메타데이터
| 항목 |
값 |
| Designation |
C/1967 Y1 (Ikeya-Seki) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1968-02-25T16:56:06.803520Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:17Z |
| Obs used |
197 |
| NEO |
- |
| M1 |
6.400 |
| K1 |
4.500 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
1968-03-18.0000000 |
| e |
0.99915636 |
| q (au) |
1.696579 |
| a (au) |
2011.021687 |
| i (deg) |
129.315339 |
| Ω (om, deg) |
255.321380 |
| ω (w, deg) |
70.864407 |
| M (ma, deg) |
0.000233 |
밝기
산란 + 전체 선형
$$
M_a = (2.937 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
2.937 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.991 |
| 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) |
| 2026-06-01 00:00 |
03:00:57.72 |
-23:29:59.8 |
HIP 13955 |
18.52 |
| 2026-06-01 12:00 |
03:00:59.06 |
-23:30:01.3 |
HIP 13955 |
18.81 |
| 2026-06-02 00:00 |
03:01:00.40 |
-23:30:02.9 |
HIP 13955 |
19.10 |
| 2026-06-02 12:00 |
03:01:01.73 |
-23:30:04.6 |
HIP 13955 |
19.40 |
| 2026-06-03 00:00 |
03:01:03.06 |
-23:30:06.4 |
HIP 13955 |
19.69 |
| 2026-06-03 12:00 |
03:01:04.38 |
-23:30:08.3 |
HIP 14146 |
19.57 |
| 2026-06-04 00:00 |
03:01:05.70 |
-23:30:10.4 |
HIP 14146 |
19.28 |
| 2026-06-04 12:00 |
03:01:07.01 |
-23:30:12.6 |
HIP 14146 |
18.99 |
| 2026-06-05 00:00 |
03:01:08.32 |
-23:30:14.9 |
HIP 14146 |
18.70 |
| 2026-06-05 12:00 |
03:01:09.62 |
-23:30:17.3 |
HIP 14146 |
18.41 |
| 2026-06-06 00:00 |
03:01:10.91 |
-23:30:19.9 |
HIP 14146 |
18.12 |
| 2026-06-06 12:00 |
03:01:12.20 |
-23:30:22.5 |
HIP 14146 |
17.83 |
| 2026-06-07 00:00 |
03:01:13.49 |
-23:30:25.3 |
HIP 14146 |
17.54 |
| 2026-06-07 12:00 |
03:01:14.77 |
-23:30:28.2 |
HIP 14146 |
17.25 |
| 2026-06-08 00:00 |
03:01:16.04 |
-23:30:31.2 |
HIP 14146 |
16.96 |
| 2026-06-08 12:00 |
03:01:17.31 |
-23:30:34.4 |
HIP 14146 |
16.68 |
| 2026-06-09 00:00 |
03:01:18.57 |
-23:30:37.6 |
HIP 14146 |
16.39 |
| 2026-06-09 12:00 |
03:01:19.82 |
-23:30:41.0 |
HIP 14146 |
16.11 |
| 2026-06-10 00:00 |
03:01:21.07 |
-23:30:44.5 |
HIP 14146 |
15.82 |
| 2026-06-10 12:00 |
03:01:22.32 |
-23:30:48.1 |
HIP 14146 |
15.54 |
| 2026-06-11 00:00 |
03:01:23.55 |
-23:30:51.9 |
HIP 14146 |
15.26 |
| 2026-06-11 12:00 |
03:01:24.78 |
-23:30:55.7 |
HIP 14146 |
14.97 |
| 2026-06-12 00:00 |
03:01:26.01 |
-23:30:59.7 |
HIP 14146 |
14.69 |
| 2026-06-12 12:00 |
03:01:27.23 |
-23:31:03.8 |
HIP 14146 |
14.41 |
| 2026-06-13 00:00 |
03:01:28.44 |
-23:31:08.0 |
HIP 14146 |
14.13 |
| 2026-06-13 12:00 |
03:01:29.64 |
-23:31:12.4 |
HIP 14146 |
13.85 |
| 2026-06-14 00:00 |
03:01:30.84 |
-23:31:16.8 |
HIP 14146 |
13.58 |
| 2026-06-14 12:00 |
03:01:32.03 |
-23:31:21.4 |
HIP 14146 |
13.30 |
| 2026-06-15 00:00 |
03:01:33.21 |
-23:31:26.1 |
HIP 14146 |
13.02 |
| 2026-06-15 12:00 |
03:01:34.38 |
-23:31:30.9 |
HIP 14146 |
12.75 |
| 2026-06-16 00:00 |
03:01:35.55 |
-23:31:35.8 |
HIP 14146 |
12.47 |
| 2026-06-16 12:00 |
03:01:36.71 |
-23:31:40.8 |
HIP 14146 |
12.20 |
| 2026-06-17 00:00 |
03:01:37.87 |
-23:31:46.0 |
HIP 14146 |
11.92 |
| 2026-06-17 12:00 |
03:01:39.01 |
-23:31:51.3 |
HIP 14146 |
11.65 |
| 2026-06-18 00:00 |
03:01:40.15 |
-23:31:56.7 |
HIP 14146 |
11.38 |
| 2026-06-18 12:00 |
03:01:41.28 |
-23:32:02.2 |
HIP 14146 |
11.11 |
| 2026-06-19 00:00 |
03:01:42.40 |
-23:32:07.8 |
HIP 14146 |
10.84 |
| 2026-06-19 12:00 |
03:01:43.52 |
-23:32:13.5 |
HIP 14146 |
10.57 |
| 2026-06-20 00:00 |
03:01:44.62 |
-23:32:19.3 |
HIP 14146 |
10.30 |
| 2026-06-20 12:00 |
03:01:45.72 |
-23:32:25.3 |
HIP 14146 |
10.03 |
| 2026-06-21 00:00 |
03:01:46.81 |
-23:32:31.4 |
HIP 14146 |
9.77 |
| 2026-06-21 12:00 |
03:01:47.90 |
-23:32:37.5 |
HIP 14146 |
9.50 |
| 2026-06-22 00:00 |
03:01:48.97 |
-23:32:43.8 |
HIP 14146 |
9.24 |