メタデータ
| 項目 |
値 |
| Designation |
C/1898 U1 (Brooks) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1898-11-23T15:38:33.040320Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:28:55Z |
| Obs used |
60 |
| 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) |
1898-11-05.0000000 |
| e |
1.00000000 |
| q (au) |
0.756018 |
| a (au) |
- |
| i (deg) |
140.344759 |
| Ω (om, deg) |
97.741144 |
| ω (w, deg) |
123.548388 |
| M (ma, deg) |
- |
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 |
09:37:09.71 |
-23:17:37.1 |
HIP 47372 |
29.26 |
| 2026-06-01 12:00 |
09:37:09.97 |
-23:17:30.9 |
HIP 47372 |
29.17 |
| 2026-06-02 00:00 |
09:37:10.23 |
-23:17:24.6 |
HIP 47372 |
29.07 |
| 2026-06-02 12:00 |
09:37:10.51 |
-23:17:18.5 |
HIP 47372 |
28.97 |
| 2026-06-03 00:00 |
09:37:10.78 |
-23:17:12.4 |
HIP 47372 |
28.87 |
| 2026-06-03 12:00 |
09:37:11.07 |
-23:17:06.3 |
HIP 47372 |
28.77 |
| 2026-06-04 00:00 |
09:37:11.36 |
-23:17:00.3 |
HIP 47372 |
28.67 |
| 2026-06-04 12:00 |
09:37:11.66 |
-23:16:54.3 |
HIP 47372 |
28.57 |
| 2026-06-05 00:00 |
09:37:11.96 |
-23:16:48.4 |
HIP 47372 |
28.47 |
| 2026-06-05 12:00 |
09:37:12.27 |
-23:16:42.5 |
HIP 47372 |
28.36 |
| 2026-06-06 00:00 |
09:37:12.59 |
-23:16:36.7 |
HIP 47372 |
28.26 |
| 2026-06-06 12:00 |
09:37:12.91 |
-23:16:30.9 |
HIP 47372 |
28.15 |
| 2026-06-07 00:00 |
09:37:13.24 |
-23:16:25.1 |
HIP 47372 |
28.05 |
| 2026-06-07 12:00 |
09:37:13.58 |
-23:16:19.5 |
HIP 47372 |
27.94 |
| 2026-06-08 00:00 |
09:37:13.93 |
-23:16:13.8 |
HIP 47372 |
27.83 |
| 2026-06-08 12:00 |
09:37:14.28 |
-23:16:08.3 |
HIP 47372 |
27.72 |
| 2026-06-09 00:00 |
09:37:14.63 |
-23:16:02.7 |
HIP 47372 |
27.61 |
| 2026-06-09 12:00 |
09:37:15.00 |
-23:15:57.3 |
HIP 47372 |
27.50 |
| 2026-06-10 00:00 |
09:37:15.37 |
-23:15:51.9 |
HIP 47372 |
27.39 |
| 2026-06-10 12:00 |
09:37:15.74 |
-23:15:46.5 |
HIP 47372 |
27.27 |
| 2026-06-11 00:00 |
09:37:16.12 |
-23:15:41.2 |
HIP 47372 |
27.16 |
| 2026-06-11 12:00 |
09:37:16.51 |
-23:15:35.9 |
HIP 47372 |
27.04 |
| 2026-06-12 00:00 |
09:37:16.91 |
-23:15:30.7 |
HIP 47372 |
26.93 |
| 2026-06-12 12:00 |
09:37:17.31 |
-23:15:25.6 |
HIP 47372 |
26.81 |
| 2026-06-13 00:00 |
09:37:17.72 |
-23:15:20.5 |
HIP 47372 |
26.69 |
| 2026-06-13 12:00 |
09:37:18.13 |
-23:15:15.5 |
HIP 47372 |
26.57 |
| 2026-06-14 00:00 |
09:37:18.55 |
-23:15:10.5 |
HIP 47372 |
26.45 |
| 2026-06-14 12:00 |
09:37:18.98 |
-23:15:05.5 |
HIP 47372 |
26.33 |
| 2026-06-15 00:00 |
09:37:19.41 |
-23:15:00.7 |
HIP 47372 |
26.21 |
| 2026-06-15 12:00 |
09:37:19.85 |
-23:14:55.9 |
HIP 47372 |
26.09 |
| 2026-06-16 00:00 |
09:37:20.29 |
-23:14:51.1 |
HIP 47372 |
25.97 |
| 2026-06-16 12:00 |
09:37:20.74 |
-23:14:46.4 |
HIP 47372 |
25.84 |
| 2026-06-17 00:00 |
09:37:21.20 |
-23:14:41.8 |
HIP 47372 |
25.72 |
| 2026-06-17 12:00 |
09:37:21.66 |
-23:14:37.2 |
HIP 47372 |
25.59 |
| 2026-06-18 00:00 |
09:37:22.13 |
-23:14:32.7 |
HIP 47372 |
25.46 |
| 2026-06-18 12:00 |
09:37:22.61 |
-23:14:28.2 |
HIP 47372 |
25.34 |
| 2026-06-19 00:00 |
09:37:23.09 |
-23:14:23.8 |
HIP 47372 |
25.21 |
| 2026-06-19 12:00 |
09:37:23.57 |
-23:14:19.5 |
HIP 47372 |
25.08 |
| 2026-06-20 00:00 |
09:37:24.06 |
-23:14:15.2 |
HIP 47372 |
24.95 |
| 2026-06-20 12:00 |
09:37:24.56 |
-23:14:11.0 |
HIP 47372 |
24.82 |
| 2026-06-21 00:00 |
09:37:25.06 |
-23:14:06.8 |
HIP 47372 |
24.68 |
| 2026-06-21 12:00 |
09:37:25.57 |
-23:14:02.7 |
HIP 47372 |
24.55 |
| 2026-06-22 00:00 |
09:37:26.09 |
-23:13:58.6 |
HIP 47372 |
24.42 |