メタデータ
| 項目 |
値 |
| Designation |
C/1885 X1 (Fabry) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1886-04-06T10:56:04.807680Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:28:53Z |
| Obs used |
46 |
| 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) |
1886-01-18.0000000 |
| e |
1.00038711 |
| q (au) |
0.642383 |
| a (au) |
-1659.415920 |
| i (deg) |
82.629776 |
| Ω (om, deg) |
37.962462 |
| ω (w, deg) |
126.588976 |
| M (ma, deg) |
-0.001144 |
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 |
03:20:52.05 |
-45:01:23.9 |
HIP 15548 |
10.48 |
| 2026-06-01 12:00 |
03:20:53.05 |
-45:01:25.6 |
HIP 15548 |
10.55 |
| 2026-06-02 00:00 |
03:20:54.05 |
-45:01:27.4 |
HIP 15548 |
10.63 |
| 2026-06-02 12:00 |
03:20:55.04 |
-45:01:29.3 |
HIP 15548 |
10.70 |
| 2026-06-03 00:00 |
03:20:56.04 |
-45:01:31.3 |
HIP 15548 |
10.78 |
| 2026-06-03 12:00 |
03:20:57.03 |
-45:01:33.4 |
HIP 15548 |
10.85 |
| 2026-06-04 00:00 |
03:20:58.01 |
-45:01:35.5 |
HIP 15548 |
10.93 |
| 2026-06-04 12:00 |
03:20:59.00 |
-45:01:37.8 |
HIP 15548 |
11.01 |
| 2026-06-05 00:00 |
03:20:59.98 |
-45:01:40.1 |
HIP 15548 |
11.09 |
| 2026-06-05 12:00 |
03:21:00.95 |
-45:01:42.5 |
HIP 15548 |
11.17 |
| 2026-06-06 00:00 |
03:21:01.93 |
-45:01:45.0 |
HIP 15548 |
11.26 |
| 2026-06-06 12:00 |
03:21:02.90 |
-45:01:47.6 |
HIP 15548 |
11.34 |
| 2026-06-07 00:00 |
03:21:03.87 |
-45:01:50.3 |
HIP 15548 |
11.42 |
| 2026-06-07 12:00 |
03:21:04.83 |
-45:01:53.0 |
HIP 15548 |
11.50 |
| 2026-06-08 00:00 |
03:21:05.79 |
-45:01:55.9 |
HIP 15548 |
11.59 |
| 2026-06-08 12:00 |
03:21:06.75 |
-45:01:58.8 |
HIP 15548 |
11.67 |
| 2026-06-09 00:00 |
03:21:07.70 |
-45:02:01.8 |
HIP 15548 |
11.76 |
| 2026-06-09 12:00 |
03:21:08.65 |
-45:02:04.9 |
HIP 15548 |
11.85 |
| 2026-06-10 00:00 |
03:21:09.60 |
-45:02:08.1 |
HIP 15548 |
11.93 |
| 2026-06-10 12:00 |
03:21:10.54 |
-45:02:11.3 |
HIP 15548 |
12.02 |
| 2026-06-11 00:00 |
03:21:11.48 |
-45:02:14.6 |
HIP 15548 |
12.11 |
| 2026-06-11 12:00 |
03:21:12.42 |
-45:02:18.1 |
HIP 15548 |
12.20 |
| 2026-06-12 00:00 |
03:21:13.35 |
-45:02:21.6 |
HIP 15548 |
12.28 |
| 2026-06-12 12:00 |
03:21:14.27 |
-45:02:25.2 |
HIP 15548 |
12.37 |
| 2026-06-13 00:00 |
03:21:15.20 |
-45:02:28.8 |
HIP 15548 |
12.46 |
| 2026-06-13 12:00 |
03:21:16.12 |
-45:02:32.6 |
HIP 15548 |
12.55 |
| 2026-06-14 00:00 |
03:21:17.03 |
-45:02:36.4 |
HIP 15548 |
12.64 |
| 2026-06-14 12:00 |
03:21:17.94 |
-45:02:40.3 |
HIP 15548 |
12.73 |
| 2026-06-15 00:00 |
03:21:18.84 |
-45:02:44.3 |
HIP 15548 |
12.82 |
| 2026-06-15 12:00 |
03:21:19.74 |
-45:02:48.4 |
HIP 15548 |
12.91 |
| 2026-06-16 00:00 |
03:21:20.64 |
-45:02:52.5 |
HIP 15548 |
13.01 |
| 2026-06-16 12:00 |
03:21:21.53 |
-45:02:56.8 |
HIP 15548 |
13.10 |
| 2026-06-17 00:00 |
03:21:22.42 |
-45:03:01.1 |
HIP 15548 |
13.19 |
| 2026-06-17 12:00 |
03:21:23.30 |
-45:03:05.5 |
HIP 15548 |
13.28 |
| 2026-06-18 00:00 |
03:21:24.18 |
-45:03:10.0 |
HIP 15548 |
13.37 |
| 2026-06-18 12:00 |
03:21:25.05 |
-45:03:14.5 |
HIP 15548 |
13.46 |
| 2026-06-19 00:00 |
03:21:25.92 |
-45:03:19.1 |
HIP 15548 |
13.56 |
| 2026-06-19 12:00 |
03:21:26.78 |
-45:03:23.9 |
HIP 15548 |
13.65 |
| 2026-06-20 00:00 |
03:21:27.63 |
-45:03:28.6 |
HIP 15548 |
13.74 |
| 2026-06-20 12:00 |
03:21:28.49 |
-45:03:33.5 |
HIP 15548 |
13.83 |
| 2026-06-21 00:00 |
03:21:29.33 |
-45:03:38.4 |
HIP 15548 |
13.92 |
| 2026-06-21 12:00 |
03:21:30.17 |
-45:03:43.5 |
HIP 15548 |
14.02 |
| 2026-06-22 00:00 |
03:21:31.01 |
-45:03:48.6 |
HIP 15548 |
14.11 |