メタデータ
| 項目 |
値 |
| Designation |
C/2021 V1 (Rankin) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2022-04-30T08:37:20.375040Z |
| Orbit solution date (soln_date, UTC) |
2022-02-14T01:12:42Z |
| Obs used |
67 |
| NEO |
- |
| M1 |
15.900 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2021-11-05T03:51:31.478400Z |
| Discovery magnitude (MPC) |
20.97 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) |
2021-11-16.0000000 |
| e |
0.99556441 |
| q (au) |
3.013528 |
| a (au) |
679.397411 |
| i (deg) |
71.440704 |
| Ω (om, deg) |
207.653208 |
| ω (w, deg) |
195.103041 |
| M (ma, deg) |
359.990797 |
等級
散乱 + 全体線形
$$
M_a = (14.742 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.742 |
| n |
2.000 |
| gf |
0.999 |
| gb |
-0.811 |
| k |
1.000 |
| 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 |
11:25:42.03 |
-37:47:30.3 |
HIP 55763 |
3.18 |
| 2026-09-20 12:00 |
11:25:53.87 |
-37:48:07.2 |
HIP 55763 |
5.24 |
| 2026-09-21 00:00 |
11:26:05.69 |
-37:48:44.8 |
HIP 55763 |
7.52 |
| 2026-09-21 12:00 |
11:26:17.50 |
-37:49:23.0 |
HIP 55763 |
9.87 |
| 2026-09-22 00:00 |
11:26:29.29 |
-37:50:01.7 |
HIP 55763 |
12.24 |
| 2026-09-22 12:00 |
11:26:41.06 |
-37:50:41.1 |
HIP 55763 |
14.63 |
| 2026-09-23 00:00 |
11:26:52.82 |
-37:51:21.0 |
HIP 55763 |
17.03 |
| 2026-09-23 12:00 |
11:27:04.56 |
-37:52:01.6 |
HIP 55841 |
18.00 |
| 2026-09-24 00:00 |
11:27:16.29 |
-37:52:42.7 |
HIP 55841 |
18.06 |
| 2026-09-24 12:00 |
11:27:27.99 |
-37:53:24.4 |
HIP 55841 |
18.42 |
| 2026-09-25 00:00 |
11:27:39.68 |
-37:54:06.6 |
HIP 55841 |
19.08 |
| 2026-09-25 12:00 |
11:27:51.35 |
-37:54:49.4 |
HIP 55841 |
19.99 |
| 2026-09-26 00:00 |
11:28:03.00 |
-37:55:32.8 |
HIP 55841 |
21.13 |
| 2026-09-26 12:00 |
11:28:14.62 |
-37:56:16.8 |
HIP 55841 |
22.46 |
| 2026-09-27 00:00 |
11:28:26.23 |
-37:57:01.3 |
HIP 55841 |
23.95 |
| 2026-09-27 12:00 |
11:28:37.82 |
-37:57:46.4 |
HIP 55841 |
25.57 |
| 2026-09-28 00:00 |
11:28:49.39 |
-37:58:32.0 |
HIP 55841 |
27.30 |
| 2026-09-28 12:00 |
11:29:00.93 |
-37:59:18.1 |
HIP 56189 |
28.01 |
| 2026-09-29 00:00 |
11:29:12.46 |
-38:00:04.9 |
HIP 56189 |
26.51 |
| 2026-09-29 12:00 |
11:29:23.96 |
-38:00:52.1 |
HIP 56189 |
25.17 |
| 2026-09-30 00:00 |
11:29:35.44 |
-38:01:39.9 |
HIP 56189 |
24.01 |
| 2026-09-30 12:00 |
11:29:46.89 |
-38:02:28.3 |
HIP 56189 |
23.05 |
| 2026-10-01 00:00 |
11:29:58.32 |
-38:03:17.2 |
HIP 56189 |
22.32 |
| 2026-10-01 12:00 |
11:30:09.73 |
-38:04:06.6 |
HIP 56189 |
21.83 |
| 2026-10-02 00:00 |
11:30:21.11 |
-38:04:56.5 |
HIP 56189 |
21.62 |
| 2026-10-02 12:00 |
11:30:32.46 |
-38:05:47.0 |
HIP 56189 |
21.68 |
| 2026-10-03 00:00 |
11:30:43.79 |
-38:06:37.9 |
HIP 56189 |
22.01 |
| 2026-10-03 12:00 |
11:30:55.10 |
-38:07:29.5 |
HIP 56189 |
22.59 |
| 2026-10-04 00:00 |
11:31:06.37 |
-38:08:21.5 |
HIP 56189 |
23.42 |
| 2026-10-04 12:00 |
11:31:17.62 |
-38:09:14.0 |
HIP 56189 |
24.46 |
| 2026-10-05 00:00 |
11:31:28.84 |
-38:10:07.1 |
HIP 56189 |
25.69 |
| 2026-10-05 12:00 |
11:31:40.03 |
-38:11:00.6 |
HIP 56189 |
27.08 |
| 2026-10-06 00:00 |
11:31:51.20 |
-38:11:54.6 |
HIP 56189 |
28.60 |
| 2026-10-06 12:00 |
11:32:02.33 |
-38:12:49.2 |
HIP 56189 |
30.24 |
| 2026-10-07 00:00 |
11:32:13.43 |
-38:13:44.2 |
HIP 56189 |
31.98 |
| 2026-10-07 12:00 |
11:32:24.50 |
-38:14:39.8 |
HIP 56189 |
33.80 |
| 2026-10-08 00:00 |
11:32:35.55 |
-38:15:35.8 |
HIP 56189 |
35.68 |
| 2026-10-08 12:00 |
11:32:46.55 |
-38:16:32.3 |
HIP 56189 |
37.63 |
| 2026-10-09 00:00 |
11:32:57.53 |
-38:17:29.3 |
HIP 56081 |
39.56 |
| 2026-10-09 12:00 |
11:33:08.47 |
-38:18:26.7 |
HIP 56525 |
39.70 |
| 2026-10-10 00:00 |
11:33:19.38 |
-38:19:24.6 |
HIP 56525 |
37.58 |
| 2026-10-10 12:00 |
11:33:30.26 |
-38:20:23.0 |
HIP 56525 |
35.48 |
| 2026-10-11 00:00 |
11:33:41.10 |
-38:21:21.9 |
HIP 56525 |
33.41 |