C/2015 C2 (SWAN)
メタデータ
| 項目 |
値 |
| Designation |
C/2015 C2 (SWAN) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2015-03-04T13:33:59.673600Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:06Z |
| Obs used |
151 |
| NEO |
- |
| M1 |
12.700 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2015-04-26.0000000 |
| e |
0.99851030 |
| q (au) |
0.711377 |
| a (au) |
477.531702 |
| i (deg) |
94.501074 |
| Ω (om, deg) |
49.529700 |
| ω (w, deg) |
334.134062 |
| M (ma, deg) |
0.004952 |
等級
散乱 + 全体線形
$$
M_a = (14.217 + 3.643\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.217 |
| n |
3.643 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.800 |
| 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 |
16:18:01.10 |
+23:21:33.6 |
HIP 79846 |
15.03 |
| 2026-02-03 12:00 |
16:18:02.83 |
+23:22:11.4 |
HIP 79846 |
14.48 |
| 2026-02-04 00:00 |
16:18:04.53 |
+23:22:49.3 |
HIP 79846 |
13.93 |
| 2026-02-04 12:00 |
16:18:06.18 |
+23:23:27.5 |
HIP 79846 |
13.40 |
| 2026-02-05 00:00 |
16:18:07.80 |
+23:24:06.0 |
HIP 79846 |
12.89 |
| 2026-02-05 12:00 |
16:18:09.38 |
+23:24:44.6 |
HIP 79846 |
12.38 |
| 2026-02-06 00:00 |
16:18:10.92 |
+23:25:23.5 |
HIP 79846 |
11.90 |
| 2026-02-06 12:00 |
16:18:12.42 |
+23:26:02.5 |
HIP 79846 |
11.44 |
| 2026-02-07 00:00 |
16:18:13.88 |
+23:26:41.8 |
HIP 79846 |
11.00 |
| 2026-02-07 12:00 |
16:18:15.31 |
+23:27:21.3 |
HIP 79846 |
10.59 |
| 2026-02-08 00:00 |
16:18:16.69 |
+23:28:01.0 |
HIP 79846 |
10.20 |
| 2026-02-08 12:00 |
16:18:18.04 |
+23:28:40.9 |
HIP 79846 |
9.85 |
| 2026-02-09 00:00 |
16:18:19.35 |
+23:29:21.0 |
HIP 79846 |
9.53 |
| 2026-02-09 12:00 |
16:18:20.62 |
+23:30:01.3 |
HIP 79846 |
9.25 |
| 2026-02-10 00:00 |
16:18:21.84 |
+23:30:41.9 |
HIP 79846 |
9.01 |
| 2026-02-10 12:00 |
16:18:23.03 |
+23:31:22.5 |
HIP 79846 |
8.81 |
| 2026-02-11 00:00 |
16:18:24.18 |
+23:32:03.4 |
HIP 79846 |
8.67 |
| 2026-02-11 12:00 |
16:18:25.29 |
+23:32:44.5 |
HIP 79846 |
8.57 |
| 2026-02-12 00:00 |
16:18:26.36 |
+23:33:25.8 |
HIP 79846 |
8.53 |
| 2026-02-12 12:00 |
16:18:27.39 |
+23:34:07.2 |
HIP 79846 |
8.53 |
| 2026-02-13 00:00 |
16:18:28.38 |
+23:34:48.8 |
HIP 79846 |
8.59 |
| 2026-02-13 12:00 |
16:18:29.33 |
+23:35:30.6 |
HIP 79846 |
8.71 |
| 2026-02-14 00:00 |
16:18:30.23 |
+23:36:12.5 |
HIP 79846 |
8.87 |
| 2026-02-14 12:00 |
16:18:31.10 |
+23:36:54.6 |
HIP 79846 |
9.08 |
| 2026-02-15 00:00 |
16:18:31.93 |
+23:37:36.9 |
HIP 79846 |
9.33 |
| 2026-02-15 12:00 |
16:18:32.71 |
+23:38:19.3 |
HIP 79846 |
9.62 |
| 2026-02-16 00:00 |
16:18:33.45 |
+23:39:01.9 |
HIP 79914 |
9.41 |
| 2026-02-16 12:00 |
16:18:34.16 |
+23:39:44.7 |
HIP 79914 |
8.68 |
| 2026-02-17 00:00 |
16:18:34.82 |
+23:40:27.6 |
HIP 79914 |
7.95 |
| 2026-02-17 12:00 |
16:18:35.44 |
+23:41:10.6 |
HIP 79914 |
7.22 |
| 2026-02-18 00:00 |
16:18:36.02 |
+23:41:53.8 |
HIP 79914 |
6.49 |
| 2026-02-18 12:00 |
16:18:36.56 |
+23:42:37.1 |
HIP 79914 |
5.76 |
| 2026-02-19 00:00 |
16:18:37.05 |
+23:43:20.5 |
HIP 79914 |
5.03 |
| 2026-02-19 12:00 |
16:18:37.51 |
+23:44:04.1 |
HIP 79914 |
4.30 |
| 2026-02-20 00:00 |
16:18:37.92 |
+23:44:47.8 |
HIP 79914 |
3.58 |
| 2026-02-20 12:00 |
16:18:38.29 |
+23:45:31.6 |
HIP 79914 |
2.86 |
| 2026-02-21 00:00 |
16:18:38.62 |
+23:46:15.6 |
HIP 79914 |
2.16 |
| 2026-02-21 12:00 |
16:18:38.91 |
+23:46:59.6 |
HIP 79914 |
1.49 |
| 2026-02-22 00:00 |
16:18:39.15 |
+23:47:43.8 |
HIP 79914 |
0.94 |
| 2026-02-22 12:00 |
16:18:39.36 |
+23:48:28.0 |
HIP 79914 |
0.81 |
| 2026-02-23 00:00 |
16:18:39.52 |
+23:49:12.4 |
HIP 79914 |
1.24 |
| 2026-02-23 12:00 |
16:18:39.64 |
+23:49:56.9 |
HIP 79914 |
1.88 |
| 2026-02-24 00:00 |
16:18:39.72 |
+23:50:41.4 |
HIP 79914 |
2.58 |