メタデータ
| 項目 |
値 |
| Designation |
C/2025 V2 (Rankin) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2027-03-22T23:07:07.374720Z |
| Orbit solution date (soln_date, UTC) |
2026-05-08T13:42:11Z |
| Obs used |
489 |
| NEO |
- |
| M1 |
9.000 |
| K1 |
9.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2025-11-02T11:21:58.089600Z |
| Discovery magnitude (MPC) |
19.86 G |
| Discovery observatory (MPC) |
G96 · Mt. Lemmon Survey |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2026-01-24.0000000 |
| e |
1.00070916 |
| q (au) |
1.952666 |
| a (au) |
-2753.488013 |
| i (deg) |
37.281262 |
| Ω (om, deg) |
138.082133 |
| ω (w, deg) |
102.706874 |
| M (ma, deg) |
-0.002885 |
等級
散乱 + 全体線形
$$
M_a = (8.604 + 3.874\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
8.604 |
| n |
3.874 |
| gf |
0.964 |
| gb |
-0.951 |
| 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
ファインディングチャート
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
09:06:49.86 |
+23:17:36.5 |
HIP 44740 |
3.57 |
| 2026-05-12 12:00 |
09:07:03.27 |
+23:18:07.2 |
HIP 44740 |
1.48 |
| 2026-05-13 00:00 |
09:07:16.91 |
+23:18:36.9 |
HIP 44740 |
3.39 |
| 2026-05-13 12:00 |
09:07:30.78 |
+23:19:05.4 |
HIP 44740 |
6.45 |
| 2026-05-14 00:00 |
09:07:44.88 |
+23:19:32.8 |
HIP 44740 |
9.67 |
| 2026-05-14 12:00 |
09:07:59.21 |
+23:19:59.2 |
HIP 44740 |
12.96 |
| 2026-05-15 00:00 |
09:08:13.76 |
+23:20:24.4 |
HIP 44740 |
16.31 |
| 2026-05-15 12:00 |
09:08:28.54 |
+23:20:48.6 |
HIP 44941 |
14.15 |
| 2026-05-16 00:00 |
09:08:43.54 |
+23:21:11.6 |
HIP 44941 |
11.52 |
| 2026-05-16 12:00 |
09:08:58.77 |
+23:21:33.6 |
HIP 44941 |
9.44 |
| 2026-05-17 00:00 |
09:09:14.22 |
+23:21:54.6 |
HIP 44941 |
8.39 |
| 2026-05-17 12:00 |
09:09:29.90 |
+23:22:14.4 |
HIP 44941 |
8.81 |
| 2026-05-18 00:00 |
09:09:45.79 |
+23:22:33.2 |
HIP 44941 |
10.59 |
| 2026-05-18 12:00 |
09:10:01.91 |
+23:22:50.9 |
HIP 44941 |
13.21 |
| 2026-05-19 00:00 |
09:10:18.25 |
+23:23:07.5 |
HIP 44941 |
16.32 |
| 2026-05-19 12:00 |
09:10:34.80 |
+23:23:23.1 |
HIP 44941 |
19.71 |
| 2026-05-20 00:00 |
09:10:51.57 |
+23:23:37.7 |
HIP 44941 |
23.28 |
| 2026-05-20 12:00 |
09:11:08.56 |
+23:23:51.2 |
HIP 44941 |
26.98 |
| 2026-05-21 00:00 |
09:11:25.77 |
+23:24:03.6 |
HIP 44941 |
30.78 |
| 2026-05-21 12:00 |
09:11:43.19 |
+23:24:15.0 |
HIP 44941 |
34.67 |
| 2026-05-22 00:00 |
09:12:00.82 |
+23:24:25.4 |
HIP 44941 |
38.63 |
| 2026-05-22 12:00 |
09:12:18.67 |
+23:24:34.8 |
HIP 45406 |
39.25 |
| 2026-05-23 00:00 |
09:12:36.72 |
+23:24:43.1 |
HIP 45406 |
35.12 |
| 2026-05-23 12:00 |
09:12:54.99 |
+23:24:50.5 |
HIP 45406 |
30.94 |
| 2026-05-24 00:00 |
09:13:13.46 |
+23:24:56.8 |
HIP 45406 |
26.73 |
| 2026-05-24 12:00 |
09:13:32.15 |
+23:25:02.1 |
HIP 45406 |
22.47 |
| 2026-05-25 00:00 |
09:13:51.04 |
+23:25:06.4 |
HIP 45406 |
18.18 |
| 2026-05-25 12:00 |
09:14:10.13 |
+23:25:09.7 |
HIP 45406 |
13.86 |
| 2026-05-26 00:00 |
09:14:29.44 |
+23:25:12.0 |
HIP 45406 |
9.56 |
| 2026-05-26 12:00 |
09:14:48.94 |
+23:25:13.4 |
HIP 45406 |
5.42 |
| 2026-05-27 00:00 |
09:15:08.65 |
+23:25:13.7 |
HIP 45406 |
2.68 |
| 2026-05-27 12:00 |
09:15:28.56 |
+23:25:13.1 |
HIP 45406 |
5.12 |
| 2026-05-28 00:00 |
09:15:48.68 |
+23:25:11.4 |
HIP 45494 |
5.28 |
| 2026-05-28 12:00 |
09:16:08.99 |
+23:25:08.8 |
HIP 45494 |
1.11 |
| 2026-05-29 00:00 |
09:16:29.50 |
+23:25:05.3 |
HIP 45494 |
4.28 |
| 2026-05-29 12:00 |
09:16:50.21 |
+23:25:00.7 |
HIP 45494 |
8.97 |
| 2026-05-30 00:00 |
09:17:11.12 |
+23:24:55.2 |
HIP 45494 |
13.75 |
| 2026-05-30 12:00 |
09:17:32.22 |
+23:24:48.7 |
HIP 45574 |
14.67 |
| 2026-05-31 00:00 |
09:17:53.52 |
+23:24:41.3 |
HIP 45574 |
16.48 |
| 2026-05-31 12:00 |
09:18:15.02 |
+23:24:32.9 |
HIP 45574 |
19.42 |
| 2026-06-01 00:00 |
09:18:36.71 |
+23:24:23.6 |
HIP 45606 |
22.89 |
| 2026-06-01 12:00 |
09:18:58.59 |
+23:24:13.3 |
HIP 45606 |
25.70 |
| 2026-06-02 00:00 |
09:19:20.67 |
+23:24:02.0 |
HIP 45606 |
29.13 |