メタデータ
| 項目 |
値 |
| Designation |
C/2025 D1 (Groeller) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2028-05-18T10:36:11.433600Z |
| Orbit solution date (soln_date, UTC) |
2026-03-12T13:14:09Z |
| Obs used |
99 |
| NEO |
- |
| M1 |
5.800 |
| K1 |
7.500 |
| 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) |
2024-06-20.0000000 |
| e |
1.00293204 |
| q (au) |
14.122523 |
| a (au) |
-4816.628298 |
| i (deg) |
84.491572 |
| Ω (om, deg) |
312.885337 |
| ω (w, deg) |
185.846213 |
| M (ma, deg) |
-0.004212 |
等級
散乱 + 全体線形
$$
M_a = (4.797 + 3.004\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
4.797 |
| n |
3.004 |
| gf |
0.962 |
| gb |
-0.998 |
| k |
1.000 |
| δ90 |
9.998 |
| 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 |
09:00:04.30 |
+32:31:55.7 |
HIP 44230 |
8.84 |
| 2026-03-26 12:00 |
08:59:57.65 |
+32:31:05.2 |
HIP 44154 |
7.96 |
| 2026-03-27 00:00 |
08:59:51.08 |
+32:30:14.2 |
HIP 44154 |
6.42 |
| 2026-03-27 12:00 |
08:59:44.58 |
+32:29:22.9 |
HIP 44154 |
4.95 |
| 2026-03-28 00:00 |
08:59:38.16 |
+32:28:31.2 |
HIP 44154 |
3.59 |
| 2026-03-28 12:00 |
08:59:31.81 |
+32:27:39.2 |
HIP 44154 |
2.54 |
| 2026-03-29 00:00 |
08:59:25.54 |
+32:26:46.7 |
HIP 44154 |
2.24 |
| 2026-03-29 12:00 |
08:59:19.34 |
+32:25:53.9 |
HIP 44154 |
2.92 |
| 2026-03-30 00:00 |
08:59:13.22 |
+32:25:00.7 |
HIP 44154 |
4.11 |
| 2026-03-30 12:00 |
08:59:07.18 |
+32:24:07.2 |
HIP 44154 |
5.48 |
| 2026-03-31 00:00 |
08:59:01.21 |
+32:23:13.2 |
HIP 44154 |
6.91 |
| 2026-03-31 12:00 |
08:58:55.32 |
+32:22:18.9 |
HIP 44154 |
8.37 |
| 2026-04-01 00:00 |
08:58:49.51 |
+32:21:24.3 |
HIP 44154 |
9.84 |
| 2026-04-01 12:00 |
08:58:43.77 |
+32:20:29.3 |
HIP 44154 |
11.32 |
| 2026-04-02 00:00 |
08:58:38.11 |
+32:19:33.9 |
HIP 44154 |
12.79 |
| 2026-04-02 12:00 |
08:58:32.53 |
+32:18:38.2 |
HIP 44154 |
14.26 |
| 2026-04-03 00:00 |
08:58:27.03 |
+32:17:42.1 |
HIP 44154 |
15.72 |
| 2026-04-03 12:00 |
08:58:21.61 |
+32:16:45.7 |
HIP 43976 |
16.59 |
| 2026-04-04 00:00 |
08:58:16.26 |
+32:15:48.9 |
HIP 43976 |
16.32 |
| 2026-04-04 12:00 |
08:58:11.00 |
+32:14:51.8 |
HIP 43976 |
16.19 |
| 2026-04-05 00:00 |
08:58:05.81 |
+32:13:54.3 |
HIP 43976 |
16.21 |
| 2026-04-05 12:00 |
08:58:00.70 |
+32:12:56.5 |
HIP 43976 |
16.38 |
| 2026-04-06 00:00 |
08:57:55.67 |
+32:11:58.3 |
HIP 43976 |
16.68 |
| 2026-04-06 12:00 |
08:57:50.72 |
+32:10:59.9 |
HIP 43976 |
17.11 |
| 2026-04-07 00:00 |
08:57:45.85 |
+32:10:01.1 |
HIP 43976 |
17.65 |
| 2026-04-07 12:00 |
08:57:41.06 |
+32:09:01.9 |
HIP 43976 |
18.30 |
| 2026-04-08 00:00 |
08:57:36.34 |
+32:08:02.4 |
HIP 43976 |
19.04 |
| 2026-04-08 12:00 |
08:57:31.71 |
+32:07:02.7 |
HIP 43976 |
19.86 |
| 2026-04-09 00:00 |
08:57:27.16 |
+32:06:02.5 |
HIP 43976 |
20.75 |
| 2026-04-09 12:00 |
08:57:22.69 |
+32:05:02.1 |
HIP 43976 |
21.69 |
| 2026-04-10 00:00 |
08:57:18.30 |
+32:04:01.3 |
HIP 43976 |
22.69 |
| 2026-04-10 12:00 |
08:57:13.99 |
+32:03:00.3 |
HIP 43976 |
23.73 |
| 2026-04-11 00:00 |
08:57:09.77 |
+32:01:58.9 |
HIP 43976 |
24.80 |
| 2026-04-11 12:00 |
08:57:05.62 |
+32:00:57.2 |
HIP 43976 |
25.91 |
| 2026-04-12 00:00 |
08:57:01.55 |
+31:59:55.2 |
HIP 43976 |
27.04 |
| 2026-04-12 12:00 |
08:56:57.57 |
+31:58:52.9 |
HIP 44118 |
27.87 |
| 2026-04-13 00:00 |
08:56:53.66 |
+31:57:50.2 |
HIP 43752 |
27.92 |
| 2026-04-13 12:00 |
08:56:49.84 |
+31:56:47.3 |
HIP 43752 |
27.22 |
| 2026-04-14 00:00 |
08:56:46.10 |
+31:55:44.1 |
HIP 43752 |
26.59 |
| 2026-04-14 12:00 |
08:56:42.44 |
+31:54:40.6 |
HIP 43752 |
26.02 |
| 2026-04-15 00:00 |
08:56:38.87 |
+31:53:36.8 |
HIP 43752 |
25.53 |
| 2026-04-15 12:00 |
08:56:35.37 |
+31:52:32.7 |
HIP 43752 |
25.12 |
| 2026-04-16 00:00 |
08:56:31.96 |
+31:51:28.3 |
HIP 43752 |
24.78 |