메타데이터
| 항목 |
값 |
| Designation |
C/1977 H1 (Helin) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1977-06-30T23:22:37.151040Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:27Z |
| Obs used |
35 |
| NEO |
- |
| M1 |
14.600 |
| K1 |
10.000 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
1977-04-22.0000000 |
| e |
0.99999249 |
| q (au) |
1.117547 |
| a (au) |
148777.258886 |
| i (deg) |
43.194938 |
| Ω (om, deg) |
20.138583 |
| ω (w, deg) |
249.358219 |
| M (ma, deg) |
359.999999 |
밝기
산란 + 전체 선형
$$
M_a = (12.630 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
12.630 |
| n |
6.000 |
| gf |
1.000 |
| 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) |
| 2026-09-20 00:00 |
03:45:27.84 |
+55:12:14.2 |
HIP 17575 |
9.01 |
| 2026-09-20 12:00 |
03:45:26.54 |
+55:12:24.5 |
HIP 17575 |
9.24 |
| 2026-09-21 00:00 |
03:45:25.23 |
+55:12:34.6 |
HIP 17575 |
9.46 |
| 2026-09-21 12:00 |
03:45:23.90 |
+55:12:44.7 |
HIP 17575 |
9.69 |
| 2026-09-22 00:00 |
03:45:22.54 |
+55:12:54.7 |
HIP 17575 |
9.92 |
| 2026-09-22 12:00 |
03:45:21.17 |
+55:13:04.6 |
HIP 17575 |
10.15 |
| 2026-09-23 00:00 |
03:45:19.77 |
+55:13:14.4 |
HIP 17575 |
10.39 |
| 2026-09-23 12:00 |
03:45:18.35 |
+55:13:24.1 |
HIP 17575 |
10.62 |
| 2026-09-24 00:00 |
03:45:16.92 |
+55:13:33.8 |
HIP 17575 |
10.85 |
| 2026-09-24 12:00 |
03:45:15.46 |
+55:13:43.3 |
HIP 17575 |
11.09 |
| 2026-09-25 00:00 |
03:45:13.99 |
+55:13:52.7 |
HIP 17575 |
11.32 |
| 2026-09-25 12:00 |
03:45:12.49 |
+55:14:02.1 |
HIP 17575 |
11.56 |
| 2026-09-26 00:00 |
03:45:10.98 |
+55:14:11.3 |
HIP 17575 |
11.80 |
| 2026-09-26 12:00 |
03:45:09.44 |
+55:14:20.4 |
HIP 17575 |
12.04 |
| 2026-09-27 00:00 |
03:45:07.88 |
+55:14:29.5 |
HIP 17575 |
12.28 |
| 2026-09-27 12:00 |
03:45:06.31 |
+55:14:38.4 |
HIP 17575 |
12.52 |
| 2026-09-28 00:00 |
03:45:04.72 |
+55:14:47.3 |
HIP 17575 |
12.76 |
| 2026-09-28 12:00 |
03:45:03.10 |
+55:14:56.0 |
HIP 17575 |
13.01 |
| 2026-09-29 00:00 |
03:45:01.47 |
+55:15:04.7 |
HIP 17575 |
13.25 |
| 2026-09-29 12:00 |
03:44:59.82 |
+55:15:13.2 |
HIP 17575 |
13.50 |
| 2026-09-30 00:00 |
03:44:58.15 |
+55:15:21.7 |
HIP 17575 |
13.75 |
| 2026-09-30 12:00 |
03:44:56.46 |
+55:15:30.0 |
HIP 17575 |
13.99 |
| 2026-10-01 00:00 |
03:44:54.75 |
+55:15:38.3 |
HIP 17575 |
14.24 |
| 2026-10-01 12:00 |
03:44:53.03 |
+55:15:46.4 |
HIP 17575 |
14.49 |
| 2026-10-02 00:00 |
03:44:51.28 |
+55:15:54.5 |
HIP 17575 |
14.75 |
| 2026-10-02 12:00 |
03:44:49.52 |
+55:16:02.4 |
HIP 17575 |
15.00 |
| 2026-10-03 00:00 |
03:44:47.74 |
+55:16:10.2 |
HIP 17575 |
15.25 |
| 2026-10-03 12:00 |
03:44:45.94 |
+55:16:17.9 |
HIP 17575 |
15.51 |
| 2026-10-04 00:00 |
03:44:44.12 |
+55:16:25.5 |
HIP 17575 |
15.77 |
| 2026-10-04 12:00 |
03:44:42.28 |
+55:16:33.0 |
HIP 17575 |
16.03 |
| 2026-10-05 00:00 |
03:44:40.43 |
+55:16:40.4 |
HIP 17575 |
16.28 |
| 2026-10-05 12:00 |
03:44:38.56 |
+55:16:47.7 |
HIP 17575 |
16.54 |
| 2026-10-06 00:00 |
03:44:36.67 |
+55:16:54.9 |
HIP 17575 |
16.81 |
| 2026-10-06 12:00 |
03:44:34.76 |
+55:17:02.0 |
HIP 17575 |
17.07 |
| 2026-10-07 00:00 |
03:44:32.83 |
+55:17:08.9 |
HIP 17575 |
17.33 |
| 2026-10-07 12:00 |
03:44:30.89 |
+55:17:15.7 |
HIP 17575 |
17.60 |
| 2026-10-08 00:00 |
03:44:28.93 |
+55:17:22.5 |
HIP 17575 |
17.87 |
| 2026-10-08 12:00 |
03:44:26.96 |
+55:17:29.1 |
HIP 17575 |
18.13 |
| 2026-10-09 00:00 |
03:44:24.97 |
+55:17:35.6 |
HIP 17575 |
18.40 |
| 2026-10-09 12:00 |
03:44:22.96 |
+55:17:42.0 |
HIP 17575 |
18.67 |
| 2026-10-10 00:00 |
03:44:20.93 |
+55:17:48.2 |
HIP 17575 |
18.94 |
| 2026-10-10 12:00 |
03:44:18.89 |
+55:17:54.4 |
HIP 17575 |
19.22 |
| 2026-10-11 00:00 |
03:44:16.83 |
+55:18:00.4 |
HIP 17575 |
19.49 |