메타데이터
| 항목 |
값 |
| Designation |
C/1998 M1 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1998-10-28T02:41:20.860800Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:53Z |
| Obs used |
191 |
| NEO |
- |
| M1 |
6.500 |
| K1 |
14.000 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
1998-09-21.0000000 |
| e |
0.99276578 |
| q (au) |
3.118124 |
| a (au) |
431.024098 |
| i (deg) |
20.384564 |
| Ω (om, deg) |
256.067464 |
| ω (w, deg) |
19.403420 |
| M (ma, deg) |
359.995912 |
밝기
산란 + 전체 선형
$$
M_a = (5.198 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
5.198 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.501 |
| 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
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
04:24:29.83 |
+24:48:23.2 |
HIP 20491 |
27.60 |
| 2026-07-29 12:00 |
04:24:31.33 |
+24:48:27.5 |
HIP 20491 |
27.83 |
| 2026-07-30 00:00 |
04:24:32.82 |
+24:48:31.9 |
HIP 20491 |
28.06 |
| 2026-07-30 12:00 |
04:24:34.29 |
+24:48:36.2 |
HIP 20491 |
28.29 |
| 2026-07-31 00:00 |
04:24:35.74 |
+24:48:40.5 |
HIP 20491 |
28.52 |
| 2026-07-31 12:00 |
04:24:37.17 |
+24:48:44.7 |
HIP 20491 |
28.75 |
| 2026-08-01 00:00 |
04:24:38.58 |
+24:48:49.0 |
HIP 20491 |
28.98 |
| 2026-08-01 12:00 |
04:24:39.98 |
+24:48:53.1 |
HIP 20491 |
29.21 |
| 2026-08-02 00:00 |
04:24:41.35 |
+24:48:57.3 |
HIP 20491 |
29.44 |
| 2026-08-02 12:00 |
04:24:42.71 |
+24:49:01.4 |
HIP 20491 |
29.67 |
| 2026-08-03 00:00 |
04:24:44.04 |
+24:49:05.5 |
HIP 20491 |
29.89 |
| 2026-08-03 12:00 |
04:24:45.36 |
+24:49:09.5 |
HIP 20491 |
30.12 |
| 2026-08-04 00:00 |
04:24:46.66 |
+24:49:13.5 |
HIP 20491 |
30.34 |
| 2026-08-04 12:00 |
04:24:47.94 |
+24:49:17.5 |
HIP 20491 |
30.56 |
| 2026-08-05 00:00 |
04:24:49.20 |
+24:49:21.4 |
HIP 20491 |
30.78 |
| 2026-08-05 12:00 |
04:24:50.44 |
+24:49:25.3 |
HIP 20491 |
31.00 |
| 2026-08-06 00:00 |
04:24:51.66 |
+24:49:29.2 |
HIP 20491 |
31.21 |
| 2026-08-06 12:00 |
04:24:52.86 |
+24:49:33.0 |
HIP 20491 |
31.43 |
| 2026-08-07 00:00 |
04:24:54.04 |
+24:49:36.8 |
HIP 20491 |
31.64 |
| 2026-08-07 12:00 |
04:24:55.20 |
+24:49:40.5 |
HIP 20491 |
31.85 |
| 2026-08-08 00:00 |
04:24:56.34 |
+24:49:44.3 |
HIP 20491 |
32.05 |
| 2026-08-08 12:00 |
04:24:57.46 |
+24:49:47.9 |
HIP 20491 |
32.26 |
| 2026-08-09 00:00 |
04:24:58.55 |
+24:49:51.6 |
HIP 20491 |
32.46 |
| 2026-08-09 12:00 |
04:24:59.63 |
+24:49:55.2 |
HIP 20491 |
32.66 |
| 2026-08-10 00:00 |
04:25:00.69 |
+24:49:58.7 |
HIP 20491 |
32.86 |
| 2026-08-10 12:00 |
04:25:01.73 |
+24:50:02.2 |
HIP 20491 |
33.05 |
| 2026-08-11 00:00 |
04:25:02.75 |
+24:50:05.7 |
HIP 20491 |
33.24 |
| 2026-08-11 12:00 |
04:25:03.74 |
+24:50:09.2 |
HIP 20491 |
33.43 |
| 2026-08-12 00:00 |
04:25:04.72 |
+24:50:12.5 |
HIP 20491 |
33.61 |
| 2026-08-12 12:00 |
04:25:05.67 |
+24:50:15.9 |
HIP 20491 |
33.79 |
| 2026-08-13 00:00 |
04:25:06.60 |
+24:50:19.2 |
HIP 20491 |
33.97 |
| 2026-08-13 12:00 |
04:25:07.52 |
+24:50:22.5 |
HIP 20491 |
34.15 |
| 2026-08-14 00:00 |
04:25:08.41 |
+24:50:25.7 |
HIP 20491 |
34.32 |
| 2026-08-14 12:00 |
04:25:09.28 |
+24:50:28.9 |
HIP 20604 |
34.45 |
| 2026-08-15 00:00 |
04:25:10.13 |
+24:50:32.1 |
HIP 20604 |
34.43 |
| 2026-08-15 12:00 |
04:25:10.95 |
+24:50:35.2 |
HIP 20604 |
34.41 |
| 2026-08-16 00:00 |
04:25:11.76 |
+24:50:38.2 |
HIP 20604 |
34.39 |
| 2026-08-16 12:00 |
04:25:12.54 |
+24:50:41.3 |
HIP 20604 |
34.37 |
| 2026-08-17 00:00 |
04:25:13.30 |
+24:50:44.2 |
HIP 20604 |
34.35 |
| 2026-08-17 12:00 |
04:25:14.04 |
+24:50:47.2 |
HIP 20812 |
34.26 |
| 2026-08-18 00:00 |
04:25:14.76 |
+24:50:50.1 |
HIP 20812 |
34.09 |
| 2026-08-18 12:00 |
04:25:15.46 |
+24:50:52.9 |
HIP 20812 |
33.93 |
| 2026-08-19 00:00 |
04:25:16.14 |
+24:50:55.7 |
HIP 20812 |
33.77 |