |
-29:01:54.6 |
HIP 59460 |
24.41 |
| 2026-02-20 12:00 |
12:10:55.23 |
-29:01:52.3 |
HIP 59337 |
24.57 |
| 2026-02-21 00:00 |
12:10:52.92 |
-29:01:49.7 |
HIP 59337 |
24.46 |
| 2026-02-21 12:00 |
12:10:50.59 |
-29:01:46.9 |
HIP 59337 |
24.35 |
| 2026-02-22 00:00 |
12:10:48.25 |
-29:01:44.0 |
HIP 59337 |
24.26 |
| 2026-02-22 12:00 |
12:10:45.90 |
-29:01:40.8 |
HIP 59337 |
24.19 |
| 2026-02-23 00:00 |
12:10:43.54 |
-29:01:37.5 |
HIP 59337 |
24.12 |
| 2026-02-23 12:00 |
12:10:41.17 |
-29:01:33.9 |
HIP 59337 |
24.08 |
| 2026-02-24 00:00 |
12:10:38.79 |
-29:01:30.2 |
HIP 59337 |
24.04 |