メタデータ
| 項目 |
値 |
| Designation |
C/1940 R2 (Cunningham) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1941-01-16T05:36:57.600000Z |
| Orbit solution date (soln_date, UTC) |
- |
| Obs used |
189 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1941-01-06.0000000 |
| e |
1.00048500 |
| q (au) |
0.367751 |
| a (au) |
-758.249484 |
| i (deg) |
49.894200 |
| Ω (om, deg) |
296.590500 |
| ω (w, deg) |
199.569000 |
| M (ma, deg) |
-0.000483 |
等級
散乱 + 全体線形
$$
M_a = (5.846 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
5.846 |
| n |
2.000 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
1.000 |
| 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) |
| 2026-03-26 00:00 |
20:21:25.11 |
-09:35:04.9 |
HIP 100524 |
23.95 |
| 2026-03-26 12:00 |
20:21:25.62 |
-09:35:00.6 |
HIP 100524 |
23.84 |
| 2026-03-27 00:00 |
20:21:26.12 |
-09:34:56.4 |
HIP 100524 |
23.73 |
| 2026-03-27 12:00 |
20:21:26.61 |
-09:34:52.1 |
HIP 100524 |
23.63 |
| 2026-03-28 00:00 |
20:21:27.10 |
-09:34:47.9 |
HIP 100524 |
23.52 |
| 2026-03-28 12:00 |
20:21:27.58 |
-09:34:43.7 |
HIP 100524 |
23.42 |
| 2026-03-29 00:00 |
20:21:28.05 |
-09:34:39.5 |
HIP 100524 |
23.32 |
| 2026-03-29 12:00 |
20:21:28.51 |
-09:34:35.3 |
HIP 100524 |
23.22 |
| 2026-03-30 00:00 |
20:21:28.96 |
-09:34:31.2 |
HIP 100524 |
23.13 |
| 2026-03-30 12:00 |
20:21:29.41 |
-09:34:27.1 |
HIP 100524 |
23.03 |
| 2026-03-31 00:00 |
20:21:29.84 |
-09:34:22.9 |
HIP 100524 |
22.94 |
| 2026-03-31 12:00 |
20:21:30.27 |
-09:34:18.8 |
HIP 100524 |
22.85 |
| 2026-04-01 00:00 |
20:21:30.69 |
-09:34:14.8 |
HIP 100524 |
22.77 |
| 2026-04-01 12:00 |
20:21:31.11 |
-09:34:10.7 |
HIP 100524 |
22.68 |
| 2026-04-02 00:00 |
20:21:31.51 |
-09:34:06.7 |
HIP 100524 |
22.60 |
| 2026-04-02 12:00 |
20:21:31.90 |
-09:34:02.7 |
HIP 100524 |
22.52 |
| 2026-04-03 00:00 |
20:21:32.29 |
-09:33:58.7 |
HIP 100524 |
22.45 |
| 2026-04-03 12:00 |
20:21:32.67 |
-09:33:54.7 |
HIP 100524 |
22.37 |
| 2026-04-04 00:00 |
20:21:33.04 |
-09:33:50.7 |
HIP 100524 |
22.30 |
| 2026-04-04 12:00 |
20:21:33.40 |
-09:33:46.8 |
HIP 100524 |
22.23 |
| 2026-04-05 00:00 |
20:21:33.75 |
-09:33:42.9 |
HIP 100524 |
22.16 |
| 2026-04-05 12:00 |
20:21:34.10 |
-09:33:39.0 |
HIP 100524 |
22.09 |
| 2026-04-06 00:00 |
20:21:34.43 |
-09:33:35.1 |
HIP 100524 |
22.03 |
| 2026-04-06 12:00 |
20:21:34.76 |
-09:33:31.3 |
HIP 100524 |
21.97 |
| 2026-04-07 00:00 |
20:21:35.08 |
-09:33:27.5 |
HIP 100524 |
21.91 |
| 2026-04-07 12:00 |
20:21:35.39 |
-09:33:23.7 |
HIP 100524 |
21.85 |
| 2026-04-08 00:00 |
20:21:35.69 |
-09:33:19.9 |
HIP 100524 |
21.80 |
| 2026-04-08 12:00 |
20:21:35.99 |
-09:33:16.1 |
HIP 100524 |
21.75 |
| 2026-04-09 00:00 |
20:21:36.27 |
-09:33:12.4 |
HIP 100524 |
21.70 |
| 2026-04-09 12:00 |
20:21:36.55 |
-09:33:08.7 |
HIP 100524 |
21.65 |
| 2026-04-10 00:00 |
20:21:36.81 |
-09:33:05.0 |
HIP 100524 |
21.60 |
| 2026-04-10 12:00 |
20:21:37.07 |
-09:33:01.3 |
HIP 100524 |
21.56 |
| 2026-04-11 00:00 |
20:21:37.32 |
-09:32:57.7 |
HIP 100524 |
21.52 |
| 2026-04-11 12:00 |
20:21:37.56 |
-09:32:54.1 |
HIP 100524 |
21.48 |
| 2026-04-12 00:00 |
20:21:37.79 |
-09:32:50.5 |
HIP 100524 |
21.44 |
| 2026-04-12 12:00 |
20:21:38.01 |
-09:32:46.9 |
HIP 100524 |
21.41 |
| 2026-04-13 00:00 |
20:21:38.23 |
-09:32:43.4 |
HIP 100524 |
21.38 |
| 2026-04-13 12:00 |
20:21:38.43 |
-09:32:39.9 |
HIP 100524 |
21.35 |
| 2026-04-14 00:00 |
20:21:38.63 |
-09:32:36.4 |
HIP 100524 |
21.32 |
| 2026-04-14 12:00 |
20:21:38.82 |
-09:32:33.0 |
HIP 100524 |
21.29 |
| 2026-04-15 00:00 |
20:21:38.99 |
-09:32:29.5 |
HIP 100524 |
21.27 |
| 2026-04-15 12:00 |
20:21:39.16 |
-09:32:26.1 |
HIP 100524 |
21.25 |
| 2026-04-16 00:00 |
20:21:39.32 |
-09:32:22.7 |
HIP 100524 |
21.23 |