C/1951 G2 (Groeneveld-Palomar)
メタデータ
| 項目 |
値 |
| Designation |
C/1951 G2 (Groeneveld-Palomar) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1950-07-11T23:45:37.175040Z |
| Orbit solution date (soln_date, UTC) |
2023-07-24T16:29:21Z |
| Obs used |
9 |
| NEO |
- |
| M1 |
5.900 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
1951-04-09T05:11:02.400000Z |
| Discovery magnitude (MPC) |
14.50 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) |
1951-04-14.0000000 |
| e |
1.00090094 |
| q (au) |
3.638504 |
| a (au) |
-4038.551574 |
| i (deg) |
170.654005 |
| Ω (om, deg) |
354.318294 |
| ω (w, deg) |
108.662689 |
| M (ma, deg) |
0.001060 |
等級
散乱 + 全体線形
$$
M_a = (4.160 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
4.160 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.566 |
| 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 |
05:50:16.85 |
+14:01:53.0 |
HIP 27618 |
8.44 |
| 2026-02-03 12:00 |
05:50:15.92 |
+14:01:54.9 |
HIP 27618 |
8.66 |
| 2026-02-04 00:00 |
05:50:14.99 |
+14:01:56.9 |
HIP 27618 |
8.88 |
| 2026-02-04 12:00 |
05:50:14.08 |
+14:01:58.9 |
HIP 27618 |
9.09 |
| 2026-02-05 00:00 |
05:50:13.17 |
+14:02:00.9 |
HIP 27618 |
9.31 |
| 2026-02-05 12:00 |
05:50:12.27 |
+14:02:03.0 |
HIP 27618 |
9.52 |
| 2026-02-06 00:00 |
05:50:11.38 |
+14:02:05.0 |
HIP 27618 |
9.73 |
| 2026-02-06 12:00 |
05:50:10.50 |
+14:02:07.1 |
HIP 27618 |
9.94 |
| 2026-02-07 00:00 |
05:50:09.63 |
+14:02:09.2 |
HIP 27618 |
10.15 |
| 2026-02-07 12:00 |
05:50:08.77 |
+14:02:11.3 |
HIP 27618 |
10.36 |
| 2026-02-08 00:00 |
05:50:07.91 |
+14:02:13.5 |
HIP 27618 |
10.56 |
| 2026-02-08 12:00 |
05:50:07.07 |
+14:02:15.6 |
HIP 27618 |
10.77 |
| 2026-02-09 00:00 |
05:50:06.23 |
+14:02:17.8 |
HIP 27618 |
10.97 |
| 2026-02-09 12:00 |
05:50:05.40 |
+14:02:20.0 |
HIP 27618 |
11.17 |
| 2026-02-10 00:00 |
05:50:04.58 |
+14:02:22.2 |
HIP 27618 |
11.36 |
| 2026-02-10 12:00 |
05:50:03.77 |
+14:02:24.4 |
HIP 27618 |
11.56 |
| 2026-02-11 00:00 |
05:50:02.97 |
+14:02:26.7 |
HIP 27504 |
11.52 |
| 2026-02-11 12:00 |
05:50:02.18 |
+14:02:28.9 |
HIP 27504 |
11.39 |
| 2026-02-12 00:00 |
05:50:01.40 |
+14:02:31.2 |
HIP 27504 |
11.27 |
| 2026-02-12 12:00 |
05:50:00.62 |
+14:02:33.5 |
HIP 27504 |
11.15 |
| 2026-02-13 00:00 |
05:49:59.86 |
+14:02:35.8 |
HIP 27504 |
11.04 |
| 2026-02-13 12:00 |
05:49:59.11 |
+14:02:38.1 |
HIP 27504 |
10.93 |
| 2026-02-14 00:00 |
05:49:58.36 |
+14:02:40.5 |
HIP 27504 |
10.82 |
| 2026-02-14 12:00 |
05:49:57.63 |
+14:02:42.8 |
HIP 27504 |
10.72 |
| 2026-02-15 00:00 |
05:49:56.90 |
+14:02:45.2 |
HIP 27504 |
10.62 |
| 2026-02-15 12:00 |
05:49:56.18 |
+14:02:47.6 |
HIP 27504 |
10.52 |
| 2026-02-16 00:00 |
05:49:55.48 |
+14:02:50.0 |
HIP 27504 |
10.43 |
| 2026-02-16 12:00 |
05:49:54.78 |
+14:02:52.4 |
HIP 27504 |
10.35 |
| 2026-02-17 00:00 |
05:49:54.09 |
+14:02:54.9 |
HIP 27504 |
10.26 |
| 2026-02-17 12:00 |
05:49:53.42 |
+14:02:57.3 |
HIP 27504 |
10.18 |
| 2026-02-18 00:00 |
05:49:52.75 |
+14:02:59.8 |
HIP 27504 |
10.11 |
| 2026-02-18 12:00 |
05:49:52.09 |
+14:03:02.3 |
HIP 27504 |
10.04 |
| 2026-02-19 00:00 |
05:49:51.45 |
+14:03:04.8 |
HIP 27504 |
9.97 |
| 2026-02-19 12:00 |
05:49:50.81 |
+14:03:07.3 |
HIP 27504 |
9.91 |
| 2026-02-20 00:00 |
05:49:50.18 |
+14:03:09.8 |
HIP 27504 |
9.85 |
| 2026-02-20 12:00 |
05:49:49.56 |
+14:03:12.4 |
HIP 27504 |
9.79 |
| 2026-02-21 00:00 |
05:49:48.96 |
+14:03:14.9 |
HIP 27504 |
9.74 |
| 2026-02-21 12:00 |
05:49:48.36 |
+14:03:17.5 |
HIP 27504 |
9.69 |
| 2026-02-22 00:00 |
05:49:47.78 |
+14:03:20.1 |
HIP 27504 |
9.65 |
| 2026-02-22 12:00 |
05:49:47.20 |
+14:03:22.6 |
HIP 27504 |
9.61 |
| 2026-02-23 00:00 |
05:49:46.63 |
+14:03:25.3 |
HIP 27504 |
9.57 |
| 2026-02-23 12:00 |
05:49:46.08 |
+14:03:27.9 |
HIP 27504 |
9.54 |
| 2026-02-24 00:00 |
05:49:45.53 |
+14:03:30.5 |
HIP 27504 |
9.51 |