メタデータ
| 項目 |
値 |
| Designation |
C/1898 F1 (Perrine) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1898-03-17T15:10:30.002880Z |
| Orbit solution date (soln_date, UTC) |
2023-10-09T20:36:13Z |
| Obs used |
327 |
| NEO |
- |
| M1 |
6.400 |
| K1 |
10.750 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1898-05-18.0000000 |
| e |
0.98044913 |
| q (au) |
1.095263 |
| a (au) |
56.021170 |
| i (deg) |
72.529160 |
| Ω (om, deg) |
263.867101 |
| ω (w, deg) |
47.308039 |
| M (ma, deg) |
0.144250 |
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) |
| 2026-03-26 00:00 |
06:28:48.11 |
-17:48:40.1 |
HIP 30918 |
7.91 |
| 2026-03-26 12:00 |
06:28:48.06 |
-17:48:28.7 |
HIP 30918 |
7.92 |
| 2026-03-27 00:00 |
06:28:48.03 |
-17:48:17.3 |
HIP 30918 |
7.94 |
| 2026-03-27 12:00 |
06:28:48.01 |
-17:48:05.9 |
HIP 30918 |
7.96 |
| 2026-03-28 00:00 |
06:28:48.00 |
-17:47:54.6 |
HIP 30918 |
7.98 |
| 2026-03-28 12:00 |
06:28:48.00 |
-17:47:43.2 |
HIP 30918 |
8.00 |
| 2026-03-29 00:00 |
06:28:48.01 |
-17:47:31.8 |
HIP 30918 |
8.03 |
| 2026-03-29 12:00 |
06:28:48.03 |
-17:47:20.5 |
HIP 30918 |
8.05 |
| 2026-03-30 00:00 |
06:28:48.06 |
-17:47:09.2 |
HIP 30918 |
8.08 |
| 2026-03-30 12:00 |
06:28:48.11 |
-17:46:57.8 |
HIP 30918 |
8.11 |
| 2026-03-31 00:00 |
06:28:48.16 |
-17:46:46.5 |
HIP 30918 |
8.15 |
| 2026-03-31 12:00 |
06:28:48.22 |
-17:46:35.2 |
HIP 30918 |
8.18 |
| 2026-04-01 00:00 |
06:28:48.30 |
-17:46:24.0 |
HIP 30918 |
8.22 |
| 2026-04-01 12:00 |
06:28:48.38 |
-17:46:12.7 |
HIP 30918 |
8.25 |
| 2026-04-02 00:00 |
06:28:48.48 |
-17:46:01.4 |
HIP 30918 |
8.29 |
| 2026-04-02 12:00 |
06:28:48.58 |
-17:45:50.2 |
HIP 30918 |
8.33 |
| 2026-04-03 00:00 |
06:28:48.70 |
-17:45:39.0 |
HIP 30918 |
8.38 |
| 2026-04-03 12:00 |
06:28:48.82 |
-17:45:27.8 |
HIP 30918 |
8.42 |
| 2026-04-04 00:00 |
06:28:48.96 |
-17:45:16.6 |
HIP 30918 |
8.47 |
| 2026-04-04 12:00 |
06:28:49.11 |
-17:45:05.4 |
HIP 30918 |
8.51 |
| 2026-04-05 00:00 |
06:28:49.26 |
-17:44:54.3 |
HIP 30918 |
8.56 |
| 2026-04-05 12:00 |
06:28:49.43 |
-17:44:43.2 |
HIP 30918 |
8.61 |
| 2026-04-06 00:00 |
06:28:49.61 |
-17:44:32.1 |
HIP 30918 |
8.66 |
| 2026-04-06 12:00 |
06:28:49.80 |
-17:44:21.0 |
HIP 30918 |
8.72 |
| 2026-04-07 00:00 |
06:28:50.00 |
-17:44:09.9 |
HIP 30918 |
8.77 |
| 2026-04-07 12:00 |
06:28:50.21 |
-17:43:58.9 |
HIP 30918 |
8.83 |
| 2026-04-08 00:00 |
06:28:50.43 |
-17:43:47.9 |
HIP 30918 |
8.89 |
| 2026-04-08 12:00 |
06:28:50.66 |
-17:43:36.9 |
HIP 30918 |
8.95 |
| 2026-04-09 00:00 |
06:28:50.90 |
-17:43:26.0 |
HIP 30918 |
9.01 |
| 2026-04-09 12:00 |
06:28:51.15 |
-17:43:15.0 |
HIP 30918 |
9.07 |
| 2026-04-10 00:00 |
06:28:51.41 |
-17:43:04.1 |
HIP 30918 |
9.13 |
| 2026-04-10 12:00 |
06:28:51.68 |
-17:42:53.3 |
HIP 30918 |
9.20 |
| 2026-04-11 00:00 |
06:28:51.96 |
-17:42:42.4 |
HIP 30918 |
9.26 |
| 2026-04-11 12:00 |
06:28:52.26 |
-17:42:31.6 |
HIP 30918 |
9.33 |
| 2026-04-12 00:00 |
06:28:52.56 |
-17:42:20.9 |
HIP 30918 |
9.40 |
| 2026-04-12 12:00 |
06:28:52.87 |
-17:42:10.1 |
HIP 30918 |
9.47 |
| 2026-04-13 00:00 |
06:28:53.19 |
-17:41:59.4 |
HIP 30918 |
9.54 |
| 2026-04-13 12:00 |
06:28:53.52 |
-17:41:48.7 |
HIP 30918 |
9.62 |
| 2026-04-14 00:00 |
06:28:53.87 |
-17:41:38.1 |
HIP 30918 |
9.69 |
| 2026-04-14 12:00 |
06:28:54.22 |
-17:41:27.5 |
HIP 30918 |
9.77 |
| 2026-04-15 00:00 |
06:28:54.58 |
-17:41:16.9 |
HIP 30918 |
9.84 |
| 2026-04-15 12:00 |
06:28:54.95 |
-17:41:06.4 |
HIP 30918 |
9.92 |
| 2026-04-16 00:00 |
06:28:55.34 |
-17:40:55.9 |
HIP 30918 |
10.00 |