239P/LINEAR
메타데이터
| 항목 |
값 |
| Designation |
239P/LINEAR |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2019-01-09T23:17:42.864000Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:28:01Z |
| Obs used |
365 |
| NEO |
- |
| M1 |
15.300 |
| K1 |
13.250 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2016-10-04.0000000 |
| e |
0.63143654 |
| q (au) |
1.647599 |
| a (au) |
4.470327 |
| i (deg) |
11.305620 |
| Ω (om, deg) |
255.944518 |
| ω (w, deg) |
220.383718 |
| M (ma, deg) |
273.660407 |
밝기
산란 + 전체 선형
$$
M_a = (18.785 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
18.785 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.656 |
| k |
0.800 |
| 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
잔차 (구간 선형)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 시작일 (UTC) |
끝 (UTC) |
a |
b |
| 2018-10-08 |
2019-01-09 |
+4.7782 |
-0.935 |
| 2019-01-11 |
2019-04-18 |
-10.8877 |
+2.304 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
21:33:33.21 |
-04:50:16.0 |
HIP 106598 |
28.16 |
| 2026-02-03 12:00 |
21:33:53.95 |
-04:48:34.0 |
HIP 106598 |
22.72 |
| 2026-02-04 00:00 |
21:34:14.71 |
-04:46:51.5 |
HIP 106598 |
17.28 |
| 2026-02-04 12:00 |
21:34:35.49 |
-04:45:08.5 |
HIP 106598 |
11.82 |
| 2026-02-05 00:00 |
21:34:56.28 |
-04:43:25.0 |
HIP 106598 |
6.36 |
| 2026-02-05 12:00 |
21:35:17.09 |
-04:41:41.0 |
HIP 106598 |
0.90 |
| 2026-02-06 00:00 |
21:35:37.91 |
-04:39:56.5 |
HIP 106598 |
4.58 |
| 2026-02-06 12:00 |
21:35:58.75 |
-04:38:11.5 |
HIP 106598 |
10.06 |
| 2026-02-07 00:00 |
21:36:19.60 |
-04:36:26.0 |
HIP 106598 |
15.54 |
| 2026-02-07 12:00 |
21:36:40.45 |
-04:34:40.1 |
HIP 106598 |
21.03 |
| 2026-02-08 00:00 |
21:37:01.33 |
-04:32:53.6 |
HIP 106598 |
26.52 |
| 2026-02-08 12:00 |
21:37:22.21 |
-04:31:06.7 |
HIP 106870 |
29.60 |
| 2026-02-09 00:00 |
21:37:43.10 |
-04:29:19.3 |
HIP 106870 |
24.94 |
| 2026-02-09 12:00 |
21:38:04.00 |
-04:27:31.4 |
HIP 106870 |
20.70 |
| 2026-02-10 00:00 |
21:38:24.91 |
-04:25:43.1 |
HIP 106870 |
17.19 |
| 2026-02-10 12:00 |
21:38:45.83 |
-04:23:54.2 |
HIP 106870 |
14.93 |
| 2026-02-11 00:00 |
21:39:06.75 |
-04:22:04.9 |
HIP 106870 |
14.53 |
| 2026-02-11 12:00 |
21:39:27.69 |
-04:20:15.2 |
HIP 106870 |
16.13 |
| 2026-02-12 00:00 |
21:39:48.62 |
-04:18:25.0 |
HIP 106870 |
19.25 |
| 2026-02-12 12:00 |
21:40:09.57 |
-04:16:34.3 |
HIP 106870 |
23.28 |
| 2026-02-13 00:00 |
21:40:30.51 |
-04:14:43.2 |
HIP 107154 |
27.67 |
| 2026-02-13 12:00 |
21:40:51.47 |
-04:12:51.6 |
HIP 107154 |
23.13 |
| 2026-02-14 00:00 |
21:41:12.42 |
-04:10:59.6 |
HIP 107154 |
19.12 |
| 2026-02-14 12:00 |
21:41:33.38 |
-04:09:07.2 |
HIP 107154 |
16.05 |
| 2026-02-15 00:00 |
21:41:54.34 |
-04:07:14.3 |
HIP 107154 |
14.55 |
| 2026-02-15 12:00 |
21:42:15.30 |
-04:05:21.0 |
HIP 107154 |
15.09 |
| 2026-02-16 00:00 |
21:42:36.26 |
-04:03:27.2 |
HIP 107154 |
17.48 |
| 2026-02-16 12:00 |
21:42:57.22 |
-04:01:33.0 |
HIP 107154 |
21.11 |
| 2026-02-17 00:00 |
21:43:18.18 |
-03:59:38.4 |
HIP 107154 |
25.45 |
| 2026-02-17 12:00 |
21:43:39.13 |
-03:57:43.4 |
HIP 107154 |
30.20 |
| 2026-02-18 00:00 |
21:44:00.09 |
-03:55:48.0 |
HIP 107154 |
35.20 |
| 2026-02-18 12:00 |
21:44:21.04 |
-03:53:52.1 |
HIP 107501 |
33.37 |
| 2026-02-19 00:00 |
21:44:41.99 |
-03:51:55.9 |
HIP 107501 |
29.67 |
| 2026-02-19 12:00 |
21:45:02.93 |
-03:49:59.2 |
HIP 107501 |
26.64 |
| 2026-02-20 00:00 |
21:45:23.86 |
-03:48:02.2 |
HIP 107501 |
24.53 |
| 2026-02-20 12:00 |
21:45:44.79 |
-03:46:04.7 |
HIP 107501 |
23.58 |
| 2026-02-21 00:00 |
21:46:05.71 |
-03:44:06.9 |
HIP 107501 |
23.93 |
| 2026-02-21 12:00 |
21:46:26.63 |
-03:42:08.7 |
HIP 107501 |
25.53 |
| 2026-02-22 00:00 |
21:46:47.53 |
-03:40:10.1 |
HIP 107501 |
28.17 |
| 2026-02-22 12:00 |
21:47:08.43 |
-03:38:11.1 |
HIP 107501 |
31.59 |
| 2026-02-23 00:00 |
21:47:29.32 |
-03:36:11.7 |
HIP 107501 |
35.56 |
| 2026-02-23 12:00 |
21:47:50.19 |
-03:34:12.0 |
HIP 107501 |
39.92 |
| 2026-02-24 00:00 |
21:48:11.06 |
-03:32:12.0 |
HIP 107501 |
44.56 |