メタデータ
| 項目 |
値 |
| Designation |
C/1966 R1 (Ikeya-Everhart) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1966-08-05T07:42:01.379520Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:17Z |
| Obs used |
23 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1966-09-23.0000000 |
| e |
1.00004638 |
| q (au) |
0.881833 |
| a (au) |
-19014.652685 |
| i (deg) |
48.278876 |
| Ω (om, deg) |
107.658924 |
| ω (w, deg) |
50.044476 |
| M (ma, deg) |
0.000018 |
等級
散乱 + 全体線形
$$
M_a = (6.490 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
6.490 |
| n |
6.000 |
| gf |
0.999 |
| gb |
-1.000 |
| k |
0.982 |
| δ90 |
10.000 |
| パラメータ |
記号 |
範囲 |
説明 |
| 太陽・地球距離が1 AUのときの絶対等級 |
H0 |
-5 to 20 |
彗星の固有の明るさ |
| 測光スロープパラメータ |
n |
2 to 6 |
太陽距離に対する明るさ変化率 |
| 前方散乱非対称係数 |
gf |
0.8 to 1 |
前方散乱の強さ |
| 後方散乱非対称係数 |
gb |
-1 to -0.5 |
後方散乱の強さ |
| 分配係数 |
k |
0.8 to 1 |
前方/後方散乱の寄与比 |
| ダスト/ガス明るさ比 |
δ90 |
1 to 10 |
ダスト散乱とガス放射の相対寄与 |
参考: EPSC-DPS2025-160
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
21:57:45.59 |
-42:06:01.1 |
HIP 108479 |
24.22 |
| 2026-06-01 12:00 |
21:57:45.23 |
-42:06:12.5 |
HIP 108479 |
24.42 |
| 2026-06-02 00:00 |
21:57:44.86 |
-42:06:24.0 |
HIP 108479 |
24.63 |
| 2026-06-02 12:00 |
21:57:44.47 |
-42:06:35.5 |
HIP 108479 |
24.83 |
| 2026-06-03 00:00 |
21:57:44.07 |
-42:06:47.0 |
HIP 108479 |
25.04 |
| 2026-06-03 12:00 |
21:57:43.66 |
-42:06:58.5 |
HIP 108479 |
25.24 |
| 2026-06-04 00:00 |
21:57:43.23 |
-42:07:10.1 |
HIP 108479 |
25.45 |
| 2026-06-04 12:00 |
21:57:42.79 |
-42:07:21.7 |
HIP 108479 |
25.66 |
| 2026-06-05 00:00 |
21:57:42.33 |
-42:07:33.3 |
HIP 108479 |
25.87 |
| 2026-06-05 12:00 |
21:57:41.86 |
-42:07:45.0 |
HIP 108479 |
26.09 |
| 2026-06-06 00:00 |
21:57:41.37 |
-42:07:56.7 |
HIP 108479 |
26.30 |
| 2026-06-06 12:00 |
21:57:40.87 |
-42:08:08.4 |
HIP 108479 |
26.51 |
| 2026-06-07 00:00 |
21:57:40.36 |
-42:08:20.1 |
HIP 108479 |
26.73 |
| 2026-06-07 12:00 |
21:57:39.83 |
-42:08:31.9 |
HIP 108479 |
26.95 |
| 2026-06-08 00:00 |
21:57:39.29 |
-42:08:43.6 |
HIP 108479 |
27.17 |
| 2026-06-08 12:00 |
21:57:38.73 |
-42:08:55.4 |
HIP 108479 |
27.39 |
| 2026-06-09 00:00 |
21:57:38.16 |
-42:09:07.3 |
HIP 108479 |
27.61 |
| 2026-06-09 12:00 |
21:57:37.57 |
-42:09:19.1 |
HIP 108479 |
27.83 |
| 2026-06-10 00:00 |
21:57:36.98 |
-42:09:30.9 |
HIP 108479 |
28.06 |
| 2026-06-10 12:00 |
21:57:36.36 |
-42:09:42.8 |
HIP 108479 |
28.28 |
| 2026-06-11 00:00 |
21:57:35.74 |
-42:09:54.7 |
HIP 108479 |
28.51 |
| 2026-06-11 12:00 |
21:57:35.10 |
-42:10:06.6 |
HIP 108479 |
28.74 |
| 2026-06-12 00:00 |
21:57:34.44 |
-42:10:18.5 |
HIP 108479 |
28.96 |
| 2026-06-12 12:00 |
21:57:33.77 |
-42:10:30.5 |
HIP 108479 |
29.20 |
| 2026-06-13 00:00 |
21:57:33.09 |
-42:10:42.4 |
HIP 108479 |
29.43 |
| 2026-06-13 12:00 |
21:57:32.40 |
-42:10:54.4 |
HIP 108479 |
29.66 |
| 2026-06-14 00:00 |
21:57:31.69 |
-42:11:06.4 |
HIP 108479 |
29.89 |
| 2026-06-14 12:00 |
21:57:30.97 |
-42:11:18.4 |
HIP 108479 |
30.13 |
| 2026-06-15 00:00 |
21:57:30.23 |
-42:11:30.4 |
HIP 108479 |
30.36 |
| 2026-06-15 12:00 |
21:57:29.48 |
-42:11:42.4 |
HIP 108479 |
30.60 |
| 2026-06-16 00:00 |
21:57:28.72 |
-42:11:54.4 |
HIP 108479 |
30.84 |
| 2026-06-16 12:00 |
21:57:27.94 |
-42:12:06.4 |
HIP 108479 |
31.08 |
| 2026-06-17 00:00 |
21:57:27.15 |
-42:12:18.5 |
HIP 108479 |
31.32 |
| 2026-06-17 12:00 |
21:57:26.35 |
-42:12:30.5 |
HIP 108479 |
31.56 |
| 2026-06-18 00:00 |
21:57:25.53 |
-42:12:42.5 |
HIP 108479 |
31.80 |
| 2026-06-18 12:00 |
21:57:24.71 |
-42:12:54.6 |
HIP 108479 |
32.05 |
| 2026-06-19 00:00 |
21:57:23.86 |
-42:13:06.6 |
HIP 108479 |
32.29 |
| 2026-06-19 12:00 |
21:57:23.01 |
-42:13:18.7 |
HIP 108479 |
32.54 |
| 2026-06-20 00:00 |
21:57:22.14 |
-42:13:30.7 |
HIP 108479 |
32.79 |
| 2026-06-20 12:00 |
21:57:21.26 |
-42:13:42.8 |
HIP 108479 |
33.04 |
| 2026-06-21 00:00 |
21:57:20.37 |
-42:13:54.8 |
HIP 108479 |
33.28 |
| 2026-06-21 12:00 |
21:57:19.46 |
-42:14:06.9 |
HIP 108479 |
33.53 |
| 2026-06-22 00:00 |
21:57:18.54 |
-42:14:18.9 |
HIP 108479 |
33.79 |