メタデータ
| 項目 |
値 |
| Designation |
C/1915 C1 (Mellish) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1915-07-17T15:36:50.613120Z |
| Orbit solution date (soln_date, UTC) |
2024-04-15T15:43:28Z |
| Obs used |
94 |
| NEO |
- |
| M1 |
7.700 |
| 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) |
1915-06-30.0000000 |
| e |
1.00027442 |
| q (au) |
1.005324 |
| a (au) |
-3663.395604 |
| i (deg) |
54.791644 |
| Ω (om, deg) |
73.453125 |
| ω (w, deg) |
247.782134 |
| M (ma, deg) |
-0.000078 |
等級
散乱 + 全体線形
$$
M_a = (9.514 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.514 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.852 |
| 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) |
| 2026-03-26 00:00 |
08:54:17.59 |
+63:31:03.0 |
HIP 43793 |
6.43 |
| 2026-03-26 12:00 |
08:54:16.40 |
+63:30:56.6 |
HIP 43793 |
6.50 |
| 2026-03-27 00:00 |
08:54:15.23 |
+63:30:50.0 |
HIP 43793 |
6.57 |
| 2026-03-27 12:00 |
08:54:14.08 |
+63:30:43.4 |
HIP 43793 |
6.65 |
| 2026-03-28 00:00 |
08:54:12.94 |
+63:30:36.8 |
HIP 43793 |
6.72 |
| 2026-03-28 12:00 |
08:54:11.81 |
+63:30:30.0 |
HIP 43793 |
6.80 |
| 2026-03-29 00:00 |
08:54:10.70 |
+63:30:23.2 |
HIP 43793 |
6.88 |
| 2026-03-29 12:00 |
08:54:09.60 |
+63:30:16.4 |
HIP 43793 |
6.96 |
| 2026-03-30 00:00 |
08:54:08.52 |
+63:30:09.4 |
HIP 43793 |
7.04 |
| 2026-03-30 12:00 |
08:54:07.45 |
+63:30:02.4 |
HIP 43793 |
7.12 |
| 2026-03-31 00:00 |
08:54:06.40 |
+63:29:55.4 |
HIP 43793 |
7.20 |
| 2026-03-31 12:00 |
08:54:05.37 |
+63:29:48.2 |
HIP 43793 |
7.28 |
| 2026-04-01 00:00 |
08:54:04.35 |
+63:29:41.0 |
HIP 43793 |
7.37 |
| 2026-04-01 12:00 |
08:54:03.34 |
+63:29:33.8 |
HIP 43793 |
7.46 |
| 2026-04-02 00:00 |
08:54:02.35 |
+63:29:26.5 |
HIP 43793 |
7.54 |
| 2026-04-02 12:00 |
08:54:01.37 |
+63:29:19.1 |
HIP 43793 |
7.63 |
| 2026-04-03 00:00 |
08:54:00.41 |
+63:29:11.7 |
HIP 43793 |
7.72 |
| 2026-04-03 12:00 |
08:53:59.47 |
+63:29:04.2 |
HIP 43793 |
7.81 |
| 2026-04-04 00:00 |
08:53:58.54 |
+63:28:56.6 |
HIP 43793 |
7.89 |
| 2026-04-04 12:00 |
08:53:57.62 |
+63:28:49.0 |
HIP 43793 |
7.98 |
| 2026-04-05 00:00 |
08:53:56.72 |
+63:28:41.3 |
HIP 43793 |
8.07 |
| 2026-04-05 12:00 |
08:53:55.84 |
+63:28:33.6 |
HIP 43793 |
8.16 |
| 2026-04-06 00:00 |
08:53:54.97 |
+63:28:25.8 |
HIP 43793 |
8.26 |
| 2026-04-06 12:00 |
08:53:54.12 |
+63:28:17.9 |
HIP 43793 |
8.35 |
| 2026-04-07 00:00 |
08:53:53.29 |
+63:28:10.0 |
HIP 43793 |
8.44 |
| 2026-04-07 12:00 |
08:53:52.47 |
+63:28:02.1 |
HIP 43793 |
8.53 |
| 2026-04-08 00:00 |
08:53:51.66 |
+63:27:54.0 |
HIP 43793 |
8.62 |
| 2026-04-08 12:00 |
08:53:50.88 |
+63:27:46.0 |
HIP 43793 |
8.72 |
| 2026-04-09 00:00 |
08:53:50.10 |
+63:27:37.8 |
HIP 43793 |
8.81 |
| 2026-04-09 12:00 |
08:53:49.35 |
+63:27:29.7 |
HIP 43793 |
8.90 |
| 2026-04-10 00:00 |
08:53:48.61 |
+63:27:21.4 |
HIP 43793 |
9.00 |
| 2026-04-10 12:00 |
08:53:47.89 |
+63:27:13.2 |
HIP 43793 |
9.09 |
| 2026-04-11 00:00 |
08:53:47.18 |
+63:27:04.8 |
HIP 43793 |
9.18 |
| 2026-04-11 12:00 |
08:53:46.49 |
+63:26:56.4 |
HIP 43793 |
9.28 |
| 2026-04-12 00:00 |
08:53:45.81 |
+63:26:48.0 |
HIP 43793 |
9.37 |
| 2026-04-12 12:00 |
08:53:45.15 |
+63:26:39.5 |
HIP 43793 |
9.46 |
| 2026-04-13 00:00 |
08:53:44.51 |
+63:26:31.0 |
HIP 43793 |
9.56 |
| 2026-04-13 12:00 |
08:53:43.89 |
+63:26:22.4 |
HIP 43793 |
9.65 |
| 2026-04-14 00:00 |
08:53:43.28 |
+63:26:13.8 |
HIP 43793 |
9.75 |
| 2026-04-14 12:00 |
08:53:42.69 |
+63:26:05.1 |
HIP 43793 |
9.84 |
| 2026-04-15 00:00 |
08:53:42.11 |
+63:25:56.4 |
HIP 43793 |
9.93 |
| 2026-04-15 12:00 |
08:53:41.55 |
+63:25:47.6 |
HIP 43793 |
10.03 |
| 2026-04-16 00:00 |
08:53:41.01 |
+63:25:38.8 |
HIP 43793 |
10.12 |