メタデータ
| 項目 |
値 |
| Designation |
C/1898 R1 (Perrine-Chofardet) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1898-10-21T00:56:12.053760Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:28:56Z |
| Obs used |
71 |
| NEO |
- |
| M1 |
7.500 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1898-09-21.0000000 |
| e |
1.00003407 |
| q (au) |
0.420481 |
| a (au) |
-12342.273054 |
| i (deg) |
28.858333 |
| Ω (om, deg) |
36.291475 |
| ω (w, deg) |
162.363692 |
| M (ma, deg) |
-0.000022 |
等級
散乱 + 全体線形
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| 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 |
01:14:22.29 |
-04:14:52.9 |
HIP 5845 |
29.61 |
| 2026-06-01 12:00 |
01:14:22.78 |
-04:14:51.8 |
HIP 5845 |
29.55 |
| 2026-06-02 00:00 |
01:14:23.27 |
-04:14:50.9 |
HIP 5845 |
29.50 |
| 2026-06-02 12:00 |
01:14:23.76 |
-04:14:49.9 |
HIP 5845 |
29.45 |
| 2026-06-03 00:00 |
01:14:24.24 |
-04:14:49.1 |
HIP 5845 |
29.39 |
| 2026-06-03 12:00 |
01:14:24.72 |
-04:14:48.2 |
HIP 5845 |
29.34 |
| 2026-06-04 00:00 |
01:14:25.19 |
-04:14:47.4 |
HIP 5845 |
29.30 |
| 2026-06-04 12:00 |
01:14:25.66 |
-04:14:46.7 |
HIP 5845 |
29.25 |
| 2026-06-05 00:00 |
01:14:26.12 |
-04:14:45.9 |
HIP 5845 |
29.20 |
| 2026-06-05 12:00 |
01:14:26.58 |
-04:14:45.3 |
HIP 5845 |
29.16 |
| 2026-06-06 00:00 |
01:14:27.03 |
-04:14:44.6 |
HIP 5845 |
29.12 |
| 2026-06-06 12:00 |
01:14:27.47 |
-04:14:44.1 |
HIP 5845 |
29.08 |
| 2026-06-07 00:00 |
01:14:27.91 |
-04:14:43.5 |
HIP 5845 |
29.04 |
| 2026-06-07 12:00 |
01:14:28.35 |
-04:14:43.0 |
HIP 5845 |
29.00 |
| 2026-06-08 00:00 |
01:14:28.78 |
-04:14:42.6 |
HIP 5845 |
28.96 |
| 2026-06-08 12:00 |
01:14:29.20 |
-04:14:42.2 |
HIP 5845 |
28.93 |
| 2026-06-09 00:00 |
01:14:29.62 |
-04:14:41.8 |
HIP 5845 |
28.89 |
| 2026-06-09 12:00 |
01:14:30.04 |
-04:14:41.5 |
HIP 5845 |
28.86 |
| 2026-06-10 00:00 |
01:14:30.45 |
-04:14:41.2 |
HIP 5845 |
28.83 |
| 2026-06-10 12:00 |
01:14:30.85 |
-04:14:41.0 |
HIP 5845 |
28.80 |
| 2026-06-11 00:00 |
01:14:31.25 |
-04:14:40.8 |
HIP 5845 |
28.77 |
| 2026-06-11 12:00 |
01:14:31.64 |
-04:14:40.7 |
HIP 5845 |
28.74 |
| 2026-06-12 00:00 |
01:14:32.03 |
-04:14:40.6 |
HIP 5845 |
28.72 |
| 2026-06-12 12:00 |
01:14:32.41 |
-04:14:40.5 |
HIP 5845 |
28.69 |
| 2026-06-13 00:00 |
01:14:32.78 |
-04:14:40.5 |
HIP 5845 |
28.67 |
| 2026-06-13 12:00 |
01:14:33.15 |
-04:14:40.6 |
HIP 5845 |
28.65 |
| 2026-06-14 00:00 |
01:14:33.51 |
-04:14:40.7 |
HIP 5845 |
28.63 |
| 2026-06-14 12:00 |
01:14:33.87 |
-04:14:40.8 |
HIP 5845 |
28.61 |
| 2026-06-15 00:00 |
01:14:34.22 |
-04:14:41.0 |
HIP 5845 |
28.59 |
| 2026-06-15 12:00 |
01:14:34.57 |
-04:14:41.2 |
HIP 5845 |
28.58 |
| 2026-06-16 00:00 |
01:14:34.91 |
-04:14:41.4 |
HIP 5845 |
28.56 |
| 2026-06-16 12:00 |
01:14:35.25 |
-04:14:41.7 |
HIP 5845 |
28.55 |
| 2026-06-17 00:00 |
01:14:35.58 |
-04:14:42.1 |
HIP 5845 |
28.54 |
| 2026-06-17 12:00 |
01:14:35.90 |
-04:14:42.5 |
HIP 5845 |
28.52 |
| 2026-06-18 00:00 |
01:14:36.22 |
-04:14:42.9 |
HIP 5845 |
28.51 |
| 2026-06-18 12:00 |
01:14:36.53 |
-04:14:43.4 |
HIP 5845 |
28.51 |
| 2026-06-19 00:00 |
01:14:36.83 |
-04:14:44.0 |
HIP 5845 |
28.50 |
| 2026-06-19 12:00 |
01:14:37.13 |
-04:14:44.5 |
HIP 5845 |
28.49 |
| 2026-06-20 00:00 |
01:14:37.43 |
-04:14:45.1 |
HIP 5845 |
28.49 |
| 2026-06-20 12:00 |
01:14:37.71 |
-04:14:45.8 |
HIP 5845 |
28.48 |
| 2026-06-21 00:00 |
01:14:37.99 |
-04:14:46.5 |
HIP 5845 |
28.48 |
| 2026-06-21 12:00 |
01:14:38.27 |
-04:14:47.3 |
HIP 5845 |
28.48 |
| 2026-06-22 00:00 |
01:14:38.54 |
-04:14:48.1 |
HIP 5845 |
28.48 |