메타데이터
| 항목 |
값 |
| Designation |
P/2025 C1 (ATLAS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2025-02-06T12:52:50.154240Z |
| Orbit solution date (soln_date, UTC) |
2025-09-30T13:39:40Z |
| Obs used |
385 |
| NEO |
- |
| M1 |
6.900 |
| K1 |
20.250 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2025-02-02T15:11:23.596800Z |
| Discovery magnitude (MPC) |
18.47 c |
| Discovery observatory (MPC) |
T05 · ATLAS-HKO, Haleakala |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2025-02-27.0000000 |
| e |
0.34537178 |
| q (au) |
2.746051 |
| a (au) |
4.194826 |
| i (deg) |
7.517505 |
| Ω (om, deg) |
9.104185 |
| ω (w, deg) |
186.793260 |
| M (ma, deg) |
2.347518 |
밝기
산란 + 전체 선형
$$
M_a = (8.324 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
8.324 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.997 |
| k |
1.000 |
| 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) |
| 2026-07-29 00:00 |
19:56:07.50 |
-30:27:38.6 |
HIP 98101 |
3.15 |
| 2026-07-29 12:00 |
19:55:45.58 |
-30:28:01.6 |
HIP 98101 |
6.32 |
| 2026-07-30 00:00 |
19:55:23.77 |
-30:28:23.4 |
HIP 98101 |
10.70 |
| 2026-07-30 12:00 |
19:55:02.06 |
-30:28:43.9 |
HIP 98101 |
15.26 |
| 2026-07-31 00:00 |
19:54:40.45 |
-30:29:03.2 |
HIP 97923 |
16.18 |
| 2026-07-31 12:00 |
19:54:18.96 |
-30:29:21.3 |
HIP 97923 |
14.65 |
| 2026-08-01 00:00 |
19:53:57.58 |
-30:29:38.2 |
HIP 97923 |
14.49 |
| 2026-08-01 12:00 |
19:53:36.32 |
-30:29:53.8 |
HIP 97853 |
13.68 |
| 2026-08-02 00:00 |
19:53:15.19 |
-30:30:08.3 |
HIP 97853 |
12.65 |
| 2026-08-02 12:00 |
19:52:54.18 |
-30:30:21.4 |
HIP 97853 |
13.18 |
| 2026-08-03 00:00 |
19:52:33.31 |
-30:30:33.4 |
HIP 97853 |
15.09 |
| 2026-08-03 12:00 |
19:52:12.57 |
-30:30:44.1 |
HIP 97853 |
17.91 |
| 2026-08-04 00:00 |
19:51:51.98 |
-30:30:53.6 |
HIP 97853 |
21.27 |
| 2026-08-04 12:00 |
19:51:31.53 |
-30:31:01.9 |
HIP 97853 |
24.94 |
| 2026-08-05 00:00 |
19:51:11.22 |
-30:31:09.0 |
HIP 97554 |
24.19 |
| 2026-08-05 12:00 |
19:50:51.07 |
-30:31:14.8 |
HIP 97554 |
20.97 |
| 2026-08-06 00:00 |
19:50:31.07 |
-30:31:19.5 |
HIP 97554 |
18.24 |
| 2026-08-06 12:00 |
19:50:11.24 |
-30:31:22.9 |
HIP 97502 |
16.10 |
| 2026-08-07 00:00 |
19:49:51.56 |
-30:31:25.1 |
HIP 97502 |
12.44 |
| 2026-08-07 12:00 |
19:49:32.06 |
-30:31:26.1 |
HIP 97502 |
9.30 |
| 2026-08-08 00:00 |
19:49:12.72 |
-30:31:25.9 |
HIP 97502 |
7.29 |
| 2026-08-08 12:00 |
19:48:53.57 |
-30:31:24.4 |
HIP 97502 |
7.36 |
| 2026-08-09 00:00 |
19:48:34.59 |
-30:31:21.8 |
HIP 97502 |
9.41 |
| 2026-08-09 12:00 |
19:48:15.79 |
-30:31:18.0 |
HIP 97502 |
12.46 |
| 2026-08-10 00:00 |
19:47:57.18 |
-30:31:13.0 |
HIP 97502 |
15.92 |
| 2026-08-10 12:00 |
19:47:38.76 |
-30:31:06.9 |
HIP 97502 |
19.54 |
| 2026-08-11 00:00 |
19:47:20.53 |
-30:30:59.5 |
HIP 97502 |
23.24 |
| 2026-08-11 12:00 |
19:47:02.50 |
-30:30:51.0 |
HIP 97502 |
26.95 |
| 2026-08-12 00:00 |
19:46:44.67 |
-30:30:41.2 |
HIP 97180 |
27.12 |
| 2026-08-12 12:00 |
19:46:27.05 |
-30:30:30.4 |
HIP 97180 |
24.13 |
| 2026-08-13 00:00 |
19:46:09.63 |
-30:30:18.3 |
HIP 97180 |
21.42 |
| 2026-08-13 12:00 |
19:45:52.42 |
-30:30:05.1 |
HIP 97180 |
19.07 |
| 2026-08-14 00:00 |
19:45:35.43 |
-30:29:50.8 |
HIP 97180 |
17.21 |
| 2026-08-14 12:00 |
19:45:18.65 |
-30:29:35.3 |
HIP 97180 |
15.98 |
| 2026-08-15 00:00 |
19:45:02.09 |
-30:29:18.7 |
HIP 97180 |
15.50 |
| 2026-08-15 12:00 |
19:44:45.76 |
-30:29:01.0 |
HIP 97180 |
15.80 |
| 2026-08-16 00:00 |
19:44:29.65 |
-30:28:42.1 |
HIP 97180 |
16.82 |
| 2026-08-16 12:00 |
19:44:13.77 |
-30:28:22.2 |
HIP 97180 |
18.41 |
| 2026-08-17 00:00 |
19:43:58.12 |
-30:28:01.1 |
HIP 96972 |
20.33 |
| 2026-08-17 12:00 |
19:43:42.70 |
-30:27:39.0 |
HIP 96972 |
17.92 |
| 2026-08-18 00:00 |
19:43:27.52 |
-30:27:15.7 |
HIP 96972 |
15.89 |
| 2026-08-18 12:00 |
19:43:12.58 |
-30:26:51.4 |
HIP 96972 |
14.39 |
| 2026-08-19 00:00 |
19:42:57.87 |
-30:26:26.1 |
HIP 96972 |
13.54 |