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) |
| 2026-09-20 00:00 |
05:58:26.77 |
+59:47:28.8 |
HIP 28468 |
17.28 |
| 2026-09-20 12:00 |
05:58:24.32 |
+59:48:35.4 |
HIP 28468 |
17.25 |
| 2026-09-21 00:00 |
05:58:21.73 |
+59:49:42.0 |
HIP 28468 |
17.30 |
| 2026-09-21 12:00 |
05:58:19.01 |
+59:50:48.7 |
HIP 28468 |
17.45 |
| 2026-09-22 00:00 |
05:58:16.15 |
+59:51:55.5 |
HIP 28468 |
17.69 |
| 2026-09-22 12:00 |
05:58:13.16 |
+59:53:02.2 |
HIP 28468 |
18.02 |
| 2026-09-23 00:00 |
05:58:10.03 |
+59:54:09.1 |
HIP 28468 |
18.44 |
| 2026-09-23 12:00 |
05:58:06.76 |
+59:55:15.9 |
HIP 28468 |
18.94 |
| 2026-09-24 00:00 |
05:58:03.36 |
+59:56:22.7 |
HIP 28468 |
19.51 |
| 2026-09-24 12:00 |
05:57:59.82 |
+59:57:29.6 |
HIP 28468 |
20.16 |
| 2026-09-25 00:00 |
05:57:56.15 |
+59:58:36.5 |
HIP 28468 |
20.86 |
| 2026-09-25 12:00 |
05:57:52.34 |
+59:59:43.4 |
HIP 28468 |
21.63 |
| 2026-09-26 00:00 |
05:57:48.39 |
+60:00:50.3 |
HIP 28468 |
22.46 |
| 2026-09-26 12:00 |
05:57:44.30 |
+60:01:57.2 |
HIP 28293 |
22.23 |
| 2026-09-27 00:00 |
05:57:40.08 |
+60:03:04.0 |
HIP 28293 |
21.38 |
| 2026-09-27 12:00 |
05:57:35.71 |
+60:04:10.9 |
HIP 28293 |
20.58 |
| 2026-09-28 00:00 |
05:57:31.21 |
+60:05:17.7 |
HIP 28293 |
19.84 |
| 2026-09-28 12:00 |
05:57:26.57 |
+60:06:24.5 |
HIP 28293 |
19.15 |
| 2026-09-29 00:00 |
05:57:21.79 |
+60:07:31.3 |
HIP 28293 |
18.53 |
| 2026-09-29 12:00 |
05:57:16.87 |
+60:08:38.0 |
HIP 28293 |
18.00 |
| 2026-09-30 00:00 |
05:57:11.81 |
+60:09:44.7 |
HIP 28293 |
17.54 |
| 2026-09-30 12:00 |
05:57:06.61 |
+60:10:51.4 |
HIP 28293 |
17.19 |
| 2026-10-01 00:00 |
05:57:01.27 |
+60:11:58.0 |
HIP 28293 |
16.94 |
| 2026-10-01 12:00 |
05:56:55.79 |
+60:13:04.5 |
HIP 28293 |
16.79 |
| 2026-10-02 00:00 |
05:56:50.16 |
+60:14:10.9 |
HIP 28293 |
16.77 |
| 2026-10-02 12:00 |
05:56:44.40 |
+60:15:17.3 |
HIP 28293 |
16.86 |
| 2026-10-03 00:00 |
05:56:38.50 |
+60:16:23.6 |
HIP 28293 |
17.07 |
| 2026-10-03 12:00 |
05:56:32.45 |
+60:17:29.8 |
HIP 28293 |
17.39 |
| 2026-10-04 00:00 |
05:56:26.26 |
+60:18:35.9 |
HIP 28293 |
17.82 |
| 2026-10-04 12:00 |
05:56:19.93 |
+60:19:41.9 |
HIP 28293 |
18.36 |
| 2026-10-05 00:00 |
05:56:13.45 |
+60:20:47.8 |
HIP 28293 |
19.00 |
| 2026-10-05 12:00 |
05:56:06.83 |
+60:21:53.6 |
HIP 28293 |
19.73 |
| 2026-10-06 00:00 |
05:56:00.07 |
+60:22:59.2 |
HIP 28293 |
20.54 |
| 2026-10-06 12:00 |
05:55:53.17 |
+60:24:04.8 |
HIP 28293 |
21.42 |
| 2026-10-07 00:00 |
05:55:46.12 |
+60:25:10.2 |
HIP 28293 |
22.37 |
| 2026-10-07 12:00 |
05:55:38.93 |
+60:26:15.4 |
HIP 28293 |
23.38 |
| 2026-10-08 00:00 |
05:55:31.60 |
+60:27:20.5 |
HIP 28293 |
24.45 |
| 2026-10-08 12:00 |
05:55:24.12 |
+60:28:25.5 |
HIP 28293 |
25.57 |
| 2026-10-09 00:00 |
05:55:16.50 |
+60:29:30.3 |
HIP 28293 |
26.73 |
| 2026-10-09 12:00 |
05:55:08.73 |
+60:30:34.9 |
HIP 28293 |
27.93 |
| 2026-10-10 00:00 |
05:55:00.82 |
+60:31:39.3 |
HIP 28293 |
29.17 |
| 2026-10-10 12:00 |
05:54:52.77 |
+60:32:43.6 |
HIP 28293 |
30.44 |
| 2026-10-11 00:00 |
05:54:44.58 |
+60:33:47.6 |
HIP 27888 |
31.46 |