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) |
| 2026-05-12 00:00 |
05:50:25.41 |
+14:10:28.5 |
HIP 27581 |
7.91 |
| 2026-05-12 12:00 |
05:50:26.36 |
+14:10:30.5 |
HIP 27581 |
7.86 |
| 2026-05-13 00:00 |
05:50:27.32 |
+14:10:32.4 |
HIP 27581 |
7.81 |
| 2026-05-13 12:00 |
05:50:28.28 |
+14:10:34.3 |
HIP 27581 |
7.77 |
| 2026-05-14 00:00 |
05:50:29.24 |
+14:10:36.3 |
HIP 27581 |
7.74 |
| 2026-05-14 12:00 |
05:50:30.22 |
+14:10:38.2 |
HIP 27581 |
7.71 |
| 2026-05-15 00:00 |
05:50:31.19 |
+14:10:40.0 |
HIP 27581 |
7.69 |
| 2026-05-15 12:00 |
05:50:32.18 |
+14:10:41.9 |
HIP 27581 |
7.68 |
| 2026-05-16 00:00 |
05:50:33.17 |
+14:10:43.7 |
HIP 27581 |
7.68 |
| 2026-05-16 12:00 |
05:50:34.16 |
+14:10:45.5 |
HIP 27581 |
7.69 |
| 2026-05-17 00:00 |
05:50:35.17 |
+14:10:47.3 |
HIP 27581 |
7.70 |
| 2026-05-17 12:00 |
05:50:36.17 |
+14:10:49.1 |
HIP 27581 |
7.73 |
| 2026-05-18 00:00 |
05:50:37.19 |
+14:10:50.9 |
HIP 27581 |
7.76 |
| 2026-05-18 12:00 |
05:50:38.20 |
+14:10:52.6 |
HIP 27581 |
7.80 |
| 2026-05-19 00:00 |
05:50:39.23 |
+14:10:54.3 |
HIP 27581 |
7.85 |
| 2026-05-19 12:00 |
05:50:40.25 |
+14:10:56.0 |
HIP 27581 |
7.90 |
| 2026-05-20 00:00 |
05:50:41.29 |
+14:10:57.7 |
HIP 27581 |
7.97 |
| 2026-05-20 12:00 |
05:50:42.33 |
+14:10:59.4 |
HIP 27581 |
8.04 |
| 2026-05-21 00:00 |
05:50:43.37 |
+14:11:01.0 |
HIP 27581 |
8.12 |
| 2026-05-21 12:00 |
05:50:44.42 |
+14:11:02.6 |
HIP 27581 |
8.21 |
| 2026-05-22 00:00 |
05:50:45.47 |
+14:11:04.2 |
HIP 27581 |
8.31 |
| 2026-05-22 12:00 |
05:50:46.53 |
+14:11:05.8 |
HIP 27618 |
8.30 |
| 2026-05-23 00:00 |
05:50:47.59 |
+14:11:07.3 |
HIP 27618 |
8.29 |
| 2026-05-23 12:00 |
05:50:48.65 |
+14:11:08.8 |
HIP 27618 |
8.29 |
| 2026-05-24 00:00 |
05:50:49.73 |
+14:11:10.3 |
HIP 27618 |
8.30 |
| 2026-05-24 12:00 |
05:50:50.80 |
+14:11:11.8 |
HIP 27618 |
8.32 |
| 2026-05-25 00:00 |
05:50:51.88 |
+14:11:13.3 |
HIP 27618 |
8.34 |
| 2026-05-25 12:00 |
05:50:52.96 |
+14:11:14.7 |
HIP 27618 |
8.37 |
| 2026-05-26 00:00 |
05:50:54.05 |
+14:11:16.2 |
HIP 27618 |
8.41 |
| 2026-05-26 12:00 |
05:50:55.14 |
+14:11:17.5 |
HIP 27618 |
8.46 |
| 2026-05-27 00:00 |
05:50:56.24 |
+14:11:18.9 |
HIP 27618 |
8.52 |
| 2026-05-27 12:00 |
05:50:57.34 |
+14:11:20.3 |
HIP 27618 |
8.58 |
| 2026-05-28 00:00 |
05:50:58.44 |
+14:11:21.6 |
HIP 27618 |
8.65 |
| 2026-05-28 12:00 |
05:50:59.55 |
+14:11:22.9 |
HIP 27618 |
8.73 |
| 2026-05-29 00:00 |
05:51:00.66 |
+14:11:24.2 |
HIP 27618 |
8.81 |
| 2026-05-29 12:00 |
05:51:01.77 |
+14:11:25.5 |
HIP 27618 |
8.91 |
| 2026-05-30 00:00 |
05:51:02.89 |
+14:11:26.7 |
HIP 27618 |
9.01 |
| 2026-05-30 12:00 |
05:51:04.01 |
+14:11:27.9 |
HIP 27618 |
9.11 |
| 2026-05-31 00:00 |
05:51:05.13 |
+14:11:29.1 |
HIP 27618 |
9.23 |
| 2026-05-31 12:00 |
05:51:06.26 |
+14:11:30.3 |
HIP 27618 |
9.35 |
| 2026-06-01 00:00 |
05:51:07.39 |
+14:11:31.5 |
HIP 27618 |
9.47 |
| 2026-06-01 12:00 |
05:51:08.52 |
+14:11:32.6 |
HIP 27618 |
9.61 |
| 2026-06-02 00:00 |
05:51:09.66 |
+14:11:33.7 |
HIP 27618 |
9.75 |