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) |
| 2026-06-01 00:00 |
22:49:05.30 |
-31:27:15.4 |
HIP 112692 |
15.25 |
| 2026-06-01 12:00 |
22:49:05.55 |
-31:28:01.1 |
HIP 112692 |
15.99 |
| 2026-06-02 00:00 |
22:49:05.74 |
-31:28:47.0 |
HIP 112692 |
16.74 |
| 2026-06-02 12:00 |
22:49:05.88 |
-31:29:33.3 |
HIP 112692 |
17.50 |
| 2026-06-03 00:00 |
22:49:05.96 |
-31:30:19.9 |
HIP 112692 |
18.27 |
| 2026-06-03 12:00 |
22:49:05.99 |
-31:31:06.8 |
HIP 112692 |
19.04 |
| 2026-06-04 00:00 |
22:49:05.96 |
-31:31:54.0 |
HIP 112692 |
19.82 |
| 2026-06-04 12:00 |
22:49:05.87 |
-31:32:41.4 |
HIP 112692 |
20.61 |
| 2026-06-05 00:00 |
22:49:05.72 |
-31:33:29.2 |
HIP 112692 |
21.41 |
| 2026-06-05 12:00 |
22:49:05.51 |
-31:34:17.3 |
HIP 112692 |
22.21 |
| 2026-06-06 00:00 |
22:49:05.25 |
-31:35:05.6 |
HIP 112692 |
23.01 |
| 2026-06-06 12:00 |
22:49:04.93 |
-31:35:54.2 |
HIP 112692 |
23.83 |
| 2026-06-07 00:00 |
22:49:04.55 |
-31:36:43.2 |
HIP 112692 |
24.65 |
| 2026-06-07 12:00 |
22:49:04.12 |
-31:37:32.4 |
HIP 112692 |
25.47 |
| 2026-06-08 00:00 |
22:49:03.62 |
-31:38:21.9 |
HIP 112664 |
25.54 |
| 2026-06-08 12:00 |
22:49:03.07 |
-31:39:11.6 |
HIP 112664 |
24.71 |
| 2026-06-09 00:00 |
22:49:02.46 |
-31:40:01.6 |
HIP 112664 |
23.87 |
| 2026-06-09 12:00 |
22:49:01.80 |
-31:40:51.9 |
HIP 112664 |
23.03 |
| 2026-06-10 00:00 |
22:49:01.07 |
-31:41:42.5 |
HIP 112664 |
22.18 |
| 2026-06-10 12:00 |
22:49:00.29 |
-31:42:33.4 |
HIP 112664 |
21.33 |
| 2026-06-11 00:00 |
22:48:59.45 |
-31:43:24.5 |
HIP 112664 |
20.47 |
| 2026-06-11 12:00 |
22:48:58.55 |
-31:44:15.8 |
HIP 112664 |
19.62 |
| 2026-06-12 00:00 |
22:48:57.59 |
-31:45:07.4 |
HIP 112664 |
18.76 |
| 2026-06-12 12:00 |
22:48:56.57 |
-31:45:59.3 |
HIP 112664 |
17.90 |
| 2026-06-13 00:00 |
22:48:55.50 |
-31:46:51.4 |
HIP 112664 |
17.04 |
| 2026-06-13 12:00 |
22:48:54.36 |
-31:47:43.8 |
HIP 112664 |
16.18 |
| 2026-06-14 00:00 |
22:48:53.17 |
-31:48:36.4 |
HIP 112664 |
15.32 |
| 2026-06-14 12:00 |
22:48:51.92 |
-31:49:29.3 |
HIP 112664 |
14.46 |
| 2026-06-15 00:00 |
22:48:50.61 |
-31:50:22.4 |
HIP 112664 |
13.62 |
| 2026-06-15 12:00 |
22:48:49.25 |
-31:51:15.7 |
HIP 112664 |
12.78 |
| 2026-06-16 00:00 |
22:48:47.82 |
-31:52:09.2 |
HIP 112664 |
11.95 |
| 2026-06-16 12:00 |
22:48:46.34 |
-31:53:03.0 |
HIP 112664 |
11.14 |
| 2026-06-17 00:00 |
22:48:44.80 |
-31:53:57.0 |
HIP 112664 |
10.36 |
| 2026-06-17 12:00 |
22:48:43.20 |
-31:54:51.2 |
HIP 112664 |
9.60 |
| 2026-06-18 00:00 |
22:48:41.55 |
-31:55:45.7 |
HIP 112664 |
8.89 |
| 2026-06-18 12:00 |
22:48:39.83 |
-31:56:40.3 |
HIP 112664 |
8.24 |
| 2026-06-19 00:00 |
22:48:38.06 |
-31:57:35.2 |
HIP 112664 |
7.66 |
| 2026-06-19 12:00 |
22:48:36.23 |
-31:58:30.2 |
HIP 112664 |
7.18 |
| 2026-06-20 00:00 |
22:48:34.34 |
-31:59:25.5 |
HIP 112664 |
6.81 |
| 2026-06-20 12:00 |
22:48:32.40 |
-32:00:20.9 |
HIP 112664 |
6.59 |
| 2026-06-21 00:00 |
22:48:30.39 |
-32:01:16.6 |
HIP 112664 |
6.53 |
| 2026-06-21 12:00 |
22:48:28.34 |
-32:02:12.4 |
HIP 112664 |
6.64 |
| 2026-06-22 00:00 |
22:48:26.22 |
-32:03:08.4 |
HIP 112664 |
6.91 |