249P/LINEAR
메타데이터
| 항목 | 값 |
|---|---|
| Designation | 249P/LINEAR |
| Type | P |
| Perihelion (tp_cal, UTC) | 2015-11-26T18:53:49.649280Z |
| Orbit solution date (soln_date, UTC) | 2023-01-03T10:14:16Z |
| Obs used | 884 |
| NEO | Yes |
| M1 | 18.400 |
| K1 | 4.500 |
| PC | - |
Osculating 궤도요소
| 항목 | 값 |
|---|---|
| Epoch (epoch_cal, TDB) | 2014-07-25.0000000 |
| e | 0.81866843 |
| q (au) | 0.502345 |
| a (au) | 2.770312 |
| i (deg) | 8.399344 |
| Ω (om, deg) | 239.852044 |
| ω (w, deg) | 64.810358 |
| M (ma, deg) | 255.306758 |
밝기
산란 + 전체 선형
$$ M_a = (19.108 + 2.351\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
모델 상수
| 항목 | 값 |
|---|---|
| H0 | 19.108 |
| n | 2.351 |
| gf | 1.000 |
| gb | -0.644 |
| 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 |
|---|---|---|---|
| 2020-01-25 | 2020-06-02 | +14.5622 | -0.412 |
| 2020-06-02 | 2020-08-01 | +43.3682 | +3.425 |
| 2020-08-01 | 2021-01-18 | -1.3785 | +0.228 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
찾아보기
천체력
| Date/Time (UTC) | RA (J2000) | Dec (J2000) | Nearest HIP | Dist from HIP (arcmin) |
|---|---|---|---|---|
| 2026-05-12 00:00 | 06:37:41.12 | +17:30:06.4 | HIP 31635 | 8.04 |
| 2026-05-12 12:00 | 06:38:03.99 | +17:30:01.3 | HIP 31635 | 13.13 |
| 2026-05-13 00:00 | 06:38:26.93 | +17:29:55.6 | HIP 31635 | 18.46 |
| 2026-05-13 12:00 | 06:38:49.96 | +17:29:49.5 | HIP 31857 | 16.43 |
| 2026-05-14 00:00 | 06:39:13.07 | +17:29:42.9 | HIP 31857 | 13.55 |
| 2026-05-14 12:00 | 06:39:36.25 | +17:29:35.8 | HIP 31857 | 12.59 |
| 2026-05-15 00:00 | 06:39:59.51 | +17:29:28.3 | HIP 31950 | 12.34 |
| 2026-05-15 12:00 | 06:40:22.85 | +17:29:20.2 | HIP 31950 | 9.57 |
| 2026-05-16 00:00 | 06:40:46.26 | +17:29:11.6 | HIP 31950 | 9.64 |
| 2026-05-16 12:00 | 06:41:09.74 | +17:29:02.5 | HIP 31950 | 12.53 |
| 2026-05-17 00:00 | 06:41:33.29 | +17:28:52.9 | HIP 32104 | 15.65 |
| 2026-05-17 12:00 | 06:41:56.91 | +17:28:42.8 | HIP 32104 | 11.96 |
| 2026-05-18 00:00 | 06:42:20.61 | +17:28:32.3 | HIP 32104 | 10.23 |
| 2026-05-18 12:00 | 06:42:44.37 | +17:28:21.2 | HIP 32104 | 11.43 |
| 2026-05-19 00:00 | 06:43:08.20 | +17:28:09.6 | HIP 32104 | 14.87 |
| 2026-05-19 12:00 | 06:43:32.10 | +17:27:57.5 | HIP 32104 | 19.42 |
| 2026-05-20 00:00 | 06:43:56.06 | +17:27:44.9 | HIP 32104 | 24.47 |
| 2026-05-20 12:00 | 06:44:20.08 | +17:27:31.8 | HIP 32104 | 29.78 |
| 2026-05-21 00:00 | 06:44:44.17 | +17:27:18.2 | HIP 32465 | 26.47 |
| 2026-05-21 12:00 | 06:45:08.31 | +17:27:04.1 | HIP 32465 | 20.80 |
| 2026-05-22 00:00 | 06:45:32.52 | +17:26:49.5 | HIP 32465 | 15.18 |
| 2026-05-22 12:00 | 06:45:56.79 | +17:26:34.4 | HIP 32465 | 9.74 |
| 2026-05-23 00:00 | 06:46:21.12 | +17:26:18.8 | HIP 32465 | 5.13 |
| 2026-05-23 12:00 | 06:46:45.50 | +17:26:02.7 | HIP 32465 | 5.03 |
| 2026-05-24 00:00 | 06:47:09.94 | +17:25:46.1 | HIP 32465 | 9.60 |
| 2026-05-24 12:00 | 06:47:34.44 | +17:25:29.0 | HIP 32465 | 15.09 |
| 2026-05-25 00:00 | 06:47:58.99 | +17:25:11.3 | HIP 32465 | 20.78 |
| 2026-05-25 12:00 | 06:48:23.59 | +17:24:53.2 | HIP 32514 | 25.34 |
| 2026-05-26 00:00 | 06:48:48.24 | +17:24:34.6 | HIP 32783 | 21.54 |
| 2026-05-26 12:00 | 06:49:12.95 | +17:24:15.5 | HIP 32783 | 16.91 |
| 2026-05-27 00:00 | 06:49:37.71 | +17:23:55.8 | HIP 32783 | 13.34 |
| 2026-05-27 12:00 | 06:50:02.52 | +17:23:35.7 | HIP 32783 | 11.83 |
| 2026-05-28 00:00 | 06:50:27.37 | +17:23:15.1 | HIP 32783 | 13.13 |
| 2026-05-28 12:00 | 06:50:52.28 | +17:22:54.0 | HIP 32783 | 16.61 |
| 2026-05-29 00:00 | 06:51:17.23 | +17:22:32.3 | HIP 32946 | 19.14 |
| 2026-05-29 12:00 | 06:51:42.23 | +17:22:10.2 | HIP 32946 | 18.28 |
| 2026-05-30 00:00 | 06:52:07.27 | +17:21:47.5 | HIP 32946 | 19.33 |
| 2026-05-30 12:00 | 06:52:32.36 | +17:21:24.4 | HIP 32946 | 22.03 |
| 2026-05-31 00:00 | 06:52:57.49 | +17:21:00.8 | HIP 32946 | 25.88 |
| 2026-05-31 12:00 | 06:53:22.66 | +17:20:36.6 | HIP 33203 | 27.46 |
| 2026-06-01 00:00 | 06:53:47.88 | +17:20:12.0 | HIP 33203 | 24.23 |
| 2026-06-01 12:00 | 06:54:13.14 | +17:19:46.8 | HIP 33203 | 22.20 |
| 2026-06-02 00:00 | 06:54:38.44 | +17:19:21.2 | HIP 33230 | 21.07 |