메타데이터
| 항목 |
값 |
| Designation |
C/1989 A6 (Shoemaker) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1988-11-02T02:05:44.491200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:38Z |
| Obs used |
28 |
| NEO |
- |
| M1 |
13.300 |
| K1 |
4.500 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
1989-02-10.0000000 |
| e |
1.00000000 |
| q (au) |
2.207946 |
| a (au) |
- |
| i (deg) |
25.505596 |
| Ω (om, deg) |
74.314457 |
| ω (w, deg) |
18.838143 |
| M (ma, deg) |
- |
밝기
산란 + 전체 선형
$$
M_a = (11.985 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
11.985 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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 |
16:37:51.38 |
-20:46:46.0 |
HIP 81287 |
24.13 |
| 2026-07-29 12:00 |
16:37:50.28 |
-20:46:44.8 |
HIP 81287 |
23.87 |
| 2026-07-30 00:00 |
16:37:49.19 |
-20:46:43.7 |
HIP 81287 |
23.62 |
| 2026-07-30 12:00 |
16:37:48.12 |
-20:46:42.5 |
HIP 81287 |
23.37 |
| 2026-07-31 00:00 |
16:37:47.05 |
-20:46:41.4 |
HIP 81287 |
23.12 |
| 2026-07-31 12:00 |
16:37:46.01 |
-20:46:40.4 |
HIP 81287 |
22.88 |
| 2026-08-01 00:00 |
16:37:44.98 |
-20:46:39.3 |
HIP 81287 |
22.64 |
| 2026-08-01 12:00 |
16:37:43.96 |
-20:46:38.3 |
HIP 81287 |
22.40 |
| 2026-08-02 00:00 |
16:37:42.96 |
-20:46:37.3 |
HIP 81287 |
22.17 |
| 2026-08-02 12:00 |
16:37:41.97 |
-20:46:36.4 |
HIP 81287 |
21.94 |
| 2026-08-03 00:00 |
16:37:41.00 |
-20:46:35.5 |
HIP 81287 |
21.71 |
| 2026-08-03 12:00 |
16:37:40.05 |
-20:46:34.6 |
HIP 81287 |
21.49 |
| 2026-08-04 00:00 |
16:37:39.11 |
-20:46:33.8 |
HIP 81287 |
21.27 |
| 2026-08-04 12:00 |
16:37:38.18 |
-20:46:32.9 |
HIP 81287 |
21.05 |
| 2026-08-05 00:00 |
16:37:37.27 |
-20:46:32.2 |
HIP 81287 |
20.84 |
| 2026-08-05 12:00 |
16:37:36.37 |
-20:46:31.4 |
HIP 81287 |
20.63 |
| 2026-08-06 00:00 |
16:37:35.49 |
-20:46:30.7 |
HIP 81287 |
20.43 |
| 2026-08-06 12:00 |
16:37:34.63 |
-20:46:30.0 |
HIP 81287 |
20.23 |
| 2026-08-07 00:00 |
16:37:33.78 |
-20:46:29.4 |
HIP 81287 |
20.03 |
| 2026-08-07 12:00 |
16:37:32.95 |
-20:46:28.7 |
HIP 81287 |
19.84 |
| 2026-08-08 00:00 |
16:37:32.13 |
-20:46:28.2 |
HIP 81287 |
19.65 |
| 2026-08-08 12:00 |
16:37:31.33 |
-20:46:27.6 |
HIP 81287 |
19.46 |
| 2026-08-09 00:00 |
16:37:30.55 |
-20:46:27.1 |
HIP 81287 |
19.28 |
| 2026-08-09 12:00 |
16:37:29.78 |
-20:46:26.6 |
HIP 81287 |
19.10 |
| 2026-08-10 00:00 |
16:37:29.02 |
-20:46:26.2 |
HIP 81287 |
18.93 |
| 2026-08-10 12:00 |
16:37:28.29 |
-20:46:25.7 |
HIP 81287 |
18.75 |
| 2026-08-11 00:00 |
16:37:27.56 |
-20:46:25.4 |
HIP 81287 |
18.59 |
| 2026-08-11 12:00 |
16:37:26.86 |
-20:46:25.0 |
HIP 81287 |
18.42 |
| 2026-08-12 00:00 |
16:37:26.17 |
-20:46:24.7 |
HIP 81287 |
18.27 |
| 2026-08-12 12:00 |
16:37:25.50 |
-20:46:24.4 |
HIP 81287 |
18.11 |
| 2026-08-13 00:00 |
16:37:24.84 |
-20:46:24.2 |
HIP 81287 |
17.96 |
| 2026-08-13 12:00 |
16:37:24.20 |
-20:46:24.0 |
HIP 81287 |
17.81 |
| 2026-08-14 00:00 |
16:37:23.58 |
-20:46:23.8 |
HIP 81287 |
17.67 |
| 2026-08-14 12:00 |
16:37:22.98 |
-20:46:23.6 |
HIP 81287 |
17.53 |
| 2026-08-15 00:00 |
16:37:22.39 |
-20:46:23.5 |
HIP 81287 |
17.39 |
| 2026-08-15 12:00 |
16:37:21.81 |
-20:46:23.5 |
HIP 81287 |
17.26 |
| 2026-08-16 00:00 |
16:37:21.26 |
-20:46:23.4 |
HIP 81287 |
17.14 |
| 2026-08-16 12:00 |
16:37:20.72 |
-20:46:23.4 |
HIP 81287 |
17.01 |
| 2026-08-17 00:00 |
16:37:20.20 |
-20:46:23.4 |
HIP 81287 |
16.89 |
| 2026-08-17 12:00 |
16:37:19.69 |
-20:46:23.5 |
HIP 81287 |
16.78 |
| 2026-08-18 00:00 |
16:37:19.20 |
-20:46:23.6 |
HIP 81287 |
16.67 |
| 2026-08-18 12:00 |
16:37:18.73 |
-20:46:23.7 |
HIP 81287 |
16.56 |
| 2026-08-19 00:00 |
16:37:18.27 |
-20:46:23.9 |
HIP 81287 |
16.45 |