メタデータ
| 項目 |
値 |
| Designation |
C/2025 D1 (Groeller) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2028-05-18T08:26:24.901440Z |
| Orbit solution date (soln_date, UTC) |
2026-04-08T14:12:15Z |
| Obs used |
183 |
| NEO |
- |
| M1 |
5.300 |
| K1 |
8.000 |
| 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) |
2024-04-23.0000000 |
| e |
1.00293203 |
| q (au) |
14.122734 |
| a (au) |
-4816.715820 |
| i (deg) |
84.497131 |
| Ω (om, deg) |
312.882118 |
| ω (w, deg) |
185.843793 |
| M (ma, deg) |
-0.004382 |
等級
散乱 + 全体線形
$$
M_a = (3.713 + 3.384\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
3.713 |
| n |
3.384 |
| gf |
0.998 |
| gb |
-0.584 |
| 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 |
09:20:32.07 |
+25:22:50.8 |
HIP 45897 |
12.53 |
| 2026-09-20 12:00 |
09:20:37.65 |
+25:21:54.4 |
HIP 45897 |
11.21 |
| 2026-09-21 00:00 |
09:20:43.19 |
+25:20:58.3 |
HIP 45897 |
9.97 |
| 2026-09-21 12:00 |
09:20:48.69 |
+25:20:02.4 |
HIP 45897 |
8.84 |
| 2026-09-22 00:00 |
09:20:54.15 |
+25:19:06.8 |
HIP 45897 |
7.86 |
| 2026-09-22 12:00 |
09:20:59.56 |
+25:18:11.4 |
HIP 45897 |
7.10 |
| 2026-09-23 00:00 |
09:21:04.93 |
+25:17:16.4 |
HIP 45897 |
6.61 |
| 2026-09-23 12:00 |
09:21:10.25 |
+25:16:21.5 |
HIP 45897 |
6.45 |
| 2026-09-24 00:00 |
09:21:15.53 |
+25:15:27.0 |
HIP 45869 |
5.75 |
| 2026-09-24 12:00 |
09:21:20.77 |
+25:14:32.7 |
HIP 45869 |
5.26 |
| 2026-09-25 00:00 |
09:21:25.96 |
+25:13:38.7 |
HIP 45869 |
5.18 |
| 2026-09-25 12:00 |
09:21:31.11 |
+25:12:45.0 |
HIP 45869 |
5.50 |
| 2026-09-26 00:00 |
09:21:36.21 |
+25:11:51.6 |
HIP 45869 |
6.15 |
| 2026-09-26 12:00 |
09:21:41.27 |
+25:10:58.4 |
HIP 45869 |
7.04 |
| 2026-09-27 00:00 |
09:21:46.27 |
+25:10:05.5 |
HIP 45869 |
8.08 |
| 2026-09-27 12:00 |
09:21:51.23 |
+25:09:12.9 |
HIP 45869 |
9.22 |
| 2026-09-28 00:00 |
09:21:56.15 |
+25:08:20.5 |
HIP 45869 |
10.42 |
| 2026-09-28 12:00 |
09:22:01.01 |
+25:07:28.5 |
HIP 45869 |
11.65 |
| 2026-09-29 00:00 |
09:22:05.83 |
+25:06:36.7 |
HIP 45869 |
12.91 |
| 2026-09-29 12:00 |
09:22:10.60 |
+25:05:45.2 |
HIP 45869 |
14.18 |
| 2026-09-30 00:00 |
09:22:15.32 |
+25:04:54.0 |
HIP 45869 |
15.46 |
| 2026-09-30 12:00 |
09:22:19.99 |
+25:04:03.0 |
HIP 45869 |
16.74 |
| 2026-10-01 00:00 |
09:22:24.61 |
+25:03:12.4 |
HIP 46058 |
17.09 |
| 2026-10-01 12:00 |
09:22:29.18 |
+25:02:22.0 |
HIP 46058 |
16.59 |
| 2026-10-02 00:00 |
09:22:33.70 |
+25:01:31.9 |
HIP 46058 |
16.20 |
| 2026-10-02 12:00 |
09:22:38.17 |
+25:00:42.1 |
HIP 46058 |
15.91 |
| 2026-10-03 00:00 |
09:22:42.59 |
+24:59:52.6 |
HIP 46058 |
15.73 |
| 2026-10-03 12:00 |
09:22:46.96 |
+24:59:03.4 |
HIP 46058 |
15.66 |
| 2026-10-04 00:00 |
09:22:51.27 |
+24:58:14.5 |
HIP 46058 |
15.70 |
| 2026-10-04 12:00 |
09:22:55.53 |
+24:57:25.9 |
HIP 46058 |
15.84 |
| 2026-10-05 00:00 |
09:22:59.74 |
+24:56:37.5 |
HIP 46058 |
16.08 |
| 2026-10-05 12:00 |
09:23:03.89 |
+24:55:49.5 |
HIP 46058 |
16.42 |
| 2026-10-06 00:00 |
09:23:07.99 |
+24:55:01.8 |
HIP 46058 |
16.83 |
| 2026-10-06 12:00 |
09:23:12.04 |
+24:54:14.3 |
HIP 46058 |
17.32 |
| 2026-10-07 00:00 |
09:23:16.02 |
+24:53:27.2 |
HIP 46058 |
17.88 |
| 2026-10-07 12:00 |
09:23:19.96 |
+24:52:40.3 |
HIP 46058 |
18.50 |
| 2026-10-08 00:00 |
09:23:23.84 |
+24:51:53.8 |
HIP 46058 |
19.16 |
| 2026-10-08 12:00 |
09:23:27.66 |
+24:51:07.5 |
HIP 46058 |
19.87 |
| 2026-10-09 00:00 |
09:23:31.42 |
+24:50:21.6 |
HIP 46058 |
20.61 |
| 2026-10-09 12:00 |
09:23:35.13 |
+24:49:36.0 |
HIP 46058 |
21.38 |
| 2026-10-10 00:00 |
09:23:38.78 |
+24:48:50.6 |
HIP 46202 |
22.12 |
| 2026-10-10 12:00 |
09:23:42.37 |
+24:48:05.6 |
HIP 46202 |
21.17 |
| 2026-10-11 00:00 |
09:23:45.90 |
+24:47:20.9 |
HIP 46202 |
20.25 |