メタデータ
| 項目 |
値 |
| Designation |
C/2015 H1 (Bressi) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2015-03-28T14:52:26.330880Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:09Z |
| Obs used |
210 |
| NEO |
- |
| M1 |
4.200 |
| K1 |
40.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2015-05-27.0000000 |
| e |
0.94079404 |
| q (au) |
1.926359 |
| a (au) |
32.536572 |
| i (deg) |
140.655574 |
| Ω (om, deg) |
325.804456 |
| ω (w, deg) |
21.756727 |
| M (ma, deg) |
0.315347 |
等級
散乱 + 全体線形
$$
M_a = (11.248 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.248 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
1.000 |
| δ90 |
10.000 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2015-04-20 |
2015-07-27 |
+16.3060 |
-4.976 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
10:12:26.78 |
+13:46:48.5 |
HIP 50124 |
22.54 |
| 2026-09-20 12:00 |
10:12:30.43 |
+13:46:25.9 |
HIP 50124 |
21.78 |
| 2026-09-21 00:00 |
10:12:34.07 |
+13:46:03.5 |
HIP 50124 |
21.04 |
| 2026-09-21 12:00 |
10:12:37.70 |
+13:45:41.2 |
HIP 50124 |
20.32 |
| 2026-09-22 00:00 |
10:12:41.30 |
+13:45:19.1 |
HIP 50124 |
19.63 |
| 2026-09-22 12:00 |
10:12:44.89 |
+13:44:57.0 |
HIP 50124 |
18.96 |
| 2026-09-23 00:00 |
10:12:48.46 |
+13:44:35.1 |
HIP 50124 |
18.31 |
| 2026-09-23 12:00 |
10:12:52.01 |
+13:44:13.2 |
HIP 50124 |
17.70 |
| 2026-09-24 00:00 |
10:12:55.55 |
+13:43:51.5 |
HIP 50124 |
17.12 |
| 2026-09-24 12:00 |
10:12:59.06 |
+13:43:30.0 |
HIP 50124 |
16.57 |
| 2026-09-25 00:00 |
10:13:02.56 |
+13:43:08.5 |
HIP 50124 |
16.06 |
| 2026-09-25 12:00 |
10:13:06.04 |
+13:42:47.2 |
HIP 50124 |
15.59 |
| 2026-09-26 00:00 |
10:13:09.50 |
+13:42:26.0 |
HIP 50124 |
15.17 |
| 2026-09-26 12:00 |
10:13:12.94 |
+13:42:04.9 |
HIP 50124 |
14.79 |
| 2026-09-27 00:00 |
10:13:16.36 |
+13:41:44.0 |
HIP 50124 |
14.45 |
| 2026-09-27 12:00 |
10:13:19.75 |
+13:41:23.1 |
HIP 50124 |
14.17 |
| 2026-09-28 00:00 |
10:13:23.13 |
+13:41:02.5 |
HIP 50124 |
13.94 |
| 2026-09-28 12:00 |
10:13:26.49 |
+13:40:41.9 |
HIP 50124 |
13.77 |
| 2026-09-29 00:00 |
10:13:29.83 |
+13:40:21.5 |
HIP 50124 |
13.65 |
| 2026-09-29 12:00 |
10:13:33.15 |
+13:40:01.2 |
HIP 50124 |
13.59 |
| 2026-09-30 00:00 |
10:13:36.44 |
+13:39:41.1 |
HIP 50124 |
13.58 |
| 2026-09-30 12:00 |
10:13:39.72 |
+13:39:21.1 |
HIP 50124 |
13.63 |
| 2026-10-01 00:00 |
10:13:42.97 |
+13:39:01.2 |
HIP 50124 |
13.73 |
| 2026-10-01 12:00 |
10:13:46.20 |
+13:38:41.5 |
HIP 50124 |
13.89 |
| 2026-10-02 00:00 |
10:13:49.41 |
+13:38:21.9 |
HIP 50124 |
14.09 |
| 2026-10-02 12:00 |
10:13:52.59 |
+13:38:02.4 |
HIP 50124 |
14.33 |
| 2026-10-03 00:00 |
10:13:55.75 |
+13:37:43.1 |
HIP 50124 |
14.62 |
| 2026-10-03 12:00 |
10:13:58.89 |
+13:37:24.0 |
HIP 50124 |
14.94 |
| 2026-10-04 00:00 |
10:14:02.01 |
+13:37:05.0 |
HIP 50124 |
15.30 |
| 2026-10-04 12:00 |
10:14:05.10 |
+13:36:46.1 |
HIP 50124 |
15.70 |
| 2026-10-05 00:00 |
10:14:08.17 |
+13:36:27.4 |
HIP 50124 |
16.12 |
| 2026-10-05 12:00 |
10:14:11.21 |
+13:36:08.9 |
HIP 50124 |
16.56 |
| 2026-10-06 00:00 |
10:14:14.23 |
+13:35:50.5 |
HIP 50124 |
17.03 |
| 2026-10-06 12:00 |
10:14:17.23 |
+13:35:32.3 |
HIP 50124 |
17.51 |
| 2026-10-07 00:00 |
10:14:20.20 |
+13:35:14.2 |
HIP 50124 |
18.02 |
| 2026-10-07 12:00 |
10:14:23.14 |
+13:34:56.2 |
HIP 50124 |
18.54 |
| 2026-10-08 00:00 |
10:14:26.06 |
+13:34:38.5 |
HIP 50124 |
19.07 |
| 2026-10-08 12:00 |
10:14:28.95 |
+13:34:20.9 |
HIP 50124 |
19.61 |
| 2026-10-09 00:00 |
10:14:31.82 |
+13:34:03.4 |
HIP 50124 |
20.16 |
| 2026-10-09 12:00 |
10:14:34.66 |
+13:33:46.2 |
HIP 50124 |
20.72 |
| 2026-10-10 00:00 |
10:14:37.47 |
+13:33:29.1 |
HIP 50124 |
21.28 |
| 2026-10-10 12:00 |
10:14:40.26 |
+13:33:12.1 |
HIP 50124 |
21.85 |
| 2026-10-11 00:00 |
10:14:43.02 |
+13:32:55.3 |
HIP 50124 |
22.42 |