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
$$
M_a = (9.394 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.394 |
| n |
6.000 |
| gf |
0.936 |
| gb |
-0.828 |
| k |
0.806 |
| δ90 |
4.562 |
| 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) |
| 2026-07-29 00:00 |
06:11:39.48 |
-13:42:45.7 |
HIP 29330 |
10.28 |
| 2026-07-29 12:00 |
06:11:55.68 |
-13:42:17.5 |
HIP 29465 |
9.54 |
| 2026-07-30 00:00 |
06:12:11.81 |
-13:41:50.3 |
HIP 29465 |
6.16 |
| 2026-07-30 12:00 |
06:12:27.85 |
-13:41:24.0 |
HIP 29465 |
4.00 |
| 2026-07-31 00:00 |
06:12:43.80 |
-13:40:58.9 |
HIP 29465 |
4.99 |
| 2026-07-31 12:00 |
06:12:59.68 |
-13:40:34.7 |
HIP 29465 |
8.00 |
| 2026-08-01 00:00 |
06:13:15.47 |
-13:40:11.5 |
HIP 29465 |
11.52 |
| 2026-08-01 12:00 |
06:13:31.17 |
-13:39:49.3 |
HIP 29549 |
11.86 |
| 2026-08-02 00:00 |
06:13:46.79 |
-13:39:28.2 |
HIP 29549 |
11.82 |
| 2026-08-02 12:00 |
06:14:02.32 |
-13:39:08.0 |
HIP 29549 |
12.96 |
| 2026-08-03 00:00 |
06:14:17.76 |
-13:38:48.8 |
HIP 29549 |
14.99 |
| 2026-08-03 12:00 |
06:14:33.12 |
-13:38:30.6 |
HIP 29549 |
17.60 |
| 2026-08-04 00:00 |
06:14:48.39 |
-13:38:13.3 |
HIP 29735 |
14.56 |
| 2026-08-04 12:00 |
06:15:03.56 |
-13:37:57.1 |
HIP 29735 |
11.28 |
| 2026-08-05 00:00 |
06:15:18.65 |
-13:37:41.8 |
HIP 29735 |
8.36 |
| 2026-08-05 12:00 |
06:15:33.65 |
-13:37:27.5 |
HIP 29735 |
6.27 |
| 2026-08-06 00:00 |
06:15:48.55 |
-13:37:14.1 |
HIP 29735 |
5.94 |
| 2026-08-06 12:00 |
06:16:03.37 |
-13:37:01.7 |
HIP 29735 |
7.55 |
| 2026-08-07 00:00 |
06:16:18.09 |
-13:36:50.2 |
HIP 29735 |
10.21 |
| 2026-08-07 12:00 |
06:16:32.71 |
-13:36:39.7 |
HIP 29735 |
13.29 |
| 2026-08-08 00:00 |
06:16:47.25 |
-13:36:30.1 |
HIP 29735 |
16.53 |
| 2026-08-08 12:00 |
06:17:01.68 |
-13:36:21.5 |
HIP 29735 |
19.84 |
| 2026-08-09 00:00 |
06:17:16.02 |
-13:36:13.8 |
HIP 29958 |
22.62 |
| 2026-08-09 12:00 |
06:17:30.26 |
-13:36:07.0 |
HIP 29958 |
20.41 |
| 2026-08-10 00:00 |
06:17:44.41 |
-13:36:01.1 |
HIP 29958 |
18.57 |
| 2026-08-10 12:00 |
06:17:58.45 |
-13:35:56.1 |
HIP 29958 |
17.23 |
| 2026-08-11 00:00 |
06:18:12.40 |
-13:35:52.0 |
HIP 29958 |
16.48 |
| 2026-08-11 12:00 |
06:18:26.24 |
-13:35:48.8 |
HIP 29958 |
16.40 |
| 2026-08-12 00:00 |
06:18:39.99 |
-13:35:46.5 |
HIP 30063 |
14.41 |
| 2026-08-12 12:00 |
06:18:53.63 |
-13:35:45.1 |
HIP 30063 |
11.15 |
| 2026-08-13 00:00 |
06:19:07.17 |
-13:35:44.5 |
HIP 30063 |
7.97 |
| 2026-08-13 12:00 |
06:19:20.60 |
-13:35:44.8 |
HIP 30063 |
4.97 |
| 2026-08-14 00:00 |
06:19:33.93 |
-13:35:46.0 |
HIP 30063 |
2.69 |
| 2026-08-14 12:00 |
06:19:47.15 |
-13:35:48.0 |
HIP 30063 |
3.28 |
| 2026-08-15 00:00 |
06:20:00.27 |
-13:35:50.9 |
HIP 30063 |
5.89 |
| 2026-08-15 12:00 |
06:20:13.28 |
-13:35:54.6 |
HIP 30063 |
8.87 |
| 2026-08-16 00:00 |
06:20:26.19 |
-13:35:59.1 |
HIP 30063 |
11.91 |
| 2026-08-16 12:00 |
06:20:38.98 |
-13:36:04.4 |
HIP 30063 |
14.98 |
| 2026-08-17 00:00 |
06:20:51.67 |
-13:36:10.6 |
HIP 30063 |
18.03 |
| 2026-08-17 12:00 |
06:21:04.24 |
-13:36:17.6 |
HIP 30063 |
21.07 |
| 2026-08-18 00:00 |
06:21:16.71 |
-13:36:25.3 |
HIP 30063 |
24.09 |
| 2026-08-18 12:00 |
06:21:29.07 |
-13:36:33.8 |
HIP 30063 |
27.09 |
| 2026-08-19 00:00 |
06:21:41.31 |
-13:36:43.2 |
HIP 30063 |
30.06 |