메타데이터
| 항목 |
값 |
| Designation |
C/2025 W2 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2025-12-07T20:01:40.048320Z |
| Orbit solution date (soln_date, UTC) |
2026-01-07T15:42:51Z |
| Obs used |
54 |
| NEO |
- |
| M1 |
15.400 |
| K1 |
23.250 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2025-11-28T14:38:51.734400Z |
| Discovery magnitude (MPC) |
19.16 o |
| Discovery observatory (MPC) |
T08 · ATLAS-MLO, Mauna Loa |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2025-12-01.0000000 |
| e |
0.94608895 |
| q (au) |
1.453281 |
| a (au) |
26.957020 |
| i (deg) |
94.710549 |
| Ω (om, deg) |
90.844949 |
| ω (w, deg) |
41.034555 |
| M (ma, deg) |
359.951871 |
밝기
산란 + 전체 선형
$$
M_a = (16.538 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
16.538 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.948 |
| δ90 |
10.000 |
| 파라미터 |
기호 |
범위 |
설명 |
| 태양·지구거리 1 AU에서의 절대등급 |
H0 |
-5 to 20 |
혜성의 고유 밝기 |
| 광도 기울기 파라미터 |
n |
2 to 6 |
태양거리 변화에 따른 밝기 변화율 |
| 전방 산란 비대칭 계수 |
gf |
0.8 to 1 |
전방 산란의 강도 |
| 후방 산란 비대칭 계수 |
gb |
-1 to -0.5 |
후방 산란의 강도 |
| 분할 계수 |
k |
0.8 to 1 |
전·후방 산란 기여도 비율 |
| 먼지/가스 밝기 비 |
δ90 |
1 to 10 |
코마에서 먼지 산란 대비 가스 방출의 상대 기여 |
참고: EPSC-DPS2025-160
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
20:06:48.68 |
+47:01:52.3 |
HIP 99134 |
10.18 |
| 2026-05-12 12:00 |
20:05:51.07 |
+47:03:26.0 |
HIP 99134 |
18.15 |
| 2026-05-13 00:00 |
20:04:52.82 |
+47:04:55.6 |
HIP 98867 |
15.37 |
| 2026-05-13 12:00 |
20:03:53.93 |
+47:06:20.7 |
HIP 98867 |
18.22 |
| 2026-05-14 00:00 |
20:02:54.40 |
+47:07:41.3 |
HIP 98867 |
25.19 |
| 2026-05-14 12:00 |
20:01:54.24 |
+47:08:57.3 |
HIP 98486 |
32.54 |
| 2026-05-15 00:00 |
20:00:53.45 |
+47:10:08.7 |
HIP 98345 |
23.69 |
| 2026-05-15 12:00 |
19:59:52.04 |
+47:11:15.2 |
HIP 98345 |
14.68 |
| 2026-05-16 00:00 |
19:58:50.01 |
+47:12:16.7 |
HIP 98345 |
9.53 |
| 2026-05-16 12:00 |
19:57:47.38 |
+47:13:13.2 |
HIP 98345 |
13.91 |
| 2026-05-17 00:00 |
19:56:44.13 |
+47:14:04.6 |
HIP 98071 |
12.15 |
| 2026-05-17 12:00 |
19:55:40.29 |
+47:14:50.7 |
HIP 98071 |
9.73 |
| 2026-05-18 00:00 |
19:54:35.86 |
+47:15:31.4 |
HIP 97992 |
7.48 |
| 2026-05-18 12:00 |
19:53:30.84 |
+47:16:06.7 |
HIP 97992 |
15.97 |
| 2026-05-19 00:00 |
19:52:25.25 |
+47:16:36.3 |
HIP 97700 |
12.69 |
| 2026-05-19 12:00 |
19:51:19.08 |
+47:17:00.3 |
HIP 97700 |
5.63 |
| 2026-05-20 00:00 |
19:50:12.36 |
+47:17:18.5 |
HIP 97700 |
12.54 |
| 2026-05-20 12:00 |
19:49:05.09 |
+47:17:30.7 |
HIP 97700 |
23.32 |
| 2026-05-21 00:00 |
19:47:57.27 |
+47:17:37.0 |
HIP 97700 |
34.61 |
| 2026-05-21 12:00 |
19:46:48.93 |
+47:17:37.1 |
HIP 97045 |
35.14 |
| 2026-05-22 00:00 |
19:45:40.06 |
+47:17:31.1 |
HIP 97045 |
23.51 |
| 2026-05-22 12:00 |
19:44:30.67 |
+47:17:18.7 |
HIP 97045 |
11.86 |
| 2026-05-23 00:00 |
19:43:20.79 |
+47:17:00.0 |
HIP 97045 |
2.33 |
| 2026-05-23 12:00 |
19:42:10.42 |
+47:16:34.7 |
HIP 96982 |
7.49 |
| 2026-05-24 00:00 |
19:40:59.56 |
+47:16:02.9 |
HIP 96872 |
5.98 |
| 2026-05-24 12:00 |
19:39:48.24 |
+47:15:24.4 |
HIP 96696 |
11.84 |
| 2026-05-25 00:00 |
19:38:36.46 |
+47:14:39.2 |
HIP 96696 |
15.12 |
| 2026-05-25 12:00 |
19:37:24.23 |
+47:13:47.1 |
HIP 96363 |
22.51 |
| 2026-05-26 00:00 |
19:36:11.57 |
+47:12:48.0 |
HIP 96363 |
14.85 |
| 2026-05-26 12:00 |
19:34:58.49 |
+47:11:42.0 |
HIP 96363 |
15.60 |
| 2026-05-27 00:00 |
19:33:45.00 |
+47:10:28.8 |
HIP 96363 |
24.12 |
| 2026-05-27 12:00 |
19:32:31.12 |
+47:09:08.5 |
HIP 96006 |
14.13 |
| 2026-05-28 00:00 |
19:31:16.85 |
+47:07:40.9 |
HIP 96006 |
4.05 |
| 2026-05-28 12:00 |
19:30:02.22 |
+47:06:06.0 |
HIP 95879 |
9.33 |
| 2026-05-29 00:00 |
19:28:47.23 |
+47:04:23.6 |
HIP 95802 |
6.06 |
| 2026-05-29 12:00 |
19:27:31.90 |
+47:02:33.8 |
HIP 95725 |
7.08 |
| 2026-05-30 00:00 |
19:26:16.24 |
+47:00:36.4 |
HIP 95491 |
9.15 |
| 2026-05-30 12:00 |
19:25:00.28 |
+46:58:31.4 |
HIP 95491 |
4.48 |
| 2026-05-31 00:00 |
19:23:44.01 |
+46:56:18.7 |
HIP 95295 |
16.22 |
| 2026-05-31 12:00 |
19:22:27.46 |
+46:53:58.2 |
HIP 95295 |
19.53 |
| 2026-06-01 00:00 |
19:21:10.64 |
+46:51:29.9 |
HIP 94976 |
27.05 |
| 2026-06-01 12:00 |
19:19:53.57 |
+46:48:53.8 |
HIP 94976 |
19.43 |
| 2026-06-02 00:00 |
19:18:36.26 |
+46:46:09.7 |
HIP 94976 |
19.57 |