메타데이터
| 항목 |
값 |
| Designation |
C/2002 A2 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2001-12-05T15:58:53.768640Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:12Z |
| Obs used |
204 |
| NEO |
- |
| M1 |
7.500 |
| K1 |
12.000 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2002-04-19.0000000 |
| e |
0.72650481 |
| q (au) |
4.707082 |
| a (au) |
17.210839 |
| i (deg) |
14.054928 |
| Ω (om, deg) |
81.928817 |
| ω (w, deg) |
19.264638 |
| M (ma, deg) |
1.854331 |
밝기
산란 + 전체 선형
$$
M_a = (6.536 + 5.031\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
6.536 |
| n |
5.031 |
| gf |
1.000 |
| gb |
-0.931 |
| 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) |
| 2026-09-20 00:00 |
17:50:48.95 |
-25:41:07.5 |
HIP 87422 |
15.79 |
| 2026-09-20 12:00 |
17:50:49.48 |
-25:41:06.7 |
HIP 87422 |
15.68 |
| 2026-09-21 00:00 |
17:50:50.05 |
-25:41:05.9 |
HIP 87422 |
15.56 |
| 2026-09-21 12:00 |
17:50:50.66 |
-25:41:05.1 |
HIP 87422 |
15.44 |
| 2026-09-22 00:00 |
17:50:51.31 |
-25:41:04.3 |
HIP 87422 |
15.30 |
| 2026-09-22 12:00 |
17:50:52.01 |
-25:41:03.6 |
HIP 87422 |
15.16 |
| 2026-09-23 00:00 |
17:50:52.75 |
-25:41:02.8 |
HIP 87422 |
15.01 |
| 2026-09-23 12:00 |
17:50:53.53 |
-25:41:02.1 |
HIP 87422 |
14.85 |
| 2026-09-24 00:00 |
17:50:54.35 |
-25:41:01.3 |
HIP 87422 |
14.68 |
| 2026-09-24 12:00 |
17:50:55.21 |
-25:41:00.6 |
HIP 87422 |
14.51 |
| 2026-09-25 00:00 |
17:50:56.12 |
-25:41:00.0 |
HIP 87422 |
14.32 |
| 2026-09-25 12:00 |
17:50:57.06 |
-25:40:59.2 |
HIP 87422 |
14.13 |
| 2026-09-26 00:00 |
17:50:58.05 |
-25:40:58.5 |
HIP 87422 |
13.93 |
| 2026-09-26 12:00 |
17:50:59.08 |
-25:40:57.8 |
HIP 87422 |
13.72 |
| 2026-09-27 00:00 |
17:51:00.15 |
-25:40:57.2 |
HIP 87422 |
13.50 |
| 2026-09-27 12:00 |
17:51:01.27 |
-25:40:56.5 |
HIP 87422 |
13.28 |
| 2026-09-28 00:00 |
17:51:02.42 |
-25:40:55.9 |
HIP 87422 |
13.04 |
| 2026-09-28 12:00 |
17:51:03.62 |
-25:40:55.2 |
HIP 87422 |
12.80 |
| 2026-09-29 00:00 |
17:51:04.86 |
-25:40:54.6 |
HIP 87422 |
12.56 |
| 2026-09-29 12:00 |
17:51:06.14 |
-25:40:54.0 |
HIP 87422 |
12.30 |
| 2026-09-30 00:00 |
17:51:07.46 |
-25:40:53.4 |
HIP 87422 |
12.04 |
| 2026-09-30 12:00 |
17:51:08.82 |
-25:40:52.8 |
HIP 87422 |
11.77 |
| 2026-10-01 00:00 |
17:51:10.22 |
-25:40:52.3 |
HIP 87422 |
11.50 |
| 2026-10-01 12:00 |
17:51:11.66 |
-25:40:51.7 |
HIP 87422 |
11.22 |
| 2026-10-02 00:00 |
17:51:13.15 |
-25:40:51.1 |
HIP 87422 |
10.94 |
| 2026-10-02 12:00 |
17:51:14.67 |
-25:40:50.6 |
HIP 87422 |
10.65 |
| 2026-10-03 00:00 |
17:51:16.24 |
-25:40:50.1 |
HIP 87422 |
10.35 |
| 2026-10-03 12:00 |
17:51:17.85 |
-25:40:49.6 |
HIP 87422 |
10.05 |
| 2026-10-04 00:00 |
17:51:19.49 |
-25:40:49.1 |
HIP 87422 |
9.75 |
| 2026-10-04 12:00 |
17:51:21.18 |
-25:40:48.6 |
HIP 87422 |
9.44 |
| 2026-10-05 00:00 |
17:51:22.91 |
-25:40:48.1 |
HIP 87422 |
9.14 |
| 2026-10-05 12:00 |
17:51:24.68 |
-25:40:47.6 |
HIP 87422 |
8.83 |
| 2026-10-06 00:00 |
17:51:26.49 |
-25:40:47.2 |
HIP 87422 |
8.52 |
| 2026-10-06 12:00 |
17:51:28.34 |
-25:40:46.8 |
HIP 87422 |
8.22 |
| 2026-10-07 00:00 |
17:51:30.23 |
-25:40:46.3 |
HIP 87422 |
7.92 |
| 2026-10-07 12:00 |
17:51:32.16 |
-25:40:45.9 |
HIP 87422 |
7.62 |
| 2026-10-08 00:00 |
17:51:34.13 |
-25:40:45.5 |
HIP 87422 |
7.33 |
| 2026-10-08 12:00 |
17:51:36.14 |
-25:40:45.1 |
HIP 87422 |
7.06 |
| 2026-10-09 00:00 |
17:51:38.19 |
-25:40:44.8 |
HIP 87422 |
6.79 |
| 2026-10-09 12:00 |
17:51:40.28 |
-25:40:44.4 |
HIP 87422 |
6.55 |
| 2026-10-10 00:00 |
17:51:42.41 |
-25:40:44.1 |
HIP 87422 |
6.32 |
| 2026-10-10 12:00 |
17:51:44.58 |
-25:40:43.7 |
HIP 87422 |
6.12 |
| 2026-10-11 00:00 |
17:51:46.78 |
-25:40:43.4 |
HIP 87422 |
5.95 |