メタデータ
| 項目 |
値 |
| Designation |
C/2025 W1 (Sankovich) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2025-02-17T17:39:07.554240Z |
| Orbit solution date (soln_date, UTC) |
2025-12-18T15:12:26Z |
| Obs used |
80 |
| NEO |
- |
| M1 |
9.400 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2025-11-20T03:53:37.536000Z |
| Discovery magnitude (MPC) |
19.80 R |
| Discovery observatory (MPC) |
X19 · Santel Observatory, El Leoncito |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2025-11-26.0000000 |
| e |
0.99973624 |
| q (au) |
4.170169 |
| a (au) |
15810.455383 |
| i (deg) |
79.800605 |
| Ω (om, deg) |
95.890663 |
| ω (w, deg) |
250.634842 |
| M (ma, deg) |
0.000139 |
等級
散乱 + 全体線形
$$
M_a = (9.395 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.395 |
| n |
6.000 |
| gf |
0.915 |
| gb |
-0.828 |
| k |
0.806 |
| δ90 |
4.574 |
| 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 |
04:52:09.58 |
-27:45:47.0 |
HIP 22619 |
17.74 |
| 2026-03-26 12:00 |
04:52:23.17 |
-27:39:06.4 |
HIP 22757 |
17.99 |
| 2026-03-27 00:00 |
04:52:36.90 |
-27:32:27.2 |
HIP 22757 |
17.58 |
| 2026-03-27 12:00 |
04:52:50.75 |
-27:25:49.6 |
HIP 22757 |
20.00 |
| 2026-03-28 00:00 |
04:53:04.72 |
-27:19:13.6 |
HIP 22632 |
19.64 |
| 2026-03-28 12:00 |
04:53:18.82 |
-27:12:39.1 |
HIP 22632 |
17.70 |
| 2026-03-29 00:00 |
04:53:33.04 |
-27:06:06.2 |
HIP 22632 |
18.66 |
| 2026-03-29 12:00 |
04:53:47.38 |
-26:59:34.8 |
HIP 22815 |
18.80 |
| 2026-03-30 00:00 |
04:54:01.84 |
-26:53:05.0 |
HIP 22815 |
11.62 |
| 2026-03-30 12:00 |
04:54:16.41 |
-26:46:36.8 |
HIP 22815 |
4.65 |
| 2026-03-31 00:00 |
04:54:31.11 |
-26:40:10.2 |
HIP 22815 |
3.59 |
| 2026-03-31 12:00 |
04:54:45.91 |
-26:33:45.1 |
HIP 22815 |
10.41 |
| 2026-04-01 00:00 |
04:55:00.83 |
-26:27:21.7 |
HIP 22766 |
15.77 |
| 2026-04-01 12:00 |
04:55:15.87 |
-26:20:59.8 |
HIP 22766 |
19.70 |
| 2026-04-02 00:00 |
04:55:31.01 |
-26:14:39.6 |
HIP 22766 |
25.15 |
| 2026-04-02 12:00 |
04:55:46.27 |
-26:08:20.9 |
HIP 22897 |
24.94 |
| 2026-04-03 00:00 |
04:56:01.63 |
-26:02:03.9 |
HIP 22897 |
19.71 |
| 2026-04-03 12:00 |
04:56:17.11 |
-25:55:48.4 |
HIP 22897 |
16.09 |
| 2026-04-04 00:00 |
04:56:32.69 |
-25:49:34.6 |
HIP 22897 |
15.26 |
| 2026-04-04 12:00 |
04:56:48.37 |
-25:43:22.4 |
HIP 22897 |
17.61 |
| 2026-04-05 00:00 |
04:57:04.16 |
-25:37:11.8 |
HIP 22897 |
22.14 |
| 2026-04-05 12:00 |
04:57:20.05 |
-25:31:02.8 |
HIP 23019 |
26.65 |
| 2026-04-06 00:00 |
04:57:36.04 |
-25:24:55.5 |
HIP 23070 |
21.51 |
| 2026-04-06 12:00 |
04:57:52.14 |
-25:18:49.8 |
HIP 23070 |
15.22 |
| 2026-04-07 00:00 |
04:58:08.33 |
-25:12:45.7 |
HIP 23070 |
10.08 |
| 2026-04-07 12:00 |
04:58:24.63 |
-25:06:43.2 |
HIP 23070 |
8.54 |
| 2026-04-08 00:00 |
04:58:41.02 |
-25:00:42.4 |
HIP 23070 |
12.03 |
| 2026-04-08 12:00 |
04:58:57.51 |
-24:54:43.3 |
HIP 23233 |
16.13 |
| 2026-04-09 00:00 |
04:59:14.09 |
-24:48:45.8 |
HIP 23233 |
17.58 |
| 2026-04-09 12:00 |
04:59:30.76 |
-24:42:49.9 |
HIP 23233 |
21.35 |
| 2026-04-10 00:00 |
04:59:47.54 |
-24:36:55.7 |
HIP 23233 |
26.45 |
| 2026-04-10 12:00 |
05:00:04.40 |
-24:31:03.2 |
HIP 23233 |
32.26 |
| 2026-04-11 00:00 |
05:00:21.35 |
-24:25:12.3 |
HIP 23233 |
38.44 |
| 2026-04-11 12:00 |
05:00:38.39 |
-24:19:23.1 |
HIP 23347 |
38.01 |
| 2026-04-12 00:00 |
05:00:55.53 |
-24:13:35.5 |
HIP 23347 |
31.54 |
| 2026-04-12 12:00 |
05:01:12.75 |
-24:07:49.6 |
HIP 23347 |
25.38 |
| 2026-04-13 00:00 |
05:01:30.06 |
-24:02:05.4 |
HIP 23347 |
19.79 |
| 2026-04-13 12:00 |
05:01:47.45 |
-23:56:22.9 |
HIP 23449 |
12.96 |
| 2026-04-14 00:00 |
05:02:04.93 |
-23:50:42.1 |
HIP 23449 |
6.19 |
| 2026-04-14 12:00 |
05:02:22.49 |
-23:45:02.9 |
HIP 23449 |
2.21 |
| 2026-04-15 00:00 |
05:02:40.13 |
-23:39:25.4 |
HIP 23449 |
8.21 |
| 2026-04-15 12:00 |
05:02:57.86 |
-23:33:49.6 |
HIP 23449 |
15.01 |
| 2026-04-16 00:00 |
05:03:15.66 |
-23:28:15.5 |
HIP 23516 |
13.29 |