C/1898 F1 (Perrine)
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) |
| 2026-02-03 00:00 |
06:29:45.39 |
-18:05:51.8 |
HIP 31030 |
16.67 |
| 2026-02-03 12:00 |
06:29:44.39 |
-18:05:44.3 |
HIP 31030 |
16.77 |
| 2026-02-04 00:00 |
06:29:43.39 |
-18:05:36.8 |
HIP 31030 |
16.88 |
| 2026-02-04 12:00 |
06:29:42.40 |
-18:05:29.3 |
HIP 31030 |
17.00 |
| 2026-02-05 00:00 |
06:29:41.42 |
-18:05:21.6 |
HIP 31030 |
17.11 |
| 2026-02-05 12:00 |
06:29:40.44 |
-18:05:13.9 |
HIP 30918 |
17.06 |
| 2026-02-06 00:00 |
06:29:39.47 |
-18:05:06.1 |
HIP 30918 |
16.88 |
| 2026-02-06 12:00 |
06:29:38.51 |
-18:04:58.2 |
HIP 30918 |
16.69 |
| 2026-02-07 00:00 |
06:29:37.56 |
-18:04:50.2 |
HIP 30918 |
16.51 |
| 2026-02-07 12:00 |
06:29:36.61 |
-18:04:42.2 |
HIP 30918 |
16.33 |
| 2026-02-08 00:00 |
06:29:35.67 |
-18:04:34.1 |
HIP 30918 |
16.15 |
| 2026-02-08 12:00 |
06:29:34.74 |
-18:04:25.9 |
HIP 30918 |
15.97 |
| 2026-02-09 00:00 |
06:29:33.81 |
-18:04:17.6 |
HIP 30918 |
15.79 |
| 2026-02-09 12:00 |
06:29:32.90 |
-18:04:09.3 |
HIP 30918 |
15.61 |
| 2026-02-10 00:00 |
06:29:31.99 |
-18:04:00.9 |
HIP 30918 |
15.44 |
| 2026-02-10 12:00 |
06:29:31.08 |
-18:03:52.5 |
HIP 30918 |
15.26 |
| 2026-02-11 00:00 |
06:29:30.19 |
-18:03:43.9 |
HIP 30918 |
15.09 |
| 2026-02-11 12:00 |
06:29:29.30 |
-18:03:35.3 |
HIP 30918 |
14.92 |
| 2026-02-12 00:00 |
06:29:28.42 |
-18:03:26.7 |
HIP 30918 |
14.75 |
| 2026-02-12 12:00 |
06:29:27.55 |
-18:03:17.9 |
HIP 30918 |
14.59 |
| 2026-02-13 00:00 |
06:29:26.69 |
-18:03:09.1 |
HIP 30918 |
14.42 |
| 2026-02-13 12:00 |
06:29:25.84 |
-18:03:00.3 |
HIP 30918 |
14.26 |
| 2026-02-14 00:00 |
06:29:24.99 |
-18:02:51.3 |
HIP 30918 |
14.10 |
| 2026-02-14 12:00 |
06:29:24.15 |
-18:02:42.3 |
HIP 30918 |
13.93 |
| 2026-02-15 00:00 |
06:29:23.32 |
-18:02:33.3 |
HIP 30918 |
13.78 |
| 2026-02-15 12:00 |
06:29:22.50 |
-18:02:24.1 |
HIP 30918 |
13.62 |
| 2026-02-16 00:00 |
06:29:21.69 |
-18:02:14.9 |
HIP 30918 |
13.46 |
| 2026-02-16 12:00 |
06:29:20.89 |
-18:02:05.7 |
HIP 30918 |
13.31 |
| 2026-02-17 00:00 |
06:29:20.09 |
-18:01:56.4 |
HIP 30918 |
13.16 |
| 2026-02-17 12:00 |
06:29:19.30 |
-18:01:47.0 |
HIP 30918 |
13.01 |
| 2026-02-18 00:00 |
06:29:18.53 |
-18:01:37.6 |
HIP 30918 |
12.86 |
| 2026-02-18 12:00 |
06:29:17.76 |
-18:01:28.1 |
HIP 30918 |
12.71 |
| 2026-02-19 00:00 |
06:29:17.00 |
-18:01:18.6 |
HIP 30918 |
12.56 |
| 2026-02-19 12:00 |
06:29:16.25 |
-18:01:09.0 |
HIP 30918 |
12.42 |
| 2026-02-20 00:00 |
06:29:15.50 |
-18:00:59.3 |
HIP 30918 |
12.28 |
| 2026-02-20 12:00 |
06:29:14.77 |
-18:00:49.6 |
HIP 30918 |
12.14 |
| 2026-02-21 00:00 |
06:29:14.04 |
-18:00:39.9 |
HIP 30918 |
12.00 |
| 2026-02-21 12:00 |
06:29:13.33 |
-18:00:30.0 |
HIP 30918 |
11.87 |
| 2026-02-22 00:00 |
06:29:12.62 |
-18:00:20.2 |
HIP 30918 |
11.73 |
| 2026-02-22 12:00 |
06:29:11.93 |
-18:00:10.3 |
HIP 30918 |
11.60 |
| 2026-02-23 00:00 |
06:29:11.24 |
-18:00:00.3 |
HIP 30918 |
11.47 |
| 2026-02-23 12:00 |
06:29:10.56 |
-17:59:50.3 |
HIP 30918 |
11.34 |
| 2026-02-24 00:00 |
06:29:09.89 |
-17:59:40.2 |
HIP 30918 |
11.22 |