C/2014 W7 (Christensen)
メタデータ
| 項目 |
値 |
| Designation |
C/2014 W7 (Christensen) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2014-12-31T14:55:39.754560Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:03Z |
| Obs used |
46 |
| NEO |
- |
| M1 |
16.300 |
| K1 |
10.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2014-12-11.0000000 |
| e |
0.86930062 |
| q (au) |
1.488259 |
| a (au) |
11.386888 |
| i (deg) |
98.313749 |
| Ω (om, deg) |
151.260997 |
| ω (w, deg) |
33.240158 |
| M (ma, deg) |
359.471035 |
等級
散乱 + 全体線形
$$
M_a = (16.710 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
16.710 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.988 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
22:29:59.03 |
-31:18:01.8 |
HIP 111051 |
17.30 |
| 2026-02-03 12:00 |
22:30:05.37 |
-31:17:27.9 |
HIP 111051 |
16.92 |
| 2026-02-04 00:00 |
22:30:11.73 |
-31:16:54.1 |
HIP 111051 |
16.66 |
| 2026-02-04 12:00 |
22:30:18.11 |
-31:16:20.4 |
HIP 111051 |
16.53 |
| 2026-02-05 00:00 |
22:30:24.51 |
-31:15:47.0 |
HIP 111051 |
16.54 |
| 2026-02-05 12:00 |
22:30:30.92 |
-31:15:13.7 |
HIP 111051 |
16.69 |
| 2026-02-06 00:00 |
22:30:37.35 |
-31:14:40.6 |
HIP 111051 |
16.97 |
| 2026-02-06 12:00 |
22:30:43.79 |
-31:14:07.7 |
HIP 111051 |
17.37 |
| 2026-02-07 00:00 |
22:30:50.25 |
-31:13:34.9 |
HIP 111228 |
16.87 |
| 2026-02-07 12:00 |
22:30:56.73 |
-31:13:02.4 |
HIP 111228 |
15.41 |
| 2026-02-08 00:00 |
22:31:03.22 |
-31:12:30.0 |
HIP 111228 |
13.95 |
| 2026-02-08 12:00 |
22:31:09.73 |
-31:11:57.8 |
HIP 111228 |
12.50 |
| 2026-02-09 00:00 |
22:31:16.25 |
-31:11:25.8 |
HIP 111228 |
11.05 |
| 2026-02-09 12:00 |
22:31:22.78 |
-31:10:54.0 |
HIP 111228 |
9.62 |
| 2026-02-10 00:00 |
22:31:29.33 |
-31:10:22.4 |
HIP 111228 |
8.21 |
| 2026-02-10 12:00 |
22:31:35.89 |
-31:09:51.0 |
HIP 111228 |
6.83 |
| 2026-02-11 00:00 |
22:31:42.46 |
-31:09:19.8 |
HIP 111228 |
5.50 |
| 2026-02-11 12:00 |
22:31:49.04 |
-31:08:48.8 |
HIP 111228 |
4.29 |
| 2026-02-12 00:00 |
22:31:55.64 |
-31:08:18.0 |
HIP 111228 |
3.32 |
| 2026-02-12 12:00 |
22:32:02.25 |
-31:07:47.4 |
HIP 111228 |
2.85 |
| 2026-02-13 00:00 |
22:32:08.87 |
-31:07:17.1 |
HIP 111228 |
3.12 |
| 2026-02-13 12:00 |
22:32:15.49 |
-31:06:46.9 |
HIP 111228 |
3.98 |
| 2026-02-14 00:00 |
22:32:22.13 |
-31:06:17.0 |
HIP 111228 |
5.14 |
| 2026-02-14 12:00 |
22:32:28.78 |
-31:05:47.3 |
HIP 111228 |
6.45 |
| 2026-02-15 00:00 |
22:32:35.44 |
-31:05:17.8 |
HIP 111228 |
7.82 |
| 2026-02-15 12:00 |
22:32:42.11 |
-31:04:48.5 |
HIP 111228 |
9.24 |
| 2026-02-16 00:00 |
22:32:48.78 |
-31:04:19.5 |
HIP 111228 |
10.68 |
| 2026-02-16 12:00 |
22:32:55.46 |
-31:03:50.7 |
HIP 111265 |
12.08 |
| 2026-02-17 00:00 |
22:33:02.15 |
-31:03:22.1 |
HIP 111265 |
13.18 |
| 2026-02-17 12:00 |
22:33:08.85 |
-31:02:53.8 |
HIP 111265 |
14.36 |
| 2026-02-18 00:00 |
22:33:15.55 |
-31:02:25.7 |
HIP 111265 |
15.60 |
| 2026-02-18 12:00 |
22:33:22.26 |
-31:01:57.8 |
HIP 111265 |
16.87 |
| 2026-02-19 00:00 |
22:33:28.97 |
-31:01:30.2 |
HIP 111265 |
18.18 |
| 2026-02-19 12:00 |
22:33:35.69 |
-31:01:02.9 |
HIP 111265 |
19.52 |
| 2026-02-20 00:00 |
22:33:42.41 |
-31:00:35.7 |
HIP 111265 |
20.88 |
| 2026-02-20 12:00 |
22:33:49.14 |
-31:00:08.9 |
HIP 111265 |
22.25 |
| 2026-02-21 00:00 |
22:33:55.87 |
-30:59:42.3 |
HIP 111265 |
23.64 |
| 2026-02-21 12:00 |
22:34:02.61 |
-30:59:15.9 |
HIP 111265 |
25.04 |
| 2026-02-22 00:00 |
22:34:09.34 |
-30:58:49.8 |
HIP 111490 |
25.79 |
| 2026-02-22 12:00 |
22:34:16.08 |
-30:58:24.0 |
HIP 111490 |
24.63 |
| 2026-02-23 00:00 |
22:34:22.83 |
-30:57:58.4 |
HIP 111490 |
23.52 |
| 2026-02-23 12:00 |
22:34:29.57 |
-30:57:33.1 |
HIP 111490 |
22.45 |
| 2026-02-24 00:00 |
22:34:36.31 |
-30:57:08.0 |
HIP 111490 |
21.44 |