C/1951 G1 (Groeneveld)
メタデータ
| 項目 |
値 |
| Designation |
C/1951 G1 (Groeneveld) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1951-11-08T09:50:31.205760Z |
| Orbit solution date (soln_date, UTC) |
2023-04-24T19:06:50Z |
| Obs used |
9 |
| NEO |
- |
| M1 |
5.900 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
1951-04-02T04:09:59.040000Z |
| Discovery magnitude (MPC) |
15.00 T |
| Discovery observatory (MPC) |
711 · McDonald Observatory, Fort Davis |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1951-04-02.0000000 |
| e |
1.01297450 |
| q (au) |
3.625080 |
| a (au) |
-279.400392 |
| i (deg) |
18.650997 |
| Ω (om, deg) |
31.526922 |
| ω (w, deg) |
188.119857 |
| M (ma, deg) |
-0.046515 |
等級
散乱 + 全体線形
$$
M_a = (12.778 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.778 |
| n |
2.000 |
| gf |
0.841 |
| gb |
-0.923 |
| k |
0.965 |
| δ90 |
1.000 |
| 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 |
01:06:57.99 |
+01:47:15.4 |
HIP 5163 |
14.09 |
| 2026-02-03 12:00 |
01:06:58.49 |
+01:47:20.2 |
HIP 5163 |
14.23 |
| 2026-02-04 00:00 |
01:06:59.01 |
+01:47:25.0 |
HIP 5163 |
14.38 |
| 2026-02-04 12:00 |
01:06:59.53 |
+01:47:29.9 |
HIP 5163 |
14.53 |
| 2026-02-05 00:00 |
01:07:00.06 |
+01:47:34.8 |
HIP 5163 |
14.68 |
| 2026-02-05 12:00 |
01:07:00.60 |
+01:47:39.8 |
HIP 5163 |
14.84 |
| 2026-02-06 00:00 |
01:07:01.14 |
+01:47:44.8 |
HIP 5163 |
15.00 |
| 2026-02-06 12:00 |
01:07:01.70 |
+01:47:49.8 |
HIP 5163 |
15.16 |
| 2026-02-07 00:00 |
01:07:02.26 |
+01:47:54.9 |
HIP 5163 |
15.32 |
| 2026-02-07 12:00 |
01:07:02.83 |
+01:48:00.0 |
HIP 5163 |
15.48 |
| 2026-02-08 00:00 |
01:07:03.41 |
+01:48:05.2 |
HIP 5163 |
15.65 |
| 2026-02-08 12:00 |
01:07:04.00 |
+01:48:10.4 |
HIP 5163 |
15.82 |
| 2026-02-09 00:00 |
01:07:04.60 |
+01:48:15.7 |
HIP 5163 |
15.99 |
| 2026-02-09 12:00 |
01:07:05.20 |
+01:48:21.0 |
HIP 5163 |
16.16 |
| 2026-02-10 00:00 |
01:07:05.81 |
+01:48:26.4 |
HIP 5163 |
16.34 |
| 2026-02-10 12:00 |
01:07:06.44 |
+01:48:31.7 |
HIP 5163 |
16.51 |
| 2026-02-11 00:00 |
01:07:07.06 |
+01:48:37.2 |
HIP 5163 |
16.69 |
| 2026-02-11 12:00 |
01:07:07.70 |
+01:48:42.6 |
HIP 5163 |
16.87 |
| 2026-02-12 00:00 |
01:07:08.35 |
+01:48:48.2 |
HIP 5315 |
16.78 |
| 2026-02-12 12:00 |
01:07:09.00 |
+01:48:53.7 |
HIP 5315 |
16.59 |
| 2026-02-13 00:00 |
01:07:09.66 |
+01:48:59.3 |
HIP 5315 |
16.41 |
| 2026-02-13 12:00 |
01:07:10.33 |
+01:49:04.9 |
HIP 5315 |
16.22 |
| 2026-02-14 00:00 |
01:07:11.00 |
+01:49:10.6 |
HIP 5315 |
16.03 |
| 2026-02-14 12:00 |
01:07:11.69 |
+01:49:16.3 |
HIP 5315 |
15.84 |
| 2026-02-15 00:00 |
01:07:12.38 |
+01:49:22.1 |
HIP 5315 |
15.64 |
| 2026-02-15 12:00 |
01:07:13.08 |
+01:49:27.8 |
HIP 5315 |
15.45 |
| 2026-02-16 00:00 |
01:07:13.78 |
+01:49:33.7 |
HIP 5315 |
15.25 |
| 2026-02-16 12:00 |
01:07:14.50 |
+01:49:39.5 |
HIP 5315 |
15.05 |
| 2026-02-17 00:00 |
01:07:15.22 |
+01:49:45.4 |
HIP 5315 |
14.85 |
| 2026-02-17 12:00 |
01:07:15.95 |
+01:49:51.3 |
HIP 5315 |
14.65 |
| 2026-02-18 00:00 |
01:07:16.68 |
+01:49:57.3 |
HIP 5315 |
14.45 |
| 2026-02-18 12:00 |
01:07:17.43 |
+01:50:03.3 |
HIP 5315 |
14.24 |
| 2026-02-19 00:00 |
01:07:18.18 |
+01:50:09.3 |
HIP 5315 |
14.04 |
| 2026-02-19 12:00 |
01:07:18.93 |
+01:50:15.4 |
HIP 5315 |
13.83 |
| 2026-02-20 00:00 |
01:07:19.70 |
+01:50:21.5 |
HIP 5315 |
13.62 |
| 2026-02-20 12:00 |
01:07:20.47 |
+01:50:27.6 |
HIP 5315 |
13.41 |
| 2026-02-21 00:00 |
01:07:21.25 |
+01:50:33.8 |
HIP 5315 |
13.20 |
| 2026-02-21 12:00 |
01:07:22.03 |
+01:50:40.0 |
HIP 5315 |
12.99 |
| 2026-02-22 00:00 |
01:07:22.83 |
+01:50:46.2 |
HIP 5315 |
12.77 |
| 2026-02-22 12:00 |
01:07:23.63 |
+01:50:52.5 |
HIP 5315 |
12.56 |
| 2026-02-23 00:00 |
01:07:24.43 |
+01:50:58.8 |
HIP 5315 |
12.34 |
| 2026-02-23 12:00 |
01:07:25.24 |
+01:51:05.1 |
HIP 5315 |
12.12 |
| 2026-02-24 00:00 |
01:07:26.06 |
+01:51:11.5 |
HIP 5315 |
11.90 |