C/1984 W2 (Hartley)
메타데이터
| 항목 |
값 |
| Designation |
C/1984 W2 (Hartley) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1985-09-28T09:29:19.821120Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:31Z |
| Obs used |
53 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
1986-02-18.0000000 |
| e |
0.99947295 |
| q (au) |
4.000285 |
| a (au) |
7589.981412 |
| i (deg) |
89.326939 |
| Ω (om, deg) |
250.204076 |
| ω (w, deg) |
255.271872 |
| M (ma, deg) |
0.000213 |
밝기
산란 + 전체 선형
$$
M_a = (4.937 + 4.665\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
4.937 |
| n |
4.665 |
| gf |
0.993 |
| 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
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
17:05:58.66 |
+23:02:19.4 |
HIP 83669 |
17.04 |
| 2026-02-03 12:00 |
17:05:59.82 |
+23:02:36.7 |
HIP 83669 |
16.73 |
| 2026-02-04 00:00 |
17:06:00.98 |
+23:02:54.2 |
HIP 83669 |
16.43 |
| 2026-02-04 12:00 |
17:06:02.11 |
+23:03:11.7 |
HIP 83669 |
16.13 |
| 2026-02-05 00:00 |
17:06:03.24 |
+23:03:29.4 |
HIP 83669 |
15.83 |
| 2026-02-05 12:00 |
17:06:04.34 |
+23:03:47.2 |
HIP 83669 |
15.54 |
| 2026-02-06 00:00 |
17:06:05.44 |
+23:04:05.1 |
HIP 83669 |
15.25 |
| 2026-02-06 12:00 |
17:06:06.51 |
+23:04:23.0 |
HIP 83669 |
14.96 |
| 2026-02-07 00:00 |
17:06:07.57 |
+23:04:41.1 |
HIP 83669 |
14.67 |
| 2026-02-07 12:00 |
17:06:08.62 |
+23:04:59.3 |
HIP 83669 |
14.38 |
| 2026-02-08 00:00 |
17:06:09.65 |
+23:05:17.6 |
HIP 83669 |
14.10 |
| 2026-02-08 12:00 |
17:06:10.67 |
+23:05:36.1 |
HIP 83669 |
13.82 |
| 2026-02-09 00:00 |
17:06:11.67 |
+23:05:54.6 |
HIP 83669 |
13.55 |
| 2026-02-09 12:00 |
17:06:12.65 |
+23:06:13.2 |
HIP 83669 |
13.27 |
| 2026-02-10 00:00 |
17:06:13.62 |
+23:06:31.9 |
HIP 83669 |
13.00 |
| 2026-02-10 12:00 |
17:06:14.57 |
+23:06:50.7 |
HIP 83669 |
12.74 |
| 2026-02-11 00:00 |
17:06:15.51 |
+23:07:09.6 |
HIP 83669 |
12.48 |
| 2026-02-11 12:00 |
17:06:16.43 |
+23:07:28.6 |
HIP 83669 |
12.22 |
| 2026-02-12 00:00 |
17:06:17.33 |
+23:07:47.7 |
HIP 83669 |
11.96 |
| 2026-02-12 12:00 |
17:06:18.22 |
+23:08:06.9 |
HIP 83669 |
11.71 |
| 2026-02-13 00:00 |
17:06:19.09 |
+23:08:26.2 |
HIP 83669 |
11.47 |
| 2026-02-13 12:00 |
17:06:19.95 |
+23:08:45.6 |
HIP 83669 |
11.22 |
| 2026-02-14 00:00 |
17:06:20.79 |
+23:09:05.0 |
HIP 83669 |
10.99 |
| 2026-02-14 12:00 |
17:06:21.61 |
+23:09:24.6 |
HIP 83669 |
10.76 |
| 2026-02-15 00:00 |
17:06:22.42 |
+23:09:44.2 |
HIP 83669 |
10.53 |
| 2026-02-15 12:00 |
17:06:23.21 |
+23:10:03.9 |
HIP 83669 |
10.31 |
| 2026-02-16 00:00 |
17:06:23.98 |
+23:10:23.7 |
HIP 83669 |
10.10 |
| 2026-02-16 12:00 |
17:06:24.74 |
+23:10:43.6 |
HIP 83669 |
9.89 |
| 2026-02-17 00:00 |
17:06:25.48 |
+23:11:03.6 |
HIP 83669 |
9.69 |
| 2026-02-17 12:00 |
17:06:26.20 |
+23:11:23.6 |
HIP 83669 |
9.50 |
| 2026-02-18 00:00 |
17:06:26.90 |
+23:11:43.7 |
HIP 83669 |
9.31 |
| 2026-02-18 12:00 |
17:06:27.59 |
+23:12:03.9 |
HIP 83669 |
9.13 |
| 2026-02-19 00:00 |
17:06:28.26 |
+23:12:24.2 |
HIP 83669 |
8.96 |
| 2026-02-19 12:00 |
17:06:28.92 |
+23:12:44.5 |
HIP 83669 |
8.80 |
| 2026-02-20 00:00 |
17:06:29.55 |
+23:13:05.0 |
HIP 83669 |
8.65 |
| 2026-02-20 12:00 |
17:06:30.17 |
+23:13:25.4 |
HIP 83669 |
8.51 |
| 2026-02-21 00:00 |
17:06:30.78 |
+23:13:46.0 |
HIP 83669 |
8.38 |
| 2026-02-21 12:00 |
17:06:31.36 |
+23:14:06.6 |
HIP 83669 |
8.26 |
| 2026-02-22 00:00 |
17:06:31.93 |
+23:14:27.3 |
HIP 83669 |
8.15 |
| 2026-02-22 12:00 |
17:06:32.48 |
+23:14:48.0 |
HIP 83669 |
8.06 |
| 2026-02-23 00:00 |
17:06:33.01 |
+23:15:08.8 |
HIP 83669 |
7.97 |
| 2026-02-23 12:00 |
17:06:33.53 |
+23:15:29.7 |
HIP 83669 |
7.90 |
| 2026-02-24 00:00 |
17:06:34.03 |
+23:15:50.6 |
HIP 83669 |
7.84 |