C/2025 D1 (Groeller)
メタデータ
| 項目 |
値 |
| Designation |
C/2025 D1 (Groeller) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2028-05-18T05:35:13.488000Z |
| Orbit solution date (soln_date, UTC) |
2026-01-07T15:42:41Z |
| Obs used |
76 |
| NEO |
- |
| M1 |
6.600 |
| K1 |
6.750 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2025-02-20T07:52:55.833600Z |
| Discovery magnitude (MPC) |
20.64 G |
| Discovery observatory (MPC) |
V00 · Kitt Peak-Bok |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2023-12-19.0000000 |
| e |
1.00288955 |
| q (au) |
14.123223 |
| a (au) |
-4887.697768 |
| i (deg) |
84.508115 |
| Ω (om, deg) |
312.875234 |
| ω (w, deg) |
185.840010 |
| M (ma, deg) |
-0.004650 |
等級
散乱 + 全体線形
$$
M_a = (3.539 + 3.396\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
3.539 |
| n |
3.396 |
| gf |
1.000 |
| gb |
-0.795 |
| 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) |
| 2026-02-03 00:00 |
09:16:05.77 |
+33:19:50.1 |
HIP 45431 |
15.33 |
| 2026-02-03 12:00 |
09:15:54.97 |
+33:19:43.9 |
HIP 45431 |
14.37 |
| 2026-02-04 00:00 |
09:15:44.16 |
+33:19:37.3 |
HIP 45431 |
13.71 |
| 2026-02-04 12:00 |
09:15:33.35 |
+33:19:30.3 |
HIP 45431 |
13.40 |
| 2026-02-05 00:00 |
09:15:22.54 |
+33:19:23.0 |
HIP 45431 |
13.46 |
| 2026-02-05 12:00 |
09:15:11.73 |
+33:19:15.2 |
HIP 45431 |
13.89 |
| 2026-02-06 00:00 |
09:15:00.92 |
+33:19:07.1 |
HIP 45329 |
13.45 |
| 2026-02-06 12:00 |
09:14:50.11 |
+33:18:58.5 |
HIP 45329 |
12.23 |
| 2026-02-07 00:00 |
09:14:39.31 |
+33:18:49.5 |
HIP 45329 |
11.34 |
| 2026-02-07 12:00 |
09:14:28.50 |
+33:18:40.2 |
HIP 45329 |
10.86 |
| 2026-02-08 00:00 |
09:14:17.70 |
+33:18:30.4 |
HIP 45329 |
10.84 |
| 2026-02-08 12:00 |
09:14:06.91 |
+33:18:20.2 |
HIP 45329 |
11.30 |
| 2026-02-09 00:00 |
09:13:56.12 |
+33:18:09.6 |
HIP 45329 |
12.17 |
| 2026-02-09 12:00 |
09:13:45.34 |
+33:17:58.6 |
HIP 45329 |
13.37 |
| 2026-02-10 00:00 |
09:13:34.56 |
+33:17:47.2 |
HIP 45329 |
14.83 |
| 2026-02-10 12:00 |
09:13:23.80 |
+33:17:35.3 |
HIP 45329 |
16.47 |
| 2026-02-11 00:00 |
09:13:13.05 |
+33:17:23.0 |
HIP 45329 |
18.25 |
| 2026-02-11 12:00 |
09:13:02.30 |
+33:17:10.3 |
HIP 45196 |
19.54 |
| 2026-02-12 00:00 |
09:12:51.57 |
+33:16:57.2 |
HIP 45196 |
19.28 |
| 2026-02-12 12:00 |
09:12:40.85 |
+33:16:43.6 |
HIP 45196 |
19.30 |
| 2026-02-13 00:00 |
09:12:30.15 |
+33:16:29.6 |
HIP 45196 |
19.58 |
| 2026-02-13 12:00 |
09:12:19.46 |
+33:16:15.2 |
HIP 45196 |
20.11 |
| 2026-02-14 00:00 |
09:12:08.79 |
+33:16:00.3 |
HIP 45196 |
20.88 |
| 2026-02-14 12:00 |
09:11:58.13 |
+33:15:45.0 |
HIP 45196 |
21.86 |
| 2026-02-15 00:00 |
09:11:47.50 |
+33:15:29.3 |
HIP 45196 |
23.02 |
| 2026-02-15 12:00 |
09:11:36.88 |
+33:15:13.1 |
HIP 45196 |
24.34 |
| 2026-02-16 00:00 |
09:11:26.28 |
+33:14:56.4 |
HIP 44962 |
24.85 |
| 2026-02-16 12:00 |
09:11:15.70 |
+33:14:39.4 |
HIP 44962 |
22.94 |
| 2026-02-17 00:00 |
09:11:05.15 |
+33:14:21.8 |
HIP 44962 |
21.10 |
| 2026-02-17 12:00 |
09:10:54.61 |
+33:14:03.9 |
HIP 44962 |
19.34 |
| 2026-02-18 00:00 |
09:10:44.11 |
+33:13:45.5 |
HIP 44962 |
17.70 |
| 2026-02-18 12:00 |
09:10:33.62 |
+33:13:26.6 |
HIP 44962 |
16.20 |
| 2026-02-19 00:00 |
09:10:23.17 |
+33:13:07.3 |
HIP 44962 |
14.89 |
| 2026-02-19 12:00 |
09:10:12.74 |
+33:12:47.5 |
HIP 44962 |
13.82 |
| 2026-02-20 00:00 |
09:10:02.33 |
+33:12:27.2 |
HIP 44962 |
13.05 |
| 2026-02-20 12:00 |
09:09:51.96 |
+33:12:06.6 |
HIP 44962 |
12.63 |
| 2026-02-21 00:00 |
09:09:41.62 |
+33:11:45.4 |
HIP 44962 |
12.59 |
| 2026-02-21 12:00 |
09:09:31.30 |
+33:11:23.8 |
HIP 44962 |
12.93 |
| 2026-02-22 00:00 |
09:09:21.02 |
+33:11:01.8 |
HIP 44962 |
13.63 |
| 2026-02-22 12:00 |
09:09:10.78 |
+33:10:39.2 |
HIP 44962 |
14.63 |
| 2026-02-23 00:00 |
09:09:00.56 |
+33:10:16.3 |
HIP 44962 |
15.86 |
| 2026-02-23 12:00 |
09:08:50.38 |
+33:09:52.8 |
HIP 44962 |
17.29 |
| 2026-02-24 00:00 |
09:08:40.24 |
+33:09:28.9 |
HIP 44962 |
18.85 |