メタデータ
| 項目 |
値 |
| Designation |
C/2021 C1 (Rankin) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2020-12-07T02:38:59.493120Z |
| Orbit solution date (soln_date, UTC) |
2023-05-18T19:12:34Z |
| Obs used |
164 |
| NEO |
- |
| M1 |
11.100 |
| K1 |
11.250 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2021-02-11T10:37:59.865600Z |
| Discovery magnitude (MPC) |
19.74 G |
| Discovery observatory (MPC) |
G96 · University of Arizona Mt. Lemmon Survey |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2021-03-26.0000000 |
| e |
0.99961692 |
| q (au) |
3.481288 |
| a (au) |
9087.668673 |
| i (deg) |
143.038610 |
| Ω (om, deg) |
186.891902 |
| ω (w, deg) |
336.306876 |
| M (ma, deg) |
0.000124 |
等級
散乱 + 全体線形
$$
M_a = (12.324 + 4.761\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.324 |
| n |
4.761 |
| gf |
0.961 |
| gb |
-0.609 |
| 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) |
| 2026-06-01 00:00 |
05:31:29.16 |
+57:42:44.6 |
HIP 26147 |
25.46 |
| 2026-06-01 12:00 |
05:31:40.35 |
+57:42:31.9 |
HIP 26147 |
24.15 |
| 2026-06-02 00:00 |
05:31:51.55 |
+57:42:19.7 |
HIP 26147 |
22.85 |
| 2026-06-02 12:00 |
05:32:02.77 |
+57:42:07.9 |
HIP 26147 |
21.58 |
| 2026-06-03 00:00 |
05:32:14.01 |
+57:41:56.7 |
HIP 26147 |
20.33 |
| 2026-06-03 12:00 |
05:32:25.26 |
+57:41:45.9 |
HIP 26147 |
19.12 |
| 2026-06-04 00:00 |
05:32:36.53 |
+57:41:35.6 |
HIP 26147 |
17.94 |
| 2026-06-04 12:00 |
05:32:47.82 |
+57:41:25.8 |
HIP 26147 |
16.81 |
| 2026-06-05 00:00 |
05:32:59.11 |
+57:41:16.5 |
HIP 26147 |
15.73 |
| 2026-06-05 12:00 |
05:33:10.42 |
+57:41:07.6 |
HIP 26147 |
14.73 |
| 2026-06-06 00:00 |
05:33:21.74 |
+57:40:59.2 |
HIP 26147 |
13.82 |
| 2026-06-06 12:00 |
05:33:33.07 |
+57:40:51.3 |
HIP 26147 |
13.00 |
| 2026-06-07 00:00 |
05:33:44.42 |
+57:40:43.8 |
HIP 26147 |
12.32 |
| 2026-06-07 12:00 |
05:33:55.77 |
+57:40:36.8 |
HIP 26147 |
11.78 |
| 2026-06-08 00:00 |
05:34:07.13 |
+57:40:30.3 |
HIP 26147 |
11.42 |
| 2026-06-08 12:00 |
05:34:18.50 |
+57:40:24.3 |
HIP 26147 |
11.24 |
| 2026-06-09 00:00 |
05:34:29.88 |
+57:40:18.8 |
HIP 26147 |
11.25 |
| 2026-06-09 12:00 |
05:34:41.27 |
+57:40:13.7 |
HIP 26147 |
11.47 |
| 2026-06-10 00:00 |
05:34:52.66 |
+57:40:09.1 |
HIP 26147 |
11.86 |
| 2026-06-10 12:00 |
05:35:04.06 |
+57:40:05.0 |
HIP 26147 |
12.43 |
| 2026-06-11 00:00 |
05:35:15.46 |
+57:40:01.3 |
HIP 26147 |
13.14 |
| 2026-06-11 12:00 |
05:35:26.87 |
+57:39:58.1 |
HIP 26147 |
13.98 |
| 2026-06-12 00:00 |
05:35:38.28 |
+57:39:55.4 |
HIP 26147 |
14.91 |
| 2026-06-12 12:00 |
05:35:49.70 |
+57:39:53.2 |
HIP 26147 |
15.94 |
| 2026-06-13 00:00 |
05:36:01.11 |
+57:39:51.4 |
HIP 26147 |
17.03 |
| 2026-06-13 12:00 |
05:36:12.53 |
+57:39:50.2 |
HIP 26147 |
18.18 |
| 2026-06-14 00:00 |
05:36:23.94 |
+57:39:49.3 |
HIP 26147 |
19.38 |
| 2026-06-14 12:00 |
05:36:35.36 |
+57:39:49.0 |
HIP 26147 |
20.61 |
| 2026-06-15 00:00 |
05:36:46.78 |
+57:39:49.1 |
HIP 26147 |
21.88 |
| 2026-06-15 12:00 |
05:36:58.19 |
+57:39:49.7 |
HIP 26147 |
23.17 |
| 2026-06-16 00:00 |
05:37:09.60 |
+57:39:50.8 |
HIP 26147 |
24.49 |
| 2026-06-16 12:00 |
05:37:21.00 |
+57:39:52.3 |
HIP 26147 |
25.82 |
| 2026-06-17 00:00 |
05:37:32.41 |
+57:39:54.4 |
HIP 26147 |
27.17 |
| 2026-06-17 12:00 |
05:37:43.80 |
+57:39:56.8 |
HIP 26147 |
28.53 |
| 2026-06-18 00:00 |
05:37:55.19 |
+57:39:59.8 |
HIP 26793 |
29.11 |
| 2026-06-18 12:00 |
05:38:06.57 |
+57:40:03.2 |
HIP 26793 |
27.63 |
| 2026-06-19 00:00 |
05:38:17.95 |
+57:40:07.1 |
HIP 26793 |
26.15 |
| 2026-06-19 12:00 |
05:38:29.31 |
+57:40:11.4 |
HIP 26793 |
24.67 |
| 2026-06-20 00:00 |
05:38:40.67 |
+57:40:16.2 |
HIP 26793 |
23.20 |
| 2026-06-20 12:00 |
05:38:52.02 |
+57:40:21.5 |
HIP 26793 |
21.73 |
| 2026-06-21 00:00 |
05:39:03.35 |
+57:40:27.3 |
HIP 26793 |
20.28 |
| 2026-06-21 12:00 |
05:39:14.68 |
+57:40:33.5 |
HIP 26793 |
18.82 |
| 2026-06-22 00:00 |
05:39:25.99 |
+57:40:40.1 |
HIP 26793 |
17.38 |