메타데이터
| 항목 |
값 |
| Designation |
475P/Spacewatch-LINEAR |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2004-09-20T05:48:26.389440Z |
| Orbit solution date (soln_date, UTC) |
2025-06-26T10:13:27Z |
| Obs used |
159 |
| NEO |
- |
| M1 |
7.000 |
| K1 |
15.750 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2023-11-11T05:51:29.030400Z |
| Discovery magnitude (MPC) |
20.80 G |
| Discovery observatory (MPC) |
J04 · ESA Optical Ground Station, Tenerife |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2012-08-10.0000000 |
| e |
0.43983107 |
| q (au) |
4.088003 |
| a (au) |
7.297804 |
| i (deg) |
14.525819 |
| Ω (om, deg) |
147.492673 |
| ω (w, deg) |
40.536988 |
| M (ma, deg) |
144.019928 |
밝기
산란 + 전체 선형
$$
M_a = (6.697 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
6.697 |
| n |
6.000 |
| gf |
0.999 |
| gb |
-1.000 |
| 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) |
| 2026-03-26 00:00 |
18:29:13.23 |
-10:22:02.4 |
HIP 90565 |
10.53 |
| 2026-03-26 12:00 |
18:29:23.37 |
-10:21:04.7 |
HIP 90565 |
11.54 |
| 2026-03-27 00:00 |
18:29:33.34 |
-10:20:07.0 |
HIP 90565 |
12.99 |
| 2026-03-27 12:00 |
18:29:43.14 |
-10:19:09.2 |
HIP 90565 |
14.74 |
| 2026-03-28 00:00 |
18:29:52.77 |
-10:18:11.5 |
HIP 90565 |
16.66 |
| 2026-03-28 12:00 |
18:30:02.22 |
-10:17:13.7 |
HIP 90565 |
18.70 |
| 2026-03-29 00:00 |
18:30:11.50 |
-10:16:15.9 |
HIP 90565 |
20.79 |
| 2026-03-29 12:00 |
18:30:20.61 |
-10:15:18.2 |
HIP 90565 |
22.93 |
| 2026-03-30 00:00 |
18:30:29.54 |
-10:14:20.5 |
HIP 90565 |
25.07 |
| 2026-03-30 12:00 |
18:30:38.31 |
-10:13:22.7 |
HIP 90565 |
27.22 |
| 2026-03-31 00:00 |
18:30:46.89 |
-10:12:25.1 |
HIP 90565 |
29.35 |
| 2026-03-31 12:00 |
18:30:55.30 |
-10:11:27.4 |
HIP 90565 |
31.47 |
| 2026-04-01 00:00 |
18:31:03.54 |
-10:10:29.8 |
HIP 90565 |
33.57 |
| 2026-04-01 12:00 |
18:31:11.60 |
-10:09:32.2 |
HIP 90565 |
35.64 |
| 2026-04-02 00:00 |
18:31:19.48 |
-10:08:34.7 |
HIP 90565 |
37.69 |
| 2026-04-02 12:00 |
18:31:27.19 |
-10:07:37.3 |
HIP 90565 |
39.70 |
| 2026-04-03 00:00 |
18:31:34.72 |
-10:06:39.9 |
HIP 90804 |
41.14 |
| 2026-04-03 12:00 |
18:31:42.08 |
-10:05:42.6 |
HIP 90943 |
41.67 |
| 2026-04-04 00:00 |
18:31:49.25 |
-10:04:45.3 |
HIP 90943 |
41.70 |
| 2026-04-04 12:00 |
18:31:56.25 |
-10:03:48.1 |
HIP 90867 |
41.76 |
| 2026-04-05 00:00 |
18:32:03.07 |
-10:02:51.1 |
HIP 90867 |
40.69 |
| 2026-04-05 12:00 |
18:32:09.71 |
-10:01:54.1 |
HIP 90867 |
39.69 |
| 2026-04-06 00:00 |
18:32:16.17 |
-10:00:57.2 |
HIP 90867 |
38.75 |
| 2026-04-06 12:00 |
18:32:22.44 |
-10:00:00.5 |
HIP 90867 |
37.88 |
| 2026-04-07 00:00 |
18:32:28.54 |
-09:59:03.8 |
HIP 90867 |
37.07 |
| 2026-04-07 12:00 |
18:32:34.46 |
-09:58:07.3 |
HIP 90867 |
36.33 |
| 2026-04-08 00:00 |
18:32:40.20 |
-09:57:10.9 |
HIP 90867 |
35.66 |
| 2026-04-08 12:00 |
18:32:45.75 |
-09:56:14.6 |
HIP 90867 |
35.04 |
| 2026-04-09 00:00 |
18:32:51.13 |
-09:55:18.5 |
HIP 90867 |
34.48 |
| 2026-04-09 12:00 |
18:32:56.32 |
-09:54:22.5 |
HIP 90867 |
33.98 |
| 2026-04-10 00:00 |
18:33:01.33 |
-09:53:26.7 |
HIP 90867 |
33.53 |
| 2026-04-10 12:00 |
18:33:06.15 |
-09:52:31.1 |
HIP 90867 |
33.13 |
| 2026-04-11 00:00 |
18:33:10.80 |
-09:51:35.6 |
HIP 90867 |
32.78 |
| 2026-04-11 12:00 |
18:33:15.25 |
-09:50:40.3 |
HIP 90867 |
32.47 |
| 2026-04-12 00:00 |
18:33:19.53 |
-09:49:45.2 |
HIP 90867 |
32.20 |
| 2026-04-12 12:00 |
18:33:23.62 |
-09:48:50.2 |
HIP 90867 |
31.97 |
| 2026-04-13 00:00 |
18:33:27.52 |
-09:47:55.5 |
HIP 90867 |
31.77 |
| 2026-04-13 12:00 |
18:33:31.24 |
-09:47:01.0 |
HIP 90867 |
31.60 |
| 2026-04-14 00:00 |
18:33:34.78 |
-09:46:06.7 |
HIP 90867 |
31.45 |
| 2026-04-14 12:00 |
18:33:38.13 |
-09:45:12.6 |
HIP 90867 |
31.33 |
| 2026-04-15 00:00 |
18:33:41.29 |
-09:44:18.7 |
HIP 90867 |
31.22 |
| 2026-04-15 12:00 |
18:33:44.27 |
-09:43:25.1 |
HIP 90867 |
31.13 |
| 2026-04-16 00:00 |
18:33:47.06 |
-09:42:31.7 |
HIP 90867 |
31.05 |