メタデータ
| 項目 |
値 |
| Designation |
495P/Christensen |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2025-10-24T23:13:34.135680Z |
| Orbit solution date (soln_date, UTC) |
2026-03-07T11:43:25Z |
| Obs used |
115 |
| NEO |
- |
| M1 |
13.200 |
| K1 |
8.250 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2024-09-08T07:05:23.683200Z |
| Discovery magnitude (MPC) |
21.04 G |
| Discovery observatory (MPC) |
G96 · Mt. Lemmon Survey |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2021-04-09.0000000 |
| e |
0.27110379 |
| q (au) |
3.463051 |
| a (au) |
4.751089 |
| i (deg) |
26.355014 |
| Ω (om, deg) |
291.624044 |
| ω (w, deg) |
141.455398 |
| M (ma, deg) |
202.015672 |
等級
散乱 + 全体線形
$$
M_a = (17.943 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
17.943 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.724 |
| k |
0.800 |
| 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
ファインディングチャート
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
05:34:25.74 |
+28:41:18.1 |
HIP 25997 |
28.92 |
| 2026-03-26 12:00 |
05:34:52.87 |
+28:38:47.3 |
HIP 26342 |
31.58 |
| 2026-03-27 00:00 |
05:35:20.18 |
+28:36:17.0 |
HIP 26342 |
29.74 |
| 2026-03-27 12:00 |
05:35:47.66 |
+28:33:47.3 |
HIP 26342 |
29.24 |
| 2026-03-28 00:00 |
05:36:15.31 |
+28:31:18.1 |
HIP 26342 |
30.16 |
| 2026-03-28 12:00 |
05:36:43.13 |
+28:28:49.5 |
HIP 26574 |
29.67 |
| 2026-03-29 00:00 |
05:37:11.11 |
+28:26:21.3 |
HIP 26574 |
23.53 |
| 2026-03-29 12:00 |
05:37:39.26 |
+28:23:53.7 |
HIP 26574 |
17.71 |
| 2026-03-30 00:00 |
05:38:07.56 |
+28:21:26.5 |
HIP 26574 |
12.69 |
| 2026-03-30 12:00 |
05:38:36.03 |
+28:18:59.9 |
HIP 26574 |
9.88 |
| 2026-03-31 00:00 |
05:39:04.65 |
+28:16:33.7 |
HIP 26574 |
11.14 |
| 2026-03-31 12:00 |
05:39:33.43 |
+28:14:07.9 |
HIP 26574 |
15.57 |
| 2026-04-01 00:00 |
05:40:02.37 |
+28:11:42.6 |
HIP 26765 |
14.18 |
| 2026-04-01 12:00 |
05:40:31.46 |
+28:09:17.8 |
HIP 26754 |
7.43 |
| 2026-04-02 00:00 |
05:41:00.70 |
+28:06:53.4 |
HIP 26754 |
0.64 |
| 2026-04-02 12:00 |
05:41:30.09 |
+28:04:29.4 |
HIP 26754 |
6.38 |
| 2026-04-03 00:00 |
05:41:59.63 |
+28:02:05.8 |
HIP 26754 |
13.32 |
| 2026-04-03 12:00 |
05:42:29.32 |
+27:59:42.6 |
HIP 26852 |
14.70 |
| 2026-04-04 00:00 |
05:42:59.15 |
+27:57:19.8 |
HIP 26852 |
16.71 |
| 2026-04-04 12:00 |
05:43:29.13 |
+27:54:57.4 |
HIP 27063 |
15.96 |
| 2026-04-05 00:00 |
05:43:59.26 |
+27:52:35.4 |
HIP 27063 |
9.96 |
| 2026-04-05 12:00 |
05:44:29.52 |
+27:50:13.7 |
HIP 27063 |
6.60 |
| 2026-04-06 00:00 |
05:44:59.92 |
+27:47:52.3 |
HIP 27063 |
9.45 |
| 2026-04-06 12:00 |
05:45:30.47 |
+27:45:31.3 |
HIP 27063 |
15.42 |
| 2026-04-07 00:00 |
05:46:01.15 |
+27:43:10.7 |
HIP 27063 |
22.14 |
| 2026-04-07 12:00 |
05:46:31.97 |
+27:40:50.3 |
HIP 27063 |
29.11 |
| 2026-04-08 00:00 |
05:47:02.92 |
+27:38:30.3 |
HIP 27456 |
28.83 |
| 2026-04-08 12:00 |
05:47:34.00 |
+27:36:10.6 |
HIP 27456 |
21.97 |
| 2026-04-09 00:00 |
05:48:05.22 |
+27:33:51.1 |
HIP 27456 |
15.46 |
| 2026-04-09 12:00 |
05:48:36.57 |
+27:31:32.0 |
HIP 27456 |
10.09 |
| 2026-04-10 00:00 |
05:49:08.05 |
+27:29:13.1 |
HIP 27456 |
8.52 |
| 2026-04-10 12:00 |
05:49:39.66 |
+27:26:54.5 |
HIP 27456 |
12.34 |
| 2026-04-11 00:00 |
05:50:11.40 |
+27:24:36.1 |
HIP 27605 |
8.49 |
| 2026-04-11 12:00 |
05:50:43.26 |
+27:22:18.0 |
HIP 27605 |
8.04 |
| 2026-04-12 00:00 |
05:51:15.25 |
+27:20:00.1 |
HIP 27605 |
12.97 |
| 2026-04-12 12:00 |
05:51:47.36 |
+27:17:42.4 |
HIP 27605 |
19.59 |
| 2026-04-13 00:00 |
05:52:19.59 |
+27:15:24.9 |
HIP 27817 |
16.89 |
| 2026-04-13 12:00 |
05:52:51.95 |
+27:13:07.7 |
HIP 27817 |
11.16 |
| 2026-04-14 00:00 |
05:53:24.42 |
+27:10:50.6 |
HIP 27817 |
8.83 |
| 2026-04-14 12:00 |
05:53:57.02 |
+27:08:33.7 |
HIP 27817 |
12.11 |
| 2026-04-15 00:00 |
05:54:29.73 |
+27:06:17.0 |
HIP 27982 |
16.13 |
| 2026-04-15 12:00 |
05:55:02.55 |
+27:04:00.5 |
HIP 27982 |
16.52 |
| 2026-04-16 00:00 |
05:55:35.49 |
+27:01:44.2 |
HIP 27982 |
20.08 |